Komatsu WA800-3E0, Operation & Maintenance Manual

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SERVICE PROCEDURE
MAINTENANCE
4-72
CLEAN HYDRAULIC TANK STRAINER 4
When changing the oil in the hydraulic tank, drain the oil from the tank and clean the strainer.
1. Loosen bolts (1) and (3), then remove covers (2) and (4).
2. Loosen bolt (5), remove strainer cover (6), then remove
strainer (8) together with spring (7).
3. Remove any dirt from strainer (8), then wash in clean light
oil or flushing oil.
If strainer (8) is broken, replace it with a new part.
4. Install spring (7), strainer (8), and cover (6). When doing
this, look through the mounting hole of cover (4) to check
that the strainer guide pin is fitted in the guide hole.
When installing cover (6), coat the thread of bolt (5) with
thread tightener (LT-2) to prevent it from coming loose. If
bolt (5) becomes loose and drops out, it will be sucked into
the piston pump and will damage the pump.
Tightening torque of bolt (5):
53.7 to 122.3 Nm (5.5 to 12.5 kgm)
5. Install covers (2) and (4).
Replace the O-rings of the covers with new parts.