SECTION 29 - HYDROSTATIC TRANSMISSION
29-26
The following checks should then be performed to
trace the source of the air ingress.
– Examine the suction tubes and fittings to the
hydraulic gear pump and the return tubes from
the filter to the reservoir.
– Examine the transmission case drain
tubes/hoses and fittings from the hydraulic
motors and pumps to the suction side of the
hydraulic pump. Also check the cam plate shaft
seals and the pump and motor casing gaskets.
– Potential leakage areas could also be input shaft
seals in the engine bell housing, gearbox or
output shaft seals in motors and gearboxes and
the chain case.
– It may be necessary in some instances (where
leakage is occurring on shaft seals into
gearboxes or bell housing), to pressurize the
reservoir for 2 - 4 hours and monitor the oil level
in the gearboxes.
– If the prior checks do not locate the source of the
leak, it may be necessary to pressurize each
hydrostatic component individually.
To do this it will be necessary to disconnect each
case drain line in turn and pressurize using an air
line to a maximum pressure of 10 PSI.
NOTE: A check valve can be installed in the case
drain tube which maintains a 5 PSI pressure in the
pump and motor cases. This helps prevent air
ingress into the system.
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