JLG 4017RS Service Manual - Manual (Page 72)

Boom
3-32 3614RS, 4017RS
1. Loosen the locknuts on the extend and retract chains.
2. Adjust extend chains (1) and retract chain (2) to ensure
a gap of (B) between the back of the second boom
section and the back of the third boom section.
3. Adjust extend chain (3) and retract chain (4) to ensure a
gap of (A) between the back of the third boom section
and the back of the fourth boom section.
4. Tighten the extend and retract chain lock nuts to 120
Nm (86 lb-ft) against the adjusting nut.
Note: Ensure that there is a minimum of one full thread of the
clevis showing beyond the lock nut.
5. Start the machine and slowly extend and retract the
boom three times.
6. Retract the extend/retract cylinder completely. Turn
OFF engine.
7. Verify boom section dimensions. Repeat steps 1 thru 3 if
necessary.
8. Start the machine, lower the out riggers if necessary and
extend the boom to maximum extension, then retract
51 to 76 mm (2 to 3 in). Shut machine off.
9. Measure the distance (5) between the top of extend
chain and the top of the third boom section.
10. Measure the distance (6) between the top of both
extend chains and the bottom of the second boom
section.
11. The distance between the extend chains and the each
boom section should measure 140-145 mm (5.5-5.7 in).
12. Loosen the locknuts on the extend chains and adjust if
necessary. Tighten locknuts to 120 Nm (86 lb-ft).
13. Start the machine and cycle the extend/retract cylinder
to verify the boom extends and retracts properly.
MZ7870
3
1
4
2
MZ7990
5
6