Komatsu PC450-8, Operation & Maintenance Manual

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MAINTENANCE PROCEDURE
MAINTENANCE
4-82
EVERY 5000 HOURS MAINTENANCE 4
Maintenance for every 50, 250, 500 and 1000 hours service should be carried out at the same time.
CHANGE OIL IN HYDRAULIC TANK 4
WARNING
q
The parts and oil are at high temperature immediately after the engine is stopped, and may cause
burns. Wait for the temperature to go down before starting the work.
q
When removing the oil filler cap, turn it slowly to release the internal pressure, then remove it.
NOTICE
If the machine is equipped with a hydraulic breaker, the hydraulic oil will deteriorate much faster than dur-
ing normal bucket operations. For details, see “MAINTENANCE INTERVAL FOR HYDRAULIC BREAKER
(4-19)“ when carrying out maintenance.
q
Refill capacity: 248 liters
q
Prepare a handle (for the socket wrench).
1. Swing the upper structure so that hydraulic tank drain plug
(P) and drain plug (A) at the bottom of the pump suction
tube are in the middle between the left and right tracks.
2. Retract the arm and bucket cylinders, then lower the boom
and put the teeth in contact with the ground.
3. Set the lock lever to the LOCK position and stop the
engine.
4. Remove the cap of oil filler port (F) at the top of the hydrau-
lic tank.
5. Remove the undercover(1) and (2).
6. Set the oil container under the drain plug under the
machine. Using the handle, remove drain plug (P), (A) and
drain the oil. Check the O-ring installed to plug (P), (A), and
if it is damaged, replace the O-ring. After draining the oil,
tighten drain plug (P), (A).
q
Tightening torque of drain plug (P) and (A)
58.8 to 78.5 Nm (6 to 8 kgm)
q
When removing drain plug (P), (A), be careful not to
get oil on yourself.