PREPARATION FOR STARTING.

TM 10-3930-623-34

7-79. START UP AND BREAKING IN

8. After five minutes of running at fast idle, shut

NEWLY OVERHAULED ENGINE.

down engine. Recheck oil level in crankcase and bring

oil level up to full mark.

CAUTION

The hydraulic reservoir, transmission,

master brake cylinder and radiator

NOTE

must be filled as well as the engine oil

During shut down check all systems

level checked before starting engine.

for leaks and refill as necessary to

The hydraulic reservoir provides the

bring levels to full mark.

required hydraulic pump lubrication.

9. Restart engine and run at 800 rpm until engine

reaches normal operating temperature.

7-80. PREPARATION FOR STARTING.

10. With warm engine, operate at 450 rpm and

1. Fill engine oil galleries with pressure oiler to

adjust carburetor idle mixture for smoothest running of

insure full supply of oil in system.

engine and check ignition timing with timing light.

2. Remove hydraulic pump intake hose at the

reservoir end and fill hose with correct hydraulic oil.

7-82. BREAK-IN PROCEDURES . Engine must be

Connect hose to reservoir.

operated in a prescribed manner during the first few

3. Connect battery (59, figure 4-9) to electrical

hours after an overhaul or rebuild to insure proper

system.

seating of piston rings, to provide required oil control and

4. Fill fuel tank.

compression. Break-in may be accomplished either with

engine installed in truck or where available, on an engine

dynamometer.

7-81. STARTING ENGINE.

1. Place directional control lever in neutral position.

7-83. BREAK-IN OF INSTALLED ENGINE.

Apply parking brake.

2. Depress accelerator pedal approximately 1/3.

1. Drive truck as in normal use, but do not exceed

3. Pull choke control out fully.

one-half load for first two hours operation.

2. At no time cause engine to lug during run-in.

Engine is lugging when it does not respond to further

NOTE

opening of throttle.

Usage of full choke will

assist

priming fuel pump and

filling

carburetor float chamber.

CAUTION

Observe that oil pressure remains in

4. Turn on ignition switch and press starter button.

the normal range, and that engine

does not overheat.

Shut down

NOTE

engine

immediately

any

If starter does not turn, check neutral

malfunction develops, and correct

safety switch adjustment to insure it

trouble

before

continuing

this

closes in neutral position.

See

procedure.

paragraph 7-75.

7-84. BREAK-IN OF ENGINE ON DYNAMOMETER.

5. If engine does not immediately fire, hold starter

Install engine on dynamometer and connect hydraulic

button at least 15 seconds. If engine still has not started

system to hydraulic pump according to dynamometer

release starter and wait at least two minutes before

manufactures instructions. Operational steps are listed

retrying to start engine.

in figure 7-9.

6. As engine fires, open choke as necessary to

7-85. OPERATIONAL TESTS AND ADJUSTMENTS.

prevent flooding.

7-86. TRANSMISSION.

7. Idle engine at approximately 700 rpm for a few

minutes to warm and circulate the oil.

NOTE

Check transmission fluid level with

NOTE

engine operating at idle and

Observe oil pressure gage.

Shut

transmission in neutral. Add fluid as

down engine if gage fails to show

necessary.

required pressure. Warm idle speed

pressure is 7 psi minimum while at

operating speeds it is 20-30 psi.

7-20