SECTION 29 - HYDROSTATIC TRANSMISSION
29-24
The following pump ports control direction of
motor (tire) rotation forward or reverse.
Front pump controls right motor:
1 - Forward (bottom)
2 - Reverse (top)
Rear pump controls left motor:
3 - Forward (bottom)
4 - Reverse (top)
IMPORTANT: Check and make sure the flowmeter is
connected properly, so when the pump is stroked the
flow from the pump goes to the motor and to the inlet
side of the flowmeter.
IMPORTANT: Check the hydraulic oil level and add
if required to insure sufficient oil for the test.
9. Using the EIC or a photo tach, set the engine
speed to 2900 RPM.
10. Stroke the control lever for the direction to be
tested and take a free flow pressure reading and
record.
CAUTION
Always stay clear of moving parts during testing
or serious injury could occur.
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11. Turn the pressure regulator valve, 1, in on the
flowmeter until a pressure reading of 136 bar
(2000 PSI) is obtained and record.
12. Motor efficiency specifications:
When figuring the motor efficiency, it should not
be less than 80%. The motor free flow should not
be less than 81 LPM (21.2 GPM).
a. Motor flow recorded at 136 bar (2000 PSI)
divided by the free flow reading at zero pressure
will determine the motor efficiency.
EXAMPLE:
Motor free flow - 25.5
Motor flow at 2000 PSI - 22.6
= 0.886 or 89
25.5
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