High Pitch Noise Repair
A high pitch squealing noise can be cause by the following:
1: Tight cylinder seal. Noise happens in both raising and lowering.
Use Caterpillar additive 1U-9891. Start with 2 ounces, engage up switch to bypass,
Hold for 30 seconds then cycle liftgate 4-5 times or until noise stops. Add about
two ounces more at a time, until noise stops. A maximum of eight ounces only. If after 8 ounces
the
noise does not stop or diminish contact factory.
2: Defective Flow valve. Noise would happen mostly in the lowering cycle. (See procedure for
flow valve replacement)
3: Hose guard and column switch guard interference. Noise would happen in both raise and
lowering at certain stage on the cycle only. Inspect locations and grind edges as required to
stop interference. See picture below.
4: Platform hinge pins interference. Noise would happen in both raise and lowering at about 10
to14
inched from bed level only. Inspect location and grind as required to stop interference. See
picture below.
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