SkyTrak 8042 Service Manual - Manual (Page 82)

Boom
3-44 6036, 6042, 8042, 10042, 10054
5. At the front underside of the boom, locate the retract
chain locknut (7). Record the amount of threads
extending beyond the locknut. This measurement
will be the starting point for adjustment of the retract
chain after installation.
6. At the front underside of the fourth boom section,
remove the locknut and flat washer holding the
retract chain threaded clevis to the mounting tab.
7. Attach a wire or string to the threaded clevis with a
threaded eye or a flat washer tack welded to a
capscrew. The outside diameter of the eye or flat
washer must be smaller than the diameter of the
threads on the clevis. The wire or string will be used
to pull the chain back through the boom during
reassembly.
Note: Record the location of the shoulder bolt to ensure
correct installation.
8. At the rear of the boom, locate the two retract chain
anchor plates. Remove the locknut and shoulder bolt
(8) holding the retract chain clevis to the anchor
plates. The two anchor plates can remain in place on
the third boom section.
9. From the rear of the boom, pull the boom retract
chain out of the rear of the boom.
10. Disconnect the string or wire from the retract chain
clevis, and allow it to hang out the rear of the boom.
11. Coat the threads of the threaded clevis with multi-
purpose grease.
12. At the rear of the boom, attach the string or wire to
the new retract chain threaded clevis end with a
threaded eye or a flat washer tack welded to a
capscrew. The outside diameter of the eye or flat
washer must be smaller than the diameter of the
threads on the clevis.
13. From the rear of the boom, have an assistant push
the threaded clevis end of the new retract chain
under the chain sheave and down between the
second and first boom sections, while pulling the
retract chain through the boom using the previously
attached string or wire. Keep the retract chain to the
right side of the boom, push and pull the threaded
clevis down to the tab at the front underside of the
boom.
14. Reassemble the flat washer and a locknut (9) onto
the threaded clevis. Tighten the locknut until the
threaded end of the clevis is flush with the top of the
locknut.
15. At the rear of the boom, place the retract chain up
and over the chain sheave. Place the clevis between
the two anchor plates. Line up the hole in the clevis
with the anchor plate hole position recorded during
removal.
16. Insert the shoulder bolt through the plates and clevis
and secure in place with a locknut. Tighten the
locknut securely.
17. Check and adjust the retract chain tension. Refer to
Section 3.7.5, “Boom Chain Tension Check.”
OA0513
7
MH2551
8
MH2561
9