IT38G Series II Integrated Toolcarrier and 938G Series II Wheel Loader Machine Preparation for Troubleshooting Caterpillar


Machine Preparation for Troubleshooting
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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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------ WARNING! ------

Sudden movement of the machine or release of oil under pressure can cause injury to persons on or near the machine.

In order to prevent possible injury, perform the following procedure before testing and adjusting any of the machine hydraulic systems.

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

Personal injury or death can result from sudden movement of the lift or tilt cylinders.

Sudden movement up or down, can cause the clearance above your head to change rapidly.

Do not stand under the lift arms when testing and adjusting the lift cylinders.

Do not stand under the bucket when testing or adjusting the tilt cylinder.

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

Personal injury or death can result from sudden movement of the lift cylinders or the tilt cylinders. Do not stand under the work tool when you are testing or adjusting the lift cylinders or the tilt cylinders.

Do not stand under the lift arms when you are testing or adjusting the lift cylinders or the tilt cylinders.

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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.


  1. Park the machine on a smooth, level surface. Move the machine away from other operating machines and away from personnel. Lower the work tools to the ground. Turn the engine start switch to the OFF position.

  1. Permit only one operator on the machine. Keep all other personnel away from the machine or in sight of the operator.

  1. Engage the parking brake. Put blocks in front of the wheels and behind the wheels.



    Illustration 1g00931610

  1. Position the steering frame lock in the LOCKED position so the machine can not articulate.

  1. Depress the brake pedal repeatedly. This will relieve any pressure that may be present in the brake hydraulic system.

  1. Move the implement control levers through the full range of travel. This will relieve any pressure that may be present in the implement hydraulic system. Place the lift control lever in the HOLD position. Place the tilt control lever in the HOLD position.

  1. Turn the steering wheel several times in both directions in order to relieve the pressure in the steering system.

  1. In order to relieve all of the pressure in the hydraulic oil tank, press and hold down the plunger on the breaker relief valve. The breaker relief valve is located on the top of the hydraulic oil tank.

    Note: If the machine is not equipped with a hydraulic tank breaker relief valve, the hydraulic tank cap may be removed slowly in order to relieve tank pressure.

The 8T-5320 Hydraulic Test Group or 1U-5481 Pressure Gauge Group may be used to test the hydraulic system pressure. For some tests, a magnet and a measuring rule may be used.

When any test is performed on the hydraulic system, the hydraulic oil must be at the normal operating temperature.

During a diagnosis of the hydraulic system, remember that correct hydraulic oil flow and correct hydraulic pressure are necessary for correct machine operation. The pump output increases as the engine speed increases. The pump output decreases as the engine speed decreases. Oil pressure is caused by resistance to the flow of oil.

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