Lull 6K Service Manual - Manual (Page 528)

Frame Tilt and Oscillation
7-26 Service Manual — Models 644B, 6K, 844C, 8K, 1044C, 10K
(Ref. Fig. 7-17) The following steps are required to remove the rear
oscillation lock cylinder:
1. Follow preparation procedures as outlined in Section 3.
2. Place blocks between frame and top of rear axle. These will hold the
frame in place when the cylinder is removed.
3. Install brake pressure diagnostic port test gauge onto brake diagnostic
port.
4. While watching test gauge, press brake pedal numerous times until
pressure gauge reads 0 psi. Remove test gauge from diagnostic port.
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 (Item 16) on control block (labeled 3.1
and 3.2) to allow residual pressure to escape. After pressure has been
released, torque check valves to 50 ft-lbs.
7. Tag and disconnect three (3) hydraulic hoses (Items 5 and 6) at
oscillation control block. Cap hoses and fittings.
8. For models with control manifold hydraulics, disconnect wiring harness
electrical connection (Item 17) at oscillation control block.
9. Remove nut (Item 1), lockwasher (Item 2), and capscrew (Item 4)
securing cylinder upper pivot pin (Item 3) to frame.
10. Remove capscrew (Item 4), lockwasher (Item 2), and lock pin (Item 8)
securing cylinder lower pivot pin (Item 9).
11. Place a sling around cylinder (Item 15) and attach sling to suitable
lifting equipment. Make sure sling and lifting equipment have sufficient
capacity. The rear oscillation lock cylinder weighs approximately 200
pounds. Using lifting equipment, support weight of cylinder.
12. Remove upper and lower pivot pins (Items 3 and 9). Move cylinder out
and up from machine.
Installation
Rear Oscillation Lock
Cylinder (Ref. Fig. 7-17) The following steps are required to install the rear
oscillation lock cylinder:
1. Prior to installation, lubricate upper and lower pivot pins with a light
coating of grease.
2. Using suitable lifting equipment, position upper cylinder pivot at frame
pivot. Install upper pivot pin (Item 3) so hole in pin is aligned with hole
in frame boss. Secure upper pivot pin with capscrew (Item 4),
lockwasher (Item 2), and nut (Item 1). Torque nut to 180 in-lbs.