Single, Double,Triple, VMQ125S and Thru-Drive Pumps

Single, Double,Triple,

and Thru-Drive PumpsOverhaul Service Manual

VMQ125SVMQ135SVMQ145SVMQ125TVMQ135T

VMQ145VMQ22525VMQ23525VMQ24525

VMQ24535VMQ3352525VMQ3453525Series – 30 Design

Table of Contents

2 EATON Vickers Single, Double, Triple and Thru-drive Pumps Overhaul Service Manual V-PUVN-TS001-E October 2002

Section PageI. INTRODUCTION

A. Purpose of Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3B. General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

II. DESCRIPTION

A. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3B. Model Code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5C. Assembly and Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8D. Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

III. PRINCIPLES OF OPERATION

A. Pumping Cartridge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8B. Vane Pressure Feed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8C. Hydraulic Balance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9D. Wafer Plate Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9E. Outlet Bodies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

IV. INSTALLATION AND OPERATING INSTRUCTIONS

A. Installation Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10B. Mounting and Drive Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10C. Shaft Rotation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11D. Piping and Tubing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11E. Hydraulic Fluid Recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11F. Overload Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12G. Port Positions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12H. Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

V. INSPECTION AND MAINTENANCE

A. Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13B. Adding Fluid to the System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13C. Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13D. Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13E. Replacement Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13F. Product Life . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13G. Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

VI. OVERHAUL

A. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19B. Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19C. Drive Reversal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19D. Inspection and Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20E. Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

EATON Vickers Single, Double, Triple and Thru-drive Pumps Overhaul Service Manual V-PUVN-TS001-E October 2002 3

Section I —Introduction

A. Purpose of Manual

Section II –DescriptionA. General

Related Publications –Service parts information andinstallation dimensions are notcontained in this manual. Theparts catalogs and installationdrawings are available fromauthorized distributors or Eatonsales engineers.

Model Codes – There aremany variations within each

basic model series, which arecovered by variables in themodel code. A completebreakdown of the codescovering these units is in Tables 1–3 on pages 5–7.Service inquiries should always include the completeunit model number as stamped on the pump cover.

This manual has been preparedto assist the users of Eaton’shigh performance VMQ singlepumps in properly installing,maintaining and repairing theirunit. The single, double, andtriple pumps are described indetail and their theory ofoperation is discussed inaddition to instructions forinstallation, maintenance, and overhaul.

The general series of modelscovered are VMQ125S,VMQ135S, VMQ145S,VMQ125T, VMQ135T,VMQ145T, VMQ22525,VMQ23525, VMQ24525,VMQ24535, VMQ3352525, and VMQ3453525. Theinformation given applies to the 30-39th Design VMQ.

B. General Information

Pumps in this series are usedto develop hydraulic fluid flowfor the operation of industrialand mobile equipment. Thepositive displacement pumpingcartridges are of the rotaryvane type with shaft side loadshydraulically balanced. The flowrate depends on the pump size

and the speed at which it is driven.

All units are designed so thatthe direction of rotation,pumping capacity and portpositions can be readilychanged to suit particularapplications.

Inlet Cover Cam Ring

Inlet Hole Thru Ring

Inlet Plate

Under Vane Pin

Inlet Wafer Plate

Rotor

Vane

Outlet Wafer Plate Outlet Plate Primary Shaft Seal Shaft

Secondary Shaft Seal

Shaft Bearing

Outlet Body

Cover/Body O-Ring

Figure 1a. Cutaway View of Typical High Performance VMQ Single Vane Pump


Section II —Description (cont.)

Figure 1b. Cutaway View of Typical High Performance VMQ Double Vane Pump

Figure 1c. Cutaway View of Typical High Performance VMQ Triple Vane Pump

Cover/Housing O-Ring Outlet Cover Inlet Housing

Housing/Body O-Ring

Outlet Section

Model Code —Single and Thru-Drive Pumps


Table 1. Model Code Breakdown* Verify shaft torque ratings meet or exceed input torque requirements

Series designation

VMQ1 – Vane pump single series

Frame size

25 – 10-90 cm3/r (0.62-5.49 in3/r)

35 – 90-158 cm3/r (5.49-9.64 in3/r)

45 – 140-215 cm3/r (8.54-13.12 in3/r)

Pump type

S – SingleT – Thru-drive

(Options at model codes and must be

specified for thru-drive units)

Displacement

Frame size 25010 – 10 cm 3/r (0.62 in 3/r)016 – 16 cm 3/r (0.98 in 3/r)020 – 20 cm 3/r (1.23 in 3/r025 – 25 cm 3/r (1.58 in 3/r)032 – 32 cm 3/r (1.96 in 3/r)040 – 40 cm 3/r (2.44 in 3/r)045 – 45 cm 3/r (2.75 in 3/r)050 – 50 cm 3/r (3.05 in 3/r)063 – 63 cm 3/r (3.84 in 3/r)071 – 71 cm 3/r (4.33 in 3/r)080 – 80 cm 3/r (4.88 in 3/r)090 – 90 cm 3/r (5.49 in 3/r)Frame size 35090 – 90 cm 3/r (5.49 in 3/r)100 – 100 cm 3/r (6.10 in 3/r)112 – 112 cm 3/r (6.83 in 3/r)125 – 125 cm 3/r (7.63 in 3/r)135 – 135 cm 3/r (8.24 in 3/r)140 – 140 cm 3/r (8.54 in 3/r)158 – 158 cm 3/r (9.64 in 3/r)Frame size 45140 – 140 cm 3/r (8.54 in 3/r)160 – 160 cm 3/r (9.76 in 3/r)180 – 180 cm 3/r (10.98 in 3/r)195 – 195 cm 3/r (11.89 in 3/r)215 – 215 cm 3/r (13.12 in 3/r)

Front flange mounting style

A – (Frame size 25 only)SAE B 2-bolt

101,60 (4.000) x 9,4 (0.37) pilot14,4 (0.57) slots on 146,0 (5.75) bolt circle

B – (Frame sizes 35 & 45 only)SAE C 2-bolt

127,00 (5.000) x 12,4(0.49) pilot17,6 (0.69) slots on 181,0 (7.13) bolt circle

C – (Frame size 25 only)ISO 3019/2 100A2HW 2-bolt


D – (Frame sizes 35 & 45 only)ISO 3019/2 125A2HW 2-bolt


Rear mounting flange and orientationViewed from cover end of pump (Adapter end forthru-drive units, model code = T)

0 – None (non thru-drive)SAE AA – In-line with mounting

flange (frame sizes 25 & 45)

B – 90° to mounting flange (frame sizes 25 & 45)

C – 45° CCW to mounting flange (frame size 35)

D – 45° CW to mounting flange (frame size 35)

SAE BE – In-line with mounting

flange (frame sizes 25 & 45)

F – 90° to mounting flange(frame sizes 25 & 45)

G – 45° CCW to mountingflange (frame size 35)

H – 45° CW to mountingflange (frame size 35)

SAE CJ – In-line with mounting

flange (frame size 35)K – 90° to mounting flange

(frame size 35)L – 45° CCW to mounting

flange (frame size 45)M – 45° CW to mounting

flange (frame size 45)

Input shaft type*

01 – SAE J744 keyedFrame size 25:

25,40 (1.000)Frame size 35:

31,75 (1.250)Frame size 45:

38,10 (1.500)02 – SAE J744 splined

Frame size 25: B-BFrame size 35: CFrame size 45: C-C

03 – ISO 3019/2 keyedFrame size 25:

25,00 (0.984)Frame size 35:

32,00 (1.260)Frame size 45:

40,00 (1.575)05 – SAE J744 keyed

Frame size 25: 31,75 (1.250)

Frame size 35: 38,10 (1.500)

Frame size 45: 44,45 (1.750)

06 – SAE J744 splinedFrame size 25: CFrame size 35: C-CFrame size 45: D

07 – ISO 3019/2 keyedFrame size 25: 32,00 (1.260)Frame size 35: 40,00 (1.575)

09 – SAE J744 splinedFrame size 25: BFrame size 45: C(Not available on thru-drive units)

Output shaft coupling

Thru-drive units, model code = T

00 – None (non thru-drive)16 – SAE J744 16-4 A-spline

shaft22 – SAE J744 22-4 B-spline

shaft25 – SAE J744 25-4 B-B-spline

shaft32 – SAE J744 32-4 C-spline

shaft (frame sizes 35 & 45 only)

Inlet port type

A – SAE J518 4-bolt splitflange

B – ISO 6162 4-bolt splitflange

Outlet port type

A – SAE J518 4-bolt flangeB – ISO 6162 4-bolt flange

Outlet port position

Viewed from cover end ofpump (Adapter end forthru-drive units)

A – Opposite inlet portB – 90° CCW to inlet portC – In-line with inlet portD – 90° CW to inlet port

Shaft seal

A – Single, primaryB – Double, secondary

(spring side out)Recommended for wetmount applications

Seal type

N – Buna NV – VitonW – Buna N with Viton shaft

seal(s)

Shaft rotation

Viewed from shaft end of pump

L – Left hand (CCW)R – Right hand (CW)

Special features

00 – None

Paint

0 – NoneA – Blue

Customer identification

0 – None

Design code

30 – 30 designInstallation dimensionsremain unchanged fordesign numbers 30 to 39inclusive.

27 28

26

25

23 24

22

21

20

19

18

17

7

15 16

13 14

7

12

11

8 9 10

15 1612

7

5 6

1 2 3 4

VMQ1 ** * *** * * ** ** * * * * * * 00 * 0 30

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28

Model Code —Double Pumps

Table 2. Model Code Breakdown


* Verify shaft torque ratings meet or exceed input torque requirements

Series designation

VMQ2 – Vane pump double series

Frame size (front section)

25 – 10-90 cm3/r (0.62-5.49 in3/r)

35 – 90-158 cm3/r (5.49-9.64 in3/r)

45 – 140-215 cm3/r (8.54-13.12 in3/r)

Frame size (rear section)

25 – 10-90 cm 3/r (0.62-5.49 in3/r)

35 – 90-158 cm 3/r(5.49-9.64 in 3/r)

Pump type

S – Standard

Displacement (front section)

Frame size 25010 – 10 cm 3/r (0.62 in 3/r)016 – 16 cm 3/r (0.98 in 3/r)020 – 20 cm 3/r (1.23 in 3/r025 – 25 cm 3/r (1.58 in 3/r)032 – 32 cm 3/r (1.96 in 3/r)040 – 40 cm 3/r (2.44 in 3/r)045 – 45 cm 3/r (2.75 in 3/r)050 – 50 cm 3/r (3.05 in 3/r)063 – 63 cm 3/r (3.84 in 3/r)071 – 71 cm 3/r (4.33 in 3/r)080 – 80 cm 3/r (4.88 in 3/r)090 – 90 cm 3/r (5.49 in 3/r)Frame size 35090 – 90 cm 3/r (5.49 in 3/r)100 – 100 cm 3/r (6.10 in 3/r)112 – 112 cm 3/r (6.83 in 3/r)125 – 125 cm 3/r (7.63 in 3/r)135 – 135 cm 3/r (8.24 in 3/r)140 – 140 cm 3/r (8.54 in 3/r)158 – 158 cm 3/r (9.64 in 3/r)Frame size 45140 – 140 cm 3/r (8.54 in 3/r)160 – 160 cm 3/r (9.76 in 3/r)180 – 180 cm 3/r (10.98 in 3/r)195 – 195 cm 3/r (11.89 in 3/r)215 – 215 cm 3/r (13.12 in 3/r)

Displacement (rear section)

Frame size 25010 – 10 cm 3/r (0.62 in 3/r)016 – 16 cm 3/r (0.98 in 3/r)020 – 20 cm 3/r (1.23 in 3/r)025 – 25 cm 3/r (1.58 in 3/r)

032 – 32 cm 3/r (1.96 in 3/r)040 – 40 cm 3/r (2.44 in 3/r)045 – 45 cm 3/r (2.75 in 3/r)050 – 50 cm 3/r (3.05 in 3/r)063 – 63 cm 3/r (3.84 in 3/r)071 – 71 cm 3/r (4.33 in 3/r)080 – 80 cm 3/r (4.88 in 3/r)090 – 90 cm 3/r (5.49 in 3/r)Frame size 35090 – 90 cm 3/r (5.49 in 3/r)100 – 100 cm 3/r (6.10 in 3/r)112 – 112 cm 3/r (6.83 in 3/r)125 – 125 cm 3/r (7.63 in 3/r)135 – 135 cm 3/r (8.24 in 3/r)140 – 140 cm 3/r (8.54 in 3/r)158 – 158 cm 3/r (9.64 in 3/r)


A – (Frame size 25 only)SAE B 2-bolt


B – (Frame sizes 35 & 45 only)SAE C 2-bolt


C – (Frame size 25 only)ISO 3019/2 100A2HW 2-bolt


D – (Frame sizes 35 & 45 only)ISO 3019/2 125A2HW 2-bolt


Adapter flange 0 – None (standard

double pump)

Input shaft type*


25,40 (1.000)Frame size 35:

31,75 (1.250)Frame size 45:

38,10 (1.500)

02 – SAE J744 splinedFrame size 25: B-BFrame size 35: CFrame size 45: C-C


25,00 (0.984)Frame size 35:

32,00 (1.260)Frame size 45:

40,00 (1.575)05 – SAE J744 keyed

Frame size 25: 31,75 (1.250)

Frame size 35: 38,10 (1.500)

Frame size 45: 44,45 (1.750)

06 – SAE J744 splinedFrame size 25: CFrame size 35: C-CFrame size 45: D


32,00 (1.260)Frame size 35:

40,00 (1.575)09 – SAE J744 Spline

Frame size 45: C

Output shaft coupling

00 – None (standard double pump)

Inlet port type

A – SAE J518 4-split flangeB – ISO 6162 4-bolt flange

Front outlet port type


Rear outlet port type


Front outlet port positionViewed from cover end ofpump

A – Opposite inlet portB – 90° CCW to inlet portC – In-Line with front

inlet portD – 90° CW to inlet port

Rear outlet port positionViewed from cover end of pump

A – 135° CCW to inlet port(not available with 2525)

B – 45° CCW to inlet port(not available with 2525)

C – 45° CW to inlet port (not available with 2525)

D – 135° CW to inlet port (not available with 2525)

E – Opposite inlet port (2525 only)

F – 90° CCW to inlet port(2525 only)

G – In-line with inlet port(2525 only)

H – 90° CW to inlet port (2525 only)

Shaft Seal

A – Single, primaryB – Double, secondary


Seal Type

N – Buna-NV – VitonW – Buna-N with Viton

shaft seal(s)

Shaft rotation

Viewed from shaft end of pump

L – Left Hand (CCW)R – Right Hand (CW)

Special features00 – None

Paint

O – NoneA – Blue

Customer identification

O – None

Design code30 – 30 design

Installation dimensionsremain unchanged fordesign numbers 30 to 39inclusive.

34 35

33

32

30 31

29

28

27

26

25

24

23

22

20 21

18 19

17

16

13 14 15

10 11 12

9

7 8

5 6

1 2 3 4

VMQ2 ** ** S *** *** * 0 ** 00 * * * * * * * * 00 * 0 30

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35

Table 3. Model Code Breakdown


Model Code —Triple Pumps

* Verify shaft torque ratings meet or exceed input torque requirements

Series designation

VMQ3 – Vane pump triple series

Frame size (front section)

35 – 90-158 cm 3/r (5.49-9.64 in 3/r)

45 – 140-215 cm 3/r (8.54-13.12 in 3/r)

Frame size (middle section)

25 – 10-90 cm 3/r (0.62-5.49 in3/r)

35 – 90-158 cm 3/r(5.49-9.64 in 3/r)

Frame size (rear section)

25 – 10-90 cm 3/r (0.62-5.49 in3/r)

Displacement (front section)

Frame size 35090 – 90 cm 3/r (5.49 in 3/r)100 – 100 cm 3/r (6.10 in 3/r)112 – 112 cm 3/r (6.83 in 3/r)125 – 125 cm 3/r (7.63 in 3/r)135 – 135 cm 3/r (8.24 in 3/r)140 – 140 cm 3/r (8.54 in 3/r)158 – 158 cm 3/r (9.64 in 3/r)Frame size 45140 – 140 cm 3/r (8.54 in 3/r)160 – 160 cm 3/r (9.76 in 3/r)180 – 180 cm 3/r (10.98 in 3/r)195 – 195 cm 3/r (11.89 in 3/r)215 – 215 cm 3/r (13.12 in 3/r)

Displacement (middle section)

Frame size 25010 – 10 cm 3/r (0.62 in 3/r)016 – 16 cm 3/r (0.98 in 3/r)020 – 20 cm 3/r (1.23 in 3/r025 – 25 cm 3/r (1.58 in 3/r)032 – 32 cm 3/r (1.96 in 3/r)040 – 40 cm 3/r (2.44 in 3/r)045 – 45 cm 3/r (2.75 in 3/r)050 – 50 cm 3/r (3.05 in 3/r)063 – 63 cm 3/r (3.84 in 3/r)071 – 71 cm 3/r (4.33 in 3/r)080 – 80 cm 3/r (4.88 in 3/r)090 – 90 cm 3/r (5.49 in 3/r)

Frame size 35090 – 90 cm 3/r (5.49 in 3/r)100 – 100 cm 3/r (6.10 in 3/r)112 – 112 cm 3/r (6.83 in 3/r)125 – 125 cm 3/r (7.63 in 3/r)135 – 135 cm 3/r (8.24 in 3/r)140 – 140 cm 3/r (8.54 in 3/r)158 – 158 cm 3/r (9.64 in 3/r)

Displacement (rear section)

Frame size 25010 – 10 cm 3/r (0.62 in 3/r)016 – 16 cm 3/r (0.98 in 3/r)020 – 20 cm 3/r (1.23 in 3/r)025 – 25 cm 3/r (1.58 in 3/r)032 – 32 cm 3/r (1.96 in 3/r)040 – 40 cm 3/r (2.44 in 3/r)045 – 45 cm 3/r (2.75 in 3/r)050 – 50 cm 3/r (3.05 in 3/r)063 – 63 cm 3/r (3.84 in 3/r)071 – 71 cm 3/r (4.33 in 3/r)080 – 80 cm 3/r (4.88 in 3/r)090 – 90 cm 3/r (5.49 in 3/r)


A – SAE C 2-bolt SAE J744 127-2


B – ISO 3019/2 125A2HW 2-bolt

125,00 (4.921) x 9,2 (0.36) pilot18,1 (0.71) slots on180,0 (7.09) bolt circle

Input shaft type*


31,75 (1.250)Frame size 45:

38,10 (1.500)02 – SAE J744 splined

Frame size 35: CFrame size 45: C-C


32,00 (1.260)Frame size 45:

40,00 (1.575)


38,10 (1.500)Frame size 45:

44,45 (1.750)06 – SAE J744 splined

Frame size 35: C-CFrame size 45: D


40,00 (1.575)

Port type

A – Inlet: SAE J518 4-boltflangeFront outlet: SAE J518 4-bolt flangeMiddle outlet: SAE J5184-bolt flangeRear outlet: SAE J518 4-bolt flange

B – Inlet: ISO 6162 4-boltflangeFront outlet: ISO 6162 4-bolt flangeMiddle outlet: ISO 6162 4-bolt flangeRear outlet: ISO 6162 4-bolt flange

Front outlet port positionViewed from cover end of pump


Middle outlet port positionViewed from cover end of pump


Rear outlet port positionViewed from cover end of pump

352525 unitsA – 135° CCW to inlet portB – 45° CCW to inlet portC – 45° CW to inlet portD – 135° CW to inlet port453525 unitsE – Opposite inlet portF – 90° CCW to inlet portG – In-line with inlet portH – 90° CW to inlet port

Shaft sealA – Single, primaryB – Double, secondary


Seal type

N – Buna NV – VitonW – Buna N with Viton

shaft seal(s)

Shaft rotationViewed from shaft end of pump

L – Left hand (CCW)R – Right hand (CW)

Special features00 – None

Paint0 – NoneA – Blue

Customer identification0 – None

Design code30 – 30 design

Installation dimensionsremain unchanged fordesign numbers 31 to 39 inclusive.

34 35

33

32

30 31

29

28

27

26

25

24

23

21 22

20

17 18 19

14 15 16

11 12 13

9 10

7 8

5 6

1 2 3 4

VMQ3 ** ** 25 *** *** *** * ** * * * * * * * 00 * 0 30

1 2 3 4 5 6 7 8 11 12 13 20 21 22 24 25 26 27 28 29 32 33 34 359 10 14 15 16 17 18 19 23 30 31

Inlet

Inlet

Inlet

Shaft

Cam ring

OutletOutlet

Outlet

Vane

Pump rotation

Rotor

Section II —Description (cont.)

B. Assembly and Construction

Section III –Principles ofOperationA. Pumping Cartridge

VMQ Pumps can be used inboth industrial and mobileapplications. For pump ratings,methods of installation or otherapplication information, refer to

the applicable sales installationdrawing or consult anapplication engineer.

Basic Pumps. The pumpillustrated in Figure 1 isrepresentative of all singlepumps in this series. The pumpconsists principally of an inlethousing, outlet body, driveshaft, and pumping cartridge.The principal components of acartridge are an elliptical camring, a slotted rotor splined tothe drive shaft, an inlet and

outlet support plate, two waferplates on either side of thecam ring, and twelve vanesand under vane pins fitted tothe rotor slots. Fluid enters thecartridge through the inlet portin the cover and is dischargedthrough the outlet wafer plateand support plate to the outletport in the body.

C. Application

As mentioned in Section II,fluid flow is developed in thepumping cartridge. The actionof the cartridge is illustrated inFigure 3. The rotor is drivenwithin the ring by thedriveshaft, which is coupled toa power source. As the rotorturns, centrifugal force on thevanes, aided by under-vanepressure fed from the outletport, causes the vanes tofollow the elliptical innersurface of the ring.

Radial movement of the vanesand turning of the rotor causes

the chamber volume betweenthe vanes to increase as thevanes pass the inlet sectionsof the ring. This results in alow pressure condition whichallows atmospheric pressureto force fluid into thechambers.

An additional inlet fluid pathexists through a drilled hole inthe cam ring. This holeconnects the inlet port directlyto the inlet areas of the camring and provides an additionalflow path for fluid to get intothe cartridge. See Figure 2.

Fluid is trapped between thevanes and carried past asealing land to the outletsection of the ring. As theoutlet section is approached,the chamber volumedecreases and fluid is forcedout into the system. Systempressure is fed under thevanes via the under vane pins,assuring their sealing contactagainst the ring during normaloperation.

The pin-vane design provides ameans of controlling outwardthrust of the vane against thering and maintains tip loadswithin reasonable limits. In thepin-vane cartridge, full system

pressure is continuouslyapplied only to the crosssectional area of the pin. Thisarea is small and thrust iscorrespondingly light. Thisselective application of

pressure assures that thevanes will always be in contactwith the cam ring. A detaileddrawing of the VMQ rotatinggroup can be seen in Figure 4.

B. Vane Pressure Feed


Figure 3Figure 2


Section III —Principles ofOperation (cont.)

C. Hydraulic Balance

The main function of the wafer plates is to control thepressure timing of the pump.Machined cavities in the waferplates distribute high pressurefrom the outlet ports to theterminal holes in the rotor.These cavities also feed highpressure through the rotor tothe pins behind the vanes.With high pressure distributedthrough the rotor and appliedto the under vane pins, theforces between the vane tipand cam are regulated. Finally,metering grooves in the platesare positioned in such a way toreduce excess cavitation, thus

limiting the overall sound levelof the pump. The position ofthe wafer plates in thecartridge kit can be seen inFigure 5.

VMQ wafer plates have abronze finish that rides next tothe rotor and provides excellentwear and thermal shockcharacteristics.

The inlet and outlet supportplates hold the wafer plates inposition and contain passageswhich allow fluid to pass fromthe inlet port to the pumpingcartridge and from thecartridge to the outlet port.

The pump ring is shaped sothe two pumping chambers areformed 180 degrees apart(Figure 3). Thus, opposing

hydraulic forces which develop side loads on the shaft cancel out.

D. Wafer Plate Operation

Figure 5. Wafer Plate Operation

Inlet Window

Vane Cross Section

Pressure Balance Holes in Vane

Under Vane Pin

Rotor Terminal Hole

Rotor Bushing

Wafer Plate

Outlet Window

Rotor

Figure 4. VMQ Wafer Plate, Rotor and Vanes

Wafer Plates

Under Vane Pin

Internal Rotor Cavity

Rotor Terminal Hole

Outlet Port

Inlet Port


Section III —Principles ofOperation (cont.)E. Outlet Bodies Two outlet body configurations

and two shaft seal arrange-ments are available for theseries 30 VMQ pumps. SeeFigures 6a and 6b.

Double shaft seal modelsutilize a drain hole openingbetween the two seals. Thisdrain hole is used to preventcross contamination betweenthe gearbox and the pump.

If one seal were to fail, thefluid would drain through thehole and not past the opposingseal. Series 30 VMQ pumpsuse shaft seals that are rated at20 PSIG (1.38 bar). Higherpressure shaft seals areavailable. See your Eaton salesrepresentative for furtherdetails.

Section IV – Installation andOperating InstructionsA. Installation Drawings

See the series 30 VMQproduct catalog for installationdimensions.

B. Mounting and Drive Connections Eaton high performance vanepumps are designed for foot orflange mounting.

1. Direct Drive. A pilot on thepump mounting flange (Figure7) assures correct mountingand shaft alignment, providedthe pilot is firmly seated in theaccessory pad of the powersource. Care should beexercised in tightening allflange mounting screws toprevent misalignment.

If gaskets are used betweenflanges, they should beinstalled carefully so as to lieflat and should not be the typethat will take a set. Shaft keysand couplings must be properlyseated to avoid slipping andpossible shearing.

Proper coupling alignment isessential to prolong pump life.

Primary Seal Primary Seal

Secondary Seal

Figure 6a. Single Shaft Seal Models Figure 6b. Double Shaft Seal Models

Drain Hole


Section IV — Installation and OperatingInstructions (cont.)

C. Shaft Rotation

General Data

Oil in a hydraulic systemperforms the dual function oflubrication and transmission ofpower. It constitutes a vitalfactor in a hydraulic system andcareful selection of it should bemade with the assistance of areputable supplier. Properselection of oil assuressatisfactory life and operationof system components withparticular emphasis onhydraulic pumps. Any oilselected for use with pumps isacceptable for use with valvesor motors.

See the Series 30 VMQproduct catalog for hydraulicfluid guidelines.

Where special considerationsindicate a need to depart fromthe recommended oils oroperating conditions, see yourEaton representative.

Cleanliness

Clean fluid is the bestinsurance for long service life.Eaton recommends a fluid

cleanliness of ISO 18/16/13 orbetter. To insure your hydraulicsystem is clean, perform thefollowing steps.

1. Clean (flush) entire newsystem to remove paint, metalchips, welding shot, etc.

2. Filter each change of oil toprevent introduction ofcontaminants into the system.

3. Provide continuous oilfiltration to remove sludge andproducts of wear and corrosiongenerated during the life of thesystem.

4. Provide continuousprotection of system fromentry of airbornecontamination, by sealing thesystem and/or by properfiltration of the air.

5. Proper oil filling andservicing of filters, breathers,reservoirs, etc., cannot beoveremphasized.

6. Good system and reservoirdesign will insure that aerationof the oil is kept to a minimum.

CAUTION

Pump shafts aredesigned to beinstalled in

couplings with a slip fit or verylight press. Pounding thecoupling on the shaft can ruinthe bearings. Shaft tolerancesare shown on the pumpinstallation drawings.

2. Indirect Drive. Indirect driveis not recommended for thesepumps.

Figure 7. Pilot Diameter

Pilot Diameter

Shaft

NOTE

Pumps are normallyassembled for right hand(clockwise) rotation as viewedfrom the shaft end. A pumpmade for left hand rotation isidentified by an “L” in themodel code. (See Table 1)

NOTE

If it is desired to reverse thedirection of drive rotation, it isnecessary to disassemble thepump and reverse the locationof the cartridge cam ring andwafer plates. (See Section VI,Part C)

CAUTION

Never drive apump in the wrongdirection of

rotation. Seizure may result,necessitating extensiverepairs.

D. Piping and Tubing 1. All pipes and tubing must bethoroughly cleaned beforeinstallation. Recommendedmethods of cleaning aresandblasting and wirebrushing.

2. To minimize flow resistanceand the possibility of leakage,use only as many fittings andconnections as necessary forproper installation.

3. The number of bends intubing should be kept to aminimum to prevent excessiveturbulence and friction of oilflow. Tubing must not be benttoo sharply. The recommendedradius for bends is three timesthe inside diameter of thetube.

E. Hydraulic Fluid Recommendations


Section IV — Installation and OperatingInstructions (cont.)

F. Overload Protection

Self priming: With a minimumdrive speed of 600 RPM, apump should primeimmediately. Failure to primewithin a short length of timemay result in damage due tolack of lubrication. Inlet linesmust be tight and free from airleaks. However, it may be

necessary to loosen a fitting onthe outlet side of the pump topurge entrapped air.

No load starting: Thesepumps are designed to start upwith no load on the pressureports. They should never bestarted against a load or aclosed center valve.

E. Hydraulic Fluid Recommendations (cont.) Sound Level

Noise is indirectly affected bythe fluid selection, but thecondition of the fluid is ofparamount importance inobtaining optimum reduction of system sound levels.

Some of the major factorsaffecting fluid conditions thatcause the loudest noises in ahydraulic system are:

1. Very high viscosities at start-up temperatures can causepump noises due to cavitation.

2. Running with a moderatelyhigh viscosity fluid will slowthe release of entrained air. Thefluid will not be completely

purged of such air in the time itremains in the reservoir and airwill be recycled through thesystem.

3. Aerated fluid can also becaused by ingestion of airthrough the pipe joints of inletlines, high velocity dischargelines, cylinder rod packings, orby fluid discharging above thefluid level in the reservoir. Air inthe fluid causes a noise similarto cavitation.

4. Contaminated fluids cancause excessive wear ofinternal pump parts, which may result in increased sound levels.

Relief valves must be installedin the system as close to thepump outlets as possible. Therelief valve limits pressure ineach system to a prescribedmaximum and protects

components from excessivepressure. Each relief valvepressure setting depends onthe work requirements of thecircuit being fed.

G. Port Positions

H. Start-Up

The pump cover can beassembled in four positionswith respect to the body. A letter in the model codeidentifies the orientation of theinlet and outlet ports. The coverposition of a VMQ single pumpis shown in Figure 8 as anexample.

Inlet Cover PositionsModel (Viewed from cover end)VMQ1* *A* * 030 Opposite Outlet PortVMQ1* *B* * 030 90°Clockwise from OutletVMQ1* *C* * 030 Inline with OutletVMQ1* *D* * 030 90° Counterclockwise from Outlet

Figure 8. Cover Positions

Disassembly and assembly procedures are in Section VI-B and E.

Whenever it is possible to doso, fill the pump ports withsystem hydraulic fluid. Thiswill make it easier for thepump to prime when it is firststarted.

Body (Outlet)Cover (Inlet)

A

B

C

D


Section V —Inspection andMaintenanceA. Inspection

B. Adding Fluid to the System

Table 4 lists the commondifficulties experienced withvane pumps and hydraulicsystems. It also indicates theprobable causes and remediesfor each of the troubles listed.

It should always beremembered that many

apparent pump failures areactually due to the failure ofother parts of the system. Thecause of improper operation isbest diagnosed with adequatetesting equipment and athorough under-standing of thecomplete hydraulic system.

Periodic inspection of the fluidcondition and tube or pipingconnections reduce timeconsuming breakdowns and unnecessary partsreplacement. The followingshould be checked regularly.

1. All hydraulic connectionsmust be kept tight. A looseconnection in a pressure linewill permit the fluid to leakout. If the fluid level becomesso low as to uncover the inletpipe opening in the reservoir,extensive damage to thepump can result. In suction orreturn lines, loose connectionspermit air to be drawn into thesystem, resulting in noisyand/or erratic operation.

2. Clean fluid is the bestinsurance for long service life.Therefore, the reservoir shouldbe checked periodically for dirtor other contaminates. If thefluid becomes contaminated,the system should bethoroughly drained and thereservoir cleaned before newfluid is added.

3. Filter elements also shouldbe checked and replacedperiodically. A clogged filterelement results in a higherpressure drop. This can forceparticles through the filterwhich would ordinarily betrapped, or can cause thebypass to open, resulting in a partial or complete loss offiltration.

4. Air bubbles in the reservoircan ruin the pump and othercomponents. If bubbles areseen, locate the source of theair and seal the leak. (SeeTable 3)

5. A pump which is runningexcessively hot or noisy is apotential failure. Should apump become noisy or over-heated, the machine should beshut down immediately andthe cause of improperoperation corrected.

When hydraulic fluid is addedto replenish the system, itshould always be pouredthrough a fine wire screen(200 mesh or finer) orpreferably pumped through a 10 micron (absolute) filter.

It is important that the fluid beclean and free of any

substance which could causeimproper operation or wear ofthe pump or other hydraulicunits. Therefore, the use ofcloth to strain the fluid shouldbe avoided to prevent lint fromgetting into the system.

C. Adjustments No periodic adjustments arerequired, other than tomaintain proper shaft

alignment with the drivingmedium.

D. Lubrication Internal lubrication is providedby the fluid in the system.Lubrication of the shaft

coupling should be as specifiedby their manufacturers.

E. Replacement Parts Reliable operation throughoutthe specified operating rangeis assured only if genuineVickers parts are used.Sophisticated design

processes and materials areused in the manufacture of ourparts. Substitutions may resultin early failure.

F. Product Life

G. Troubleshooting

The longevity of theseproducts is dependent uponenvironment, duty cycle,operating parameters andsystem cleanliness. Sincethese parameters vary from

application to application, theultimate user must determineand establish the periodicmaintenance required tomaximize life and detectpotential component failure.


Section V —Inspection andMaintenance(cont.)

TROUBLE PROBABLE CAUSE REMEDY

Pump not delivering fluid. Driven in the wrong direction of rotation. The drive direction must be changed immediately toprevent seizure. Refer to Section VI.C. for the correctring position for each direction of rotation.

Coupling or shaft sheared or disengaged. Disassemble the pump and check the shaft andcartridge for damage. (See Section VI) Replace thenecessary parts.

Fluid intake pipe in reservoir restricted. Check all strainers and filters for dirt and sludge. Clean if necessary.

Fluid viscosity too heavy to pick up prime. Completely drain the system. Add new filtered fluid ofthe proper viscosity.

Air leaks at the intake. Pump not Check the inlet connections to determine where air is priming. being drawn in.Tighten any loose connections. See that

the fluid in the reservoir is above the intake pipeopening. Check the minimum drive speed which may be too slow to prime the pump.

Vane(s) stuck in the rotor slots(s). Disassemble the pump. Check for dirt or metal chips.Clean the parts thoroughly and replace any damagedpieces. If necessary, flush the system and refill it withclean fluid.

Insufficient pressure build-up. System relief valve set too low. Use a pressure gage to correctly adjust the valve.Pump making noise. Pump intake partially blocked. Service the intake strainers. Check the fluid condition

and, if necessary, drain and flush the system. Refill with clean fluid.

Air leaks at the intake or shaft seal. Check the inlet connections and seal to determine(Oil in reservoir would probably be foamy.) where air is being drawn in.tighten any loose

connections and replace the seal if necessary. See that the fluid in the reservoir is above the intake pipeopening.

Pump drive speed too slow or too fast. Operate the pump at the recommended speed.Coupling misalignment. Check if the shaft seal bearing or other parts have

been damaged. Replace any damaged parts. Realign the coupled shafts.

Table 4. Troubleshooting Chart



Bearing

O-Ring

Retaining Ring

Back Up Ring

O-Ring

Outlet Body

Cover/Body O-Ring

Secondary Seal

Key

Primary Seal

Shafts

Outlet Support Plate

Inlet Cover

Assembly Pin

Kit Seals

Housing Bolt

Inlet Wafer Plate

Inlet Support Plate

Cartridge Torque Pin

Vane and Under Vane Pin

Rotor

Retaining Ring

Back Up Ring

Anti Rotation Torque Pin

Cam Ring Outlet Wafer Plate

Figure 9a. Exploded View of VMQ Single Pump

Table 5 - Single Pump Housing Torque Specs

ISO (NM) SAE (ft•lb)

Dry Oiled Dry Oiled

VMQ125 153 ± 16 115 ± 12 113 ± 11 85 ± 9 VMQ135 305 ± 31 229 ± 23 225 ± 23 169 ± 17 VMQ145 305 ± 31 229 ± 23 225 ± 23 169 ± 17



O-Rings Inlet Housing

Thru-Drive Coupling

Thru-Drive Adapter

Thru-Drive Shafts

Table 6 - Thru-Drive Pump Housing Torque Specs

INLET HOUSING THRU-DRIVE ADAPTOR (SAE A & SAE B) THRU-DRIVE ADAPTOR (SAE C)

ISO (NM) SAE (ft•lb) ISO (NM) SAE (ft•lb) ISO (NM) SAE (ft•lb)

Dry Oiled Dry Oiled Dry Oiled Dry Oiled Dry Oiled Dry Oiled

VMQ125T 153+/-16 115+/-12 113+/-11 85+/-9 — — — — — — —VMQ135T 305+/-31 229+/-23 225+/-23 169+/-17 153+/-16 115+/-12 113+/-11 85+/-9 305+/-31 229+/-23 225+/-23 169+/-17VMQ145T 305+/-31 229+/-23 225+/-23 169+/-17 153+/-16 115+/-12 113+/-11 85+/-9 305+/-31 229+/-23 225+/-23 169+/-17

Figure 8b. Exploded View of VMQ Thru-Drive Pump



Table 7 - Double and Triple Pump Housing Torque Specs

INLET HOUSING OUTLET COVER OUTLET SECTION



VMQ22525 153+/-16 115+/-12 113+/-11 85+/-9 — — — — — — — —VMQ23525 305+/-31 229+/-23 225+/-23 169+/-17 153+/-16 115+/-12 113+/-11 85+/-9 — — — —VMQ24525 305+/-31 229+/-23 225+/-23 169+/-17 153+/-16 115+/-12 113+/-11 85+/-9 — — — —VMQ24535 305+/-31 229+/-23 225+/-23 169+/-17 305+/-3 229+/-23 225+/-23 169+/-17 — — — —VMQ3352525 305+/-31 229+/-23 225+/-23 169+/-17 153+/-16 115+/-12 113+/-11 85+/-9 305+/-31 229+/-23 225+/-23 169+/-17VMQ3453525 305+/-31 229+/-23 225+/-23 169+/-17 153+/-16 115+/-12 113+/-11 85+/-9 305+/-31 229+/-23 225+/-23 169+/-17

Figure 9c. Exploded View of VMQ Double Pump

Outlet Cover

Inlet Housing



Figure 9d. Exploded View of VMQ Triple Pump

Outlet Section

Table 7 - Double and Triple Pump Housing Torque Specs

INLET HOUSING OUTLET COVER OUTLET SECTION



VMQ22525 153+/-16 115+/-12 113+/-11 85+/-9 — — — — — — — —VMQ23525 305+/-31 229+/-23 225+/-23 169+/-17 153+/-16 115+/-12 113+/-11 85+/-9 — — — —VMQ24525 305+/-31 229+/-23 225+/-23 169+/-17 153+/-16 115+/-12 113+/-11 85+/-9 — — — —VMQ24535 305+/-31 229+/-23 225+/-23 169+/-17 305+/-3 229+/-23 225+/-23 169+/-17 — — — —VMQ3352525 305+/-31 229+/-23 225+/-23 169+/-17 153+/-16 115+/-12 113+/-11 85+/-9 305+/-31 229+/-23 225+/-23 169+/-17VMQ3453525 305+/-31 229+/-23 225+/-23 169+/-17 153+/-16 115+/-12 113+/-11 85+/-9 305+/-31 229+/-23 225+/-23 169+/-17


Section VI —Overhaul

B. Disassembly

WARNING

Before breaking acircuit connection,make certain that

power is off and systempressure has been released.Lower all vertical cylinders,discharge accumulators andblock any load whose movementcould generate pressure. Plug allremoved units and cap all linesto prevent the entry of dirt intothe system.

During disassembly, payparticular attention toidentification of the parts,especially the cartridges, forcorrect assembly. Figure 9 is anexploded view which shows theproper relationship of parts fordisassembly and assembly.Refer to Figure 9 for the correctassembled relationship of theparts. Various steps in theoverhaul process are shown inFigures 10 through 17.

A. General

Basic Pump. Remove the footmounting and shaft key if used.Support the pump on blocks orclamp the body in a vise asshown in Figure 10. If a vise isused, use protective jaws toavoid damage to the body andits machined surfaces. Mark the pump body and cover forcorrect reassembly. Remove the necessary screws todisassemble the housing.

Remove all Housing O-Rings.Pull and/or pry out thecartridge(s) as shown in Figure 11.

Remove the large spirolox ringand pull the shaft and bearingfrom the body. Drive the shaftseals out of the body. If it isnecessary to remove the shaftbearing, first remove the smallsnap ring and then press theshaft out of the bearing whilesupporting the bearing innerrace.

The rotation of Eaton cartridgekits can easily be changed fromclockwise to counterclockwise,or vice versa, by following thesteps outlined below:

NOTE: A double or triple VMQpump will contain cartridge kitsthat mirror one another. Therotation direction of each kit is specific to the pumpconfiguration. See Table 8 for application details.

Figure 10. Beginning disassembly

Figure 11. Cartridge removal

Figure 12

NOTEComplete cartridges areavailable in service kits for rebuilding these pumps.Refer to the Series 30 VMQParts catalog for partnumbers.

Cover Screw

Index marks for assemblyreference

If vice is used,clamp here.

C. Drive Reversal

See figures 12 - 20 for apictorial explanation.

1. Once the cartridge kit has been removed from thehousing, place the kit on a cleanflat bench, outlet support platedown. (Figure 12)

2. Remove the two socket headcap screws holding the kittogether. Note the location ofthe two screws in the inlet plate.When the kit is reassembled inthe opposite direction, thesescrews will be installed in theopposite set of inlet plate holes.(Figure 13)

3. Slide the inlet support plateoff of the inlet wafer plate.(Figure 14)

4. Remove the inlet wafer plate,cam ring, rotor, vanes, andoutlet wafer plate as one unitfrom the outlet support plate.(Figure 15)

5. Rotate this group ofcomponents 180 degrees and place it back on the outletsupport plate. The etched arrowin the ring should be pointingthe opposite direction as before.Do not attempt to remove the

vanes. They should be containedbetween the wafer plates as the180° rotation is performed. (Figure 16)

6. Align the inlet windows of the wafer plates to the inletwindows of the outlet supportplate.Place the inlet supportplate back on the rotating group,aligning its inlet windows withthe rest of the kit. Reinstall andfinger tighten the socket headcap screws in the opposite setof holes as before. In order forthe kit to fit back in the housing,it must first be aligned. This canbe done by placing the kit on itsside and rolling it on a hard, flat,clean bench. While the kit is onits side, tighten the SCHS snug.Finally, place the kit upright andtighten the screws to the torquespecs below (Figures 17-20):

25 VMQ 20 in.lb. (2.28 Nm)

35 VMQ 20 in.lb. (2.28 Nm)

45 VMQ 40 in.lb. (4.55 Nm)

All parts must be thoroughlyclean and kept clean duringinspection and assembly.

1. Remove the shaft seal(s), O-rings, back-up rings and sealpack subassemblies. Use a newseal kit for reassembly. Refer tothe VMQ parts catalog for kitnumbers.

2. If the pump hasdemonstrated poor performanceor loud noise, the cartridge kit must be replaced. Theseproblems were a result of a poorsystem condition. Check inletconditions, fluid cleanliness, andother system components thatmay be faulty before installation

of a new cartridge kit.

NOTE:Pre-assembled replacementcartridge kits are available. If the old cartridge is wornextensively, a new kit should be used.

3. Rotate the bearing whileapplying pressure to check forwear, looseness and pitted orcracked races.

4. Inspect seal and bushingmating surfaces on shaft forscoring or wear. Replace the shaft if marks cannot beremoved by light polishing.


Section VI —Overhaul (cont.)

Figure 13

Figure 14

Figure 15

Figure 16

C. Drive Reversal (cont.)

D. Inspection and Repair

TABLE 8. CARTRIDGE KIT BUSHING LOCATIONS AND KIT ROTATION SETUP

(location of bushing in cartridge kit, assuming a right hand rotation shaft)R = right hand rotation kit L = left hand rotation kitPump Shaft End Kit Center Kit Cover End Kit25, 35, 45 Single Inlet Plate (R) — —& Thru-Drive (R)2525 Double (R) No Bushing (R) — Outlet plate (L)3525 Double (R) Inlet Plate (R) — No Bushing (L)4525 Double (R) Inlet Plate (R) — No Bushing (L)4535 Double (R) Inlet Plate (R) — No Bushing (L)352525 Triple (R) Inlet Plate (R) No Bushing (L) Outlet Plate (L)453525 Triple (R) Inlet Plate (R) Outlet Plate (L) No Bushing (L)*Note: The opposite rotating kits would be used in a (L) pump.


Section VI —Overhaul (cont.)

E. Assembly

Basic pump: Clamp the bodyin a vise or place on 2 x 4wood blocks to facilitateassembly. See figures 10 and 11.

1. Lubricate primary shaft sealwith petroleum jelly and placein position within the body,garter spring up. See Figure 6for seal arrangements.

2. Press the seal into the bodyuntil it bottoms out.

NOTE:Two shaft seal arrangementsare available in the VMQ pumpseries. See Figure 6 and Table1 – 3. If the pump model code (Table 1–3) indicates that a secondary seal is required,perform the following step.

3. Lubricate secondary sealwith petroleum jelly and placethe seal in position opposite ofthe seal previously installed inthe body (Figure 6). Use asmall hardwood block to drive the seal into the body.Installation is complete whenthe seal face is flush with thefront of the body. Do not drivethe seal past flush as it canblock the body drain opening.

NOTE:If shaft bearing was defective,install a new bearing asfollows:

4. Press shaft into the newbearing with an arbor presswhile supporting the bearinginner race. Install a small snapring behind the bearing.

5. Use a “bullet” or plastictape over the end to preventdamage to the seal(s).Lubricate the “bullet” withpetroleum jelly and carefullypush the shaft through theseal(s) until the bearing iswithin the body. Install thelarge spiralox ring into the body

snap ring groove behind thebearing.

6. Install the O-rings and back-up ring on the cartridge outletsupport plate hub.

7. Check the rotor for bind byinserting your index fingerthrough the shaft opening ofinlet support plate. Hold thecartridge kit in a horizontalshaft position and lift the rotorwith your finger. The rotorshould move freely back andforth within the cartridge. If therotor binds, open the kit, cleanand stone all possible areas ofbind, then reassemble usingthe aforementioned procedure.The rotor must move freelywithin the cartridge whenassembled.

8. Carefully install the cartridgeinto the body so the torque pinin the cartridge kit lines up withthe hole in the cover housing.The kit should always beoriented so the inlet windowsof the kit line up with the inletport of the housing.

NOTE:VMQ Cartridge kits aremanufactured with shaftbushings located in the inletplate or outlet plate dependingon the configuration of thepump. See Table 8 forapplication details.

9. Lubricate and install thehousing O-rings.

10. Install the cover housing inposition; move back and forthuntil the cartridge pin dropsinto the cover hole.

11. Oil and install the housingbolts. Torque to the value notedin Figure 9.

12. Turn the pump shaft byhand to verify freedom of the cartridge.

Figure 17

Figure 18

Figure 19

Figure 20

© 2002 Eaton CorporationAll rights reserved Printed in USADocument No. V-PUVN-TS001-ESupercedes V-PV-TR-0001-E October 2002

Eaton14615 Lone Oak RoadEden Prairie, MN 55344USATel: 952 937-9800Fax: 952 974-7722www.hydraulics.eaton.com

Eaton46 New Lane, HavantHampshire PO9 2NBEnglandTel: (44) 23 92 486 451Fax: (44) 23 92 487 110

Eaton20 Rosamond RoadFootscrayVictoria 3011AustraliaTel: (61) 3 9319 8222Fax: (61) 3 9318 5714

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