SkyTrak 8042 Service Manual - Manual (Page 116)

3.55 Model 8042, 10042, 10054 Legacy Rev. 03/04
Boom
3.4.4 Boom Chain Tension Adjustment
Note: Always perform Section 3.4.3, “Boom Chain Ten-
sion Check” before adjusting the boom chain tension.
1. Remove the thumbscrew (4), lockwasher (5) and flat
washer (6), holding the rear cover (7) to the rear of
the outer boom (8). 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.
2. Adjust the two boom extend chains (9).
If the chain sag measurement (3) is less than
1.5" (38 mm), tighten the two extend chain
adjustment locknuts (11).
If the chain sag measurement (3) is more than
2.5" (64 mm), loosen the two extend chain
adjustment locknuts (11).
3. Tighten or loosen the two extend chain adjustment
locknuts (11) located at the rear of the boom. Be
sure each of the locknuts are adjusted equally so
that each extend chain maintains the same tension.
Equal chain tension can be checked by the position
of the yoke (10) on the outer boom. The front of the
yoke should be parallel with the front edge of the
outer boom.
4. If there is no adjustment left on the extend chains,
tighten the retract chain locknut (12) at the front on
the underside of the outer boom.
MH0850
7
8
4
5
6
OH0240
9
10
MH1751
11
OA0512
12