Counterbalance Valve Cartridge; Fig. 7-8: Counterbalance Valve Cartridges, Frame Tilt Cylinder - JLG Lull 1044C-54 II Series Service Manual

Counterbalance Valve Cartridge

Releasing Pressure in Cylinder
Removal and Service, Counterbalance Valve
Installation, Counterbalance Valve
31200079
Manifold Block
Counterbalance Valve
Cartridge

Fig. 7-8: Counterbalance Valve Cartridges, Frame Tilt Cylinder

WARNING: The counterbalance valve cartridges trap hydraulic pressure
in the frame tilt cylinder. Wear proper eye and hand protection
when removing counterbalance valve cartridges. Hydraulic
fluid under pressure can be injected under skin or into eyes,
resulting in serious personal injury or death.
The following procedures refer to Fig. 7-8.
1. Place socket wrench over a counterbalance valve cartridge. Wrap a
clean shop rag around the socket to cover the area of the

counterbalance valve cartridge.

2. Carefully and slowly, turn cartridge out of manifold block to release
pressure in cylinder. Repeat for other cartridge to release pressure
from other end of cylinder.
3. After pressure has been released, tighten cartridges. If cartridges will
not be removed, then torque counterbalance valve cartridges to
30–35 ft-lbs.
1. Remove both cartridges and cap ports in manifold block. Inspect
cartridge O-rings for condition and replace as necessary.
2. Do not disassemble the cartridge. Service to a counterbalance valve
cartridge is limited to installing a new O-ring and replacing the entire
cartridge.
1. Lubricate O-rings with clean hydraulic oil.
2. Install each cartridge in manifold block and torque to 30–35 ft-lbs.
Counterbalance Valve
Cartridge
Frame Tilt and Oscillation
7-15