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MAINTENANCE
SERVICE PROCEDURE
BLEED AIR FROM HYDRAULIC CIRCUIT OF FRONT DRIVE
(HD325 only the machine of 4WD specifications)
If the hydraulic pump or motor for the front drive has been removed or installed and if the hydraulic hoses, pipes, etc.
has been disconnected, bleed air according to the following procedure.
WHEN PIPING AROUND PUMP HAS BEEN REPLACED
After the pump or its piping is replaced, if the engine is started without filling the pump case with oil, the pump may
have trouble. Accordingly, be sure to fill the case with oil according to the following procedure.
1. Loosen and remove the hose adapter (1).
2.
Supply about 2 liters (0.53 US gal) of oil through the hose.
3.
Connect the hose and supply oil to the tank up to a level a little
higher than the specified level.
WHEN PIPING AROUND MOTOR HAS BEEN REPLACED
After the motor or its piping has been replaced, its case must be filled with oil, similarly to the pump. The motor case
is filled with oil, however, if oil is supplied to the tank. Accordingly, it is not necessary to supply oil to the motor case
particularly.
Since the hydraulic circuit of the front drive is closed one. To bleed air, accordingly, supply a little more oil than the
specified quantity to the tank after the parts have been replaced.
1.
Run the engine at low idling for about 5 minutes.
2.
Then, turn on the 4WD switch and travel at a low speed (below 10 km/h (6.2 MPH)) for 10 minutes.
3. Check the oil level and adjust it to the specified level.
If the all air is not bled, abnormal pressure is generated, and it will damage the pump, motor and piping.
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