JLG 450A_AJ Series II Service Manual - Manual (Page 230)

SECTION 4 - BOOM & PLATFORM
4-18 – JLG Lift – 3121290
Installing Counterbalance Valve
Refer to Figure 4-5., Rotator Counterbalance Valve.
1. Clean actuator surface of contamination and foreign
debris including old Loctite.
2. Make sure new valve has O-rings in counterbores of
valve to seal it to actuator housing.
3. Bolts that come with valve are grade 8 bolts. Install new
bolts with a new valve. Apply Loctite #242 to shank of
three bolts during installation.
4. Torque 1/4" bolts 110 to 120 in-lb (12.4 to 13.5 Nm).
Torque 5/16" bolts 140 in-lb (15.8 Nm).
Figure 4-5. Rotator Counterbalance Valve