Machine Preheaters for Wheel Harvesters Caterpillar

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Sudden movement or accidental starting of the machine can cause personal injury or death to persons on or near the machine. To prevent personal injury or death, perform the following: Park the machine on a smooth level surface. Lower the bucket and or attachments to the ground. Stop the engine and engage the parking brake. Block the wheels and install the steering frame lock. Turn the battery disconnect switch to the OFF position and remove the key. Place a Special Instruction, SEHS7332, "Do Not Operate" tag at the battery disconnect switch location to inform personnel that the machine is being worked on.

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Personal injury can result from hot coolant, steam and alkali. At operating temperature, engine coolant is hot and under pressure. The radiator and all lines to heaters or the engine contain hot coolant or steam. Any contact can cause severe burns. Remove filler cap slowly to relieve pressure only when engine is stopped and radiator cap is cool enough to touch with your bare hand. Cooling System Conditioner contains alkali. Avoid contact with skin and eyes.

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Personal injury or death can result from escaping fluid under pressure. Escaping fluid under pressure, even a very small pin-hole size leak, can penetrate body tissue and cause serious injury and possible death. If fluid is injected into your skin, it must be treated immediately by a doctor familiar with this type of injury. Always use a board or cardboard when checking for a leak.

Perform visual checks first when you are troubleshooting a problem. Before you make these checks, stop the engine. Shift the operating mode switch to the NEUTRAL position.

Check for leaks around the machine preheater. Check all oil lines, all hoses, and all connections for damage and for leaks. Look for coolant on the ground under the machine.

Electrical System

Intermittent electrical problems are often caused by poor connections. Use the following checks as a guideline for inspecting connectors:

1. Check the mating fit of the connectors.
   • Ensure that the locking rings lock in place.

   • Ensure that locking clips are used on Sure-Seal connectors.

   • Ensure that the screw in the center of the harness connector is tight.

   • Ensure that the connector pins and the connector receptacles are aligned correctly.

2. Check the wires at the connectors.
   • Ensure that the wires do not enter the back of the connector at an angle.

   • Ensure that each wire is properly crimped into the proper connector contact.

   • Ensure that each connector contact is properly locked into the connector body. When the connector contact is locked properly, the contact or the wire cannot be pulled out of the connector body without excessive force.

3. Check each wire for nicks and for signs of abrasion in the insulation.

4. Check for moisture at the connector. The following conditions are possible causes of moisture:
   • Connector seals are damaged or missing.

   • Plugs for the wire holes are loose or missing.

   • Wires do not enter the back of the connector straight. If the wires enter the connector at an angle, there may not be a good seal between the connector and the wire insulation.

   • Moisture from other connectors with poor seals may have travelled inside the wire insulation.

5. Check for contacts that are dirty or corroded.
   • Clean the contacts with a cotton swab or with a soft brush.

6. Check each connector pin and each connector receptacle.
   • Use a new connector pin and a new connector receptacle to check each connector contact for a snug fit. The new contact should stay connected if the connector is held with the contacts facing downward.