Caterpillar D3K, D4K and D5K: Maintenance (Every 250 Service Hours or Monthly)

Inspect

• Park the machine on level ground. Lower the dozer blade to the ground. Move the transmission control to the NEUTRAL position and engage the parking brake. Shut off the engine.

• Open the engine enclosure.

• Inspect the condition of the serpentine belt (1) for any of the following conditions: • excessive cracking • excessive wear • excessive damage

• The belt deflection should not be more than 14 to 20 mm (.56 to .81 inch) under 110 N (25 lb) of force. Use a 144-0235 Belt Tension Gauge in order to measure the tension.

• Note: The deflection of the serpentine belt has the same limit with an alternator only.

• Note: This machine is equipped with one belt tensioner (2). The belt tensioner automatically adjusts the belt to the correct position.

• Close the engine enclosure.

Engine Oil Sample - Obtain

• Open the left engine access door.

• Remove the lower service access door on left side of the machine. Refer to Operation and Maintenance Manual, “General Hazard Information” for information that pertains to containing fluid spillage.

• Obtain the regularly scheduled oil sample. a. Use the oil sampling valve. Refer to Special Publication, PEHP6001, “How To Take A Good Oil Sample”.

Final Drive Oil - Change

• Move the machine so that final drive oil level mark (3) is horizontal and final drive drain plug (1) is at the bottom of the final drive.

• Remove final drive drain plug (1) and allow the oil to drain into a suitable container.

• Clean drain plug (1) and replace the plug. Tighten the drain plug to a torque of 175 ± 15 N·m (130 ± 10 lb ft).

• Remove oil filler plug (2). Add oil until the oil is level with the plug threads. Refer to Operation and Maintenance Manual, “Lubricant Viscosities” and Operation and Maintenance Manual, “Capacities (Refill)”.

• Clean oil filler plug (2) and install the plug . Tighten the oil filler plug to a torque of 285 ± 30 N·m (210 ± 20 lb ft).

• Repeat this procedure for the other final drive.

Fuel Tank Water and Sediment - Drain

• Slowly, remove fuel tank cap (1) in order to relieve pressure.

• Remove plate (2). The drain valve for the fuel tank is located on the center of the machine below the fuel tank

• Perform the following procedure for a machine with a winch (if equipped). Remove plate (3). The drain valve for the fuel tank is located on the left side of the machine beneath the fuel tank.

• Note: Drain the fuel underneath the fuel tank when a rear attachment is installed on the machine.

• Open drain valve (4). Allow the water and the sediment to drain into a suitable container. Close drain valve (4).

Track Roller Frame - Inspect

• Inspect the track roller frame on both sides of the machine for cracks.

Winch Oil Level - Check

• Position the machine on a flat, level surface.

• Inspect the winch for leaks. Repair any leaks.

• Remove oil level check plug (2) for a quick check of the oil level.

• Note: The oil must be filled to the bottom of the port of the oil level check plug.

• Fill the winch case with oil until the oil is at the proper level.

• Install plug (2). Tighten to a torque of 175 ± 15 N·m (130 ± 10 lb ft).