Gradall 534B (9020-7317) Service Manual - Manual (Page 130)

BOOM SLIDER PAD ADJUSTMENT
Slider pads are used between booms to prevent
boom wear. If excessive clearance appears between
the boom sections, pads should be adjusted by
shimming.
HOW TO TEST PADS
FOR EXCESSIVE CLEARANCE
(OVER 1/16") BETWEEN BOOMS
To test the boom clearance, extend the boom fully
and place the head or the attachment on the ground.
Raise and lower the boom slowly and observe the
clearance between the pads and the boom sections.
Also inspect the mating surface of each of the top
and bottom pads. These pads are beveled on the
sides. When they wear down to a point where there
is no more bevel, they should be replaced.
If adjustment is called for, shims should be added to
bring the pads back into close contact with the
adjacent boom. Add shims until no more shims can
be added.
The hoses carrying oil to the front of the boom are
clamped to the bottom plate of the main boom. To
keep them against the two sheave assemblies, hose
tensioning devices are clamped to each hose at the
very front top of the inner boom.
GRADALL
LOED MATERIALS HANDLER
534B
TESTING AND ADJUSTING
TO ADD SHIMS
Each slider pad is attached to the boom using either
two or three bolts. Loosen the bolts and position the
boom to open the gap for that pad area. (On the top
pads and on the bottom pads, this can be done by
applying down pressure or by raising the boom
slightly above ground level). Add shims and tighten
the locking bolts. Note: To maintain proper bolt
engagement in pad, bolt length may have to be
changed to compensate for shim removal or
addition. A bolt too long will damage pad and one
too short may allow bolt to lose torque and fall
out.
HOW TO CHECK AND TIGHTEN
BOOM HOSES
Remove the rear main boom plate and visually
inspect, using a flashlight, to see if the hoses are tight
against the rear sheave. If there appears to be slack
in the hoses, tighten them by turning in on the
adjusting nuts. Loosen the jam nut and tighten as
required. When proper tension is obtained, tighten
the jam nut and replace the rear plate.
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