Caterpillar Off-higway Truck 769D

Warning: This procedure requires trained personnel with PPE!

Sight gauges (1) are used to check the oil level for the transmission and the torque converter.

Transmission and torque converter oil is added at the fill tube (2).

When filling the transmission and torque converter oil sump after an oil change, fill the sump with oil to the top of the upper sight gauge.

Crank the engine for approximately 15 seconds. The oil level will decrease as oil fills the transmission and torque converter system.

If the engine starts, do not allow it to run for more than 15 seconds. Add more oil to the sump to raise the oil level to the FULL COLD mark.

Crank the engine for an additional 15 seconds. Repeat this step as required until the oil level stabilizes.

Start the engine and warm the transmission and torque converter oil.

Add more oil to the sump as required to raise the transmission and torque converter oil level to the FULL WARM mark with the engine running.

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 should not leak 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 is an indication that the brake cylinder air piston seals need replacement.

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).

The switch provides an input signal to the Caterpillar Monitoring System or the VIMS which informs the operator of the condition of the service/retarder brake oil circuit.

If an overstroke condition occurs, the problem must be repaired and the indicator rod pushed in to end the warning.

Sign off on the brake master cylinders maintenance

Warning: This maintenance check requires trained personnel with PPE!

Is the oil level checked with cold oil and the engine stopped?

Is the oil level checked with warm oil and the engine running?

Does TDTO TO-4 provide maximum frictional capability required for clutch discs used in the brakes?

Does it increase brake holding capability by reducing brake slippage?

Is the hoist and brake hydraulic tank breather (2) checked for plugging?

Fuel tank is located on the left side of the truck

Fuel level sight gauge (1) functional during walk around inspection

Fuel level reading from the fuel level sender

Fuel sulfur percentage affects engine oil recommendations

Select the type of oil used based on fuel sulfur percentage

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

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