JLG G6-42A Service Manual - Manual (Page 59)

3-21 G6-42A, G9-43A, G10-43A
Boom
3.8.2 Chain Tension Adjustment—G6-42A
1. Remove the extend chain lock nut (1) and loosen
adjustment nut (2) until the belleville washers (3) are
free to turn on the extend rod.
2. Verify the belleville washers (3) are in the correct
order as shown. Remove the extend chain
adjustment nut (2) and correct if required.
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 11.625 in
(295,2 mm), push the third section boom IN until
dimension “A” is less than 11.625 in (295,2 mm).
7. With dimension “A” less than 11.625 in
(295,2 mm), verify the extend rod Belleville washers
(3) and the retract chain Belleville washers are
loose. Tighten the extend chain rod adjusting nut (2)
until dimension “A” is 12.063-12.188 in
(306,4-309,5 mm).
8. Install and temporarily tighten the extend chain
lock nut (1).
C MAL2571
3
1
2
B
MAL2551
4
5
6 7
A
MAL2561
C MAL2571
3
1
2