JLG G12-55A Service Manual - Manual (Page 126)

Hydraulic System
8-6 G10-55A, G12-55A
21. The relief on the (B) port of the main control valve is
non-adjustable and must be replaced. Replace and
repeat steps 17 and 18.
22. Verify pressure is correct.
23. Shut engine OFF.
24. Slowly remove the gauge, line and tee fitting from
the compensation cylinder (1 and 2). Reinstall each
hose and torque as required.
25. Install any previously removed attachment.
MY7060
B