JLG Lull 1044C-54 II Series Service Manual page 315

Rear Oscillation Lock Cylinder Removed from Machine
31200079
5. Place a suitable drip pan under rear oscillation lock cylinder.
WARNING: Residual hydraulic pressure may be trapped in rear oscillation
lock cylinder. Wear proper eye and hand protection when
releasing pressure from cylinder. Hydraulic fluid under
pressure can be injected under skin or into eyes, resulting in
serious personal injury or death.
6. Slowly loosen each check valve cartridge (Item 5) on control block
(labeled 3.1 and 3.2) to allow residual pressure to escape. After
pressure has been released, tighten check valves. If control block
(Item 6) will not be overhauled, torque check valves to 45–50 ft-lbs.
7. For models with control manifold hydraulics, disconnect electrical
connection (Item 9) at oscillation control block.
8. Tag and disconnect three (5) hydraulic hoses (Items 1 and 2) from the
fittings at the oscillation control block. Cap hoses and fittings.
9. Remove three (3) capscrews (Item 3) and lockwashers (Item 4)
securing control block to cylinder (Item 8). Remove control block.
10. Plug ports in cylinder.
(Ref. Fig. 7-20) Use the following control block removal procedures when
the rear oscillation lock cylinder is removed from the machine. For removal
procedures when the cylinder is installed on the machine, see page 7-32.
1. Support cylinder in a vice. Place a suitable pan or tray under cylinder.
WARNING: Residual hydraulic pressure may be trapped in rear oscillation
lock cylinder. Wear proper eye and hand protection when
releasing pressure from cylinder. Hydraulic fluid under
pressure can be injected under skin or into eyes, resulting in
serious personal injury or death.
2. Slowly loosen each check valve cartridge (Item 5) on control block
(labeled 3.1 and 3.2) to allow residual pressure to escape. After
pressure has been released, tighten check valves. If control block
(Item 6) will not be overhauled, torque check valves to 45–50 ft-lbs.
3. Remove three (3) capscrews (Item 3) and lockwashers (Item 4)
securing control block to cylinder. Remove control block.
Frame Tilt and Oscillation
7-33