MAINTENANCE OF FORKLIFTS - OD1660 - LESSON 1/TASK 1
CAUTION
Check the lining frequently for wear.
To check
for wear, apply the brakes and look into the
spring openings in the brake frames.
If the
brakeshoe tends to shear the spring at a point
between the frame and the shoe (approximately 1/8
inch space between the top of the opening and the
edge of the shoe upon which the spring rests),
travel is at a maximum. Replace the linings and
the springs before this condition is reached.
Continued operation in this condition will damage
the brake structure.
(1) Cleaning; Inspection and Repair.
(a) The brake assembly should be cleaned using a cloth dampened
in acetone or lacquer thinner.
The components should not be
saturated.
(b) The expander tube should be inspected for signs of
excessive heat shown by brittleness, or loose fabric or rubber around
the nozzle base that might permit fluid leakage.
(c) The expander tube shields should be checked for looseness
and replaced if they are loose.
(d) The brake block and shoe assemblies should be checked for
separation of lining from the shoe.
NOTE
The friction on the braking surface of the lining
may develop ridges and grooves.
The leading
edge, that which is in the direction of rotation,
tends to wear slightly unevenly. Either of these
conditions is normal.
(e) The frame assemblies should be inspected for wear or
distortion of the torque bars, cracks at the welds of the torque
bars, and cracks or elongation of frame bolt holes.
The frames
should not have more than 1/16 inch elongation of the bolt holes.
(f) The retracting springs should be checked to see if any are
broken or distorted, comparing questionable springs with new ones.
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