JLG sky trak mmv Service Manual page 171

7. If the intermediate boom to inner boom measurement
is greater than 9" (229 mm): Tighten the retract
chain locknut (4) located on the bottom front of the
outer boom (5).
8. Start the vehicle and cycle the boom in and out
several times. Then with the boom horizontal, retract
the boom completely. Turn the vehicle OFF.
5
Model MMV Rev. 12/04
3
OT0760
4
OT04902
9. Recheck the measurement at the rear of the boom
between the intermediate and inner boom. If the
measurement is still more than 9" (229 mm), repeat
Steps 4-6.
Note: If, by adjusting the retract chain locknut (4), you
cannot obtain the measurement within the range of
8.5-9" (216-229 mm), the boom may require extensive
adjustment and/or repair. Contact the JLG Service
Department or the nearest JLG Authorized Service
Center (ASC).
10. Start the vehicle, cycle the boom in and out several
times. With the boom horizontal, fully extend the
boom and then retract it 2" (51 mm) (one inch per
section). Turn the vehicle OFF.
IMPORTANT: With the boom fully extended, apply
"LPS3", "LUBRIPLATE" chain and cable fluid or equiva-
lent to the two extend chains.
11. Measure the sag (1) in the top extend chains
between the bottom of the chains and the top of the
intermediate boom (2) at their closest point.
Acceptable boom chain sag is between 1.5-2.5"
(38-64 mm).
If the measurement is less than 1.5" (38 mm), the
top boom extend chains may need to be adjusted.
Refer to Section 4.3.6, b. Extend Chain Adjustment .
Boom
4.27