Oshkosh Corporation JLG 450AJ, Service And Maintenance Manual

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SECTION 4 - BOOM & PLATFORM
3121659 – JLG Lift – 4-9
4.3 BOOM SHIMMING PROCEDURE
NOTE: When installing wear pads, the wear pad bolt lengths may
need to be adjusted as shim thicknesses are adjusted. Bolt
lengths should be flush or up to one thread below the sur-
face of the insert.
1. Measure and take note of the inside width and inside
height of the base boom opening for reference later in
this procedure.
2. Install the side wear pads on the fly boom and shim as
required to match the corresponding dimension
recorded in Step 1 0/-1.2 mm. Shims should be
divided as evenly as possible between the sides of the
boom. The number of shims installed at position #1
must match with position #2, and position #3 must
match position #4 as shown below. Take note to how
many shims are installed in each position.
3. Install the top wear pads and shims on the fly boom.
4. Install the bottom wear pads on the fly boom and shim
as required to obtain the total base boom dimension
0/-1.2 mm of the corresponding dimension
from Step 1.
5. Slide the fly boom into the base boom, leaving 1 to 2
meters exposed.
6. Install the bottom wear pads and shims into the end of
the base boom.
7. Install the side pads and shims into the base boom. Dis-
tribute shims to each side to match the distribution
noted in Step 2. Positions #5/6 must match positions #1/
2. Positions #7/8 must match positions #3/4 (See Figure
4-6. and Figure 4-7.). Verify that no more shims will fit on
either side.
NOTE: Do not use a wedge to install more shims than will fit with
the use of a pry bar. This may result in the boom being
shimmed too tight. The use of pry bars should only be used
to finish installing a shim that can be installed by hand
more than half of its length.
8. Install the top wear pads and shims into the base boom
leaving a gap of 0mm to 1.2mm between the top of the
fly boom and the inside of the base boom.
Figure 4-6. Fly Boom Wear Pads
Figure 4-7. Base Boom Wear Pads