JLG Lull 1044C-54 II Series Service Manual page 255

Installation, Extension Cylinder
31200079
DANGER: Support of the boom is essential to avoid the possibility of
injury or death should the boom fall. To avoid personal and/or
equipment damage, support the hydraulic cylinder before
removing any additional hardware securing cylinder to the
boom. Use suitable blocking and lifting devices when
removing heavy machine components.
4. Loosen and remove two (2) hydraulic tubes (Item 10) from elbows
(Item 9) on boom extension cylinder (Item 5). Bleed any remaining oil
into a suitable container. Cap fittings and tubes.
5. Loosen two (2) socket setscrews (Item 2) in rod nut (Item 1).
6. Loosen and remove rod nut and rod boss (Item 3) securing boom
extension cylinder to front of middle (rear) boom section (Item 4).
7. Loosen and remove hardware securing extension cylinder to outer
boom section (Item 6) as follows.
Remove two (2) each nuts (Item 14), capscrews (Item 7), and
flatwashers (Item 8) securing extension cylinder base mount (Item 11)
to outer boom section. Also, remove the shim(s) (Items 12 and 13).
8. Slowly remove the cylinder from the machine and take it to a location
suitable for inspection and disassembly.
9. Clean remaining parts with solvent and dry with compressed air.
Inspect for damage and replace as necessary.
The following steps are required to install the boom extension cylinder
(Ref. Fig. 6-117).
1. Using sling(s), crane, or other suitable means, position rod end of
cylinder (Item 5) in its proper location on the middle (rear) boom
section (Item 4).
WARNING: To avoid personal and/or equipment damage, make sure the
cylinder is properly supported until it is completely installed.
2. Secure cylinder to middle (rear) boom section with rod boss (Item 3)
and rod nut (Item 1).
3. Secure cylinder to outer boom section with hardware as follows.
Use two (2) each nuts (Item 14), flatwashers (Item 8), and capscrews
(Item 7). Install as many shims (Items 12 and 13) as necessary before
installing the nuts. Torque nuts to 680 ft-lbs.
4. Torque rod nut to 733 ft-lbs.
5. If socket setscrews (Item 2) were removed, install them in rod nut.
6. Reconnect two (2) hydraulic tubes (Item 10) to elbows on extension
cylinder. Torque tube swivel nuts to 79–88 ft-lbs.
Boom and Transfer
6-113