JLG 1850SJ Service Manual - Manual (Page 144)

SECTION 4 - BOOM & PLATFORM
4-58 – JLG Lift – 3121619
BOOM SECTION #3 REPOSITIONING:
1. If Boom Section #3 falls within the dimension and toler-
ance shown in Figure 4-36. with the boom fully
retracted, proceed to Boom Section #4 Repositioning
procedure in this section.
2. If Boom Section #3 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 #3 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 #3 Retract Adjustment Nuts,
moving them a distance equal to what the section
needs to move to be within tolerance (for example,
if the section must move 0.5 inches to fall within the
dimension shown, tighten the nut so it moves 0.5
inches further from the exposed end of the adjust-
ment stud).
f. Fully retract the boom.
g. To remove slack resulting from the adjustment in
step e., tighten the Section #4 Extend adjustment.
h. 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.
i. Extend the boom assembly so the platform moves 4
to 5 feet, then fully retract.
j. Repeat step i three times to equalize rope position.
k. 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 #3 Retract 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.)