Komatsu PC15MRX-1 Operation And Maintenance Manual page 185

MAINTENANCE
3. Remove the cap from oil filler (F), and release the internal
pressure.
4. Loosen the clamp of hose (1), then loosen 4 bolts.
5. Take out element assembly (2).
6. Using a filter wrench, turn filter cartridge (3) to the left to
remove it.
7. Clean the filter holder, then coat of the seal surface of the
new filter cartridge with engine oil (or coat it thinly with
grease).
8. When installing, bring the packing surface into contact
with the seal surface of the filter holder, then tighten a
further 1/2 - 3/4 turns.
NOTICE
Be sure to pressurize the hydraulic tank. If it is not pres-
surized, the pump will suck in air, and this will adversely
affect the equipment.
9. Leave hydraulic tank cap (F) removed, and extend the
boom, arm, and bucket cylinders fully as shown in the
diagram on the right. Then install the cap and pressurize
the inside of the tank.
10. Install cover.
MAINTENANCE PROCEDURE
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