AIR SYSTEM AND BRAKES
TM 5-3805-263-14&P-3
PEDAL ADJUSTMENT FOR
SERVICE BRAKES
With pedal released, roller must be just in contact (slight
drag) with plunger. If necessary, remove material from
stop (6) on pedal under floor plates.
1. Remove all air pressure from air tanks and air
lines, 0 psi (0 kPa).
2. Turn brake valve plunger adjustment screw (4)
out until a slight drag is felt when roller (5) is
turned.
3. Turn pedal stop screw (1) all the way down.
4. Pull pedal (7) down until a solid stop in the valve
is felt. This is the maximum stroke of the valve.
NOTE: If the pedal hits the platform before maximum
stroke of the valve can be felt, turn the valve plunger
adjustment screw (4) out one turn.
5. With pedal (7) pulled down, turn stop screw (1)
up until it just touches the pedal. Release the
pedal.
6. Tighten jam nuts (2) and (3). Do not turn stop
screw (1) and adjustment screw (4) after jam nuts
are tightened
7. Check to be sure valve is exhausting. There
should be 0 psi (0 kPa) at tandem when the pedal
is up.
QUICK RELEASE VALVE
FOR BRAKE CONTROL
(5D470)
Pressure for operation ...........................15Q psi (1030 kPa)
Valve normally closed
Supply and delivery differential ........................ 1 psi (7 kPa)
CONTROL VALVE FOR PARKING BRAKE
(5D4382)
Maximum operating pressure ................ 150 psi (1030 kPa)
(1) 5D7780 Spring:
Length under test force .............................. 55 in. {14.0 mm)
Test force .2.5 to 3.5 lb. (11 to 16 N)
Free length after test.................................. 64 in. (16.3 mm)
Outside diameter ....................................... 48 in. (12.2 mm)
4J3957 Spring:
Free length................................................. 67 in. (17.0 mm)
Inside diameter ........................................... 42 in (10 7 mm)
3-151
