| 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. |
Selection of the Oil Change Interval
Your machine may be able to use a 4000 hour interval for the hydraulic oil. The hydraulic oil is in the system that is not integral to the service brakes, the clutches, the final drives, or the differentials. The standard change interval is 2000 hours. The oil should be monitored during intervals of 500 hours. The extended 4000 hour interval can be used if the following criteria are met.
Note: The hydraulic oil must be changed at least one time each year. This must be observed regardless of the 4000 hour interval.
Oil Filters
Caterpillar oil filters are recommended. The interval for changing the oil filter should be 500 hours.
Oil
The 4000 hour interval for changing the oil is for the following oil types.
- Caterpillar Hydraulic Oil HYDO
- Caterpillar Biodegradable Hydraulic Oils HEES
Note: Industrial hydraulic oils are not recommended in Caterpillar hydraulic systems. These oils are more likely to cause corrosion and excessive wear.
Monitoring the Condition of the Oil
The oil should be monitored during intervals of 500 hours. Caterpillar's standard SOS Fluids Analysis or an equivalent oil sampling program should be used.
The current guidelines for cleanliness of the oil should be observed. Refer to "Measured Data".
If an oil sampling program is not available, the standard 2000 oil change interval should be used.
Measured Data
The following information should be monitored by using a program for sampling the oil. The following information contains condemnation and oil management parameters.
- Significant changes in wear metals should be monitored. These metals include iron, copper, chromium, lead, aluminum, and tin.
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- Contaminants should not be present. These contaminants include fuel and antifreeze. Water content should be .5 percent or less.
- The silicon level should not exceed 15 parts per million for new oil. The particle counts should be monitored.
- The recommended level of cleanliness for Caterpillar machines that are operated in the field is ISO 18/15 or cleaner. The cleanliness should be monitored by particle count analysis. The levels of contamination should not exceed the normal level by more than two ISO codes. Action should be taken in order to determine the cause of the contamination. The system should be returned to the original levels of contamination.
- There should not be significant changes in sodium, silicon, copper, and potassium.
- The allowable level of oxidation is 40 percent (0.12 Abs units).
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Procedure for Changing the Hydraulic Oil
Note: Some machines may be equipped with a breaker relief valve on the hydraulic tank.
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| Illustration 1 | g00873864 |
The hydraulic tank is located on the left side of the machine.
- Operate the machine for a few minutes in order to warm the hydraulic oil. Park the machine on level ground and engage the parking brake.
- Remove drain plug (1) on the bottom left side of the hydraulic tank. Allow the hydraulic oil to drain into a suitable container.
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| Illustration 2 | g00557366 |
| NOTICE |
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Never start the engine while the hydraulic oil tank is being drained or while the hydraulic oil tank is empty. Excessive wear and damage to the hydraulic components can occur. |
Note: If the hydraulic tank is equipped with an ecology drain valve, attach a hose to a 126-7914 Oil Drain Coupling. Install the threaded end of the coupling into the drain valve in order to unseat the internal drain valve.
- Clean the area around the drain plug.
- Clean the drain plug and install the drain plug. Torque the drain plug to 100 ± 10 N·m (75 ± 7 lb ft).
- Fill the hydraulic oil tank with new hydraulic oil through fill coupling (2) .
Note: The implement hydraulic tank should be filled by using coupling (2). This will ensure that the new oil will pass through the implement return filter.
If the hydraulic tank is equipped with an electric fill pump, attach the hose to coupling (2). Place the end of the other hose in the new hydraulic oil.
Move toggle switch (3) to the down position in order to activate the pump. Move toggle switch (3) to the up position in order to deactivate the pump. Hold down switch (3) in order to pump the oil into the hydraulic tank.
If the hydraulic tank is not equipped with an electric fill pump, a manual pump will be available for use.
Reference: Refer to Operation and Maintenance Manual, "Lubricant Viscosities and Refill Capacities" for the correct type of lubricant and for the capacity of the hydraulic tank.
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| Illustration 3 | g00557369 |
- For machines that are equipped with a hydraulic tank breather, follow step 7 and step 8. For machines that are equipped with a breaker relief valve, follow step 8.
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| Illustration 4 | g00557487 |
Hydraulic Tank with Vacuum Pump | |
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| Illustration 5 | g00528845 |
Hydraulic Tank without Vacuum Pump | |
- Remove breather cap (4). Clean the breather cap in a clean, nonflammable solvent. Install the breather cap.
- Remove the hose from coupling (2) .
- Operate the machine for a few minutes. Check the oil level in the hydraulic tank.
Reference: Refer to Operation and Maintenance Manual, "Hydraulic System Oil Level - Check" for the correct procedure.