Skyjack SJ519 TH, Service Manual

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SJ519 TH 216942AC
Section 4 – Procedures Non-Routine Maintenance
Remove Wear Pads
1. Fully retract the boom.
2. Remove the rear cover.
3. Remove screw, wear pad, shims, and spacer from
the boom. For ease of installation, keep all parts
that were removed together as an assembly.
For the rear sides:
4. Before removing the screws from the wear pads,
use a pry bar under the shims of the side wear
pads. The bar prevents the shims from falling
when the screws are removed.
5. Remove the screws, shims, and wear pads
while holding the bar under the shim. For easier
installation, keep all parts removed together as an
assembly.
For the top boom:
6. The weight of the boom must be removed from
the rear wear pads to allow removal. Use the
boom control lever to lower the boom until the
carriage is on the floor or surface. This action
changes the load forces on the boom sections
so that there is clearance between the wear pads
and the outer boom.
7. Remove the screws, shims, and wear pads.
For easier installation, keep all parts removed
together as an assembly.
Install Wear Pads
NOTE
To keep the boom section centered, make sure
that the number of shims on the top wear pads
are approximately equal to the number on the
bottom wear pads. The number of shims on each
side of the boom must also be approximately
equal.
NOTE
Shims are 0.015, 0.030, and 0.060 inch thick.
Add or subtract shims as required to obtain a
clearance on the side between the middle and
outer boom secions of 0.59” maximum. When the
correct clearance is achieved, remove the screws
and apply red thread locking compound to the
threads of both the screws and wear pads.
1. Clean installation area to remove any residual
grease. Ensure threads are free of grease, dirt.
2. With the carriage lowered to the floor, install the
top wear pads.
3. Apply blue loctite and tighten the screws to 37
ft-lb.
4. Start the engine and raise the carriage from the
floor.
5. Install the bottom wear pad assemblies.
6. Apply blue loctite red and tighten the screws to 37
ft-lb.