550 Wheel Harvester, 570 Wheel Harvester and 580 Wheel Harvester Power Train 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 hydraulic oil pressure and hot oil. Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system. Make sure all of the attachments have been lowered, oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand.

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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. During these checks, use a magnet to separate ferrous particles (iron) from nonferrous particles (O-ring seals, aluminum, bronze, etc), if necessary.

Hydraulic System

1. Check for oil leaks around the travel motors.

2. Check all oil lines, all hoses, and all connections for damage and for leaks. Look for oil on the ground under the machine. Check the pumps and the valves for external leaks.

   Note: If oil can leak out of a fitting or out of a connection, air can leak into the system. Air in the system is as harmful as having too little oil.

3. Take a sample of oil from the hydraulic system and pump drive in order to determine the oil condition. Test the oil sample.

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Illustration 1	g00599783
Location of Case Drain Filter (Power Train)

4. Remove the case drain filter (power train) and inspect the filter for foreign material. (Cut the filter open, if necessary.)

   Note: There is an oil filter bypass valve on the inlet side of the case drain oil filter. The bypass valve is a oil pressure valve. Whenever the pressure difference between the inlet oil and the outlet oil is more than 145 ± 30 kPa (21 ± 4 psi), the oil pressure valve will open and oil will be allowed to bypass the oil filter element. Any oil that does not flow through the oil filter element flows directly into the hydraulic tank. This dirty oil can cause valves to become stuck and valve orifices could become restricted.

   1. Rubber particles indicate a seal failure or a hose failure.

   2. Shiny steel particles indicate a mechanical failure of the travel motor or of a pump.

   3. A thick accumulation of fibrous material indicates worn brake discs in the travel motors.

   4. Iron particles or steel particles indicate broken components in the travel motors.

      Note: If any of these particles are found during any visual check, all components of the power train hydraulic system must be cleaned. Do not use any damaged parts. Any damaged parts must be removed and new parts must be installed.

IQAN Control and Monitoring System

The IQAN monitors the condition of the machine and the operation of the machine. The IQAN also allows you to test the electrical signals that are outputs from the IQAN.

The following conditions must exist in order for the power train system to function correctly:

• The IQAN must receive the correct electrical signal from the switch, the joystick control, a pressure sensor, the accelerator pedal, a temperature sensor or the engine control (ECM).

• The solenoid must receive the correct electrical signal from the IQAN.

Electrical System

Check the fuses.

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.

   • The connector housing is broken or cracked.

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.

   • Check the diode, if the diode is mounted in the connector.