777F OEM Off-Highway Truck Caterpillar

Note: In order to provide maximum sound suppression, keep all doors closed and keep all windows closed.

Note: Allow the engine to run for 45 seconds before depressing the service brake pedal or moving the transmission control out of PARK. This will allow the brake accumulators to fully charge in order to provide full braking capacity.

Note: Only operate the controls if the engine is running.

Preparing to Operate the Machine

1. In order to prevent injury, make sure that no one is working on the machine or near the machine. Keep the machine under control at all times in order to prevent injury.

2. Know the maximum height of the machine. Know the maximum width of the machine. Maintain proper clearance.

3. Only operate the machine if the engine is running.

4. Before the machine operates at a high speed, check the operation of the brake system and of the steering system. These systems should be checked while the machine maintains a low speed.

5. Make sure that the Automatic Retarder Control (ARC) operates properly before you travel down a grade with a machine that is loaded. Test the ARC on a short grade before the machine is loaded.

6. Reduce engine speed when you are maneuvering in tight quarters or when you are driving over a rise.

   Reference: For further operating information, See Operation and Maintenance Manual, "Operation Information".

Elevated Engine Idle

Low Temperature Warm-up

The low temperature warm-up feature will temporarily increase the low idle speed when the engine coolant is below normal operating temperature. Engine temperatures below normal operating temperature can decrease the engine life. This can become excessive in colder climates.

During initial start-up, the low temperature warm-up feature will accelerate engine warm-up and white smoke cleanup. The engine idle speed will automatically increase if the engine coolant does not come up to operating temperature within ten minutes after initial start-up. The engine will continue to run at the increased idle speed in order to bring the engine coolant up to operating temperature.

Extended periods of low engine idle can also result in lower coolant temperatures. During extended periods of low engine idle, the engine idle speed will automatically increase if the engine coolant drops below the operating temperature. This will maintain the engine coolant within the optimal operating temperature range.

The following conditions must be met in order for the low temperature warm-up feature to activate:

• The parking brake must be engaged.

• The transmission (actual gear) must be in NEUTRAL.

• The throttle position must be less than 25 percent.

• The coolant is below operating temperature.

Low Voltage

A low voltage condition will temporarily elevate the low idle speed in order to increase the output of the alternator.

The following conditions must be met in order for the low voltage condition to elevate the engine idle:

• The parking brake must be engaged.

• The transmission (actual gear) must be in NEUTRAL.

• The throttle position must be less than 25 percent.

• The battery voltage must be less than 24.5 volts for five minutes.

Warm-Up and Break-In of the Differential

Note: Correct oil levels are critical in the rear axle housing. Check the oil level prior to operation. Allow sufficient time for the oil to fill all of the compartments in the final drive housing. Allow sufficient time for the oil to fill all of the compartments in the differential housing.

Warm-Up

At start-up, operate the machine in fourth gear or in a lower gear until the oil is at 38°C (100°F). Allowing the oil to warm-up gradually permits bearing components to maintain optimum operating positions. High speeds during a cold start-up will cause the temperatures of the rotating components to be very different from the temperatures of the stationary components. High temperature differences within the bearing may result in less durability of the bearing component.

Break-In

The running surfaces of the gears and the bearings are conditioned during break-in. Break-in brings bearing components to optimum operating positions.

1. For 15 to 20 minutes, load the machine with 60% to 75% of the capacity.

2. Limit the top speed to fourth gear for approximately 15 to 20 minutes.

Placing a significant load on the bearing components at a lower speed creates a favorable condition of contact between the mating surfaces.