RANGER Helical Gear Reducersrangerpumps.com/Documents/RangerGearReducersBulletin.pdf · Series V • RANGER, Inc., Helical Gear Reducers Sizes “A,” “B,” and “C” Printed

Series V • RANGER, Inc., Helical Gear ReducersSizes “A,” “B,” and “C”

Printed in U.S.A., permission

FEATURES

RANGER Helical Gear Reducers

Gear Ratio Range: 1.87:1 to 7.95:1

Output Speeds (with 1750 RPM Input): 950 to 220 RPM

Reducer Horsepower Range: 1.4 to 49.8 HP (1.0 to 37.2 kW)

Three sizesRANGER’s helical gear reducers are available in three basic sizes, each size offering several gear ratios.

“A” Size Reducer “B” Size Reducer “C” Size Reducer(mounting bracket on input side) (mounting bracket on output side) (mounting bracket on output side)

Universal mountingEach size has one or more mounting brackets for various center heights. Adjustmentslots on the brackets allow you to swivel the reducer’s input (high speed) shaft height toadapt to a variety of motors or other prime movers. These mounting brackets assure noradial load on the reducer, drive or driven shafts.

Simple, robust designAll ratios are fully interchangeable in each gearbox. All three reducers contain ahardened steel pinion and gear supported by precision ball bearings.



Selecting the correct RANGER Helical Gear Reducer1. Determine the actual horsepower requirements of the application from the pump curve or specifications for other driven

equipment.

2. Determine “equivalent horsepower” for the application by multiplying the actual horsepower to be transmitted by theappropriate service factor, which can be obtained in the Service Factor Table on page 3. This service factor takes intoaccount the length of service per day, the load classification (uniform, moderate shock, heavy shock), and the type ofdrive. A table of driven load classifications is included to help you determine the service factor to use.

3. Find the Reducer Horsepower from the Tables on pages 3 and 4 the reducer which most closely matches your speedrequirements. Make sure the equivalent horsepower (kW) for a given input speed and ratio is less than or equal to themaximum recommended horsepower (kW) shown in the chart on the “MAXIMUM REDUCER HP / KW” lines.

Example:

A RANGER Series 22 Pump requires 10.1 HP input at 520 rpm to deliver the desired output of 115 gpm at 110 psi on3000 SSU fluid (from the pump curve), and is driven 24 hours per day. Using the Service Factor table, multiply the servicefactor (in this case, 1.25) times the horsepower required (10.1 HP) for a reducer horsepower requirement of 12.6 HP.

Looking at the Specifications Table, using a 1750 rpm motor, the desired 520 RPM output speed requires a reducer gearratio of about 3.4:1. Reviewing the Horsepower tables, the “A” size reducer’s Maximum Reducer HP at 3.8 is insufficient. The“B” size reducer offers a Maximum Reducer HP of 13 HP, which exceeds the 12.6 HP required, so select the “B” reducer with3.40:1 ratio, P/N 2V-340B.

Check that the driver shaft height is within the min/max input shaft height range (2.12" to 8.88") of this reducer bracket.The selected driver, a 254T frame motor with 6.25" shaft height, is within the allowable range. Shims are required for theRANGER pump base mounting.

Specifications for Helical Gear Reducers and BracketsOUTPUT SPEED

Approx. RANGER Shaft Center Approx.RANGER @ 950 @ 1450 @ 1150 @ 1750 Shipping Reducer Center Height Shipping

Reducer Reducer Gear RPM RPM RPM RPM Weight Bracket Height Min/Max WeightSize Part No. Ratio Input Input Input Input (lbs./Kg) Part No. (In.) (In.) (lbs./Kg)

2V - 224A 2.24 to 1 420 640 520 780

2V - 276A 2.76 to 1 350 520 420 64021 / 9.5 274G-35A 3-1/2

0.62 /6 / 2.7A 2V - 343A 3.43 to 1 280 420 350 520

6.38

2V - 417A 4.17 to 1 230 350 280 420

2V - 187B 1.87 to 1 520 780 640 950274G-46B 1.25 /

2V - 224B 2.24 to 1 420 640 520 7804-5/8 8.0 9 / 4.1

2V - 276B 2.76 to 1 350 520 420 640

2V - 340B 3.40 to 1 280 420 350 520274G-55B 2.12 /B 2V - 419B 4.19 to 1 230 350 280 420

37 / 16.8 5-1/28.88

10 / 4.5

2V - 506B 5.06 to 1 190 280 230 350

2V - 627B 6.27 to 1 155 230 190 280274G-70B 3.62 /

2V - 765B 7.65 to 1 125 190 155 2307 10.38 11 / 5.0

2V - 221C 2.21 to 1 420 640 520 780

2V - 280C 2.80 to 1 350 520 420 640274G-78C

2V - 331C 3.31 to 1 280 420 350 5207-3/4 2.5 / 13 19 / 8.6

2V - 421C 4.21 to 1 230 350 280 420 94 / 42.6

C 2V - 508C 5.08 to 1 190 280 230 350274G-95C 4.25 /

2V - 624C 6.24 to 1 155 230 190 2809-1/2 14.75 24 / 10.9

2V - 795C 7.95 to 1 120 185 145 220

1. Any “B” size reducer bracket may be used with any “B” size reducer, and any “C” size reducer bracket may be used with any “C” sizereducer.

2. Shows adjustment range of input (high speed) shaft, allowing the gear reducer to be matched to various drivers. Range will change whenusing Pump or Reducer Mounting Pads.

Rev. 4/02 –2–



RANGER Size “A” Helical Reducer Horsepower TableHIGH SPEED RANGER GEAR REDUCER RATIOS “A” SIZESHAFT INPUT 2.24 2.76 3.43 4.17

RPM1 to 1 to 1 to 1 to 1

780 640 520 420 Low Speed Shaft RPM1750 6.1 4.9 3.8 3.1 Maximum Reducer HP

4.6 3.7 2.8 2.3 KW640 520 420 350 Low Speed Shaft RPM

1450 5.2 4.2 3.2 2.7 Maximum Reducer HP3.9 3.1 2.4 2.0 KW520 420 350 280 Low Speed Shaft RPM




720 2.8 2.2 1.7 1.4 Maximum Reducer HP2.1 1.6 1.3 1.0 KW

Driven Load Classifications(Excerpted from AGMA Information Sheet 922-A96 © 1996)Key: U = Uniform Load; M = Moderate Shock; H = Heavy Shock

LOAD LOADAPPLICATION CLASSIFICATION APPLICATION CLASSIFICATIONPumps, Rotary and Centrifugal U Fans, Cooling Tower MPumps, Reciprocating M Feeders, Apron, Belt, Screw UAgitators U Feeders, Reciprocating MBlowers U Generators UCompressors, Centrifugal & Lobe U Hammer Mills MCompressors, Reciprocating M Machine Tools MCranes and Hoists M Mills, Rotary MCrushers, Ore and Stone H Mixers, Concrete, Drum Type MElevators M Printing Presses UFans, Centrifugal, Forced Draft U Sewage Disposal Bar Screens U

Service Factor tablePOWER CLASSIFICATION INTERMITTENT UP TO 8 TO 10 HOURS 24 HOURSSOURCE OF DRIVEN LOAD 3 HOURS PER DAY PER DAY PER DAY

Electric Motor, Uniform 0.8 1.0 1.25Steam Turbine, or Moderate Shock 1.0 1.25 1.5Hydraulic Motor Heavy Shock 1.5 1.75 2.0

MULTI-CYLINDER Uniform 1.0 1.25 1.5Internal Moderate Shock 1.25 1.5 1.75

Combustion Engine Heavy Shock 1.75 2.0 2.25

1. For applications driven by single cylinder engines, refer to factory for other service factors.2. Rotary pump applications are classified as Uniform Loads.3. Use of belt or chain type drives to either reducer input or output shaft is not recommended.

Rev. 4/02 –3–



RANGER Size “B” Helical Reducer Horsepower TableHIGH SPEED RANGER GEAR REDUCER RATIOS “B” SIZESHAFT INPUT 1.87 2.24 2.76 3.40 4.19 5.06 6.27 7.65

RPM1 to 1 to 1 to 1 to 1 to 1 to 1 to 1 to 1

950 780 640 520 420 350 280 230 Low Speed Shaft RPM1750 19.0 17.0 15.0 13.0 11.0 9.5 7.6 6.4 Maximum Reducer HP

14.2 12.7 11.2 9.7 8.2 7.1 5.7 4.8 KW780 640 520 420 350 280 230 190 Low Speed Shaft RPM

1450 17.3 15.5 13.4 11.6 9.9 8.5 6.4 5.4 Maximum Reducer HP12.9 11.6 10.0 8.7 7.4 6.3 4.8 4.0 KW640 520 420 350 280 230 190 155 Low Speed Shaft RPM




720 11.7 9.6 7.8 7.5 6.1 4.7 3.4 2.8 Maximum Reducer HP8.7 7.2 5.8 5.6 4.6 3.5 2.5 2.1 KW

RANGER Size “C” Helical Reducer Horsepower TableHIGH SPEED RANGER GEAR REDUCER RATIOS “C” SIZESHAFT INPUT 2.21 2.80 3.31 4.21 5.08 6.24 7.95

RPM1 to 1 to 1 to 1 to 1 to 1 to 1 to 1

780 640 520 420 350 280 220 Low Speed Shaft RPM1750 49.8 43.5 39.0 32.4 26.6 19.7 18.0 Maximum Reducer HP

37.2 32.5 29.1 24.2 19.8 14.7 13.4 KW640 520 420 350 280 230 180 Low Speed Shaft RPM

1450 45.3 36.6 32.8 27.2 22.3 16.7 15.2 Maximum Reducer HP33.8 27.3 24.6 20.3 16.6 12.5 11.3 KW520 420 350 280 230 190 145 Low Speed Shaft RPM




720 24.1 19.0 17.0 14.1 11.5 8.9 8.1 Maximum Reducer HP18.0 14.2 12.7 10.5 8.6 6.6 6.0 KW

1. For input speeds higher than 1750 RPM, consult the factory.

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