SkyTrak 8042 Service Manual - Manual (Page 205)

Boom
3.144 Model 8042, 10042, 10054 Legacy Rev. 03/04
18. After the chain is replaced inside the boom,
assemble the sheave to the mount at the front of the
secondary intermediate boom.
Note: ALWAYS replace elastic locknuts with new elastic
locknuts to help ensure proper fastening.
19. Place the saved inner boom extend chain sheave (1)
between the mounts at the front of the secondary
intermediate boom. Insert the sheave pin (2), saved,
through the mounts and the sheave. Use a tapered
punch to line up the mounting hole in the pin with the
mounting hole in the hub. Secure in place with the
capscrew (3), saved, and a new elastic locknut (4).
Tighten securely.
20. After the sheave is assembled, apply a good grade
of multi-purpose grease to the grease fitting (5) at
the end of the pin (2). Turn the sheave by hand to
distribute the grease evenly.
21. Pull the inner boom extend chain (6) up and around
the sheave (7) at the front of the secondary
intermediate boom.
Note: ALWAYS replace elastic locknuts with new elastic
locknuts to help ensure proper fastening.
22. Place the extend chain clevis (8) between the
mounting plates at the front of the secondary
intermediate boom. Coat the saved shoulder bolt (9)
with anti-seize compound and insert through the
plates and clevis. Secure the shoulder bolt in place
with a new elastic locknut (10). Tighten securely, but
the chain clevis should pivot freely.
23. At the rear of the boom, tighten the elastic
locknut (11) on the inner boom extend chain clevis
until the amount of threads protruding beyond the
elastic locknut is the same as the measurement
recorded during removal of the extend chain.
24. Check and adjust the inner boom extend chain
tension. (Refer to Section 3.7.3, “Boom Chain
Tension Check.”)
MH2510
1
2
3
4
5
MH2520
6
7
8
9
10
MH5710
11
11