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Escaping fluid under pressure, even a pinhole size leak, can penetrate body tissue, causing 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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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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| NOTICE |
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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, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat products. Dispose of all fluids according to local regulations and mandates. |
Introduction
The following tests are used to obtain a scheduled oil sample of the hydraulic system by use of the scheduled oil sampling port that is located on the filter base.
Note: If insufficient oil pressure is measured anywhere in the transmission hydraulic control system, test the pressure of the oil filter at the inlet of the oil sampling port. The oil filter base can be found below the torque converter housing.
Required Tools
| Required Tools | ||||
|---|---|---|---|---|
| Tooling | Item | Part Number |
Description | Qty |
| A | A1 | 183-7264 | Fluid Sampling Valve Assembly | 1 |
Note: Use of an incorrect oil sample needle will result in permanent damage to the sampling port.
Testing Procedure
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| Illustration 1 | g03095956 |
If the oil becomes contaminated, premature component failure could result. Contaminated oil can also contribute to overheating.
Use the following procedure to determine the contamination of the oil in the hydraulic system.
The scheduled oil sample can be taken from scheduled oil sampling tap (1) at the oil bypass valve.
- Start the engine. Warm up the oil until the oil reaches 47 °C (116 °F).
- Ensure that the transmission control is in the NEUTRAL position and place the throttle in the LOW IDLE position.
- Remove the cap. Obtain an oil sample from the scheduled oil sampling tap (1) by using tooling (A) .
- Stop the engine.
- Check the hydraulic filter element for foreign materials.
- Shiny steel particles give an indication of a gear or bearing failure.
- Plastic parts indicate a failure of the thrust washer.
- Friction material
- Rubber particles indicate a seal failure.
- Check the screen for the pump inlet and the magnet.
Note: If any of these particles are found in the hydraulic filter element, all components of the hydraulic oil system must be cleaned. Do not use any damaged parts. Any damaged parts must be removed, and new parts must be installed.
- Replace any damaged parts.
- Replace the hydraulic filter element.