SkyTrak 8042 Service Manual - Manual (Page 139)

Boom
3.78 Model 8042, 10042, 10054 Legacy Rev. 03/04
9. From the front of the boom, pull both extend chains
out from between the secondary intermediate boom
and the primary intermediate boom.
10. At the rear of the secondary intermediate boom (1),
remove the capscrew (2) and lockwasher (3) holding
the retract chain sheave pin (4) to the mounting plate
on the left side of the secondary intermediate boom.
11. Remove the retract chain sheave pin (4) from the
mount and the retract chain sheave (5). Remove the
retract chain sheave from the secondary
intermediate boom.
12. Inspect the bushings inside the sheave (5). Replace
the bushings if there are any signs of wear.
13. Inspect the pin (4) for wear or damage. Replace the
pin if there are any signs of wear.
Note: Record the location of the shoulder bolt (6) to
ensure correct installation.
14. At the rear of the boom, locate the secondary
intermediate boom retract chain (7) on the right side
of the boom. In front of the retract chain sheave (8),
locate the shoulder bolt (6) which holds the two
anchor plates (9) to the mount on the secondary
intermediate boom. Remove the elastic locknut (10)
from the shoulder bolt and remove the shoulder bolt.
Save the shoulder bolt and discard the elastic
locknut. Let the retract chain hang out the rear of the
boom.
15. Pull the secondary intermediate boom straight out of
the primary intermediate boom. Reposition the
slings as needed so the secondary intermediate
boom balances when removed from the primary
intermediate boom. Set the secondary intermediate
boom down on blocks on a hard, level surface.
16. Inspect the boom and welds. Consult the local Sky
Trak distributor or the JLG Service Department at
1-877-554-5438 or 1-717-485-6657, if structural
damage is detected.
17. Inspect hoses, hardware, wear pads, mounting
points, chains and other components visible with the
intermediate boom removed. Replace if damaged.
18. Inspect all wear pads for wear. (Refer to Section
3.9.1, “Wear Pad Inspection.”)
MH2020
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WARNING:
NEVER weld or drill the
boom. The structural integrity of the boom will
be impaired if subjected to any repair involving
welding or drilling. Failure to comply can result
in death or severe personal injury.
MH4080
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