JLG 660SJ Service Manual - Manual (Page 174)

SECTION 4 - BOOM & PLATFORM
4-2 – JLG Lift – 3121202
4.2 WEAR PADS
Main Boom
1. Shim up wear pads to within 1/32 inch (.79 mm) tol-
erance between wear pad and adjacent surface.
2. Replace wear pads when worn within 1/16 inch (1.59
mm) and 1/8 inch (3.18 mm) - B, C, D of threaded
insert. See Location and Thickness Of Wear Pads.
3. Adjusting wear pads, removing or adding shims,
bolt length must also be changed.
a. When adding shims, longer bolts must be used
to ensure proper thread engagement in insert.
b. When shims are removed, shorter bolts must be
used so bolt does not protrude from insert and
come into contact with boom surface.
4.3 WIRE ROPE
Each day before using the machine:
1. Raise the main boom to approximately horizontal.
2. Extend and retract the boom sections.
3. Check for delayed movement of the fly section,
which indicates loose wire ropes.
Inspection
NOTE: The pictures in this paragraph are just samples to
show the replacement criteria of the rope.
1. Inspect ropes for broken wires, particularly valley
wire breaks and breaks at end terminations.
2. Inspect ropes for corrosion.
3. Inspect ropes for kinks or abuse.
4. Inspect sheaves for condition of bearings/pins. (See
Dimension Of Sheaves for proper dimension.)
5. Inspect sheaves for condition of flanges. (See
Dimension Of Sheaves for proper dimension.)
Figure 4-3. Location and Thickness of Wear Pads
Flexing a wire rope can often expose broken wires
hidden in valleys between strands.
A kink is caused by pulling down a loop
in a slack line during improper handling,
installation, or operation.