55
55
Standard
Standard thickness
thickness
7.2
7.2
8
8
Max.
Max. thickness
thickness
5.0
5.0
6
6
(5) Check the inner surface of
(5) Check the inner surface of brake drum for damage and excessively worn. If
brake drum for damage and excessively worn. If
necessary
necessary, repair
, repair or replace i
or replace it.
t.
Unit: mm
Unit: mm
2,2.5t
3t,3.5t
2,2.5t
3t,3.5t
Standard
Standard dimension
dimension
310
310
314
314
Max.
Max. dimension
dimension
312
312
316
316
(6) Measure the free length and
(6) Measure the free length and the load of the
the load of the brake shoe return spring.
brake shoe return spring.
(7) Check the adjuster for damage, check the
(7) Check the adjuster for damage, check the operation, and the contact point
operation, and the contact point
between the lever and gear for
between the lever and gear for defect. Replace it if necessary
defect. Replace it if necessary..
4.6 Troubleshoot
4.6 Troubleshoot
Problem
Problem
Probable
Probable cause
cause
Remedy
Remedy
Poor
Poor
braking
braking
1.Fluid
1.Fluid leaks
leaks from
from brake
brake system
system
Repair
Repair
2.Maladjustment
2.Maladjustment of
of brake
brake shoe
shoe clearance
clearance
Adjust
Adjust the
the adjuster
adjuster
3.Brake
3.Brake overheating
overheating
Check
Check for
for dragging
dragging
4.Poor contact between brake drum and friction
4.Poor contact between brake drum and friction
Readjust
Readjust
5.Foreign
5.Foreign matter
matter adhered
adhered on
on friction
friction piece
piece
Repair
Repair or
or replace
replace
6.Foreign
6.Foreign matter
matter mixed
mixed in
in brake
brake fluid
fluid
Check
Check brake
brake fluid
fluid
7.Maladjustment
7.Maladjustment of
of brake
brake pedal
pedal (inching
(inching valve)
valve)
Adjust
Adjust
Noisy
Noisy
1.Hardened friction piece surface or foreign matter
1.Hardened friction piece surface or foreign matter
adhered on it
adhered on it
Repair or replace
Repair or replace
2.Deformed
2.Deformed backing
backing plate
plate or
or loose
loose bolts
bolts
Repair
Repair or
or replace
replace
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