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 181 of 801

TM9-2320-273-34

(7) Oil Pump.

The oil pump is driven through a connection to the flywheel of the engine. The

oil pump:

clutch).

(a) Provides oil to fill the input clutch (centrifugal force works on this oil to engage the

(b) Provides oil for the lubrication of the clutches and brakes and to keep them cool.

(c) Provides oil for the lubrication of the gear group and to keep it cool.

(8) Ratio Selector.

The ratio selector (fig. 7-2) is in the truck cab and is connected to the

transmission with an umbilical cord containing 13 air lines. The operator moves the lever of the ratio

selector to make the selection of the desired gear ratio or transmission speed. The ratio selector then sends

air pressure signals through the correct air line to the transmission control. The ratio selector contains

the transmission air pressure charging valve.

Figure 7-2. Ratio Selector.

7-3