JLG G6-42A Service Manual - Manual (Page 55)

3-17 G6-42A, G9-43A, G10-43A
Boom
Note: Disconnecting one or both extend/retract
hydraulic tubes (9) may be required to gain access to the
hose guide mounting bolts. After removing both hose
guides, re-connect one or both extend/retract hydraulic
tubes BEFORE proceeding.
10. Loosen and remove the tilt cylinder hose guide (10)
and if equipped, the auxiliary hose guide from the
rear of the third second section.
Note: The hose guide mounting bolts also hold the push
pin beams in place.
11. Remove the left and right push beam pins (11).
12. Start the machine and SLOWLY extend the extend/
retract cylinder 1 - 2 ft (305 - 609 mm) or until the
push beam assembly can be accessed through the
front of the third boom section.
Note: Only the push beam - extend/retract cylinder
assembly should move during this procedure.
13. Shut machine OFF.
14. Properly disconnect the battery.
15. Loosen and remove the four bolts (12), guide bar
(13) and chain retainer (14) from the front of the
push beam.
16. Disconnect the extend chain (15) from the anchor
rod (16) and lay flat on the bottom of the third boom
section. Remove the anchor rod (16) from the front
of the boom.
Note: It may be necessary to lift the extend /retract
cylinder through the access holes in the sides of the third
boom section to remove the chain retainer (14).
17. At the rear of the boom, remove both retaining clips
(17) from the extend/retract cylinder pin (18).
Remove the extend/retract cylinder pin from the
strong back (19).
18. Loosen and remove the eight bolts (20) from the
strong back (19). Remove the strong back.
19. Remove both extend/retract cylinder hydraulic tubes.
Plug the tube ends and cap the fittings to prevent dirt
and debris from entering the hydraulic system.
NOTICE
The extend chain rod will move toward the front of
boom. Do Not allow the rod to come into contact with
the chain and/or chain roller.
MAL1290
10 10
11 11
9
9 MY3930
13
15
16
14
12
MAL1290
17
19
18
17
20
20
20