JLG 1850SJ Service Manual - Manual (Page 145)

SECTION 4 - BOOM & PLATFORM
3121619 – JLG Lift – 4-59
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 #3 Extend Adjustment Nuts
shown below, moving them a distance equal to
what the section needs to move to be within toler-
ance. (For example, if the section must move 0.5
inches to fall within the dimension shown, tighten
the nut such that it moves 0.5 inches further from
the exposed end of the adjustment stud.)
g. To remove slack resulting from the adjustment in
Step d., tighten the Section #4 Extend Adjustment
Nuts 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.
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 #3 still does not fall within the dimension
and tolerance of Figure 4-36., repeat the steps out-
lined in 3. Boom Section #3 Repositioning.
b. If Section #3 does fall within the dimension and tol-
erance of Figure 4-36., proceed to 4. Boom Section
#4 Repositioning.
BOOM SECTION #4 REPOSITIONING:
1. If Boom Section #4 falls within the dimension and toler-
ance shown in Figure 4-36. with the boom fully
retracted, proceed to Boom Section #5 Repositioning
procedure in this section.
2. If Boom Section #4 does not fall within the dimension
and tolerance shown in Figure 4-36. with the boom fully
retracted, perform the following procedure:
3. If the Section needs to be RETRACTED (measured
dimension is greater 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. Loosen the Section #4 Extend Adjustment Nuts,
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 dimen-
sion shown, loosen the nut such that it moves 1”
closer to the exposed end of the adjustment stud.)
d. Extend the boom assembly such that the platform
moves 4 to 5 feet (1.2m-1.5m) from the fully
retracted position.
e. Tighten the Section #4 Retract 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.)
f. Fully retract the boom.