Wear Pads - JLG 660SJ Service And Maintenance Manual

SECTION 4 - BOOM & PLATFORM
h. With powertrack support and using all applicable
safety precautions, remove bolts #3 and #4 securing
rail to the base boom section. Remove powertrack
from boom section.
Figure 4-3. Boom Powertrack Components
4. Remove boom assembly from machine as follows:
a. Using suitable lifting equipment, adequately sup-
port boom assembly weight along entire length.
CAP HYDRAULIC LINES AND PORTS IMMEDIATELY AFTER DISCONNECTING
LINES TO PREVENT ENTRY OF CONTAMINANTS INTO SYSTEM.
b. Tag and disconnect hydraulic lines from telescope
cylinder. Use a suitable container for residual
hydraulic fluid. Cap hydraulic lines and ports.
c. Remove hardware securing lift cylinder rod end to
base boom section.
d. Using a suitable brass drift and hammer, remove lift
cylinder pin from base boom.
e. Remove hardware securing master cylinder rod end
to base boom section.
f. Using a suitable brass drift and hammer, remove the
master cylinder pin from the base boom.
g. Remove hardware securing push bar to turntable
upright.
WHEN REMOVING PIN FROM PUSHBAR DO NOT DROP PUSHBAR ON WIRE
ROPE ADJUSTMENT THREADS. FAILURE TO DO SO WILL DAMAGE THREADS.
h. Using a suitable brass drift and hammer, remove
push bar pin from turntable upright.
i. Remove hardware securing boom pivot pin to turn-
table upright.
j. Using a suitable brass drift and hammer, remove
pivot pin from turntable upright.
k. Using all applicable safety precautions, carefully lift
boom assembly clear of turntable and lower to
ground or suitably supported work surface.
4-2

4.2 WEAR PADS

Wear pads are made of polyethylene. Pads move on polyureth-
ene painted surfaces. No paint is removed and no lubrication
is applied.
PAD
A
B, C, D
Figure 4-4. Location and Thickness of Wear Pads
1. Shim wear pads to within 1/32 inch (.79 mm) tolerance
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. Bolt length must be changed when adjusting wear pads
and removing or adding shims.
a. Longer bolts must be used when adding shims to
ensure proper thread engagement in insert.
b. Shorter bolts must be used when shims are
removed so bolt does not protrude from insert and
contact boom surface.
– JLG Lift –
THICKNESS REPLACE WHEN
OF NEW PAD WORN TO:
5/8" 9/16"
3/4" 5/8"
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