Z-Transmission Displacement Compact Hydrostatic Transmissionpub/@eaton/@hyd/... · EATON Z-Transmission Catalog E-TRCD-CC001-E March 2013 3 Z-Transmission Introduction and Application

Z-TransmissionCompact Hydrostatic Transmission

Displacement 40.6 cm3/r (2.48 in3/r) 49.2 cm3/r (3.0 in3/r)

Peak Pressure 380 bar (5500 psi)

EATON Z-Transmission Catalog E-TRCD-CC001-E March 20132

Z-TransmissionTable of Contents

Introduction and Application Information ........................................................................................................................................ 3

Features and Benefits ................................................................................................................................................................ 4 - 5

Installation Drawings

With 70360 Direct Manual Controlled Pump .................................................................................................................... 6

With 72400 Servo Controlled Pump ................................................................................................................................. 7

Specifications ................................................................................................................................................................................. 8

Model Code ..............................................................................................................................................................................9 - 10

Performance Data ..........................................................................................................................................................................11

Shaft Options .................................................................................................................................................................................12

Port Identification ...........................................................................................................................................................................13

Speed Sensor ................................................................................................................................................................................14

Pump Controls

Manual Control ................................................................................................................................................................15

Hydraulic Remote Control ...............................................................................................................................................15

Electronic Proportional (EP) Control ..........................................................................................................................16 - 17

Pump Control Forces .....................................................................................................................................................................18

Hydraulic System Design Calculation ............................................................................................................................................19

Component Selection ............................................................................................................................................................ 20 - 21

Hydraulic Fluid Recommendations ........................................................................................................................................ 22 - 23

Viscosity Requirements ......................................................................................................................................................... 24 - 25

3EATON Z-Transmission Catalog E-TRCD-CC001-E March 2013

Z-Transmission Introduction and Application Information

Z-Transmission is a compact axial hydrostatic transmission, which utilizes a variable displacement axial piston pump and fixed displacement axial piston motor connected in closed loop system. Oil is circulated by the pump to the motor and then returned directly back to the pump. A charge supply is used to supplement the closed loop system with oil. The charge flow is supplied by an external source.

Operating Principle

The variable displacement piston pump and a fixed displace-ment piston motor are held together with the help of a center manifold. The end covers of the piston pump and motor are replaced by the center manifold. It provides the internal oil passages and connects the inlet port of the motor to the outlet port of pump.

The pump is driven by the prime mover, which generates flow to drive the hydraulic motor. The motor is connected to a gear box. If a fixed pump and fixed motor combination is used it simply acts as a gear box that transmits power from one point to another. A variable pump and fixed motor combina-tion is used to regulate speed and torque.

Pressure is built in the system due to the tractive resistance of vehicle and other auxiliary applications. Direction and rota-tion of the motor depends on the output flow of the pump. Pump flow depends on the speed and displacement of a pump. The displacement of the pump is controlled by the swash plate position.

Advantages System Integration

• Themechanicalcouplingofthevariablepiston pump and motor provides a compact package with fewer leak paths

• Fewerhoseconnectionsreduceassemblytime.

• Asmallenvelopeallowsdesignflexibility.

• Modularconstructioneasesfit-uptoavehicle.

• Noiseandvibrationsarereducedwith“drive-bywire” rather than mechanical linkages.

• Infiniteoutputspeedrangeforgivenenginespeed

• Operatorcomfort

• Ergonomicmachinedesign

Programmable Vehicle Control

• Joystickorfootpedalcommandtransferfunctionsare easily tuned to specifications to provide aggressive or mild vehicle acceleration.

• Dynamichydrostaticbrakingcanbeadjustedtoprovidea more abrupt or a smoother response to operator input.

Optional Control System Upgrades

• Electroniccruisecontrolcanbeaddedtotheelectro-hydraulic Compact Z- Transmission system for greater operator comfort and productivity.

• Programmableanti-stallpreventsenginestalling.

Typical applications

Agriculture

Mid-sized Combine Harvester Compact Tractors

Material Handling

Lift Trucks

Turf care

Small Dozers Trenchers Mowers


Z-Transmission Features and Benefits

Stamped on each unit.A–ProductNumberDescription 77122 = Z-TransmissionB – Rotation R = Right Hand L = Left HandC – Sequential LetterD–DesignCodeNumber

A - Pump Housing • DurableCastIronDesign • MultipleDrainOptionsB - Pump Swash Plate CradleC – Pump Swash PlateD – Input Shaft & Mounting • SAE“B” • NumerousShaftOptionsE – Pump Shaft SealF – Shaft BearingsG – Swash Plate BushingH – Pump Drain PortI – Pump Rotating Group • 40.6cm3/r [2.48 in3/r] Displacement • 49.2cm3/r [3.00 in3/r] DisplacementJ–PumpValvePlateK – High Pressure Relief Valve • PreventsExcessivepressure

L – Centre Manifold • HousesPump&MotorFlowPath • CompactDesign • ReducedPlumbing • ReducedLeakPathsM – PTO ShaftN–MotorDrainPortO - Motor Valve plateP – Motor Rotating Group • 40.6cm3/r [2.48 in3/r] Displacement • 49.2cm3/r [3.00 in3/r] DisplacementQ – Motor Shaft SealR – Output / Motor ShaftS – Motor BearingsT – Motor Housing • Lightweight,AluminumHousingU – Pump Servo Piston AssemblyV – Diagnostic PortsW – Manual Displacement Servo Control ValveX – Charge Pressure Relief ValveY – External Charge Inlet Port

Product Identification Number – Z-Transmission

With 72400 Servo Controlled Pump

Serial Number Code

10 05 06 XXX 1 000

Last Two Digits of Year Built. (10 for 2010 etc.)

Month Built (two digits)

Day Built (two digits)

SpecificNumberofthePump

ShiftNumber

Manufacturing Cell

7 7 1 2 2 – R A A – 0 2

A B C D

V

U

W

D

K

X

Y


4 2

1

34

Z-Transmission Features and Benefits

Z-Transmission with 72400 Servo Controlled Pump

SpecificNumberofthePump

ShiftNumber

Manufacturing Cell

With 70360 Direct Manual-Controlled Piston Pump

1 - Flange2 - Cover Plate3 - Cam Plate Sub-assembly4 - Bearing


With 70360 Direct Manual Controlled Pump - AEY Series

Assemble Motor to Backplatewith Motor Case Drain

Towards Top of Assembly

View E - E9.6

[.38]Motor Case Drain

12.7[.50]

Ø

15.931[.6272]

M12 X 1.75-6H34

[1.34] Min

12.50[.492]Ø

15.931[.6272]

13[.51]Ø

10.4[.41]Ø Pump Case Drain

13[.512]

11.13[.438]

98[3.86]100

[4.37]285.8[11.25]

11.2[.44]

40[1.575]

R

View B - B

4 x Ø Thru

13[.512]Ø Thru

Identification Label

View C - C

C C

Control Shaft Shown at ZeroDisplacement (Neutral)

Control ShaftPosition - a

Control ShaftPosition - b

View D - DScale 2/1

View A - A

38.2[1.53]

14.2[.56]19.8[.78]

102.9[4.05]106

[4.173]

45°

45°

17° 17°

20 Tooth 24/48 DP 30° InvoluteFlat Root Class 6 Side Fit

Spline Per SAE B92.1

B 179.3[7.06]

5.3[.21]

67.8[2.669]

140.9[5.55]

215.5[8.48]

261.5[10.29]

122.74[4.832]

10[.39]60.3[2.38]

17.8[.70]3 X

B A

A

20 Tooth 24/48 DP 30° InvoluteFlat Root Class 6 Side FitSpline Per SAE B92.1

15 Tooth 16/32 DP 30°Involute Flat Root Class 1Side Fit Spline PerSAE J498b

Loop - ASystem Pressure

Diagnostic PortM14 X 1.5 Loop - B

System PressureDiagnostic PortM14 X 1.5

Charge PressureDiagnostic Port

M14 X 1.5

Loop - ARelief Valve

Loop - BRelief Valve

3 X R Shown

Filter Mount1.375 - 12 UNF - 2A

Return from CoolerM22 X 1.5

From Cooler Inlet TeeM22 X 1.5

15.5[.61]

Ø 45[1.77]

Ø 69.1[2.72]

25.4[1.00]Min Full

20[.79]M8 X 1.25-6H Min

19 [.748]

27.7[1.09]

128[5.04]

145[5.71]

87.4[3.44]

91.9[3.62]

79.4[3.13]

115[4.53]

55.6[2.19]

31.5[1.24] 77.7

[3.06]64.4[2.54]

12.7[.50]

224[8.82]

100.97[3.975]

175.6[6.91]

248[9.764]

E E70.1[2.76]

33[1.30]

12.7[.50]

18.54[.73]Ø

23.88[.94]

16.8[.66]

107.2[4.22]

142.7[5.62]

32.3[1.27]

Ø

5.03[.198]R

D

D



View E - E9.6[.38]Motor Case Drain

12.7[.50]

Ø

15.931[.6272]

M12 X 1.75-6H34

[1.34] Min

12.50[.492]Ø

15.931[.6272]

13[.51]Ø


13[.512]

11.13[.438]

98[3.86]100

[4.37]285.8[11.25]

11.2[.44]

40[1.575]

R

View B - B

4 x Ø Thru

13[.512]Ø Thru


View C - C

C C




View D - DScale 2/1

View A - A

38.2[1.53]

14.2[.56]19.8[.78]

102.9[4.05]106

[4.173]

45°

45°

17° 17°



B 179.3[7.06]

5.3[.21]

67.8[2.669]

140.9[5.55]

215.5[8.48]

261.5[10.29]

122.74[4.832]

10[.39]60.3[2.38]

17.8[.70]3 X

B A

A







M14 X 1.5



3 X R Shown




15.5[.61]

Ø 45[1.77]

Ø 69.1[2.72]

25.4[1.00]Min Full

20[.79]M8 X 1.25-6H Min

19 [.748]

27.7[1.09]

128[5.04]

145[5.71]

87.4[3.44]

91.9[3.62]

79.4[3.13]

115[4.53]

55.6[2.19]

31.5[1.24] 77.7

[3.06]64.4[2.54]

12.7[.50]

224[8.82]

100.97[3.975]

175.6[6.91]

248[9.764]

E E70.1[2.76]

33[1.30]

12.7[.50]

18.54[.73]Ø

23.88[.94]

16.8[.66]

107.2[4.22]

142.7[5.62]

32.3[1.27]

Ø

5.03[.198]R

D

D



View E - E9.6

[.38]Motor Case Drain

12.7[.50]

Ø

15.931[.6272]

M12 X 1.75-6H34

[1.34] Min

12.50[.492]Ø

15.931[.6272]

13[.51]Ø


13[.512]

11.13[.438]

98[3.86]100

[4.37]285.8[11.25]

11.2[.44]

40[1.575]

R

View B - B

4 x Ø Thru

13[.512]Ø Thru


View C - C

C C




View D - DScale 2/1

View A - A

38.2[1.53]

14.2[.56]19.8[.78]

102.9[4.05]106

[4.173]

45°

45°

17° 17°



B 179.3[7.06]

5.3[.21]

67.8[2.669]

140.9[5.55]

215.5[8.48]

261.5[10.29]

122.74[4.832]

10[.39]60.3[2.38]

17.8[.70]3 X

B A

A







M14 X 1.5



3 X R Shown




15.5[.61]

Ø 45[1.77]

Ø 69.1[2.72]

25.4[1.00]Min Full

20[.79]M8 X 1.25-6H Min

19 [.748]

27.7[1.09]

128[5.04]

145[5.71]

87.4[3.44]

91.9[3.62]

79.4[3.13]

115[4.53]

55.6[2.19]

31.5[1.24] 77.7

[3.06]64.4[2.54]

12.7[.50]

224[8.82]

100.97[3.975]

175.6[6.91]

248[9.764]

E E70.1[2.76]

33[1.30]

12.7[.50]

18.54[.73]Ø

23.88[.94]

16.8[.66]

107.2[4.22]

142.7[5.62]

32.3[1.27]

Ø

5.03[.198]R

D

D

Z-Transmission Installation Drawings

Dimensions are in millimeters [inches], unless otherwise specified.

R3

R3

R3

PTO Shaft

PTO Shaft

PTO Shaft

Variable Pump

Variable Pump

Variable Pump

R2

R1

T1

T1

C1

R1 - Relief valve for port AR2 - Relief valve for port BR3 - Charge pressure relief valveS1, S2 - Pump servo control portsC1 - External charge inlet portT1 - Diagnostic port for main port AT2 - Diagnostic port for main port BT3 - Diagnostic port for charge flowD1, D2 - Drain port pump (optional)D5 - Drain port motor

T3

T3

T2

Z-Transmission with Servo Manual Control

Z-Transmission with Servo Hydraulic Remote Control (HRC)

Z-Transmission with 360 Direct Manual Control

D1 (Opt.)

D1 (Opt.)

S1(Opt.)

S2(Opt.)

(Opt.)

D2 (Opt.)

D2 (Opt.)

D2 (Opt.)

D1 (Opt.)

D5

T2

C1

T3

C1

D5

T1

T2

D5

FixedMotor

R2

R1

FixedMotor

R2

R1

FixedMotor

S1(Opt.)

S2(Opt.)


With 72400 Servo Controlled Pump - AEZ Series

View C-C

9.6[.38] Motor Case Drain

D

D

A

B

B

A

2 x Ø6.5

[.256]

71[2.80]

36[1.42]

16.5[.65]

6.4[.25]

132.1[5.20]

Loop - A Relief Valve

Loop - B Relief Valve

2X M10 X 1.5-6H 18.5[.73]

Assemble Motor to Backplatewith Motor Case Drain Towards

Top of Assembly

117.3[4.62]

123.4[4.86]

RH (Clockwise) PumpInput Shaft Rotation

Facing Rear of TractorLoop - ASystem PressureDiagnostic PortM14 X 1.5

Loop - BSystem PressureDiagnostic PortM14 X 1.5

20[.79]

View A - A View B - B

37.6[1.48]

Front of Tractor Front of Tractor

View D - DRotated 29°46” CCW

Front of Tractor

Charge PressureInlet PortM22 X 1.5 Per ISO 6149-1

146.6[5.77]

60[2.36]

39[1.54]

125[4.92]

146 [5.748]

40 [1.57]

110 [4.33]105 [4.13]

Motor Output Shaft Rotation

55 [2.17]

12 [.4724]

82[3.2284]

89[3.50]

153[6.02]

6 [.24]

35[1.3780

138[5.43]

70[2.76]

42.8[1.68]40.45[1.593]

88[3.46]

5 X Ø 11 [.434] Thru

Ø

2 X Ø

Pump Case Drain

179.3[7.06]

6.4[.25]

4°Lever

Overstroke

4°LeverOverstroke

28°Lever

Position - a

28°Lever

Position - b

EE

2°30”Neutral

Zone

2°30”NeutralZone

282[11.10]107.5

[4.23]67.8

[2.669]

13 Tooth 16/32 DP30° Involute Flat

Root Class 1 SideFit Spline Per

SAE J498b



Spline Per SAE J498b

Holes Marked Z

6.4[.25]

Ø43.7[1.72]

75[2.95]

70.76[2.786]

24.5[.96]

12.27[.483]

10.024 [.3946]

20.6[.81]

Min Full

31.8[1.25]

50.8[2.00]

12.7[.50]

Ø

View C-C


D

D

A

B

B

A

2 x Ø6.5

[.256]

71[2.80]

36[1.42]

16.5[.65]

6.4[.25]

132.1[5.20]



2X M10 X 1.5-6H 18.5[.73]


Top of Assembly

117.3[4.62]

123.4[4.86]




20[.79]


37.6[1.48]



Front of Tractor


146.6[5.77]

60[2.36]

39[1.54]

125[4.92]

146 [5.748]

40 [1.57]

110 [4.33]105 [4.13]


55 [2.17]

12 [.4724]

82[3.2284]

89[3.50]

153[6.02]

6 [.24]

35[1.3780

138[5.43]

70[2.76]

42.8[1.68]40.45[1.593]

88[3.46]

5 X Ø 11 [.434] Thru

Ø

2 X Ø

Pump Case Drain

179.3[7.06]

6.4[.25]

4°Lever

Overstroke

4°LeverOverstroke

28°Lever

Position - a

28°Lever

Position - b

EE

2°30”Neutral

Zone

2°30”NeutralZone

282[11.10]107.5

[4.23]67.8

[2.669]



SAE J498b




Holes Marked Z

6.4[.25]

Ø43.7[1.72]

75[2.95]

70.76[2.786]

24.5[.96]

12.27[.483]

10.024 [.3946]

20.6[.81]

Min Full

31.8[1.25]

50.8[2.00]

12.7[.50]

Ø

Z-Transmission Installation Drawings

R3

R3

R3

PTO Shaft

PTO Shaft

PTO Shaft

Variable Pump

Variable Pump

Variable Pump

R2

R1

T1

T1

C1


T3

T3

T2




D1 (Opt.)

D1 (Opt.)

S1(Opt.)

S2(Opt.)

(Opt.)

D2 (Opt.)

D2 (Opt.)

D2 (Opt.)

D1 (Opt.)

D5

T2

C1

T3

C1

D5

T1

T2

D5

FixedMotor

R2

R1

FixedMotor

R2

R1

FixedMotor

S1(Opt.)

S2(Opt.)

R3

R3

R3

PTO Shaft

PTO Shaft

PTO Shaft

Variable Pump

Variable Pump

Variable Pump

R2

R1

T1

T1

C1


T3

T3

T2




D1 (Opt.)

D1 (Opt.)

S1(Opt.)

S2(Opt.)

(Opt.)

D2 (Opt.)

D2 (Opt.)

D2 (Opt.)

D1 (Opt.)

D5

T2

C1

T3

C1

D5

T1

T2

D5

FixedMotor

R2

R1

FixedMotor

R2

R1

FixedMotor

S1(Opt.)

S2(Opt.)


View C-C


D

D

A

B

B

A

2 x Ø6.5

[.256]

71[2.80]

36[1.42]

16.5[.65]

6.4[.25]

132.1[5.20]



2X M10 X 1.5-6H 18.5[.73]


Top of Assembly

117.3[4.62]

123.4[4.86]




20[.79]


37.6[1.48]



Front of Tractor


146.6[5.77]

60[2.36]

39[1.54]

125[4.92]

146 [5.748]

40 [1.57]

110 [4.33]105 [4.13]


55 [2.17]

12 [.4724]

82[3.2284]

89[3.50]

153[6.02]

6 [.24]

35[1.3780

138[5.43]

70[2.76]

42.8[1.68]40.45[1.593]

88[3.46]

5 X Ø 11 [.434] Thru

Ø

2 X Ø

Pump Case Drain

179.3[7.06]

6.4[.25]

4°Lever

Overstroke

4°LeverOverstroke

28°Lever

Position - a

28°Lever

Position - b

EE

2°30”Neutral

Zone

2°30”NeutralZone

282[11.10]107.5

[4.23]67.8

[2.669]



SAE J498b




Holes Marked Z

6.4[.25]

Ø43.7[1.72]

75[2.95]

70.76[2.786]

24.5[.96]

12.27[.483]

10.024 [.3946]

20.6[.81]

Min Full

31.8[1.25]

50.8[2.00]

12.7[.50]

Ø

View C-C


D

D

A

B

B

A

2 x Ø6.5

[.256]

71[2.80]

36[1.42]

16.5[.65]

6.4[.25]

132.1[5.20]



2X M10 X 1.5-6H 18.5[.73]


Top of Assembly

117.3[4.62]

123.4[4.86]




20[.79]


37.6[1.48]



Front of Tractor


146.6[5.77]

60[2.36]

39[1.54]

125[4.92]

146 [5.748]

40 [1.57]

110 [4.33]105 [4.13]


55 [2.17]

12 [.4724]

82[3.2284]

89[3.50]

153[6.02]

6 [.24]

35[1.3780

138[5.43]

70[2.76]

42.8[1.68]40.45[1.593]

88[3.46]

5 X Ø 11 [.434] Thru

Ø

2 X Ø

Pump Case Drain

179.3[7.06]

6.4[.25]

4°Lever

Overstroke

4°LeverOverstroke

28°Lever

Position - a

28°Lever

Position - b

EE

2°30”Neutral

Zone

2°30”NeutralZone

282[11.10]107.5

[4.23]67.8

[2.669]



SAE J498b




Holes Marked Z

6.4[.25]

Ø43.7[1.72]

75[2.95]

70.76[2.786]

24.5[.96]

12.27[.483]

10.024 [.3946]

20.6[.81]

Min Full

31.8[1.25]

50.8[2.00]

12.7[.50]

Ø

View C-C


D

D

A

B

B

A

2 x Ø6.5

[.256]

71[2.80]

36[1.42]

16.5[.65]

6.4[.25]

132.1[5.20]



2X M10 X 1.5-6H 18.5[.73]


Top of Assembly

117.3[4.62]

123.4[4.86]




20[.79]


37.6[1.48]



Front of Tractor


146.6[5.77]

60[2.36]

39[1.54]

125[4.92]

146 [5.748]

40 [1.57]

110 [4.33]105 [4.13]


55 [2.17]

12 [.4724]

82[3.2284]

89[3.50]

153[6.02]

6 [.24]

35[1.3780

138[5.43]

70[2.76]

42.8[1.68]40.45[1.593]

88[3.46]

5 X Ø 11 [.434] Thru

Ø

2 X Ø

Pump Case Drain

179.3[7.06]

6.4[.25]

4°Lever

Overstroke

4°LeverOverstroke

28°Lever

Position - a

28°Lever

Position - b

EE

2°30”Neutral

Zone

2°30”NeutralZone

282[11.10]107.5

[4.23]67.8

[2.669]



SAE J498b




Holes Marked Z

6.4[.25]

Ø43.7[1.72]

75[2.95]

70.76[2.786]

24.5[.96]

12.27[.483]

10.024 [.3946]

20.6[.81]

Min Full

31.8[1.25]

50.8[2.00]

12.7[.50]

Ø


Z-Transmission Specifications

Specifications

Two types of Pump control options are available:

• ManualDirect(with70360seriesPump)withfixeddisplacementmotor

• ManualServo(with72400seriesPump)withfixeddisplacementmotor

* Manual Servo Control with additional control features and Solenoid Control are available on request

** Available on request

*** Contact Eaton representative for specific requirements.

† Nominal Pressure: Max. delta system pressure at which component fatigue does not occur (pump life estimated by bearing life).

† † Peak Pressure: Max. operation pressure which is permissible for a short duration of time (t < 1 sec).

Pump Series Motor Series

70360 70360 72400 72400 74318 74328

Displacement – cc/rev (in3/rev) 40.6 (2.48) 49.2 (3.0) 40.6 (2.48) 49.2 (3.0) 40.6 (2.48) 49.2 (3.00)**

Input Mounting Flange – SAE B B B

Max Speed – RPM 3600 3600 3600 3000

NominalPressure-Bar(PSI)† 345(5000) 345(5000) 345(5000)

PeakPressure-Bar(PSI)†† 441(6400) 441(6400) 441(6400)

Controls Direct Manual Manual Servo*, Electronic – Proportional, Hydraulic Remote, Proportional Solenoid*

Additional Features – – Diagnostic ports, – – Cooler bypass valve**, Filter bypass valve**

AtMaxSpeed&NominalPressure – – 59(79) 59(79) Max-Output Power KW (HP) – – 156 (1383) 189 (1672) Max-OutputTorqueNm(lbf-in)

Weight (kg) 52 52

InputShaft-Externalsplines 20T(ANSIB92.1) 15T(SAEJ498b) – –

PTOShaft-Externalsplines 20T(ANSIB92.1) 13T(SAEJ498b) – –

OutputShaft-Externalsplines – – – – 15T(SAEJ498b)

SpeedSensor NotAvailable Available –

Temperature - °C (°F) 107 (225) – 107 (225) – 107 (225) –

Continuous Allowable Case 2 (25) – 2 (25) – 2 (25) – Pressure - Bar (PSI)

External Charge Pump Displacement - 8.2 (0.5) 9.84 (0.6) 8.2 (0.5) 9.84 (0.6) – – cc / rev (in3 / rev) ***

Charge Relief Settings (Range) - 6.89 – 20.68 13.79 – 20.68 – – Bar (PSI) (100 – 300) (200 – 300)


Z-Transmission Model Code

Code Title AEY - Z-Transmission with Direct Manul Controlled Vari-able Displacement Pump AEZ - Z-Transmission with Servo Controlled Variable Displacement Pump

Displacement - Pump 40 - 40.6 cm3/r [2.48 in3/r] 49 - 49.2 cm3/r [3.00 in3/r]

Input Shaft Rotation L - Left Hand Rotation (ccw) R - Right Hand Rotation (cw)

Front Mounting B-2BoltB(SAEJ744-101-2)

Pump Input Shaft A - SAE 15 Tooth 16/32 Ex-ternal, Dia. 24.98 [.984] B - SAE 20 Tooth 24/48 Ex-ternal, Dia. 22.225 [.8750]

PTO (Pump Output) Shaft A - SAE 13 Tooth 16/32 Ex-ternal, Dia. 21.81 [.858], 20.6 [.81] Min. Full Spine B - SAE 20 Tooth 24/48 Ex-ternal, Dia. 22.00 [.866], 5.4 [.21] Min Full Spline

Charge Pump 0-NoChargePump

Charge Relief Setting And Routing 0-NoChargeReliefValve 1 - 17.24-20.68 Bar [250-300 Lbf/In2] Relieved To Case

External Charge Inlet Port 1 - M22X 1.5 PER ISO 6149-1

Drain Port Size And Location - Pump 1-.750-16UNF-2BSAEO-Ring Port - Left (D1), Plugged; Right (D2), Plugged; Thru Drain Into Motor 2 - .750-16 Unf-2B SAE O-Ring Port, Left (D1), Plugged; Right (D2), Plugged; Thru Drain Into Motor

Relief Valve Setting For Main Port A 0 - Check Valve Only A - 103 bar [1500 lbf/in2] B - 120.7 bar [1750 lbf/in2] C - 137.9 bar [2000 lbf/in2] D - 155.1 bar [2250 lbf/in2] E - 172.4 bar [2500 lbf/in2] F - 189.6 bar [2750 lbf/in2] G - 206.8 bar [3000 lbf/in2] H - 224.1 bar [3250 lbf/in2] J - 241.3 bar [3500 lbf/in2] K - 258.6 bar [3750 lbf/in2] L - 275.8 bar [4000 lbf/in2] M - 293.0 bar [4250 lbf/in2] N - 310.3 bar [4500 lbf/in2] P - 327.5 bar [4750 lbf/in2] R - 344.7 bar [5000 lbf/in2] S - 379.2 bar [5500 lbf/in2] T - 413.7 bar [6000 lbf/in2]

Relief Valve Setting for Main Port B 0 - Check Valve Only A - 103 bar [1500 lbf/in2] B - 120.7 bar [1750 lbf/in2] C - 137.9 bar [2000 lbf/in2] D - 155.1 bar [2250 lbf/in2] E - 172.4 bar [2500 lbf/in2] F - 189.6 bar [2750 lbf/in2] G - 206.8 bar [3000 lbf/in2] H - 224.1 bar [3250 lbf/in2] J - 241.3 bar [3500 lbf/in2] K - 258.6 bar [3750 lbf/in2] L - 275.8 bar [4000 lbf/in2] M - 293.0 bar [4250 lbf/in2] N - 310.3 bar [4500 lbf/in2] P - 327.5 bar [4750 lbf/in2] R - 344.7 bar [5000 lbf/in2] S - 379.2 bar [5500 lbf/in2] T - 413.7 bar [6000 lbf/in2]

Special Features (Pump) 0 - NoSpecialFeatures D - Speed Sensor (For AEZ Series)

Pump Control Options DM - Direct Manual Control *M0 - Manual Servo Control, NoAdditionalFeatures *HA - Hydraulic Remote with 5 -15 bar [72-217 lbf/in2] Pilot Pressure Range, 2X .4375-20 UNF-2BSAEO-RingPort *EP - Electronic Proportional Control 12 VDC without elec-tronic driver, with Deutsch connector, with fine hi-gain control metering

* Available only with "AEZ" series.

Destroke Valve 0 - No-DestrokeValve

Control Supply Orifice (p) 0- NoControlSupplyOrifice A - Diameter 0.53 [.021] B - Diameter 0.61 [.024] C - Diameter 0.71 [.028] D - Diameter 0.81 [.032] E - Diameter 0.91 [.036] F - Diameter 1.02 [.040] G - Diameter 1.12 [.044] H - Diameter 1.32 [.052] J - Diameter 1.45 [.057] K - Diameter 1.65 [.065] L - Diameter 1.85 [.073]

Control Supply Orifice (p) 0 - NoControlServoOrifice A - Diameter 0.53 [.021] B - Diameter 0.61 [.024] C - Diameter 0.71 [.028] D - Diameter 0.81 [.032] E - Diameter 0.91 [.036] F - Diameter 1.02 [.040] G - Diameter 1.12 [.044] H - Diameter 1.32 [.052] J - Diameter 1.45 [.057] K - Diameter 1.65 [.065] L - Diameter 1.85 [.073] M - Diameter 0.71 [.028](s1), NoControlServoOrifice(s2) N - Diameter 0.91 [.036](s1), NoControlServoOrifice(s2)

Special Control Options 0 - NoSpecialControlOp-tions

Motor Displacement 40 - 40.6 cm3/r [2.48 in3/r] Fixed Displacement Axial Piston Motor

AEY 40 L B A A 0 1 1 2 M M B M0 0 D D 0 40 A 1 A 0 0A 0 B

1 2 3

6

7

8

9

10

15

19

20

21

22

16

17,18

12

13

14

11

4 5

1,2,3 17,18 23,24 29,304,5 6 7 8 9 10 11 12 13 14 15 19 20 21 22 25 26 27 28 31 3216

23,24


Z-Transmission Model Code

AEY 40 L B A A 0 1 1 2 M M B M0 0 D D 0 40 A 1 A 0 0A 0 B

25

32

31

26

27

28

29,30

1,2,3 17,18 23,24 29,304,5 6 7 8 9 10 11 12 13 14 15 19 20 21 22 25 26 27 28 31 3216

Motor Output Shaft A - SAE 15 Tooth 16/32 Ex-ternal, Dia. 24.98 [.984]

Drain Ports Size and Location (Motor) 1 - Dia 9.6 [.38] Port (D5) -Re-lieved To Reservior / Housing

Special Features (Mo-tor) 0-NoSpecialFeatures

Additional Features 0-NoAdditionalFeatures

Paint 00-DoNotPaint 0A - Red Oxide Primer CD - Blue (Eaton Standard)

Identification 0 - Standard

Design Code B - B


Z-Transmission Performance Data

Thechartsbelowarerepresentativeofa“AEZ”seriesZ-transwith49.2cm3/r [3.00 in3/r] servo variable pump and 40.6 cm3/r [2.48 in3/r] fixed mo-tor. The tests were run at an oil temperature of 82°C [180°F] with viscosity at 9 - 12 cSt [54 - 66 SUS].


Pump Input Shaft

Code Position 8

Selection - A 15T

Max.inputtorque338N-m[2987lbf-in]

Selection - B 20T

Max.inputtorque243N-m[2151lbf-in]


Power Take Off (PTO) Shaft

Code Position 9

Selection - A 13T

Max.outputtorque-210N-m[1859lbf-in]

Selection - B 20T

Max.outputtorque-243N-m[2151lbf-in]

Motor Output Shaft

Code Position 25

Selection - A 15T

Max.outputtorque–338N-m[2991lbf-in]

24,4[.96]

22,23 [.875] Dia., 41 Tooth 48/96 DP 45 InvoluteFillet Root, Class 1Side Fit Spline

41,1[1.62]

22,22 [.875] Dia., 13 Tooth 16/32 DP 30 Involute Fillet Root, Class 1Side Fit Spline, SAE J498b

46[1.81]

6.4 [.25] Wx 28.4 [1.12]Lg. Key

28,22/27,97 [1.111/1.101]

25,400/25,387[1.0000/.9995] Dia.

3 [.12]

24,981 [.9835] Dia., 15 Tooth 16/32 DP 30 Involute Flat Root, Class 1Side Fit Spline, SAE J498b

46[1.81]

Maximum Input Torque338 N.m[2987 lbf.in]

Used for Tandem connection only


35,1[1.38]

24,18/23,42[.952/.922]

19,8[.78]

3,33/3,18[.131/.125]

25,43/25,37 Dia.[1.001/.999]

3/8 - 24UNF-2B19 [.75] Deep

38,15/38,05 taper per 304,8 mm

[1.502/1.498taper per foot]

6,4 [.25] x19,8 [.78]

Keyway




41,1[1.62]

6,4 [.25] x 24,6 [.97]Keyway

22,23/22,20 Dia.[.875/.874]

25,06/24,82 Dia.[.987/.977]

3 [.12]


20 Tooth 24/48 DP 30º InvoluteFalt Root, Calss 6Side Fit Spline Per ANSI B92.1

20 Tooth 24/48 DP 30° InvoluteFlat Root Class 6 Side FitSpline Per ANSI B92.1

69.1[2.72]

5.3[.21]

25.4[1.00]

Min FullSplines

Ø

13 Tooth 16/32 DP 30° InvoluteFlat Root Class 1 Side FitSpline Per SAE J498b


43.7[1.72]

20.6[.81]

6.4 [.25]

46[1.81]

Min FullSplines

Min FullSplines

Ø



43.7[1.72]

20.6[.81]

6.4 [.25]

46[1.81]

Min FullSplines

Min FullSplines

Ø

Z-Transmission Shaft Options


Z-Transmission Catalog Port Identification

Pump Drain Port- (D2)Right Side

1 1/16 UN-2BSAE O-Ring Port

Detail A

Pump Drain Port- (D2) 9.6 [.38]

Assemble motor to back platewith motor drain port towardtop of the assembly

Detail A

External ChargeInlet Port- (C1)M22X 1.5


Diagnostic PortM14X 1.5

Loop - BSystem Pressure

Diagnostic PortM14X 1.5

94.69[3.728]

198.88[7.83]

11.94[0.47]

30

127.

23[5

.009

]

123.33[4.855]

151.31[5.957]

72.3

8[2

.849

]

48.6

5[1

.915

]

94.74[3.73]

Mating Connector

128.78[5.07]

115.

16[4

.534

]



Z-TransmissionSpeed Sensor Code Position 16, Selection D

Mating Packard Connector

Connector Body – 1216 2192 Connector Seal – 1204 0750 Cable Seal – 1204 0751 Socket – 1212 4075

Optional Mating Connectors

Connector Assembly (Body, Cable Seal, Seal) – 1216 2193 Socket (16 – 18 AWG) – 1212 4075 Socket (20 – 22 AWG) – 1212 4076

115.

16[4

.534

]

128.78[5.07]

Mating Connector

Parameter Condition Value

Operating Temperature Limit -40 to 150°C [-40 to 302° F ]

Sensor Resistance 25°C (77° F) 1.5 K To 3.5 K Ohms

Sensor Inductance 25°C (77° F) 0.6 to 3.7 H

Output Voltage 25°C (77° F) 9.3 Hz @ 2.29mm [.090 inch] Gap 400 mVpp Min 300 Hz @ 0.25mm [.010 inch] Gap 80 Vpp Max.

Air Gaps 0.26 to 2.28 [ .010 to .090 ] mm [inch]

Vibration Voltage 15G random Vibration 0.4V P-P Max



PumpTop View

PumpEnd View

122,2 [4.81]to face of pump flange.

16,5 [.65]

92,7[3.65]

153,9[6.06]

103,9[4.09]

Center Line ofShaft

Neutral Lockout Switch*5 amp. @ 12 VDC, 3 amp. @ 24 VDC

DestrokeValve*

Weather Pack Connector provided on solenoid:Body #12010973 (black)Terminal #12033674 (2)Seal #12010293 (2)

37,1[1.46]

57,2[2.25]

NeutralDetent*

27,9[1.10]

39,9[1.57]

Mating connector must meet DIN 43650 specfication such as Hirschman connector #931-236-100 with seal #731-531-002, or equivalent. Eaton P/N 103330-XXX

Solenoid1.2 amp @12 VDC.6 amp. @ 24 VDC

Weather Pack Mating Connector Required:Body #12015792 (black)*Terminal #12089188 (2)*Seal #12010293 (2)

*May vary due to wire gauge used.

Lever Position "A"

Lever Position "B"

0 Neutral Zone

Neutral Zone To Full CamTo Full Cam

Maximum Over TravelMaximum Over Travel

*Neutral Detent Feature

The neutral detent provides a positive, centered feeling to the handle, signaling the operator when the pump is in neutral position.

Z-Transmission - Pump Controls Manual Control Code Position 17, 18 Selection M0

Control Lever Travel Standard Band Wide Band

NeutralZone 2.5° 4.0°

Maximum Displacement 25.5° 25.5°

Maximum Over Travel 4.0° 2.5°

Hydraulic Remote Control Conversion Kit

OrderPartNumber72400-919Includes:Controlsub-assembly(1pc),Socket head cap screws (6 pc), Control housing gasket (1pc)

NOTE

1. Right Hand (Clockwise) Rotation Pilot Press Port -1 Pressurized...flow From System Press Port -B Pilot Press Port -2 Pressurized...flow From System Press Port -A

Left Hand (Counter Clockwise) Rotation Pilot Press Port -1 Pressurized...flow From System Press Port -A Pilot Press Port -2 Pressurized...flow From System Press Port -B

2.NominalThresholdPressure............5bar[72.5PSI] NominalMaxDisplacementPressure.....15bar[217.6PSI]

* Do not touch any of the Control adjustment nuts which are factory set.

39,3[1.55]

141,3[5.56]

Centerline Of Drive Shaft

Front Flange of 72400 Unit

36,9[1.45]

58,3[2.30]

78,7[3.08]

114,6 [4.51]Approximate

122,5[4.82]

Pilot Pressure Port (s1)7/16-20 UNF-2B SAE O-ringPort Accepts Fitting For SAE J1926 Pilot Pressure Port (s2)

7/16-20 UNF-2B SAE O-ringPort Accepts Fitting For SAE J1926

57,2[2.25]

2X 120,4[4.74]

B

AR1

R2R3

s2(Opt.)

s1(Opt.)

s2Hydraulic Remote

Control

s1

C2P

D2

D3

C1

SD1

*

R3

R3

R3

PTO Shaft

PTO Shaft

PTO Shaft

Variable Pump

Variable Pump

Variable Pump

R2

R1

T1

T1

C1


T3

T3

T2




D1 (Opt.)

D1 (Opt.)

S1(Opt.)

S2(Opt.)

(Opt.)

D2 (Opt.)

D2 (Opt.)

D2 (Opt.)

D1 (Opt.)

D5

T2

C1

T3

C1

D5

T1

T2

D5

FixedMotor

R2

R1

FixedMotor

R2

R1

FixedMotor

S1(Opt.)

S2(Opt.)

R3

R3

R3

PTO Shaft

PTO Shaft

PTO Shaft

Variable Pump

Variable Pump

Variable Pump

R2

R1

T1

T1

C1


T3

T3

T2




D1 (Opt.)

D1 (Opt.)

S1(Opt.)

S2(Opt.)

(Opt.)

D2 (Opt.)

D2 (Opt.)

D2 (Opt.)

D1 (Opt.)

D5

T2

C1

T3

C1

D5

T1

T2

D5

FixedMotor

R2

R1

FixedMotor

R2

R1

FixedMotor

S1(Opt.)

S2(Opt.)

Hydraulic Remote Control Code Position 17, 18 Selection HA


The Electronic Proportional (EP) displacement control is ideal for applications requiring electronic pump displacement control. The EP displacement control provides the flexibil-ity of three command input choices. Control components include a proportional solenoid actuated valve assembly and an electronic solenoid driver module mounted on the pump.

The control driver module converts a command input signal to a proportional current output to the proportional solenoids resulting in a proportional pump displacement.

The EP displacement control has been designed to withstand the rigors of off-highway equipment environmental condi-tions.

EP Displacement Control Features

• Ease of installation

• Automotive style environmentally sealed Metri-Pack con-nectors

• Operates from 12 or 24 Vdc power supply

• External fuse (customer supplied): 3A for 12 Vdc system, 1A for 24 Vdc system

• Three choices for command input signal

• Operating temperature range -40° C to +85° C

• Control driver module encapsulated for environmental protection

• Closed loop current control compensates for resistance change of the proportional solenoids due to temperature variations

• Return to neutral for loss of power, or loss of command input signal

• Mechanical feedback of swashplate position for closed loop control

• Externalneutraladjustment

• Manual override capability

• ControldrivemodulequalificationperSAEJ1455,SAEJ1113,CISPR25

• SAEJ1455-RecommendedEnvironmentalPracticesforElectronic Equipment Design

• Humidity/Temperature Extreme Cycling

• Salt Spray

• Splash & Immersion

• Steam Cleaning/High Pressure Wash

• Vibration

• Mechanical Shock

• Temperature Cycling

• Load Dump Transients

• Inductive Load Switching Transients

• SAEJ1113-ElectromagneticSusceptibilityMeasurementProcedures for Vehicle Components

• EMI/EMC - Conducted & Radiated Immunity

• CISPR25-InternationalElectrotechnicalCommission“Lim-its and Methods of Measurement of Radio Disturbance Characteristics for the Protection of Receivers used on BoardVehicles”.

• EMI /EMC - Conducted & Radiated Emissions

Z-Transmission - Pump ControlsElectronic Proportional Displacement ControlCode Position 17,18 Selection EP

Proportional Solenoid #2

ProportionalSolenoid #1

Feedback LinkPs1 s2

A

B

Power SupplyConnector*

Note: Customer supplies: 1A fuse for 24Vdc system 2A fuse for 12Vdc system

Solenoid ActuatedValve Assembly

Control

Driver

ModuleProportional Solenoid 1

Proportional Solenoid 2

S1S2

P

MechanicalSwashplateFeedback

A

B

C

Command InputSignal Connector**

EC and ED code options do not include electronic solenoid driver.

Proportional Solenoid #2


Feedback LinkPs1 s2

A

B

Power SupplyConnector*

Note: Customer supplies: 1A fuse for 24Vdc system 2A fuse for 12Vdc system

Solenoid ActuatedValve Assembly

Control

Driver

ModuleProportional Solenoid 1

Proportional Solenoid 2

S1S2

P

MechanicalSwashplateFeedback

A

B

C

Command InputSignal Connector**

EC and ED code options do not include electronic solenoid driver.

Solenoid Actuated Valve Assembly


Z-Transmission - Pump ControlsElectronic Proportional Displacement ControlCode Position 17,18 Selection EP

A

Operating Range

B C D E

Neutral RangeOperating Range

B Port Flow 100%

CCW Pump Rotation

Command Signal input

A Port Flow 100%

CCW Rotation Pump

% P

ump

Out

put F

low

General Relationship between Command Signal Input and Pump Flow

73,7[2.90] 112,6

[4.43] 131,3[5.17]

165,1[6.50]

154,9[6.10]

139,6[5.50]

90,7[3.57]

167,2[6.58]

Neutral Adjustment

Front Mounting Flange Surface

Power Supply

Command Input Signal

2X Manual Overide, Push to activate manual override.

Centerline of drive shaft



Note: In order to assure the most reliable installation and operation of any electronic control, proper installation meth-ods should be followed with respect to interconnection wiring harness, command signal devices, fusing, and input power switching. Proper care should be taken to prevent damage to all electrical and electronic components due to abrasion, movingobjects,heat,moistureorotherenvironmentalhazards. For safety critical applications, Eaton recommends that a switch be installed in line with (+ Battery) power to the module so that power may quickly be disconnected in case of emergency. A 2 ampere slow blow fuse should always be installed in the + battery line. It is recommended that during initialstart-upandcheckout,themachinebeplacedonjackstands to prevent inadvertent movement of the machine.

PWM Configuration Closed loop current control of the solenoid current via PWM duty-cycle variation. Note: Coil currents must be limited to not exceed solenoid coil specifications Frequency: 70-200Hz (100Hz recommended when PWM driver does not have built-in dither capabilities)

Dither Signal The design must provide for a separate dither signal to be added to the input command. Waveform: Square Frequency: 75 (+ 25,-15) Hz Amplitude: .250 +.100 -.050A pk-pk

Electronic Proportional Valve Control Guidelines

Signal Profile

*Note: The +20 mA command input signal configuration operates the pumps in one direction. The customer has to change the polarity on the -20 mA signal to operate the pump in the opposite direction.

Command Input

Signal( A max) B (min) C D (min) E

1 to 6 Vdc 1.5 Vdc 3.3 Vdc 3.5 Vdc 3.7 Vdc 5.5 Vdc

4-20 mA* -20 mA -4.5 mA 0 mA +4.5 mA +20 mA

±100 mA -100 mA -7.5 mA 0 mA +7.5 mA +100 mA

Parameter 12 VDC 24 VDC

Signal Input * Resistance at 25°C - Ohm 5.19 ± 10% 20.80 ± 10% NominalInductance 17.5mH 27.7mH Current(I)atNeutral-Amp <0.4 <0.2 Current (I) at Full Displacement – Amp (max continuous) 1.5A 0.75AOperating Limits Temperature Ratings -65°F Min to 140°F Max Power Consumption 28W Max*Coils have no internal diodes, polarity does not affect performance.


For 70360 Direct Manual Controlled Pump

Z-TransmissionPump Control Forces


Z-TransmissionHydraulic System Design Calculations

4 EATON Vickers PVH Industrial and Mobile Variable Displacement Piston Pumps V-PUPI-TM008-E February 2009

Hydraulic System Design Calculations

Basic Formulas

Output Flow (Q)

lpm = gpm =

Input Power (P)

kW = hp =

Shaft Torque (M)

N-m = lb-in =

Shaft Speed (n)

rpm = RPM =

Output Power (P)

kW = hp =

Volumetric Displacement

cm3/r = in3/r =

Basic Formulasbar = 10 Newtons/cm2

gpm = gallons per minute

hp = horsepower

lb-in = pound inch

lb-ft = pound feet

kW = kilowatt

kgf = kilograms force

l/min = liters per minute

N-m = Newton meters

psi = pounds per square inch

rpm = revolutions per minute

EfficienciesVolumetric Nv =

Mechanical Nm =

Total Nt = Nv x Nm

Commonly Used ConversionsTo Convert Into Multiply by

bar psi 14.5

cm3 in3 0.06102

˚C ˚F (˚C x 1.8) +32

gallons (US) liters 3.785

kg lbs 2.205

kgf/cm2 psi 14.2

kW hp 1.341

liters US Gallons 0.2642

mm inches 0.03937

N-m lb-in 8.85

N-m lb-ft 0.7375

˚F ˚C (˚F-32)/1.8

hp kW 0.7457

inch mm 2.54

in3 cm3 16.39

lb-in N-m 0.113

lb-ft N-m 1.356

lbs kg 0.4535

psi bar 0.06896

psi kgf/cm2 .070307

Note: Performance charts can be found on subsequent pages.

cm3/r x rpm in3/r x rpm

1000 231

l/min x bar gpm x psi

600 1714

bar x cm3/r psi x in3/r

62.8 6.28

1000 x 1/min 231 x gpm

cm3/r in3/r

N-m x RPM lb-in x rpm

9549 63,025

lpm x 1000 gpm x 231

rpm rpm

PM

n

Q

p

gpm actual

gpm theorectical

lb-in actual

lb-in theorectical


Z-Transmission Component Selection

The long service life of Eaton hydrostatic transmissions is largely dependent on the proper selection and installation of the components necessary for transmission operation.

The following components are necessary for transmission operation:

1. Variable Displacement Pump

2. Fixed or Variable Displacement Motor

3. Reservoir

4. Filter

5. Charge Pump Inlet Line

6. Pump and Motor Case Drain Lines

7. High Pressure Lines

8. Heat Exchanger

9. Heat Exchanger Bypass Valve

10. Reservoir Return Line

Variable Displacement Pump

Eaton hydrostatic variable displacement pumps are an axial piston design. They are equipped with standard SAE mounts, shafts and port connections.

Fixed or Variable Displacement Motor

Eaton hydrostatic motors are an axial piston design. They are equipped with standard SAE mounts, shafts and port connec-tions.

Reservoir

The reservoir is an important part of the hydrostatic transmis-sion system. It should provide adequate oil storage and allow easy oil maintenance.

The reservoir must hold enough oil to provide a continuous oil supply to the charge pump inlet. It must also have enough room for the hydraulic oil to expand as the system warms up. Consider charge pump flow when sizing the reservoir: One half (.5) minute times (X) the maximum charge pump flow should be the minimum oil volume in the reservoir. Maintain-ing this oil volume will give the oil a minimum of thirty (30) seconds in the reservoir. This will allow any entrained air to escape and contamination to settle out of the oil.

To allow for oil expansion, the reservoir’s total volume should be at least six tenths (.6) minute times (X) the maximum charge pump flow.

The reservoir’s internal structure should cut down turbulence and prevent oil aeration.

The line returning flow to the reservoir should be fitted with a diffuser to slow the incoming oil to 1 to 1.2 meters [3-4 feet] per second to help reduce turbulence. The return flow line should also be positioned so that returning oil enters the reservoir below the liquid surface. This will help reduce aera-tion and foaming of the oil. The reservoir should have baffles between the return line and suction line. Baffles prevent return flow from immediately reentering the pump.

A sixty mesh screen placed across the suction chamber of the reservoir will act as a bubble separator. The screen should be placed at a 30° angle to the horizon. The entrance to the suction line should be located well below the fluid surface so there is no chance of air being drawn into the charge pump in-let. However, the suction line entrance should not be located on the bottom of the reservoir where there may be a buildup of sediment. The suction line entrance should be flared and covered with a screen.

The reservoir should be easily accessible. The fill port should be designed to minimize the possibility of contamination during filling and to help prevent over filling. There should be a drain plug at the lowest point of the reservoir and it should also have a clean-out and inspection cover so the reservoir can be thoroughly cleaned after prolonged use. A vented res-ervoir should have a breather cap with a micronic filter.

Sealed reservoirs must be used at altitudes above 2500 feet.

These reservoirs should be fitted with a two- way micronic fil-ter pressure cap to allow for fluid expansion and contraction.

In both cases the caps must be designed to prevent water from entering the reservoir during bad weather or machine washing.

A hydrostatic transmission with a well designed reservoir will run quieter, stay cleaner and last longer.

Charge Pump Inlet Line

The inlet line to the charge pump should be large enough to keep the pressure drop between the reservoir and charge pump inlet within the limits described in the filter section. Fit-tings will increase the pressure drop, so their number should be kept to a minimum. It is best to keep fluid velocities below 1,25 meters [4 feet] per second.

Fluid and temperature compatibility must be considered when selecting the inlet line.

Pump and Motor Case Drain

The case drain lines should be large enough to limit the pump and motor case pressures (Medium Duty to 2 bar [25 PSI]) at normal operating temperatures. Fluid and temperature com-patibility must also be considered when selecting the case drain lines.

Heat Exchanger

Use of a heat exchanger is dependent on the transmission’s duty cycle and on machine layout. The normal continuous operating fluid temperature measured in the pump and motor cases should not exceed 80½ºC [180½ºF] for most hydraulic fluids. The maximum fluid temperature should not exceed 107½ºC [225½ºF].

The heat exchanger should be sized to dissipate 25% of the maximum input power available to the transmission. It must also be sized to prevent the case pressures in the pump and motor from getting too high. Medium duty case pressure up to 2 bar [25 psi], at normal operating temperatures, are ac-ceptable.


Z-Transmission Component Selection

Heat Exchanger Bypass Valve

The heat exchanger bypass valve is a pressure and/or tem-perature valve in parallel with the heat exchanger. Its purpose is to prevent case pressures from getting too high. The heat exchanger bypass valve opens when the oil is thick, espe-cially during cold starts.

Reservoir Return Line

The same general requirements that apply to case drain lines apply to the reservoir return line.

Startup Requirements

The mounting orientation of pumps and motors is unrestrict-ed provided the case drain of the pump and motor remain full.

Position the case drain such that it assures an oil level at or above unit center line at start-up. The case drain line that car-ries the flow leaving the pump or motor should be connected to the highest drain port on each of the units. This assures that the pump and motor cases remain full.

The combined torque required to turn two or more pumps must not exceed the torque rating of the input drive shaft of the front piston pump.

Installer to provide centering and a secure neutral for pump swash plate control shaft.

An external support is recommended for all tandems


Z-TransmissionHydraulic Fluid Recommendations

Introduction

Oil in hydraulic system performs the dual function of lubri-cation and transmission of power. It is a vital element in a hydraulic system, and careful selection should be made with the assistance of a reputable supplier. Proper selection of oil assures satisfactory life and operation of system compo-nents, especially hydraulic pumps and motors. Generally, oil selected for use with pumps and motors is acceptable for use with valves. Critical servo valves may need special consid-eration. When selecting oil for use in an industrial hydraulic system, be sure the oil:

• Containsthenecessaryadditivestoensureexcellentanti- wear characteristics

• Hasproperviscositytomaintainadequatesealingandlubri- cation at the expected operating temperature of the hydraulic system

• Includesrustandoxidationinhibitorsforsatisfactorysys- tem operation

Types of Hydraulic Fluids

Hydraulic fluids are classified by the type of base stock used. Some fluids are further classified by fluid formulation and performance.

Anti-Wear Hydraulic Fluids

For general hydraulic service, Eaton recommends the use of the new generation of anti-wear (AW) hydraulic oils containing adequate quantities of anti-wear additive.

Eaton requests that fluid suppliers test newly developed lubricants on an Eaton 35VQ25A high pressure vane pump, according to the Eaton ATS-373 test procedure, ASTM Speci-fication D-6973. Lubricants that pass the test are considered good quality, anti-wear hydraulic fluids that can be used with Eaton vane pumps at high operating conditions. They offer su-perior protection against pump wear and long service life. In additional, they provide good demulsibility, as well as protec-tion against rust.

Crankcase Oils

Automotive-type crankcase oils with American Petroleum Institute (API) letter designation SE, SF, SG, SH or higher per SAEJ183classesofoilsarerecommendedforhydraulicser-vice.The“detergent”additivetendstoholdwaterinatightemulsion and prevents separation of water.

Automotive type crankcase oils generally exhibit less shear stability, which can result in higher loss of viscosity during service life. Multiple-viscosity, industrial-grade hydraulic fluids with better shear stability will provide improved viscosity control.

Other mineral oil-based lubricants commonly used in hydraulic systems are automatic transmission fluids (ATFs) and univer-sal tractor transmission oils (UTTOs).

Synthetic Hydrocarbon

Synthetic hydrocarbon base stocks, such as polyalphaolefins (PAOs), are used to formulate ATFs and UTTos.

Environment Friendly Hydraulic Fluids

Environmental friendliness is becoming a critical need and a number of biodegradable hydraulic fluids are being used more and more in environment sensitive areas.

Biodegradable hydraulic fluids are generally classified as vegetable oil based (HETG), synthetic ester (HEES), polyal-kylene glycol (HEPG) and polyalphaolefin (HEPR). In addition, special water-glycol hydraulic fluids are used in applications in which water miscibility is necessary, along with biodegrad-able properties.

Fire-Resistant Hydraulic Fluids

Fire-resistant fluids are classified as water-containing fluids or synthetic anhydrous fluids. Water acts as a fire-retarding agent in water-containing fluids. The chemical structure of synthetic anhydrous fluids provides fire resistance.

Many applications that are prone to fire hazard, such as steel mills, foundries, die casting, mines, etc., require the use of fire resistant hydraulic fluid for improved fire safety. Fire-resistant fluids may not be fire proof, but they have better fire resistance compared to that of mineral oil.

The alternative fluids are recommended when specific proper-ties, such as fire resistance, biodegradability, etc., are neces-sary for the application. Keep in mind that alternative fluids may differ from AQ petroleum fluids in properties such as pressure viscosity coefficient, specific gravity, lubricity, etc. Hence, certain pumps/motors may need to be de-rated, some can be operated under full ratings, and others are not rated. Be sure to confirm product ratings with the specific fluid in the intended application.

Viscosity

Viscosity is the measure of a fluid’s resistance to flow. Selec-tion of hydraulic oil with a specific viscosity range should be based on the needs of the system, limitations of critical components, or proper performance of specific types of units. At system startup and during operation, Eaton recommends maintaining the oil’s maximum and minimum viscosity ranges (see chart). Very high viscosities at startup temperatures can cause noise and cavitational damage to pumps. Continuous operation at moderately high viscosities will tend to hold air in suspension in the oil, as well as generate higher operating temperatures. This can cause noise, early failure of pumps and motors, and erosion of valves. Low viscosities result in decreased system efficiency and impairment of dynamic lubrication, causing wear.

It is important to choose the proper oil viscosity for your particular system in order to achieve the startup viscosity and running viscosity range (see chart) over the entire tempera-ture range encountered. Confirm with your oil supplier that the oil viscosity will not be less than the minimum recom-mended at the maximum oil temperature of your application.

A number of anti-wear hydraulic oils containing polymeric thickeners (Viscosity Index Improvers {VII}) are available for use in low temperature applications. Temporary or permanent viscosity loss of some of these oils at operating temperature


Z-TransmissionHydraulic Fluid Recommendations

may adversely affect the life and performance of compo-nents. Before using polymer containing oils, check the extent of viscosity loss (shear stability) to avoid hydraulic service below the recommended minimum viscosity. Oil with good shear stability is recommended for low temperature applica-tions.

Multi-grade engine oils, ATFs, UTTOs, etc., also contain VIIs, and viscosity loss will be encountered during use.

Cleanliness

Fluid cleanliness is extremely important in hydraulic system. More than 70% of all failures are caused by contamination, which can reduce hydraulic system efficiency up to 20% before system malfunction may be recognized. Different hydraulic components require different cleanliness levels. The cleanliness of a hydraulic system is dictated by the cleanli-ness requirement of the most stringent component in the system. OEMs and distributors should provide their custom-ers with cleanliness requirements for Eaton hydraulic compo-nents used in their system designs. Refer to Eaton product catalogs for specific cleanliness requirements of individual components.

Fluid Maintenance

The condition of a fluid has a direct bearing on the perfor-mance and reliability of the system. Maintaining proper fluid viscosity, cleanliness level, water content, and additive level is essential for excellent hydraulic system performance. In order to maintain a healthy fluid, Eaton recommends perform-ing periodic check on the condition of the oil.

System Design Considerations

When designing a hydraulic system, the specific gravity of the hydraulic fluid needs to be taken into consideration. If the specific gravity of the fluid is higher than that of mineral oil, be sure the reservoir oil level is adequately above the pump inlet to ensure a minimum of 1.0 bar absolute pressure at the pump inlet.

Filters

Proper filter type and size, which vary depending on the type of fluid used in a system, are essential for healthy system function. The primary types of filter materials are paper, cel-lulose, synthetic fiber, and metal.

Filter media, adhesive, and seals must be compatible with the fluid used in the system. To lengthen fluid change out inter-vals, special absorbent filter media may be used to remove moisture and acids from phosphate esters.

Seals/Elastomers

Select seal/elastomer materials that are suitable for the ap-plication, minimum and maximum operating temperature, and compatibility with the type of fluid used in the hydraulic system. The effect of hydraulic fluid on a particular elastomer depends on the constituents of the fluid, temperature range, and level of contaminants.

Replacing Hydraulic Fluid

Although sometimes valid, arbitrary hydraulic fluid change-outs can result in wasted good oil and unnecessary machine downtime.

A regularly scheduled oil analysis program is recommended to determine when oil should be replaced. The program should include inspection of the oil’s color, odor, water content, solid contaminants, wear metals, additive elements, and oxidation products. Clean the system thoroughly and flush with fresh, new fluid to avoid any contamination with the previous fluid/lubricant. Replace all seals and filters with new, compatible parts. Mixing two different fluids in the same system is not recommended.

Feel free to contact your Eaton representative with questions concerning hydraulic fluid recommendations.


Z-TransmissionViscosity Requirements


Z-TransmissionViscosity Requirements

© 2013 Eaton All Rights Reserved Printed in USA DocumentNo.E-TRCD-CC001-E March 2013

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