General Operating Instructions

Maintenance of the M939 Series Vehicles
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as hydraulic oil is forced through worm gears inside the winch motor.

(6) Clutch Lever. Manual control that engages the winch drum gear

to the drive gear of the winch motor.

(7) Control Linkage. Connects the winch control lever inside the

cab to the control valve.

Controls and Indicators. Before attempting to operate any piece

of M939 series equipment, be sure to be familiar with the location of

all controls and indicators.

Except where specifically noted, the

controls and indicators in this section of the lesson are generally

applicable to all vehicles of this series.

Therefore, only one

example will be used for the location and function description of the

following: chassis controls and indicators; body equipment controls

and indicators; and special kits controls and indicators.

When

additional information is required regarding specific vehicles

controls and indicators, refer to chapter 2 of TM 9-2320-272-10.

Chassis Controls and Indicators - Key Item and Function.

(1) Air Cleaner Indicator (figure 11 on the following page), shows

red when the engine air filter needs servicing.

(2) Parking Brake

Warning

Light,

illuminates

when

the

parking

brakes are engaged.

(3) Low Air Pressure Warning Light, illuminates when the air brake

system pressure drops below 50-60 psi.

(4) Spring Brake Warning Light, illuminates when the spring brakes

are engaged.

(5) Engine Hot Warning Light, illuminates when the engine coolant

temperature exceeds 200 F.