Jlg 1350SJP Service Manual User Manual Page 278

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SECTION 4 - BOOM & PLATFORM
4-44 – JLG Lift – 3121142
4. Install the top wear pad(s) on the fly boom and shim as
necessary to obtain 0 - 1/16” (0 - 1.6 mm) less than the
corresponding dimension recorded in step 2.
5. Slide the fly into the outer mid boom leaving 2 - 6 feet
(0.6-1.8 m) exposed.
6. Install the bottom wear pad(s) and shims if necessary
into the end of the outer mid boom.
7. Temporarily insert the side pads on one side and slide
the fly boom to that side. Insert the other side pads and
using shims, measure how many will be required to fill
the remaining space. Install the total amount of shims
as evenly as possible between the two sides unless cor-
rections are needed to compensate for out-of-square
booms or for corrections due to sweep recorded in step
1. Care should be taken to keep the bottom pads evenly
loaded while shimming the side pads.
NOTE: Do not install more shims than will fit because this may
result in a boom being shimmed too tight. The use of pry
bars or wedges should only be used to finish installing a
shim that can be installed by hand more than ½ of its
length.
8. Install the top wear pads and shims into the end of the
outer mid boom leaving a gap of 0” to 1/16” between
the top of the fly boom and inside of the outer mid
boom.
9. Repeat steps 1-7 to install the fly/outer mid assembly
into the inner mid boom.
10. Repeat steps 1-7 to assemble the fly/out mid/inner mid
assembly into the base boom.
11. Complete the boom assembly. The boom should be
functionally tested and evaluated for boom sweep.
Boom sweep should be limited to no more than 5/16" (8
mm). If necessary, the boom may be re-shimmed by
moving shims from one side to the other to further cor-
rect any remaining boom sweep. There may be some
instances where no shims are used under a given side
pad to pass the criteria for boom sweep at final inspec-
tion of machine.
4.5 JIB ROTATOR ORIENTATION
In order for the Jib Rotator to rotate properly, it must be
installed with the timing marks running parallel to the flat
rotator mounting plate as shown below.
4.6 JIB LIFT END OF STROKE DAMPENING
The jib lift cylinder is constructed in a way that causes the jib
lift cylinder oil flow to be restricted by an orifice while raising
the jib within 5 degrees of maximum elevation. This restriction
slows the jib lift speed while raising the jib. The oil flow is not
restricted while lowering the jib and therefore the speed is not
altered.
4.7 LOAD SENSING PIN REMOVAL AND
INSTALLATION
1. Place the machine on a firm, level surface.
NOTE: Replacing the load sensing pin requires the boom sensors
be re-calibrated. Make sure the machine is in an area
where this can be accomplished after installation of the
new pin.
2. Swing the engine tray out to gain access to the sensing
pin and retaining pin.
NOTE: The lift cylinder weighs 787 lbs. (357 kg.)
Figure 4-15. Jib Rotator Orientation
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