JLG 4017PS Service Manual - Manual (Page 56)

Boom
3-18 3706PS, 3707PS, 4014PS, 4017PS, 33.7, 37.6, 37.7
7. Remove the retract chain lock nut and adjusting nut
(2) from the bottom front of the first boom section.
8. Remove the retract chain roller (3) to allow for retract
chain removal.
9. Pull the retract chain (4) from between the second
and third boom sections below the boom head.
10. Unfasten the rope/wire from the retract chain.
3.7.2 Retract Chain Installation
1. Fasten the rope/wire left in the boom from the retract
chain removal to the new retract chain and pull the
chain through the boom sections to the approximate
final position. Remove the rope/wire.
2. Install the retract chain lock nut and adjusting nut (1)
at the rear of the third boom section.
3. Install the retract chain roller (3) if previously
removed.
4. Install the retract chain lock nut and adjusting nut (2)
at the front of the second boom section below the
boom head.
5. Properly connect the battery.
6. Close and secure the engine cover.
7. For chain adjustments see Section 3.10.1, “Chain
Adjustments.”
3.7.3 Extend Chain Removal
The removal of the extend chains can be accomplished
with out the complete tear down of the boom sections.
1. Remove any attachment from the quick coupler
assembly. Refer to Operation & Safety Manual.
2. Park the machine on a hard, level surface, fully
retract the boom, level the boom assembly, place the
transmission control lever in (N) NEUTRAL, engage
the park brake and shut the engine OFF.
3. Place a Do Not Operate Tag on both the ignition key
switch and the steering wheel.
4. Open the engine cover. Allow the system fluids to
cool.
5. Properly disconnect the battery.
6. Remove the extend chain lock nuts and adjusting
nuts (5) from the extend chain at the top of the first
boom section. Fasten a rope/wire to the threaded
end of the shackle end to aid in reinstallation.
7. Remove the hose guard bracket (6) from the rear of
the second boom section.
8. Remove the connecting pin (7) from the extend
chain.
9. Pull the extend chain from between the first and
second boom sections at the rear of the machine.
10. Unfasten the rope/wire from the extend chain.
11. Repeat steps 6 through 10 to remove the other
extend chain.
MAM1380
2
3
4
MAM0720
5
5
6
MAM1370
7