Lull 944E-42 Service Manual - Manual (Page 81)

3.33 Model 644E-42/944E-42 Rev. 6/04
Boom
7. Remove the elastic locknut (10) and flat washer (11)
holding the retract chain threaded clevis (12) to the
mounting tab. Save the flat washer and discard the
elastic locknut.
8. Attach a string or wire (13) to the threaded eye (14),
that was installed in Step 6. The string or wire must
be long enough to pull the clevis (12) and chain
through the outer boom (15).
9. Place a pan or tarp, free of dirt, at the rear of the
vehicle, for the chain to rest on as it is being
removed from the boom. From the rear of the outer
boom (17), pull the retract chain out of the rear of the
boom.
10. With the chain hanging from the rear of the
boom (17), inspect the condition of the chain, clevis,
chain sheaves, chain pins, clevis anchors and all
mounting hardware. Replace a worn or damaged
chain.
11. DO NOT attempt to repair a chain. Replace a
stretched or damaged chain with a new part. Always
replace both the chain and the clevis. It is
recommended that when any chain is replaced, that
all chains and clevis be replaced at the same time.
12. Measure the chain elongation. Measure across 17
pins (16), somewhere between the chain sheave and
where the chain is laying in the pan or on the tarp.
The maximum measurement allowed is 12-3/8"
(313 mm). If the measurement is more than 12-3/8"
(313 mm), the chain must be replaced. (Refer to
Section 3.4.5, “Boom Extend and Retract Chains
Removal and Replacement.”)
Note: Chains and clevis’ are wear items and experience
the same stress. DO NOT attempt to repair a chain.
Replace a stretched or damaged chain with a new part.
Always replace both the chain and the clevis’.
13. If the chain needs to be replaced, refer to Section
3.4.5, “Boom Extend and Retract Chains Removal
and Replacement.”
14. Lubricate the chain, while it is exposed, if it does not
need to be replaced. (Refer to Section 3.4.2, “Chain
Lubrication.”)
MU1410
10
12
11
MU3930
13
14
15
MU3960
16
17