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 in additional increments of 500 hours. The extended 4000 hour interval can be used if the following criteria are met.
Cat HYDO Advanced 10 is the preferred oil for use in most Caterpillar machine hydraulic and hydrostatic transmission systems when ambient temperature is between
Caterpillar oil filters are recommended. The interval for changing the oil filter should be 500 hours.
The 6000 hour interval for changing the oil is specific to HYDO Advance 10.
The 4000 hour interval for changing the oil is for the following oil types.
- Cat Hydraulic Oil (HYDO)
- CatTransmission/Drive Train Oil (TDTO)
- Cat TDTO-TMS
- Cat Diesel Engine Oil
- Cat Biodegradable Hydraulic Oil (HEES)
- Cat Multipurpose Tractor Oil (MTO)
- Heavy-Duty Diesel Engine Oil with a minimum zinc content of 900 parts per million (ppm)
Heavy-duty oils are identified by the following classifications: ECF-1, CG-4, CF and TO-4.
Note: Industrial hydraulic oils are not recommended for use 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 S·O·S Fluids Analysis or an equivalent oil sampling program should be used.
If an oil sampling program is not available, the standard 2000 oil change interval should be used.
The following information should be monitored when you sample the oil:
- Significant changes in wear metals should be monitored. These metals include iron, copper, chromium, lead, aluminum, and tin.
- The following additives should be observed for significant changes: Zinc, calcium, magnesium and phosphorus.
- 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 normal levels 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).
- The kinematic viscosity at
100 °C (212 °F) should not exceed a 2 cSt change.
Procedure for Changing the Hydraulic Oil
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Care must be taken to ensure that all fluids are contained during performance of inspection, maintenance, testing, adjusting and the repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Dispose of all fluids according to local regulations and mandates. |
Note: Be sure that you obtain an S·O·S hydraulic oil sample before you drain the hydraulic oil.
- Operate the machine in order to warm the oil.
- Park the machine on level ground. Lower the work tool to the ground with a slight downward pressure. Engage the parking brake and stop the engine.
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Illustration 1 g01237676 - Open the access door on top of the engine compartment.
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Illustration 2 g01237678 - Push the button on the top of breaker relief valve (1) in order to relieve any tank pressure.
- Remove hydraulic tank filler cap (2). Remove the strainer from the tube.
- Wash the strainer and the filler cap in a clean, nonflammable solvent.
- There is an ecology drain for the implement hydraulic tank that is located in the service center. Remove the drain plug and drain the oil. Allow the oil to drain into a suitable container.
- Clean the drain plug and install the drain plug.
- Install the filler strainer.
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Illustration 3 g01237715 - Fill the hydraulic oil tank with
475 L (125 US gal) of clean oil. Make sure that the oil level is within the green range (A) on the sight gauge. - Start the engine and run the engine for at least ten seconds. Then, stop the engine and add hydraulic oil to the tank until the oil level is in the green range (A) on the sight gauge.
- Start the engine and run the engine at low idle. Cycle the implements so that all hydraulic systems are filled with oil.
- Stop the engine and top off the hydraulic tank so that the oil level is within the green range (A) on the sight gauge.
Note: The oil must be free of air bubbles. If air bubbles are present in the hydraulic oil, air is entering the hydraulic system. Inspect the hydraulic suction line and the hose clamps.
- If necessary, tighten any loose clamps or any loose connections. Replace any damaged hoses.
- Inspect the gasket on the hydraulic tank filler cap for damage. Replace the gasket, if necessary. Install the filler cap.
- Stop the engine. Close the access door.
If your machine is equipped with a deluxe service center, you may add the hydraulic oil through a fast fill port.
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| Illustration 4 | g01432631 |
- Remove the dust cover (3).
- Attach the hose to the male coupling. Use a 127-9088 Nozzle for this port.
- Add the oil, as needed.
Reference: For more information, refer to Operation and Maintenance Manual, "Service Center"