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MAINTENANCE PROCEDURE
6.
Remove 3 bolts (1) under the rear left of the machine,
then remove the cover of the drain plug.
7.
Set the oil container under the drain plug under the
machine.
Using the handle, remove drain plug (P) and drain the oil.
Check the O-ring installed to plug (P), and if it is dam-
aged, replace the O-ring. After draining the oil, tighten
drain plug (P).
Tightening torque: 68.6 ± 9.81Nm (7 ± 1kgm, 50.6 ± 7.2
ftlb)
Take care not to get oil on yourself when you remove
drain plug (P).
8.
Loosen hose clamp (2) and remove hose (3), then loosen
bolt (4) and take out strainer (5).
9.
Remove all dust from strainer (5) and wash it in clean
diesel fuel or flushing oil. If strainer (5) is damaged,
replace it with a new part.
10. Secure strainer (5) in position with bolt (4), then install
hose (3) and secure it with hose clamp (2).
11. 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.
12. Extend the boom, arm, and bucket cylinder fully as
shown in the diagram on the right, remove the oil filler
cap, then install the cap and pressurize the inside of the
tank.
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.
13. After replacing the oil, set each control lever to the neu-
tral positionand run the engine idle at a low speed for 2 to
3 minutes, then start the normal work.
INSPECT ALTERNATOR AND STARTING MOTOR
The brush may be worn or the bearing may have run out of grease. Contact your Komatsu distributor for inspec-
tion or repair.
If the engine is started frequently, carry out inspection every 1000 hours.
4-54
MAINTENANCE
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