Komatsu PC1250-11 Original Instructions Manual page 380

MAINTENANCE PROCEDURE
1.
Lower the work equipment to the ground and stop the en-
gine.
2.
Turn the starting switch to ON position (B), and operate the
operating portion (g) of the lock lever to set it to FREE po-
sition (F).
3.
Operate each work equipment control lever and attach-
ment control pedal fully to the front, rear, right, and left for
2 to 3 times within 15 seconds to release the internal pres-
sure in the hydraulic circuit after operating Step 2.
4.
Operate the operating portion (g) of the lock lever to set it
securely to LOCK position (L).
5.
Loosen the oil filler cap (F) slowly on the top of the hy-
draulic tank to release the internal pressure in the hydraul-
ic tank.
6.
Place a container to catch the drained oil under the filter
element (7).
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MAINTENANCE