TM 5-3805-258-24-1
A I R S Y S T E M A N D B R A K E S
3. Push and hold either brake pedal in a down
position.
4. Put soapy water on all connections and valves in
the air circuit. Check for leakage.
NOTE: If air pressure in the reservior gets below
cutin pressure (see chart), start and run the engine
until the air pressure goes up to the cutout pressure.
5.
6.
7.
8.
Release the brake pedal.
Put soapy water on the exhaust diaphragm of
each brake control valve. Check for leakage.
Correct any leakage that is found.
Remove the gauge.
NOTE: During the time the valve are checked for
leakage, check the exhaust passages for restriction,
like mud or dirt. A restriction in an exhaust passage
will prevent or slow the release of pressure air
during normal operation.
AIR COMPRESSOR GOVERNOR
T o o l s N e e d e d : 0 t o 1 3 8 0 k P a ( 0 t o 2 0 0 p s i ) G a u g e .
WARNING
Make reference to WARNING on first page of
AIR SYSTEM AND BRAKES TESTING AND AD-
3.
4.
5.
6.
7.
8.
JUSTING section.
9.
1.
2.
L O C A T I O N T O I N S T A L L G A U GE
1. Drain valve of the air reservoir.
Install a 0 to 1380 kPa (0 to 200 psi) gauge on
drain valve (1) of the air reservoir.
Start the engine and let the pressure go up to the
cutout pressure.
T E S T I N G A N D A D J U S T I NG
A I R C O M P R E S S O R G O V E R N OR
1. Adjustment screw. 2. Locknut.
Read the cutout pressure on the gauge.
Push one of the brake pedals rapidly several
times, until air compressor cuts-in (starts).
Read the cut-in pressure on the gauge.
See chart for correct governor pressures. If the
pressures are not correct, adjust the governor.
Use this procedure to adjust the governor:
a. Loosen locknut (2) adjustment screw (1).
b. Turn the adjustment screw counterclockwise
to make the cutout pressure lower (clockwise
to raise). One turn of the screw changes the
pressure 140 kPa (20 psi). The cut-in pressure
will change the same amount.
If the adjustment screw does not change the
cutout cutout pressure, the unloading valves in
the air compressor are not working correctly.
If the cut-in to cutout pressure difference is not
correct, the governor is not working correctly.
10. Remove the gauge.
[
GOVERNOR AIR PRESSURES
I
950BNS 8nd 950Bs
Cut-h Pressure
655 ~ 14 kPa
(95 * 2 psi)
Cutout Pressure
758 k 14 kPa
(110 * 2 psi)
950BNSCE -d 950Bsm
Cut-In Pressure
700+0 -35kPa
(loo+ o-5pei)
Cutout Pressure
825 &35 kPa
(120 *5 Deii
4-60
