SkyTrak 8042 Service Manual - Manual (Page 79)

3-41 6036, 6042, 8042, 10042, 10054
Boom
8. Inspect the capscrews for signs of wear or damage.
Replace with new capscrews if damaged or worn.
9. At the front of the second boom section, remove the
capscrew and lockwasher holding the extend chain
sheave pin to the sheave mount bracket. Remove
the pin from the mount bracket and the extend chain
sheave. Remove the extend chain sheave from the
mount.
10. At the rear of the boom, attach one end of a wire to
the threaded clevis (18) on the right side extend
chain 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.
11. Have an assistant pull the chain from the front of the
boom while guiding the wire into the boom from the
rear. Remove the wire from the clevis, but not from
inside the boom.
12. Coat the threads of the threaded clevis with multi-
purpose grease.
13. Lay the new extend chain on top of the first boom
section with the threaded clevis toward the front of
the boom.
14. 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.
15. Pull the extend chain forward and place in between
the chain sheave mounts. Guide the wire (19) and
the threaded clevis into the boom by placing the
threaded clevis between the top of the third boom
section and the second boom section.
16. Have an assistant guide extend chain into the front
of the boom while pulling the wire and threaded
clevis toward the rear of the boom. Guide the
threaded clevis into the hole in the anchor plate.
17. Place the flat washer onto the threaded end of the
threaded clevis and assemble the locknut. Thread
locknut onto the threaded clevis until the threads are
flush with the top of the nut.
18. Remove the wire from the clevis.
19. Repeat this procedure for the left side extend chain.
20. After both of the chains are replaced inside the
boom, assemble the double sheave to the mount at
the front of the second boom section.
21. Place the double extend chain sheave between the
mounts and under the extend chains at the front of
the second boom section. Insert the sheave pin
through the mounts and the double sheave. Line up
the mounting hole in the sheave pin with the
threaded hole in the sheave mount and secure in
place with the capscrew and the lockwasher. Tighten
securely.
22. Pull the anchor clevis’ up around the double chain
sheave and position the clevis’ one at a time
between the yoke plates.
23. Coat the capscrews with anti-seize compound. Insert
the capscrews through the yoke plates and clevis’
and secure in place with locknuts. Tighten each
locknut securely, but the chain clevis’ must pivot
freely.
MH6510
18
MH2601
19