Komatsu PC138US-11 Operation & Maintenance Manual page 393

Hydraulic excavator
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MAINTENANCE
3.
Set the lock lever to LOCK position (L) and stop the en-
gine.
4.
Remove the bolts (1) (4 pieces), and remove the hydraulic
tank top cover (2).
5.
Remove the cap of oil filler port (F).
6.
Remove the undercover (3).
7.
Place the oil container under the drain plug (P1) at the bot-
tom of the machine.
8.
Remove the drain plug (P1), and drain the oil.
When removing the drain plug (P1), be careful not to
get oil on yourself. Check the installed O-ring for dam-
age. Replace the O-ring with a new one if necessary.
9.
After draining the oil, tighten the drain plug (P1).
Tightening torque: 35 to 63 Nm
10. Install the undercover (3).
11. Place the oil container under the drain plug (P2) at the bot-
tom of the machine.
WENAM00111
MAINTENANCE PROCEDURE
4-77

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