JLG 680S, Service And Maintenance Manual

Page: 328 / 530

SECTION 4 - BOOM & PLATFORM
4-64 3121234
Installing Counterbalance Valve
Refer to Figure 4-24., Rotator Counterbalance Valve.
1. Make sure the surface of the actuator is clean, free of any
contamination and foreign debris including old JLG
Threadlocker.
2. Make sure the new valve has the o-rings in the counter-
bores of the valve to seal it to the actuator housing.
3. The bolts that come with the valve are grade 8 bolts.
New bolts should be installed with a new valve. JLG
Threadlocker P/N 0100011 should be applied to the
shank of the three bolts at the time of installation.
4. Torque the 1/4 in. bolts 110 to 120 in. lbs. (12.4 to
13.5 Nm). Do not torque over 125 in. lbs. (14.1 Nm).
Torque the 5/16 in. bolts 140 in. lbs. (15.8 Nm). Do not
torque over 145 in. lbs. (16.3 Nm).
Figure 4-24. Rotator Counterbalance Valve