Lull 944E-42 Service Manual - Manual (Page 80)

Boom
3.32 Model 644E-42/944E-42 Rev. 6/04
c. Expose Retract Chain for Inspection
The retract chain must be removed from the boom in
order to be visually inspected. This must be done every
1000 hours or whenever the retract chain is removed from
the boom. (If removal of the chain is required refer to
Section 3.4.5, “Boom Extend and Retract Chains
Removal and Replacement.”)
While doing the chain inspection, check all chain clevis
ends for distortion or cracking and sheaves for bearing
wear or grooving from the chain.
If during the inspection, any chain is found to be damaged
or stretched, the chain must be replaced. It is
recommended that when any chain is replaced, that all
the chains and clevis’ be replaced at the same time.
1. Park the vehicle on a hard, level surface.
2. Fully retract the boom and raise the boom to a
horizontal position. Place the travel select lever in
the (N) NEUTRAL DETENT position, engage the
parking brake switch and shut the engine OFF.
3. Remove four capscrews (1) and flat washers (2).
Remove the boom rear cover (3). Leave the clips (4)
attached to the cover.
4. At the front underside of the boom, record the amount of
threads extending beyond the elastic locknut (5). This
measurement will be the starting point for adjustment
of the boom retract chain.
5. Loosen the elastic locknut (6) far enough so that it
can be removed by hand.
6. The chain clevis has a threaded hole on the end (7),
a string or wire can be attached to the retract chain
clevis using a threaded eye (8) or a flat washer tack
welded to a capscrew (9). The outside diameter of
the eye or flat washer must be smaller than the
diameter of the threads on the clevis. The string or
wire will be used to pull the chain back through the
boom during the reassembly.
MU0170
1
2
3
1
2
2
1
2
4
MU1410
5
6
MU3900
7
8
9