JLG 660AJ Service Manual - Manual (Page 167)

SECTION 4 - BOOM & PLATFORM
3121616 – JLG Lift – 4-19
Installing Counterbalance Valve
Refer to Figure 4-7., Rotator Counterbalance Valve.
1. Make sure surface of actuator is clean and free of any
contamination and debris, including old Loctite.
2. Make sure new valve has the O-rings in counterbores of
valve to seal it to the actuator housing.
3. Bolts that come with valve are Grade 8 bolts. Install new
bolts with a new valve. Apply Loctite #242 to shanks of
the three bolts at time of installation.
4. Torque 1/4-inch bolts 110-120 in-lb (12.4-13.5 Nm). Do
not torque over 125 in-lb (14.1 Nm). Torque 5/16-inch
bolts to 140 in-lb (15.8 Nm). Do not torque over 145 in-lb
(16.3 Nm).
Figure 4-7. Rotator Counterbalance Valve