574B Forwarder Hydraulic System Visual Inspection Caterpillar


Visual Inspection
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1.1. Hydraulic System
2.1. Electrical System

------ WARNING! ------

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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------ WARNING! ------

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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------ WARNING! ------

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.

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NOTICE

Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.

Refer to Special Publication, NENG2500, "AVSpare Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on AVSpare products.

Dispose of all fluids according to local regulations and mandates.


When you diagnose a problem in the electrohydraulic system, a visual inspection of the system is the first step. Perform the following inspections:

Hydraulic System

  1. Check the oil level in the hydraulic oil tank.

  1. Look for air in the hydraulic tank oil immediately after the engine is stopped. Use a clear container to obtain a sample of the oil. Look for air bubbles in the oil in the container.

  1. Remove the oil filters and look for particles in the filter elements. A magnet will separate ferrous particles such as iron and steel from the nonferrous particles such as aluminum and rubber.

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

    • Metallic particles indicate the failure of a valve, the failure of a motor, or the failure of a pump.

  1. Check for flow restrictions in all oil lines. Flow restrictions include acute bends in the oil lines, clamps that are not installed correctly, and physical damage to hoses and to tubes. Check all connections for damage and for leaks.

  1. Check the tightening torques of all bolts on the hydraulic components and the connections for the hydraulic oil lines.

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.

  1. 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.

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

  1. 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.

  1. Check for contacts that are dirty or corroded.

    • Clean the contacts with a cotton swab or with a soft brush.

  1. 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.

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