JLG G6-42A Service Manual - Manual (Page 54)

Boom
3-16 G6-42A, G9-43A, G10-43A
3.7 PUSH BEAM - EXTEND/RETRACT
CYLINDER REMOVAL/
INSTALLATION
The following section explains the removal of the push
beam - extend/retract cylinder without removing or
disassembling the boom assembly.
3.7.1 Push Beam - Extend/Retract Cylinder
Removal
1. Park the machine on a hard, level surface, level the
machine, fully retract the boom, level the boom,
place the transmission control lever in
(N) NEUTRAL, engage the park brake and shut the
engine OFF.
2. Place a Do Not Operate Tag on both the ignition key
switch and the steering wheel.
3. Open the engine cover. Allow the system fluids to
cool.
4. Remove the cover from the rear of the first boom
section.
5. Disconnect both tilt hoses (1) and both auxiliary
hoses (not shown) from the hose retainer brackets
(2) at the bottom front inside the boom. Plug the
hose ends to prevent dirt and debris from entering
the hydraulic system.
6. Remove both hose retainer brackets (2).
7. Loosen and remove the lock nut, adjustment nut (3)
and belleville washers (4) from the retract chain (5)
at the bottom front of the first boom section.
Note: Note the position of the belleville washers for
reassembly.
8. Secure a rope or wire to the retract chain (5).
9. Loosen and remove the lock nut, adjustment nut (6)
and belleville washers (7) from the extend chain
anchor (8) at the rear of the first boom section.
Note: Note the position of the belleville washer for
reassembly.
CAUTION
The complete push beam - extend/retract cylinder
assembly weighs over 1,200 lb (545 kg).
MAL1310
1
2
MAL2670
4 3
5
G6-42A
G9-43A
G10-43A
MAL2660
7
6
8
G6-42A
G9-43A
G10-43A