Lull 6K Service Manual - Manual (Page 392)

Boom and Transfer
6-142 Service Manual — Models 644B, 6K, 844C, 8K, 1044C, 10K
WARNING: To avoid personal and/or equipment damage, support the
hydraulic cylinder before removing support bracket and other
hardware that secure the cylinder to the boom. Use suitable
blocking and lifting devices when removing heavy machine
components.
6. Place blocks between the extension cylinder and the support bracket
(Item 8) to prevent damage to the cylinder during removal.
7. Retract the extension cylinder.
8. Loosen and remove two (2) hydraulic tubes (Item 10) from the fittings
on the boom extension cylinder (Item 9). Bleed any remaining oil into a
suitable container. Cap fittings and tubes.
9. Using sling(s), crane, or other suitable means to secure the cylinder,
loosen and remove two (2) each capscrews (Item 12) and lockwashers
(Item 11) securing the extension cylinder to the rear of the outer boom
section (Item 5).
10. Remove two (2) capscrews (Item 6), lockwashers (Item 7), and the
cylinder support bracket (Item 8).
11. Slowly remove the cylinder from the machine and take it to a location
suitable for inspection and disassembly.
12. For models with outriggers, remove the cylinder stop assembly as
follows:
a. For early production models (see View A),
1). Remove the nut (Item 16), lockwasher (Item 15), and capscrew
(Item 13) securing the cylinder stop (Item 14) to the extension
cylinder.
2). Remove the two (2) each nuts (Item 19), lockwashers
(Item 18), and capscrews (Item 17) securing the two (2)
cylinder stop halves; remove the cylinder stop halves.
b. For all other models (see View B),
1). Remove the nut (Item 21), lockwasher (Item 22), and capscrew
(Item 20) securing the cylinder stop tube (Item 23) to the
extension cylinder.
2). Remove the cylinder stop tube.
13. Clean the remaining parts with solvent and dry with compressed air.
Inspect for damage and replace as necessary.
Installation, Boom Extension Cylinder
(Ref. Fig. 6-151) The following steps are required to install the boom
extension cylinder.
1. For models with outriggers, install a cylinder stop assembly as follows:
a. For early production models (see View A),