JLG 1850SJ Service Manual - Manual (Page 147)

SECTION 4 - BOOM & PLATFORM
3121619 – JLG Lift – 4-61
BOOM SECTION #5 REPOSITIONING:
1. If Boom Section #5 falls within the dimension and toler-
ance shown in Figure 4-36. with the boom fully
retracted, proceed to Wire Rope Tensioning procedure
in Section 6 of this document.
2. If Boom Section #5 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 #5 Extend 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.)
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 #5 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.
g. To remove slack resulting from the adjustment in
step c, tighten the Section #5 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 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 so the platform moves 4
to 5 feet (1.2m-1.5m) from the fully retracted posi-
tion.
d. Loosen the Section #5 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.)