Installing Counterbalance Valve - JLG 400S Service And Maintenance Manual

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Installing Counterbalance Valve

Refer to Figure 4-19., Rotator Counterbalance Valve.

1. Make sure the surface of the actuator is clean, free of any

contamination and foreign debris including old JLG

Threadlocker P/N 0100011.

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

Figure 4-19. Rotator Counterbalance Valve

SECTION 4 - BOOM & PLATFORM

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).

5. Make sure the valve is seated against the housing valve

flat. If it is raised up on any side or corner, remove the

valve to determine what the obstruction is. If possible,

test this using a hydraulic hand pump or electric test.