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Sudden movement or accidental starting of the machine can cause personal injury or death to persons on or near the machine. To prevent personal injury or death, perform the following: Park the machine on a smooth, level surface. Lower the work tool to the ground and engage the parking brake. Stop the engine and remove the key. Block the wheels and install the steering frame lock. |
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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. |
| Hydraulic Oil Contamination | ||
| ISO Code | Particle Size (Microns) | Maximum Number of Particles Per 1 mL Sample |
| 18 | 5 | 2500 |
| 15 | 15 | 320 |
Note: The concentration of the particles by size should be monitored over a series of samples. This information can be used in order to spot abnormal wear before a failure occurs. A spectrographic analysis of the samples can be used in order to identify the composition of the particles. The analysis of the oil sample may be used in order to identify the components that are failing.
The hydraulic oil in this system is SAE 10. If the oil becomes contaminated, premature component failure could result. Contaminated oil can also contribute to overheating. Use the following procedure in order to sample the oil for the implement system.
| Required Tools | |
| Part Number | Description |
| 8T-9208 | Probe Assembly |
| 5P-6442 | Hose |
Before proceeding to the test procedure that follows, complete the procedures:
Reference: For additional information about preparing the machine for troubleshooting the machine, refer to the Service Manual module Testing and Adjusting, "Machine Preparation for Troubleshooting" for the machine that is being serviced.
- Start the engine and run the engine at high idle. Allow the oil temperature to reach the normal operating temperature.
- Move all cylinders through a minimum of ten full cycles.
- Turn the key start switch to the OFF position.
- Turn the key start switch to the ON position. Move all control levers through all positions in order to release any pressure in the hydraulic system.
- Pump the brake pedal enough times in order to release the pressure in the brake system.
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Illustration 1 g03674263 - Purge the fluid sampling valve. Insert an 8T-9208 Probe Assembly into the fluid sampling valve. Draw a 50 mL oil sample through the fluid sampling valve into a suitable container. The level of contaminants must be lower than the values in the specifications table.
Note: Use approximately
150 mm (6 inch) length of tube on the end of the probe.Reference: Refer to Special Publication, PEHP6001, "How To Take A Good Oil Sample" for more information about obtaining an oil sample.
- Start the engine and allow the engine to run at low idle.
Note: Do not operate the hydraulic controls.
- Draw a 50 mL oil sample through the fluid sampling valve. The level of contaminants must be lower than the values in the specifications table.
