Installing Counterbalance Valve - JLG E450A Service And Maintenance Manual

Installing Counterbalance Valve

Refer to Figure 4-9., Rotator Counterbalance Valve.
1. Make sure the surface of the actuator is clean, free of any
contamination and foreign debris including old Loctite.
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
3121714
Figure 4-9. Rotator Counterbalance Valve
SECTION 4 - BOOM & PLATFORM
Threadlocker PN 0100011 should be applied to the
shank of the three bolts at the time of installation.
4. Torque the 1/4-inch 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-inch 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 hydraulic hand pump or electric test.
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