Section XII. CARRIER LOW AIR PRESSURE WARNING SWITCH
378. General
The carrier low pressure indicator is a safety service
designed to give an automatic warning to the operator
when the air pressure in the air brake system is below
the minimum advisable for normal vehicle operation. It
operates an electrical buzzer or warning light. When the
reservoir air pressure drops below 60 pounds, the
diaphragm spring exerts a force above the diaphragm
which is greater than the force exerted by the air
pressure below the diaphragm, causing the diaphragm
to move down and close the electrical contacts. This
completes or closes the electrical circuit to the electrical
buzzer or warning light.
379. Carrier Low Air Pressure Warning Switch
Removal and Disassembly
a. Removal. Remove the carrier low air pressure
warning switch (TM 5-3810-207-20).
b. Disassembly. Disassemble the carrier low air
pressure warning switch in numerical sequence as
illustrated on figure 106.
380. Carrier Low Air Pressure Warning Switch
Cleaning, Inspection, and Repair
a. Cleaning. Clean all parts with an approved
cleaning solvent and dry thoroughly.
b. Inspection and Repair. Inspect all parts for
excessive wear and damage. Replace or repair all
defective parts.
381. Carrier Low Air Pressure Warning Switch
Assembly and Installation
a. Reassembly. Reassemble the carrier low air
pressure warning switch in the reverse of the numerical
sequence as illustrated on figure 106.
b. Installation. Install the carrier low air pressure
warning switch (TM 5-3810-207-20).
1
Locknut
5
Release pin
2
Adjusting nut
6
Steel ball
3
Spring
7
Spring cage
4
Spring seat
8
Body
Figure 104. Carrier safety valve assembly, exploded
view.
TAGO 5030A
173
