Section E - Hydraulics
Problem Solving
Hydrostatic Transmission
E-64 E-64
9803-9340-8
Checking Motor Leakage Rate (2WD)
If the motor speed is low and the pump output is normal,
the cause could be excessive internal wear in the motor
which would result in high leakage of oil into the motor
casing. By measuring the amount of oil leaking from the
motor casing back to tank, it is possible to determine if the
motor is worn.
1 Stop the engine.
2 Connect a flow meter into the motor drain hose A on
the motor.
3 Install a 0 - 400 bar (0 - 6000 lb/in
2
, 0 - 422 kg/cm
2
)
pressure gauge into the appropriate point on the
pump to measure the pressure generated in the
motor feed line (see next page for pressure test
points).
4 Start the engine and drive the machine forward
against a solid, immovable object as shown at B.
Keep the shovel level during this operation. Measure
the amount of oil expelled from the motor during one
minute’s operation.
At the maximum pressure of 260 bar (3770 lbf/in
2
) the
normal oil leakage should be approx. 19 l/min (4.2 UK gal/
min, 5 US gal/min).
If the flow rate is higher than normal, the motor should be
dismantled for repair.
707300-1
Fig 4.
708191-1
Fig 5.
ß
Þ
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