TM-9-2320-283-34-2

TRUCK TRACTOR, LINE HAUL, 50,000 GVWR, 6X4, MQ15A1

TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE

DECEMBER 1983

TM-9-2320-283-34-2 - Page 198 of 570

TM 9-2320-283-34-2

BRAKE SYSTEM.

3-80. BRAKE TREADLE VALVE REPAIR (Continued).

LOCATION/ITEM

ACTION

REMARKS

NOTE

The testing procedure for delivery

port No. 2 is similar to delivery port

No. 1.

The delivery pressure of port

No. 2 may be 2 psi less than delivery

port No. 1.

45, Valve (6).

Install on truck.

Refer to TM 9-2320-283-

20.

46. Air system

Close.

Refer to TM 9-2320-283-

draincocks.

10.

47. Delivery port No.

Remove nonmetallic tube.

Refer to TM 9-2320-283-

1 on right-hand

20.

side of valve (6).

48. Air pressure gage. Connect to port No. 1.

Suitable gage, O-200

psi.

49. Engine.

Start up.

Operate until

Maximum pressure is

maximum reservoir pressure

approximately 120 lbs.

is reached.

50. Pedal.

Depress the pedal to several

The delivered air

positions between the fully

pressure on the air

released and full applied

pressure gage should

positions.

vary proportionately

with the movement of the

brake pedal. When the

pedal is fully depress-

ed, the reading on the

air pressure gage should

fall off to zero when

the pedal is released.

If gage does not return

to zero, refer to steps

1 through 42 for repair

of brake valve.

51. Engine.

Shutdown.

Refer to TM 9-2320-283-

10.

3-754