Table of Contents
Advertisement
BRAKES
Read all of SAFETY and this section before attempting any procedure. Pay particular attention to Notices, Cautions, Warnings and Dangers.
Condition
B
Grabbing brakes (oversensitive)
parking brake hard to latch
parking brake will not stay latched
FAULT DIAGNOSIS AND INSPECTION
New Vehicle
A new vehicle will experience an initial break-in of compo-
nents including the brake cables and brake shoes. In this
break-in period, it is common for the brake pedal free
travel (and the effort required to latch the parking brake)
to change. The timing of this change varies with terrain
and the driving habits of the operator(s). When this
occurs, the brake linkage must be adjusted. See Adjusting
Brake Pedal Free Travel. After the initial break-in period, no
further adjustments are necessary until routine mainte-
nance is scheduled.
Fault Diagnosis and Inspection Procedures
To find the problem in the mechanical brake system,
inspect the brake pedal and linkage to find worn or dam-
aged parts per the Fault Diagnosis Table. Then, do the
Periodic Brake Performance Test to evaluate the brake
system performance. Based on the results of the inspec-
tion and tests, refer to the Fault Diagnosis Table
(Figure 6) to evaluate symptoms and repairs. If neces-
sary, disassemble the wheel brake to find and correct
internal faults.
For removal or replacement of parts and adjustments
referred to in this section of the manual are described in
detail under See the MAINTENANCE AND REPAIRS.
Satisfactory brake performance
does not eliminate the need for rou-
tine brake testing and inspection as
indicated in the SCHEDULED MAINTENANCE sec-
46
Possible Cause
Moisture has caused surface rust on
drums
Brake Pivot binding
Inadequate free play
Sticky/dragging cable
Dragging shoes
Excessive wear
Figure 6 Fault Testing Table (Continued)
Repair and Service Manual
Correction
Apply moderate force to pedal while at
maximum level ground speed to remove
rust until condition is relieved.
Check and replace poor components
Adjust pedal free travel at spherical nut
and check that wheel brake actuators
are returning fully
Check for brake lever return
Check that brake levers return at equal
rate - (Indication of dragging cable)
Check wheel brakes
Check for worn latch mechanism
tion. Correct brake operation depends on mainte-
nance.
Brake Pedal and Linkage Inspection
1.
Inspect brake pedal return bumper.
Ensure that the pedal is contacting the return
bumper when released, that the bumper is in good
condition and that a 1/4" - 3/8" (6 - 9.5 mm) gap
exists between the pedal arm and the setscrew
heads of the kick-off cam (Figure 7). Replace or
adjust the bumper if required. See the Pedal Bumper
Adjustment..
1/4" - 3/8" (6 - 9.5 mm) diameter
drill or bolt must pass
through tap.
Figure 7 Brake Pedal Bumper Inspection
2.
Check brake pedal return.
Apply the brake pedal and release. Check that the
brake pedal arm rests against the return bumper
when released. Check that the torsion spring is
hooked around both the pedal and the frame and is
in good condition. If the pedal does not return fully or
is sluggish, the brake pedal bushings and pivot bolt
should be inspected (Figure 8). Replace pedal,
spring, bushings and bolt as required. See the Brake
Pedal Removal and Installation..
Adjust at bumper if needed.
653045
Advertisement
Table of Contents
