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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, "Caterpillar Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Caterpillar 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 filter inlet pressure on the oil filter base. The oil filter base can be found in the back left hand side of the transmission.
Required Tools
| Required Tools | ||||
|---|---|---|---|---|
| Tooling | Item | Part Number |
Description | Qty |
| A | A1 | 169-8373 | Fluid Sampling Bottle | 1 |
Note: Use of an incorrect oil sampling needle will result in permanent damage to the sampling port.
Testing Procedure
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| Illustration 1 | g01346841 |
(1) Hydraulic oil contamination test port | |
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.
- Bronze colored particles give an indication of pump failure or motor port plate failure.
- Shiny steel particles give an indication of a gear or bearing failure.
- Plastic parts indicate a failure of the thrust washer.
- Rubber particles indicate a seal failure.
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.