Komatsu PC22MR-3, Operation & Maintenance Manual

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MAINTENANCE
MAINTENANCE PROCEDURES
4-59
MAINTENANCE EVERY 1000 HOURS OF OPERATION 4
Carry out these operations together with those to be performed every 500 HOURS.
CHANGING THE HYDRAULIC OIL FILTER 4
WARNING
q
Soon after the machine has been stopped, the hydraulic oil is very hot and may cause burns; let it cool
down to 40–45° C before changing the filter.
q
The hydraulic system is under pressure; slowly loosen the filler cap to release any residual pressure.
q
Oils, filters, the coolant and the battery are considered special waste and must be collected and
disposed of according to the regulations in force.
q
On machines containing synthetic biodegradable oil type HEES , this must be changed for the first
time after the first 50 hours of operation and successively every 1000 hours.
The filter is positioned on the hydraulic system drain outlet and
i t h o l ds t h e m eta l par t i c l es t h a t c om e o ff t h e v ar i o us
components due to wear. The filter can be reached after
removing the tank cover (1) (see "TANK COVER (3-34)").
To change it, proceed as indicated below:
1. Loosen the screws (2) and remove the plate (3).
2. Slowly loosen the filler cap (F) to release any residual
pressure from the tank.
3. Remove the screws (4) that hold the filter cover (5).
4. Remove the spring (6), the valve (7), and extract the filter
cartridge (8).
5. Carefully clean the filter casing and change the cartridge
(8).
6. Reassemble the whole by proceeding in the reverse order,
making sure that the gasket (7) of the cover (5) is not
damaged and is correctly housed in its seat in the tank.
7. Extend the boom, arm and bucket cylinders completely, as
shown in the figure, and remove the filler cap (F).
Put back the cap and pressurize the tank by lowering the
equipment to the ground.
8. Put back the tank cover (1).
WEAM014500