Caterpillar Off-higway Truck 773D

Warning: Only trained personnel should perform this procedure

Sight gauges (1) present and functional

Fill tube (2) present and functional

Enter the initial oil level in the sump

Crank the engine for approximately 15 seconds

Enter the oil level in the sump after cranking

If the engine starts, do not allow it to run for more than 15 seconds

Enter the oil level in the sump after engine start

Crank the engine for an additional 15 seconds

Indicators and gauges: Test operation

Secondary steering: Test operation

Accelerate the engine until the truck moves. The truck must not move below 1200 rpm.

This procedure should be repeated for each brake lever or pedal.

See the Operation and Maintenance Manual for more information on the remaining tests performed in the cab.

Sign off on the truck inspection

The fuel tank is located on the left side of the truck. The fuel level sight gauge (1) is used to check the fuel level during the walk around inspection.

A fuel level sender is located on the fuel level sight gauge. The fuel level sender provides input signals to the Caterpillar Monitoring System or the attachment Vital Information Management System (VIMS) which informs the operator of the fuel level.

The percentage of sulfur in the fuel will affect the engine oil

recommendations. The following is a summary of fuel sulfur and oil recommendations:

1. Use API CG-4 performance oils.

2. With fuel sulfur below 0.5%, any API CG-4 oils will have a sufficient Total Base Number (TBN) for acid neutralization.

3. For fuel sulfur values above 0.5%, the new oil TBN should be a minimum of 10 times the fuel sulfur.

4. When 10 times the fuel sulfur exceeds the oil TBN, reduce the oil change interval to about 1/2 the normal change interval.

Open the drain valve (2) to remove condensation from the fuel tank.;

Warning: This maintenance check requires trained personnel with PPE!

Oil level checked with cold oil and the engine stopped

Oil level checked with warm oil and the engine running

Hoist and brake hydraulic tank breather checked for plugging

Is oil flowing from the filter?

If oil is flowing from the filter, the hoist and brake hydraulic tank may be overfilled

Hoist and brake cooling oil returns to the hydraulic tank through a screen located below cover

Diverter (towing) valve checked

Located near the air filters and the steering tank are the front and rear brake cylinders (1) and the brake oil makeup tank (2).

Inspect the condition of the breathers (3) for the brake cylinders.

Oil leaking from the breathers?

Oil leaking from the breathers is an indication that the oil piston seals in the brake cylinder need replacement.

Air flow from the breathers during a brake application?

Air flow from the breathers during a brake application is an indication that the brake cylinder air piston seals need replacement.

Is there air in the system or a loss of oil downstream from the cylinders?

If air is in the system or a loss of oil downstream from the cylinders occurs, the piston in the cylinder will overstroke and cause an indicator rod to extend and open the brake overstroke switch (4).

Did an overstroke condition occur?