SkyTrak 8042 Service Manual - Manual (Page 76)

Boom
3-38 6036, 6042, 8042, 10042, 10054
8. At the rear of the boom, attach one end of a wire to
the threaded clevis (9) on the right side extend chain
using 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.
9. Have an assistant pull the chain from the front of the
boom while guiding the wires into the boom from the
rear. Remove the wire from the clevis, but not from
inside the boom.
10. Inspect wear and condition of the booms, chains,
clevis’, chain sheaves, Extend/Retract cylinder,
chain rods, clevis anchors and all mounting
hardware. Replace any worn or damaged parts. DO
NOT attempt to make any repairs to the chain.
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’.
11. Coat the threads of the threaded clevis with multi-
purpose grease.
12. Lay the new extend chain on top of the first boom
section with the threaded clevis toward the front of
the boom.
13. Attach the wire to the threaded clevis of the new
extend chain using 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.
14. Pull the extend chain forward and place over the
right side of the chain sheave (10). Guide the wire
and the threaded clevis under the chain sheave, and
between the top of the third boom section (11) and
the second boom section (12).
15. Have an assistant guide the extend chain into the
front of the boom, while pulling on the wire from the
rear of the boom. Guide the threaded clevis into the
hole in the anchor plate.
16. Assemble the flat washer and locknut to the
threaded clevis. Thread the locknut until the threads
are flush with the top of the nut.
17. Pull the anchor clevis up around the double chain
sheave and position the clevis between the yoke
plates.
18. Coat the capscrew with anti-seize compound. Insert
the capscrew through the yoke plates and clevis and
secure in place with a locknut. Tighten securely; but
the chain must pivot freely.
19. Remove the wire from the clevis.
20. Repeat this procedure for the left side extend chain.
21. At the rear of the boom, tighten the two locknuts on
the extend chain clevis’ until the amount of threads
protruding beyond each locknut is the same as the
measurement recorded during removal of the
chains.
22. Check and adjust boom chain tension. Refer to
Section 3.7.5, “Boom Chain Tension Check.”
23. Install the boom rear cover.
24. Properly connect the battery.
25. Remove the Do Not Operate Tags from both the
ignition key switch and the steering wheel.
MH6510
9
SH1852
10
11
12