MAINTENANCE PROCEDURE MAINTENANCE
4-70
EVERY 5000 HOURS MAINTENANCE 4
Carry out the periodic maintenance work of every 100, 250, 500 and 1000 hours of operation at the same time.
CHANGE OIL IN HYDRAULIC TANK 4
WARNING
q The parts and oil are at high temperature 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
(4-18)“ when carrying out maintenance.
q Refill oil amount: 19 liters
q Prepare a handle (for the socket wrench).
1. Swing so that the drain plug at the bottom of the hydraulic
tank is 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 safety lock lever to the LOCK position and stop the
engine.
4. Remove the cover over the hydraulic tank and remove the
cap of oil filler (F).
5. Set a container direct under the drain plug located on the
machine's underside to catch oil that is drained. Remove
drain plug (P) and drain the oil. Check an O-ring installed to
Plug (P), and if it has a scratch or damage, replace it with
new one. After draining the oil, tighten drain plug (P).
q The specified tightening torque is 68.6 ± 9.81 N·m (7 ±
1 kgf·m)
q Take care not to get oil on yourself when you remove
drain plug (P).
6. Add the specified amount of new and clean engine oil (for
hydraulic system) through oil filler port (F). Check that the
oil level is between H and L on the sight gauge.
For details of oil level check, see “Check Oil Level in
Hydraulic Tank, Add Oil (3-62)“.
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