SkyTrak 8042 Service Manual - Manual (Page 207)

Boom
3.146 Model 8042, 10042, 10054 Legacy Rev. 03/04
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 (1) holding the secondary
intermediate boom retract chain to the secondary
intermediate boom, just in front of the retract chain
sheave (2). Remove the elastic locknut (3) and
shoulder bolt (4) holding the secondary intermediate
boom retract chain clevis to the anchor plates.
Discard the elastic locknut and save the shoulder
bolt. The two anchor plates can remain in place on
the secondary intermediate boom.
9. From the rear of the boom, pull the secondary
intermediate boom retract chain out of the rear of the
boom.
10. Disconnect the string, wire or rod from the retract
chain clevis, and allow it to hang out the rear of the
boom.
11. Coat the threads of the threaded clevis (6) with multi-
purpose grease.
Note: Have a second person help with the installation of
the new secondary intermediate boom retract chain in
between primary intermediate and outer boom assemblies.
12. At the rear of the boom, attach the string, wire or rod
to the retract chain threaded clevis end (6).
13. From the rear of the boom, a person should push the
threaded clevis end (6) of the new retract chain (7)
under the chain sheave and down between the
intermediate boom and the outer boom, while
another person pulls the retract chain through the
boom using the previously attached string or wire
(9). If the string or wire was attached to the clevis,
the person at the front of the boom can guide the
clevis through tab (8) using a Phillips screwdriver
(12). Insert the screwdriver though the tab and catch
the countersunk hole (13) in the end of the clevis.
Guide the threaded clevis out as the person at the
rear of the boom pushes the retract chain. Keep the
retract chain (7) to the right side of the boom, push
and pull the threaded clevis down to the tab (8) at
the front underside of the outer boom.
14. Reassemble the flat washer (10), saved, and a new
elastic locknut (11) 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 (5)
up and over the chain sheave (2). Place the clevis
between the two anchor plates (1). Line up the hole
in the clevis with the anchor plate hole position
recorded during removal.
Note: ALWAYS replace elastic locknuts with new elastic
locknuts to help ensure proper fastening.
16. Insert the shoulder bolt (4), saved, through the
plates and clevis and secure in place with a new
elastic locknut (3). Tighten the locknut securely.
MH2550
1
2
3
4
5
MH4630
6
7
8
9
MH2560
10
11
12
13