SkyTrak 8042 Service Manual - Manual (Page 196)

3.135 Model 8042, 10042, 10054 Legacy Rev. 03/04
Boom
2. Tighten or loosen the two extend chain adjustment
locknuts (6) 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 (5) on the outer boom. The front of the
yoke should be parallel with the front edge of the
outer boom.
3. If there is no adjustment left on the extend chains,
tighten the retract chain locknut (7) at the front on
the underside of the outer boom.
4. Recheck chain tension. (Refer to Section 3.7.3,
“Boom Chain Tension Check.”)
Note: ALWAYS replace elastic locknuts with new elastic
locknuts to help ensure proper fastening.
5. Further chain adjustment can be achieved by
loosening all three chain locknuts (6 and 7) and
moving the rear intermediate retract chain clevis (8)
from the original mounting hole (9) in the anchor
plate to the next hole (10).
This is only acceptable when boom chain sag (3)
cannot be acquired and the chain elongation
measurement is still less than 12.36" (313 mm).
Make sure to use a new 3/8-16 elastic locknut (11) to
re-secure the chain clevis to the anchor plate. Follow
the instructions in Section 3.7.4, a. “Component/
Assembly Verification.”
6. Recheck chain tension. (Refer to Section 3.7.3,
“Boom Chain Tension Check.”)
OH0551
4
5
MH1780
6
OA0512
7
MA9450
8
9
10
11