Gradall 534B (9103-1390) Service Manual - Manual (Page 90)

BOOM SLIDER PAD ADJUSTMENT
Slider pads are used between boom sections. If
excessive clearance appears between the boom sec-
tions, 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 main boom
are adjusted at the bottom front of the main boom. To
keep them against the sheave assemblies, tensioning
devices are clamped to each hose.
PROCEDURE FOR INSTALLING
BOOM BEARING RETAINING BOLTS
Shim bearing to proper fit.
When installing bearing retaining bolt, make sure
end of bolt is not sticking out of bearing insert to the
point where it would be in the bearing wear area. To
achieve this, you may have to use washers under the
heads of the bolts as shims. If this causes the bolt
heads to hit other boom bearings exchange these
bolts for ones of correct length.
3/8" bearing retainer bolts should be installed with
blue loctite and then torqued to 30-35 ft./lbs.
1/2" bearing retainer bolts should be installed with
blue loctite and then torqued to 68-78 ft./lbs.
When rechecking bolts at correct torque after loctite
has set they should not turn.lf they do turn more than
360 they must be removed and blue loctite reapplied.
NOTE: When removing bearing pad bolts to
reapply loctite only remove one bolt at a time.
Reinstall the bolt and tighten before removing
another bolt. This prevents the shims or bearing pad
from falling out of place.
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HOW TO CHECK AND TIGHTEN
BOOM HOSES
Remove the rear main boom plate 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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