SkyTrak 8042 Service Manual - Manual (Page 192)

3.131 Model 8042, 10042, 10054 Legacy Rev. 03/04
Boom
10. 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 boom,
pull the retract chain out the rear of the boom. Pull
the chain through the middle of the two center hoses
on the chain reel and over the top of the chain reel.
11. The part of the chain that is still inside the boom
must be exposed for inspection. Have another
person assist with this step.
12. At the front of the boom, disconnect the inner boom
extend chain clevis (13) from the anchor plates on
the primary intermediate boom. Remove the elastic
locknut (14) holding the shoulder bolt (15) to the
anchor plates. Pull the extend chain clevis from
between the plates and lay over the front of the inner
boom (16). Save the shoulder bolt and discard the
elastic locknut.
13. Return to the operator’s compartment and start the
engine and slowly retract the boom. To avoid having
the inner boom retract chain becoming entangled,
keep tension on the chain coming out the back of the
boom. Retract the boom as far as possible with the
extend/retract cylinder. Turn the engine OFF.
14. The inner boom will not retract completely and must
be manually pushed in. To avoid having the inner
boom retract chain becoming entangled, keep
tension on the chain coming out the back of the
boom while the inner boom is pushed in.
IMPORTANT: Care should be taken not to push the
inner boom in too far. If the inner boom is pushed in too
far it could damage the hose reel at the back of the
boom.
15. With the chain hanging from the rear of the boom,
inspect wear and condition of the chain, clevis’, chain
sheaves, chain pins, clevis anchors and all mounting
hardware. Replace a worn or damaged chain. DO
NOT attempt to make any repairs to the chain.
Note: 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.
16. Measure the chain elongation. Measure across 17
pins (17), somewhere between the chain sheave and
where the chain is laying in the pan or on the tarp.
The maximum measurement allowed is 12.36"
(313 mm). If the measurement is more than 12.36"
(313 mm), the chain must be replaced. (Refer to
Section 3.7.6, “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’.
17. If the chain needs to be replaced, refer to Section
3.7.6, “Boom Extend and Retract Chains Removal
and Replacement.”
MH1790
13
14
15
16
MH5700
17