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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
This test will show the following conditions if the conditions exist:
- Oil pressure to the transmission lubrication circuit is good.
- The transmission lubrication relief valve is closed.
Required Tools
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| Illustration 1 | g01089423 |
Tooling (A) | |
Use the tools in Table 1 to complete the following test procedure.
| Required Tools (Pressure Gauges) | ||||
|---|---|---|---|---|
| Tool | Item | Part Number | Description | Qty |
| A | A1 | 6V-3989 | Fitting (Test) | 2 |
| A2 | 8T-0855 | Pressure Gauge | 2 | |
| A3 | 177-7861 | Hose As | 2 | |
| A4 | 6V-4143 | Coupler | 4 | |
| 186-2602 | Pressure Sensor 0 to 1000 kPa (0 to 145 psi) |
1 | ||
Test Procedure
Pressure gauges are used in the following test procedure.
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| Illustration 2 | g01329180 |
Pressure tap location for lubrication test | |
- Attach a coupler to the transmission lubrication pressure tap (1). If necessary, connect the pressure hose. Install a pressure gauge 400 kPa (58 psi) to the fitting.
- Start the engine and warm the oil up to 60 °C (140 °F).
- Run the engine at LOW IDLE rpm with the transmission control lever in the NEUTRAL position. The pressure on the gauge must be a minimum of 4 kPa (0.5 psi).
- Run the engine at HIGH IDLE with the transmission control lever in the NEUTRAL position. The pressure on the gauge must be 179 ± 27 kPa (26 ± 4 psi).
- When the test is complete, stop the engine and remove the test equipment.