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Offset Single Reduction Gear Reducers

reducer_c_size.jpg

Performance Range
Gear Ratio Range 1.87:1 to 7.95:1
Output Speeds (1750 RPM Input) 950 to 220 RPM
Horsepower Range 1.4 to 49.8 HP (1.0 to 37.2 kW)

Design Features

Viking offers three sizes of helical gear reducers to reduce standard driver speeds to match pump (or other driven equipment) requirements.  Adjustment slots on the mounting brackets allow the reducers input (high speed) shaft height to swivel to adapt to a variety of motor frames, while the output (slow speed) shaft height corresponds to typical Viking Pump shaft heights.

Viking "A" Size Helical Reducer Ratio, Speed and Horsepower Table

High Speed Input Shaft RPM Viking Gear Reducer Ratios "A" Size  
2.24:1 2.76:1 3.43:1 4.17:1
1750 780 640 520 420 Low Speed Shaft RPM
6.1 / 4.6 4.9 / 3.7 3.8 / 2.8 3.1 / 2.3 Maximum HP/KW
1450 640 520 420 350 Low Speed Shaft RPM
5.2 / 3.9 4.2 / 3.1 3.2 / 2.4 2.7 / 2.0 Maximum HP/KW
1150 520 420 350 280 Low Speed Shaft RPM
4.3 / 3.2 3.4 / 2.5 2.6 / 1.9 2.2 / 1.6 Maximum HP/KW
950 420 350 280 230 Low Speed Shaft RPM
3.6 / 2.7 2.9 / 2.2 2.2 / 1.6 1.8 / 1.3 Maximum HP/KW
870 390 320 260 210 Low Speed Shaft RPM
3.3 / 2.5 2.7 / 2.0 2.0 / 1.5 1.7 / 1.3 Maximum HP/KW
720 320 260 210 175 Low Speed Shaft RPM
2.8 / 2.1 2.2 / 1.6 1.7 / 1.3 1.4 / 1.0 Maximum HP/KW

Viking "B" Size Helical Reducer Ratio, Speed and Horsepower Table

High Speed Input Shaft RPM Viking Gear Reducer Ratios "B" Size  
1.87:1 2.24:1 2.76:1 3.40:1 4.19:1 5.06:1 6.27:1 7.65:1
1750 950 780 640 520 420 350 280 230 Low Speed Shaft RPM
19.0 / 14.2 17.0 / 12.7 15.0 / 11.2 13.0 / 9.7 11.0 / 8.2 9.5 / 7.1 7.6 / 5.7 6.4 / 4.8 Maximum HP/KW
1450 780 640 520 420 350 280 230 190 Low Speed Shaft RPM
17.3 / 12.9 15 .5 / 11.6 13.4 / 10.0 11. 6 / 8.7 9.9 / 7.4 8.5 / 6.3 6.4 / 4.8 5.4 / 4.0 Maximum HP/KW
1150 640 520 420 350 280 230 190 155 Low Speed Shaft RPM
16.5 / 12.3 14.0 / 10.4 11.6 / 8.7 10.1 / 7.5 8.5 / 6.3 7.3 / 5.4 5.3 / 4.0 4.4 / 3.3 Maximum HP/KW
950 520 420 350 280 230 190 155 125 Low Speed Shaft RPM
15.5 / 11.6 12.8 / 9.5 10.1 / 7.5 9.0 / 6.7 7.6 / 5.7 6.0 / 4.5 4.3 / 3.2 3.7 / 2.8 Maximum HP/KW
870 470 390 320 260 210 175 140 115 Low Speed Shaft RPM
13.7 / 10.2 11.3 / 8.4 9.3 / 6.9 8.5 / 6.3 7.2 / 5.4 5.6 / 4.2 4.0 / 3.0 3.4 / 2.5 Maximum HP/KW
720 390 320 260 210 175 140 115 95 Low Speed Shaft RPM
11.7 / 8.7 9.6 / 7.2 7.8 / 5.8 7.5 / 5.6 6.1 / 4.6 4.7 / 3.5 3.4 / 2.5 2.8 / 2.1 Maximum HP/KW

Viking "C" Size Helical Reducer Ratio, Speed and Horsepower Table

High Speed Input Shaft RPM Viking Gear Reducer Ratios "C" Size  
2.21:1 2.80:1 3.31:1 4.21:1 5.08:1 6.24:1 7.95:1
1750 780 640 520 420 350 280 220 Low Speed Shaft RPM
49.8 / 37.2 43.5 / 32.5 39.0 / 29.1 32.4 / 24.2 26.6 / 19.8 19.7 / 14.7 18.0 / 13.4 Maximum HP/KW
1450 640 520 420 350 280 230 180 Low Speed Shaft RPM
45.3 / 33.8 36.6 / 27.3 32.8 / 24.6 27.2 / 20.3 22.3 / 16.6 16.7 / 12.5 15.2 / 11.3 Maximum HP/KW
1150 520 420 350 280 230 190 145 Low Speed Shaft RPM
40.1 / 29.9 30.0 / 22.4 26.8 / 20.0 22.2 / 16.6 18.2 / 13.6 13.8 / 10.3 12.6 / 9.4 Maximum HP/KW
950 420 350 280 230 190 155 120 Low Speed Shaft RPM
29.1 / 21.7 24.7 / 18.4 22.1 / 16.5 18.3 / 13.7 15.0 / 11.2 11.4 / 8.5 10.4 / 7.8 Maximum HP/KW
870 400 320 260 215 175 140 110 Low Speed Shaft RPM
28.4 / 21.2 22.7 / 16.9 20.3 / 15.1 16.8 / 12.5 13.8 / 10.3 10.6 / 7.9 9.6 / 7.2 Maximum HP/KW
720 330 260 215 175 140 115 90 Low Speed Shaft RPM
24.1 / 18.0 19.0 / 14.2 17.0 / 12.7 14.1 / 10.5 11.5 / 8.6 8.9 / 6.6 8.1 / 6.0 Maximum HP/KW

Service Factor Table

Multiply the actual horsepower (KW) requirement of the application times the appropriate service factor, and ensure that this number is less than the maximum HP/KW rating of the reducer that best matches your speed requirements.
POWER SOURCE (1,3) DRIVEN LOAD CLASSIFICATION (2,3) INTERMITTENT (UP TO 3 HOURS PER DAY) 8 TO 10 HOURS PER DAY 24 HOURS PER DAY
Electric Motor, Steam Turbine or Hydraulic Motor Uniform 0.8 1.0 1.25
Moderate Shock 1.0 1.25 1.5
Heavy Shock 1.5 1.75 2.0
Multi-Cylinder Internal Combustion Engine Uniform 1.0 1.25 1.5
Moderate Shock 1.25 1.5 1.75
Heavy Shock 1.75 2.0 2.25
1. For applications driven by single cylinder engines, contact factory for other service factors.
2. Rotary Pump applications are classified as Uniform Loads
3. Use of belt or chain drives to reducer input or output shaft is not recommended.

Driven Load Classifications (excerpted from AGMA Information Sheet 922-A96 (©1996)

Key: U=Uniform Load, M=Moderate Shock, H=Heavy Shock

APPLICATION LOAD CLASSIFI-CATION APPLICATION LOAD CLASSIFI-CATION
Pumps, Rotary & Centrifugal U Fans, Cooling Tower M
Pumps, Reciprocating M Feeders, Apron, Belt, Screw U
Agitators U Feeders, Reciprocating M
Blowers U Generators U
Compressors, Cent. & Lobe U Hammer Mills M
Compressors, Reciprocating M Machine Tools M
Cranes and Hoists M Mills, Rotary M
Crushers, Ore & Stone H Mixers, Concrete, Drum Type M
Elevators M Printing Presses U
Fans, Centrifugal, Forced Draft U Sewage Disposal Bar Screens U

Reducer Mounting Options and Weights

Fits Reducer Output Shaft Center Height (in.) Input Shaft Center Height Min/Max (in.) Bracket Weight Reducer Weight
KG Lbs. KG Lbs.
A 3-1/2 0.62 / 6.38 2.7 6 9.5 21
B 4-5/8 1.25 / 8.0 4.1 9 16.8 37
B 5-1/2 2.12 / 8.88 4.5 10
B 7 3.62 / 10.38 5.0 11
C 7-3/4 2.5 / 13 8.6 19 42.6 94
C 9-1/2 4.25 / 14.75 10.9 24

Shaft Center Height for Common Viking Pumps

Pump Size Shaft Centerline Height (inches)
Gen. Purpose Series 32, 432, 34, 434 Heavy Duty Series 125, 4125, 225, 4225, 335, 4335, 123, 4123, 333, 4333, 127, 4127, 337, 4337, 724, 4724, 124A, 4124A, 126A, 4126A, 123A, 4123A, 127A, 4127A, 827, 823, 825
C, F, FH 1-5/8  
G, GG 2-3/4 2-3/4 (G724 & G4724 are 2")
H, HJ, HL 2-3/4 3-1/2
AS, AK, AL   5-1/4
J 4-5/8  
K,KK 4-5/8 5-1/2
L, LQ, LL, LS 6 7
Q, QS 7-3/4 8-3/4
M 9-1/2 10
N 9-1/2 9-1/2
R   13-1/4

 

 

 

 

 

 

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