JLG 1850SJ Service Manual - Manual (Page 146)

SECTION 4 - BOOM & PLATFORM
4-60 – JLG Lift – 3121619
g. To remove slack resulting from the adjustment in c,
tighten the Section #4 Extend Adjustment Nuts
shown below until they contact the rope mount
plate.
h. Extend the boom assembly so the platform moves 4
to 5 feet, then fully retract.
i. Repeat step h three times to equalize rope position.
j. Go to step 5.
4. If the Section needs to be EXTENDED (measured dimen-
sion is less than dimension shown in Figure 4-36.):
a. Remove any covers necessary to access the wire
rope adjustment nuts.
b. Remove lock plates and nylon collar locknuts from
wire rope adjustment studs.
c. Extend the boom assembly such that the platform
moves 4 to 5 feet (1.2m-1.5m) from the fully
retracted position.
d. Loosen the Section #4 Retract Adjustment Nuts
shown below, moving them a distance equal to
twice what the section needs to move to be within
tolerance. (E.g. If the section must move ½” to fall
within the dimension shown, loosen the nut such
that it moves 1” closer to the exposed end of the
adjustment stud.)
e. Retract the boom assembly such that the platform
moves 2 to 3 feet (0.6m-0.9m) from the previous
extended position in step c.
f. Tighten the Section #4 Extend Adjustment Nuts
shown below, moving them a distance equal to
what the section needs to move to be within toler-
ance. (E.g. If the section must move ½” to fall within
the dimension shown, tighten the nut such that it
moves ½” farther from the exposed end of the
adjustment stud.)
g. To remove slack resulting from the adjustment in
step d, tighten the Section #4 Retract Adjustment
Nuts shown below until they contact the rope
mount plate.
h. Extend the boom assembly such that the platform
moves 4 to 5 feet, then fully retract.
i. Repeat step h three times to equalize rope position.
j. Go to step 5.
5. Fully retract the boom sections.
6. Verify that the exposed boom section dimensions meet
the dimension and tolerance of Figure 4-36.
a. If Section #4 still does not fall within the dimension
and tolerance of Figure 4-36., repeat the steps out-
lined in 4. Boom Section #4 Repositioning.
b. If Section #4 does fall within the dimension and tol-
erance of Figure 4-36., proceed to 5. Boom Section
#5 Repositioning.