JLG 1850SJ Service Manual - Manual (Page 148)

SECTION 4 - BOOM & PLATFORM
4-62 – JLG Lift – 3121619
e. Retract the boom assembly such that the platform
moves 2 to 3 feet (0.6m-0.9m) from the previous
extended position in Boom Section #3 Positioning,
Step 4c.
f. To remove slack resulting from the adjustment in
Step 3d, tighten the Section #4 Extend Adjustment
Nuts shown below until they contact the rope
mount plate.
g. 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 #5 still does not fall within the dimension
and tolerance of Figure 4-36., repeat the steps out-
lined in Boom Section #5 Repositioning.
b. If Section #5 does fall within the dimension and tol-
erance of Figure 4-36., proceed to Wire Rope Ten-
sioning Procedure.
Wire Rope Tensioning Procedure
NOTE: NOTE: Repeat Wire Rope Tensioning Procedure only as nec-
essary to achieve proper tension.
Verification of the rope tension should be determined by
proper deployment function of the boom assembly and by
the dimensions and tolerances shown in Figure 4-36..
If the boom sections have been properly positioned but
there is not enough adjustment travel remaining on a wire
rope to achieve proper torque, the service life of the rope
has been consumed. Do not continue with the remainder
of this procedure. Replace all wire ropes and sheaves.
1. Remove any covers necessary to access the wire rope
adjustment nuts.
2. Remove lock plates and nylon collar nuts from wire rope
adjustment studs.
3. Position the boom so that it is horizontal within +/- 5º,
and not supported by the boom rest.
4. Extend the boom assembly such that the platform
moves 4 to 5 feet (1.2m-1.5m) from the fully retracted
position. The purpose of this step is to position the
boom sections such that the ropes to be tensioned are
not under load. If the extending boom reaches end of
stroke and then automatically retracts a small amount,
the ropes may still be under load. In such case, the fol-
lowing additional steps are necessary:
a. Note where the boom reached end of stroke.
b. Retract 3 to 4 feet (1m-1.3m).
c. Extend the boom, stopping just before end of stroke
is reached.
5. Using tool, JLG p/n 1001162217, torque Section #3
Retract Adjustment Nuts to 38 ft-lb (51.5 Nm), alternat-