Komatsu PC290LC-11 Operation & Maintenance Manual page 450

HANDLE MACHINE READY FOR INSTALLATION OF ATTACHMENT
6.
Operate each work equipment control lever and attach-
ment control pedal fully to the front, rear, right, and left a
few times within 15 seconds to release the internal pres-
sure in the hydraulic circuit.
7.
Set the lock lever to LOCK position (L).
8.
Loosen oil filler cap (F) slowly on the top of the hydraulic
tank to release the internal pressure in the hydraulic tank.
9.
Check that the hydraulic oil temperature is low.
10. Remove the plugs (2 places) at the outlet and inlet.
Be careful not to get any dirt or mud on the hose fitting.
If an O-ring is damaged, replace it with a new one.
11. Connect the hose on the attachment side.
Check the direction of flow of the oil and be careful not to
make any mistake.
6-24
ATTACHMENTS AND OPTIONS