TM-9-2320-273-34

TRUCK TRACTOR, LINE HAUL; LIGHT EQUIPMENT TRANSPORTER; TRUCK CHASSIS; MEDIUM EQUIPMENT TRANSPORTER

TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE

DECEMBER 1980

TM-9-2320-273-34 - Page 548 of 801

TM 9-2320-273-34

b. Unloader Valve.

(1)

Apply 100 psi (690 kPa) shop air pressure to unloader port and operating the engine at

rated speed, the compressor should unload (not pump air).

(2)

Reduce the air pressure to the unloader valve to zero. The air compressor should operate

(pump air). The operation of the unloader valve must be free from chatter and must respond rapidly

to pressure changes in the line.

14-3. Removal (Engine in Chassis).

a. Preparation.

(1)

Disconnect battery cables (refer to TM 9-2320-273-20).

(2)

Release air system pressure by opening petcock on air tank above the battery box.

(3)

Raise hood and secure in the UP position.

(4)

Drain engine coolant (refer to TM 9-2320-273-20).

(5)

Remove left front fender (refer to TM 9-2320-273-20).

b. Removal.

(1)

Remove accelerator return spring (refer to TM 9.2320.273.20)

0

(2)

Disconnect accelerator rod at fuel pump lever (refer to TM 9-2320-273-20).

(3)

Disconnect fuel inlet line at the fuel filter (refer to TM 9-2320-273-20).

(4) Disconnect tachometer cable (refer to TM 9-2320-273-20).

14-2