Table 2-1. Controls and Instruments

TM 5-4320-234-12

1. Fuel tank level gage

2. Fuel tank filler cap

Figure 2-3. Fuel tank and related parts.

Table 2-1. Controls and Instruments

Fig. &

index No.

Name

Operation and use

2-1 1

Engine oil pressure safety switch

Automatically shuts down the unit when engine oil pressure falls below preset

level of the switch. Correct cause of trouble before restarting operation.

2-1 2

Coolant temperature safety switch

Automatically shuts down the unit when engine coolant temperature increases

above preset setting of the switch. Correct cause of trouble before restarting

operation.

2-1 3

Ammeter

Indicates rate of battery charge or discharge. Charging rate may be higher

immediately after starting but should taper off to near zero with continued

operation. Immediately check cause of discharge indication that occurs during

operation.

2-1 4

Coolant temperature gage

Indicates the temperature of engine coolant during operation. Normal operating

temperature reading is 180 to 200F.

2-1 5

Throttle control

Controls engine speed between idle and governed speed. When pulled out, it

causes the engine to operate at idle speed. When pushed in fully, it causes

engine to run at full governed speed. Intermediate settings provide intermediate

engine speeds.

2-1 6

Control panel lamp

Provides illumination for control panel when operating during hours of darkness.

2-1 7

Engine oil pressure gage

Indicates engine oil pressure. At idle, oil pressure must exceed 7 psi. At

governed speed, oil pressure must be 20 to 30 psi.

2-1 8

Choke control

When pulled out, the choke control supplies an extra-rich fuel mixture to the

engine to facilitate engine starting and warmup. When pushed in fully, it

restores normal fuel mixture for running the engine.

2-1 9

Suction gage

Compound gage indicates either vacuum or pressure condition at suction port

when suction gage valve is open. Indication depends upon specific operating

conditions.

2-1 10

Tachometer-hourmeter

Indicates the engine speed in hundreds of rpms. Normal governed speed rating is

2450 rpm. Engine speed at full load should not go beyond this level..

Hourmeter indicates engine running time based on operating speed (engine

revolutions x 100,000).

2-1 11

Discharge pressure gage

Indicates pump discharge pressure when discharge pressure gage valve is open.

High pressure indicates high discharge head or discharge line restriction.

Normal discharge pressure varies with operating conditions.

2-1 12

Starter pushbutton

When the battery disconnect switch and ignition switch are ON, pressing the

starter pushbutton energizes the engine starting motor to turn over the engine

for starting.

2-4