Viking Pump TSM610: Offset Gear Reducers - Manual (Page 7)

SECTION TSM 610 ISSUE G PAGE 7 OF 8
1. Determine ratio to obtain desired output speed.
2. Determine actual horsepower requirements of application.
3. Determine equivalent horsepower for the application by
multiplying the actual horsepower to be transmitted by the
appropriate service factors, which can be obtained in the
Service Factor Table below.
This service factor takes into account the time length of
service per day, the load classification (uniform, moderate
shock, heavy shock), and the type of drive.
4. Refer to the recommended maximum reducer horsepower
line in the horsepower tables below and make sure the
equivalent horsepower for a given input speed and ratio
is less than or equivalent to the maximum recommended
horsepower shown in the chart.
POWER SOURCE (1) (3)
ChARACTER OF
DRIVEN LOAD (2) (3)
INTERMITTENT
UP TO 3 hRS. A DAY
8-10 hRS.
A DAY
24 hRS.
A DAY
Electric Motor,
Steam Turbine, or
Hydraulic Motor
Uniform
Moderate Shock
Heavy Shock
.8
1.0
1.5
1.0
1.25
1.75
1.25
1.5
2.0
Multi-Cylinder
Internal Combustion
Engine
Uniform
Moderate Shock
Heavy Shock
1.0
1.25
1.75
1.25
1.5
2.0
1.5
1.75
2.25
1. For applications driven by single cylinder engines, refer to factory for other service factors.
2. Rotary pump applications are considered as uniform loads.
3. Use of belt or chain type drives to either reducer input or output shaft is not recommended.
“A” Size helical Reducer horsepower Table
Part No./Ratio (3-551-049-224/2.24:1) (3-551-050-276/2.76:1) (3-551-051-343/3.43:1) (3-551-052-417/4.17:1)
“B” Size helical Reducer horsepower Table
Part No./Ratio (3-551-054-187/1.87:1) (3-551-055-224/2.24:1) (3-551-001-276/2.76:1) (3-551-002-340/3.40:1)
(3-551-003-419/4.19:1) (3-551-004-506/5.06:1) (3-551-005-627/6.27:1) (3-551-007-765/7.65:1)
hIGh SPEED
ShAFT
INPUT RPM (1)
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 17.0 15.0 13.0 11.0 9.5 7.6 6.4 MAXIMUM REDUCER HP
1450
780 640 520 420 350 280 230 190 LOW SPEED SHAFT RPM
17.3 15.5 13.4 11.6 9.9 8.5 6.4 5.4 MAXIMUM REDUCER HP
1150
640 520 420 350 280 230 190 155 LOW SPEED SHAFT RPM
16.5 14.0 11.6 10.1 8.5 7.3 5.3 4.4 MAXIMUM REDUCER HP
950
520 420 350 280 230 190 155 125 LOW SPEED SHAFT RPM
15.5 12.8 10.1 9.0 7.6 6.0 4.3 3.7 MAXIMUM REDUCER HP
1 For input speeds higher than 1750 RPM, consult the factory.
SELECTING ThE CORRECT VIkING hELICAL GEAR REDUCER
Service Factor Table
hIGh SPEED
ShAFT
INPUT RPM (1)
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 4.9 3.8 3.1 MAXIMUM REDUCER HP
1450
640 520 420 350 LOW SPEED SHAFT RPM
5.2 4.2 3.2 2.7 MAXIMUM REDUCER HP
1150
520 420 350 280 LOW SPEED SHAFT RPM
4.3 3.4 2.6 2.2 MAXIMUM REDUCER HP
950
420 350 280 230 LOW SPEED SHAFT RPM
3.6 2.9 2.2 1.8 MAXIMUM REDUCER HP
(1) For input speeds higher than 1750 RPM, consult the factory.