MAINTENANCE OF FORKLIFTS - OD1660 - LESSON 1/TASK 1
(g) The inlet connection block bore, where the o-rings seal
should be, are inspected for scratches and grooves.
(h) The brake drums should be checked for cracks, distortion,
and scored surfaces.
Scored brakedrums can be repaired by turning
them on a lathe.
No brake lining is any better than the drum it
contacts.
The maximum amount a brakedrum should be turned is 0.060
to 0.080 inch.
(i) If any linings have come loose from the shoes, they should
be re-riveted.
(j) The frame assembly should be replaced if it is cracked or
broken. Expander tubes should be recemented if they are loose. All
shields should be removed to recement, reversing the block and shoe
assemblies from their original installation.
A good neoprene base
adhesive compound should be used to cement the shields.
(k) The expander tube should be replaced if cracked, charred,
or if the nozzle is loose.
(l) The brake linings should be replaced if worn beyond the
minimum thickness; if the torque bar forms ridges on the end face of
the linings that may cause the block and shoe assemblies to hang up,
or if excessive cracking or chipping is evident.
(m) The frame assemblies should
be
replaced
if
they
are
distorted from any crack or damage.
(n) The retracting springs are to be replaced if they are
broken or distorted and when new linings are installed.
All twelve
springs are to be replaced to ensure uniform retraction.
(2) Straight Hydraulic Brake System Bleeding Procedure. To bleed
the straight hydraulic brake system, these procedures should be
followed:
(a) Fill the reservoir with hydraulic oil (OE-10).
NOTE
The reservoir should be free of dirt.
A screen
should be provided in the reservoir to keep out
foreign particles.
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