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TRUCK SERVICE MANUAL
TM 5-4210-230-14&P-1
BRAKES-PARKING
Fig. 2 Parking Brake Adjustment in the Orscheln Hand Lever
ADJUSTMENT
Adjustment
of
brake
will
be
required
when
replacement of lining, shoes or drum is required.
Refer to Figure 2 pertaining to the nomenclature in
the following adjustment procedure.
1.
Block wheels to prevent vehicle from moving.
2.
Position parking brake hand lever in released
position (forward).
3.
Assemble control rod with yoke to brake lever bell
crank if disconnected.
4.
Move brake operating lever in apply direction to a
position where contact is made with the brake cam
but without any shoe movement. This will remove
excess clearance in mechanism (approximately 6.35
to 9.53 mm, 1/4" to 3/8", free play at lever).
5.
Adjust clevis until hole in clevis aligns with mating
hole in bell crank.
6.
Assemble clevis to bell crank and tighten clevis
locknut.
7.
If vehicle is equipped with Orscheln parking brake
lever (over-center type), turn adjusting knob on end
of hand lever until a force of 41 kg (90 lbs) is attained
to apply the parking brake.
The Orscheln (parking) brake lever is the over-center
locking type. It is tightened (while released) by turning the
adjusting knob clockwise. When properly adjusted, it pulls
over center with a distinct click.
PARKING BRAKE BURNISHING (W/Orscheln Lever)
The following burnishing procedure is required to be
performed on new vehicles or whenever the parking brake
lining and/or drum is replaced.
Vehicles with Orscheln Lever
1
The vehicle must be loaded near rated GVW.
2.
Release parking brake, turn adjusting knob until a
force is obtained to apply the brake (over-center
position of the lever) which will result in the vehicle
making a somewhat lighter than normal stop (3-5 ft
per second) without wheel lockup.
3.
Make ten (10) stops from 16 km/h (10 mph) on a dry
hard surface road using only parking brake to stop
vehicle.
4.
After each stop, release parking brake and drive
vehicle at 32 km/h (20 mph) for 4 km (2.5 miles) to
cool the brake.
5.
Readjust parking brake linkage (between hand lever
and brake assembly) and hand lever adjusting knob
to suit operational requirement considering load and
road grades for vehicle operation.
CTS-2210Q Page 4
PRINTED IN UNITED STATES OF AMERICA
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