JLG G6-42A Service Manual - Manual (Page 62)

Boom
3-24 G6-42A, G9-43A, G10-43A
7. With dimension “A” less than 17.000 in (421,8 mm),
verify the extend rod Belleville washers and retract
chain Belleville washers are loose. Tighten the
extend chain rod adjusting nut (2) until dimension “A”
is 17.438-17.562 in (443,0-446,1 mm).
8. Install and temporarily tighten the extend chain
lock nut (1).
9. Tighten the retract chain adjustment nut (6) until
the belleville washers (7) become fully compress to
distance of “B” 1.500-1.512 in (38,1- 38,4 mm).
Do Not Overtighten.
10. Install and temporarily tighten the retract chain
lock nut (4).
11. Start the machine and at low idle, fully extend and
retract the boom three times. Verify boom is fully
retracted and level. Shut machine Off.
12. Recheck the Belleville washers (7) to verify they are
fully compressed to dimension “B” 1.500-1.512 in
(38,1- 38,4 mm). If required, re-tighten the retract
chain adjustment nut (6) until dimension “B” is
obtained.
Note: If dimension “B” requires adjustment, continue to
step 13. If dimension “B” does NOT require adjustment,
continue to step 14.
13. Start the machine and at low idle, fully extend and
retract the boom three times. Verify boom is fully
retracted and level. Shut machine Off.
14. Verify dimension “A” 17.000-17.312 in
(421,8-439,7 mm). Verify dimension “C” is not
less than 3.069 in (77,9 mm).
Note: Re-adjust boom if dimensions “A” & “C” are not
met. Contact the local JLG Distributor if the procedure
cannot be obtained.
15. Loosen the retract chain lock nut and the extend
chain lock nut and apply Loctite ® 242 TM .
16. Torque the retract chain lock nut (5) and extend
chain lock nut (1) without adding any additional
spring load. Torque each lock nut to 100 lb-ft
(135 Nm).
C
MAL2580
3
1
2
B MAL2591
4
5
6 7