Caterpillar Off-higway Truck 771D

The remaining 10 Hours or Daily checks are performed in the operator's compartment. They are as follows:

- Indicators and gauges: Test operation

- Back-up alarm: Test operation

- Secondary steering: Test operation

The brakes are checked by engaging one of the brake systems and placing the shift lever in FIRST FORWARD.

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.

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

If 'Other' is selected, report to the maintenance team and stop the procedure

Hoist and brake hydraulic tank breather checked for plugging

Is oil flowing from the filter?

If 'Yes' is selected, the hoist and brake hydraulic tank may be overfilled. Report to the maintenance team.

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

Warning: This procedure requires trained personnel with PPE!

Supply oil for the transmission and the torque converter is contained in the torque converter case.

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.

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.;