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 147 of 894
BRAKES-AIR
TRUCK SERVICE MANUAL
SERVICE CHECKS
Operating Test
Operation of the low pressure indicator may be
checked with ignition switch on, then by reducing the
reservoir pressure and being sure that the contacts close
when the reservoir pressure is between 76 pounds
maximum and 64 pounds minimum.
The contacts will be
closed when the warning light or electrical buzzer
operates.
Leakage Test
A small vent hole is provided in the cover of the
low pressure indicator to check the condition of the
diaphragm. Cover the vent hole with soap suds or use
Leak Detector (SE2326); if a leak is indicated, it signifies
a ruptured diaphragm.
Replace complete assembly.
REMOVE
1
.
The ignition switch should be in the "off" position.
2
.
Drain the air from the system.
3
.
Disconnect the electrical connections at the Low
Pressure Indicator.
4
.
Remove the Indicator from fitting.
REINSTALL
1
.
Install indicator in fitting where old indicator was
removed.
2
.
Connect electrical connections.
3
.
Charge air system and perform Leakage Test.
NOTE:
Disassembly and reassembly of Low Pressure
Indicator is not recommended since it is only serviced as
a complete assembly.
STOP LIGHT SWITCH
DESCRIPTION
The
stop
light
switch
(Fig.
6)
is
an
electropneumatic switch which operates in conjunction
with the brake valve and stop lights by completing the
electrical circuit when a brake application of 5 psi or
more is made.
Both the primary and secondary brake systems are
equipped with a stop light switch on a straight truck.
If a
failure should occur in either the primary or secondary
systems, the system which is functioning properly will
provide stop lights when the brakes are applied.
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