Komatsu PC138US-11 Operation & Maintenance Manual page 422

HANDLE MACHINE READY FOR INSTALLATION OF ATTACHMENT
6.
Turn the starting switch to OFF position (A).
7.
Remove the bolts (1) (4 pieces), and open hydraulic tank
top cover (2).
8.
Remove the cap of oil filler port (F) gradually to release the
internal pressure.
9.
Remove the cap of oil filler port (F).
10. Check that the hydraulic oil temperature is low.
11. Set the rotor of the stop valve installed to the piping for the
inlet port and the outlet port on the side face of the arm to
LOCK position (b).
(a) FREE: Hydraulic oil flows (direction of arrow is parallel
to longitudinal direction of arm)
(b) LOCK: Hydraulic oil does not flow (direction of arrow is
at right angle to longitudinal direction of arm)
Perform the FREE or LOCK setting of the stop valve rotor
according to the following procedure.
1)
Remove the bolt (3).
2)
Invert the plate (4), turn the rotor, and set it to FREE
or LOCK position.
3)
Install the plate (4) with bolt (3).
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ATTACHMENTS AND OPTIONS