SkyTrak 8042 Service Manual - Manual (Page 119)

Boom
3.58 Model 8042, 10042, 10054 Legacy Rev. 03/04
3. To increase the separation distance: Loosen the
retract chain locknut (1) on the bottom of the outer
boom one or two turns and tighten the two extend
chain locknuts (2) equally the same number of turns.
A minimum of one full thread on the clevis must
protrude beyond the elastic collar of the locknut.
4. To decrease the separation distance: Loosen the
extend chain locknuts (2) at the rear of boom equally
one or two turns and tighten the retract chain locknut
(1) the same number of turns. A minimum of one full
thread on the clevis must protrude beyond the elastic
collar of the locknut.
5. Assemble the rear cover (3) to the rear of the outer
boom. On the rear of the outer boom (4), position the
rear cover (3) in place. Secure the cover in place
with the saved 5/16" flat washer (5), lockwasher (6),
and thumbscrew (7). 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.
Note: If the inner to intermediate boom separation
distance cannot be achieved, contact the local Sky Trak
distributor or the JLG Service Department at
1-877-554-5438 or 1-717-485-6657.
3.4.5 Boom Extend and Retract Chains
Removal and Replacement
a. Extend Chains Removal and Replacement
1. Park the vehicle on a hard, level surface.
2. Fully retract the boom and raise the boom to a
horizontal position. Place the travel select lever in
(N) NEUTRAL, move the neutral lock lever to
NEUTRAL LOCK position, engage the parking brake
switch and shut the engine OFF.
3. Remove the thumbscrew (7), lockwasher (6) and flat
washer (5) holding the rear cover (3) to the rear of
the outer boom (4). Lift the rear cover straight up
until the capscrew in the top of the cover clears the
retaining hole in the top of the outer boom. Remove
the cover from the outer boom.
OA0512
MH1751
1
2
5
6
7
3
4
MH0850