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

Boom
3-24 G6-42A, G9-43A, G10-43A
3. Remove lock nut (4) from retract chain clevis (5).
4. Set the retract chain adjustment nut face (6) flush
with the end of the retract clevis.
5. Verify the belleville washers (7) are in the correct
order as shown. Remove the retract chain
adjustment nut (6) and correct if required.
Note: Belleville washers are shown in the
un-compressed state.
6. If dimension “A” is greater than 17.000 in
(421,8 mm), push the third section boom IN until
dimension “A” is less than 17.000 in (421,8 mm).
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.
B MAL2591
4
5
6 7
A
MAL2740
C
MAL2580
3
1
2
B MAL2591
4
5
6 7