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Make reference to the WARNINGS on the first several pages of the Testing And Adjusting section. |
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Hot oil and components can cause personal injury. Do not allow hot oil or components to contact skin. |
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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 Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on Caterpillar products. Dispose of all fluids according to local regulations and mandates. |
The machine hydraulic systems use hydraulic oil from the hydraulic tank. Caterpillar recommends the use of the S·O·S oil analysis program in order to monitor the condition of your equipment. Refer to Operation and Maintenance Manual, SEBU7371, "S·O·S Oil Analysis" for further information about this program.
If the oil becomes contaminated, premature component failure could result. Contaminated oil can also contribute to overheating. Use the following procedure to sample the oil in the system.
- Shift the transmission to the NEUTRAL position and engage the parking brake.
- Start the engine.
- Rotate the steering wheel in one direction for the entire distance of travel. Hold the steering wheel in this position for one minute in order to stall the pump. This procedure will help warm the oil.
- Actuate all cylinders through a minimum of ten full cycles.
- Turn the start switch to OFF.
- Remove the hydraulic filler cap.
- Draw a 50 mL (1.7 fl oz) oil sample from the hydraulic tank. The level of contaminants must be lower than the values in ISO 18/15. Oil samples can be obtained through the filler cap on the hydraulic tank. Use 1U-5718 Vacuum Pump, clean tubing, and a clean bottle in order to obtain a sample.
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| Illustration 1 | g00762276 |
Filler Cap (Hydraulic Oil) | |
| Hydraulic Oil Contamination | |
| Particle Size (Microns) | Maximum Number of Particles in a 50 mL (1.7 fl oz) sample |
| 10 to 20 | 48000 |
| 21 to 50 | 2580 |
| 51 to 100 | 150 |
| 100 or more | 20 |
If the hydraulic oil exceeds the specified amount of particles, remove the hydraulic filter. Cut the filter open and inspect the filter for particles. A magnet will separate ferrous particles from nonferrous particles. Nonferrous particles could include O-ring seals and gaskets. Consult your Caterpillar dealer for further instruction.