Komatsu PC138USLC Operation & Maintenance Manual page 357

MACHINE READY FOR ATTACHMENT MACHINE READY FOR ATTACHMENT
6. Remove cover (1) at the top surface of the hydraulic tank, then
slowly loosen oil filler cap (F) to release the internal pressure.
7. After checking that the oil temperature is low, remove the covers from the inlet port and outlet port (2 places).
Be careful that no dirt or mud is stuck to the hose mouthpiece.
If the O-ring is damaged, replace it with a new part.
8. Connect the hose at the attachment side.
When doing this, check the direction of flow of the oil and be careful not to make any mistake.
9. Set the rotor of the stop valve installed to the inlet port on the
side face of the arm and the outlet port piping to FREE position
(a).
(a) FREE: Hydraulic oil flows (direction of arrow is parallel to
long direction of arm)
(b) LOCK: Hydraulic oil does not flow (direction of arrow is at
right angles to long direction of arm)
When setting the FREE or LOCK position of the stop valve
rotor, remove bolt (2), turn over plate (1), then turn the rotor.
After setting, install plate (1) again with bolt (2).
10. After installing the attachment, check the oil level in the hydraulic tank.
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ATTACHMENTS AND OPTIONS ATTACHMENTS AND OPTIONS