JLG 4017RS Service Manual - Manual (Page 52)

Boom
3-12 3614RS, 4017RS
3.4 BOOM CHAIN REMOVAL/INSTALLATION
- 3614RS
3.4.1 Retract Chain Removal
The removal of the retract chain 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 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. Loosen and remove the rear cover and door assembly
from the rear of the first boom section.
6. Properly disconnect the battery.
7. Remove the extend chain lock nut, adjusting nut (1) and
roller assembly (2). Secure extend chain to access the
removal of the retract chain.
8. Remove the retract chain lock nut and adjusting nut (3).
Fasten a rope/wire to the end of the clevis to aid in
reinstallation.
9. Remove the circlip and pin (4) securing the retract chain
clevis (5) at the rear of the third boom section.
10. Pull the retract chain (6) from between the first and
second boom sections from the rear of the boom
assembly.
11. Unfasten the rope/wire from the retract chain clevis.
3.4.2 Retract Chain Installation
1. Fasten the rope/wire left in the boom from the retract
chain removal to the new retract chain clevis and pull
the chain through the boom sections to the
approximate final position. Remove the rope/wire.
2. Install the retract chain, pin and circlip (4) at the rear of
the third boom section.
3. Install the retract chain roller assembly, lock nut and
adjusting nut (3) at the front of the first boom section
below the boom head.
4. Install the rear cover and door assembly to the rear of
the first boom section.
5. Properly connect the battery.
6. Close and secure the engine cover.
7. For chain adjustments see Section 3.7.1, “Chain
Adjustments.”
3.4.3 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.
M 7250 Z
3
1
2
1
M 7120 Z
4
5
6