SkyTrak 8042 Service Manual - Manual (Page 121)

Boom
3.60 Model 8042, 10042, 10054 Legacy Rev. 03/04
11. Lay the new extend chain (1) on top of the outer
boom (2) with the threaded clevis (3) toward the front
of the boom.
12. Attach the wire (4) to the threaded clevis (3) of the
new extend chain. Loop the wire through the clevis
and twist together to form a loop.
13. Pull the extend chain forward and place over the
right side of the chain sheave (5). Guide the wire and
the threaded clevis into the boom by placing the
threaded clevis under the chain sheave, and
between the top of the inner boom (6) and the
intermediate boom (7).
14. While one person guides the extend chain into the
front of the boom, a second person should pull the
wire (8) and threaded clevis toward the rear of the
boom. Guide the threaded clevis (9) into the hole in
the anchor plate (10).
15. Place the 3/4" flat washer (11), saved, onto the
threaded end of the threaded clevis and assemble a
new 3/4-16 elastic locknut (12). Thread the elastic
locknut onto the threaded clevis until the threads are
flush with the top of the nut.
16. Pull the anchor clevis (13) up around the double
chain sheave and position the clevis between the
yoke plates (14).
17. Coat the hex-socket head capscrew (15), saved, with
anti-seize compound. Insert the capscrew through the
yoke plates and clevis and secure in place with a
new 3/8-16 elastic locknut (16). Tighten securely; but
the chain clevis must pivot freely.
18. Cut the loop in the wire and remove the wire from the
clevis.
19. Repeat Section 3.4.5, a. “Extend Chains Removal
and Replacement,” starting with Step 5, to remove
and replace the left side extend chain.
20. At the rear of the boom, tighten the two elastic
locknuts (12) on the extend chain clevis’ until the
amount of threads protruding beyond each elastic
locknut is the same as the measurement recorded
during removal of the extend chains.
21. Adjust extend chain tension. (Refer to Section 3.4.4,
“Boom Chain Tension Adjustment.”)
22. After adjustment is complete, assemble the rear cover
to the rear of the outer boom. At the rear of the outer
boom (17), position the rear cover (18) in place.
Secure the cover in place with the saved 5/16" flat
washer (19), lockwasher (20), and thumbscrew (21).
Insert the thumbscrew through the bottom of the
outer boom and into the rear cover. Tighten the
thumbscrew securely to hold the cover in place.
SH1851
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