TM-5-3805-254-14-P-2
TRUCK, DUMP, 20 TON, 6X4, ON-OFF HIGHWAY 71,000 GVW, IHC MODEL F-5070 (CCE)
TECHNICAL MANUAL; OPERATOR’S, ORGANIZATIONAL, DIRECT SUPPORT, GENERAL SUPPORT AND DEPT MAINTENANCE MANUAL (INCLUDING REPAIR PARTS INFORMATION AND SUPPLEMENTAL MAINTENANCE INSTRUCTIONS)
JUNE 1980
TM-5-3805-254-14-P-2 - Page 235 of 894
BRAKES-PARKING
MOTOR TRUCK SERVICE MANUAL
operating pressure limits, will result in the spring brakes
automatically applying the service brakes.
CAUTION:
DO NOT attempt to perform any
disassembly whatsoever of the parking brake with the
unit on the vehicle, even though the air pressure is
exhausted and the parking brake spring is some what
decompressed as shown in Fig.
6.
The parking brake
spring is by no means completely decompressed.
It is
still exerting a force of approximately 1200 lb.
against
the head of the chamber.
Disassembly of the parking brake should be
performed with the unit on an arbor press or hydraulic
press where adequate safety measures can be taken
(see "DISASSEMBLY").
Fig.
7
Parking Brake Applied through Loss of Air
Pressure and Service Brake Released with Release Bolt.
Fig.
7 illustrates release mechanism of the spring brake.
Note position of release bolt and push rod.
REMOVAL From the information outlined under
"OPERATION", it can be readily seen that to avoid
possible serious bodily injury and damage to the brake
assembly, no attempt should be made to disassemble
the parking brake with unit installed on the vehicle.
The
parking brake should be removed from the vehicle as a
complete assembly and moved to a suitable press where
adequate safety measures can be taken during
disassembly.
The following information will assist
in the removal of the parking brake and service brake
assembly:
1. Adequately block vehicle wheels to prevent
vehicle from rolling.
2. Release air pressure to parking brake and
service brake.
3. Remove air hoses from parking brake and
service brake chambers.
Tag hoses for proper
reassembly.
4. Disconnect service brake piston rod from slack
adjuster.
5. Remove parking and service brake assembly
from mounting bracket.
DISASSEMBLY
The following disassembly procedure is based on the
parking and service brake assembly being removed from
the chassis:
1. Remove the breather cap from end of parking
brake cylinder.
This will expose the release bolt.
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