TM 5-3810-307-10
Table 5-1. Operator Preventive Maintenance Checks and Services - Continued
ITEM
ITEM TO BE
NOT FULLY
NO.
INTERVAL
CHECKED OR
PROCEDURE
MISSION
SERVICED
CAPABLE IF
Any switch defective
Perform operating and
66
WEEKLY
Air System Low
or leaking.
leakage checks.
Pressure
Indicating
a. With the engine shut
Switches
down and the ignition
switch ON, slowly
reduce pressure in the
system.
b. Low pressure switch
should actuate at
approximately 75 psi
(517 kPa) as indicated
by sounding of the
buzzer and
illumination of the
LOW AIR indicator.
c. With air pressure
present at the port,
coat the indicator
switch with a soap
solution. No leakage
is permitted.
Plunger boot
67
WEEKLY
Dual Brake
a. Clean dirt and foreign
damaged and/or
Valve
material away from
missing/loose
heel of treadle,
hardware.
plunger boot, and
mounting plate.
b. Check plunger boot
for cracks, holes, and
c. Check mounting plate
treadle for security.
5-53
