JLG G6-42A Service Manual - Manual (Page 58)

Boom
3-20 G6-42A, G9-43A, G10-43A
16. Install the belleville washers (13) to the extend chain
anchor (14) as previously removed at the rear of the
first boom section.
17. Install adjustment and lock nut, (15) to extend chain
anchor (14) at the rear of first boom section.
18. Remove the rope or wire from the retract chain (16).
19. Install the belleville washers (17) to the retract chain
clevis (16) as previously removed at the bottom front
of the first boom section.
20. Install adjustment and lock nut (18) to retract chain
clevis (16) at bottom front of first boom section.
Note: Note position of belleville washer for reassembly.
21. Install both hose retainer brackets (19).
22. Remove the plugs and caps from the tilt hoses and
auxiliary hoses.
23. Connect both tilt hoses (20) and both auxiliary hoses
(not shown) to the hose retainer brackets (19) at the
bottom front inside the boom.
24. Properly connect the battery.
25. Adjust the chain as needed. Refer to Section 3.8,
“Boom Adjustments.”
26. Install the cover on the rear of the boom.
27. Close and secure the engine cover.
28. Remove the Do Not Operate Tags from both the
ignition key switch and the steering wheel.
3.8 BOOM ADJUSTMENTS
3.8.1 Chain Tension Inspection—G6-42A
1. Park machine on level ground. Place transmission
control lever in (N) NEUTRAL, engage parking brake
and level boom.
2. Place a Do Not Operate Tag on both ignition key
switch and steering wheel.
3. Extend the boom 4-5 ft (1,2-1,5 m), then fully retract
the boom. Verify boom is level.
4. Measure the following three dimensions; A, B & C.
5. At the boom head, verify dimension “A” is between
11.500-11.812 in (292,1-300,0 mm).
MAL2670
17 18
16
G6-42A
G9-43A
G10-43A
MAL1310
20
19
A
MAL2561