938G Wheel Loader and IT38G Integrated Toolcarrier Hydraulic System Oil - Change Caterpillar


Hydraulic System Oil - Change
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1.1. Selection of the Oil Change Interval
2.2. Oil Filters
3.2. Oil
4.2. Monitoring the Condition of the Oil
5.2. Measured Data
6.1. Procedure for Changing the Hydraulic Oil

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.

Oil Filters

AVSpare 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.

  • AVSpare Hydraulic Oil HYDO

  • AVSpare Transmission/Drive Train Oil (TDTO)

  • AVSpare TDTO -TMS

  • AVSpare Diesel Engine Oil

  • AVSpare Biodegradable Hydraulic Oils HEES

  • AVSpare Multipurpose Tractor Oil (MTO)

  • Heavy-duty diesel engine oil with a minimum zinc content of 900 ppm

If AVSpare oils cannot be used, use heavy-duty oils with the following classification: Cat ECF-1, API CG-4, API CF and TO-4

These oils must have a minimum zinc additive of 0.09 percent (900 ppm).

Note: Industrial hydraulic oils are not recommended in AVSpare hydraulic systems.

Monitoring the Condition of the Oil

The oil should be monitored during intervals of 500 hours. AVSpare's standard S·O·S 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

An oil sampling program may be used to monitor the following information:

  • Significant changes in wear metals should be monitored. These metals include iron, copper, chromium, lead, aluminum, and tin.

  • Significant changes in the following metals should be monitored: 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 AVSpare machines that are operated in the field is ISO 18/15 or cleaner. The cleanliness should be monitored by particle count analysis. Contamination levels 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 2 cSt.

Procedure for Changing the Hydraulic Oil


NOTICE

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, "AVSpare Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on AVSpare products.

Dispose of all fluids according to local regulations and mandates.


Operate the machine for a few minutes in order to warm the hydraulic system oil.

Park the machine on level ground. Lower the bucket to the ground and apply slight downward pressure. Engage the parking brake and stop the engine.



Illustration 1g00110533

The hydraulic tank filler cap is located behind the cab on the top of the engine compartment. Use the steps and the handholds in order to reach the hydraulic tank filler cap. The steps and handholds are located on the left side of the machine.



Illustration 2g00566955

  1. Remove the hydraulic tank filler cap.

  2. Open the engine hood. The hydraulic tank drain valve is located on the right side of the machine.


    Illustration 3g00189295

  3. The hydraulic tank drain valve is located at the bottom of the hydraulic tank. Open the drain valve and allow the hydraulic oil to drain into a suitable container.


    NOTICE

    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.


  4. Close the drain valve.

  5. Replace the hydraulic system filter. Refer to Operation and Maintenance Manual, "Hydraulic System Oil Filter - Replace".

  6. Fill the hydraulic system oil tank. Refer to Operation and Maintenance Manual, "Lubricant Viscosities" and Operation and Maintenance Manual, "Capacities (Refill) ".

  7. Inspect the gasket on the hydraulic tank filler cap for damage. Replace the gasket, if necessary.

  8. Install the hydraulic tank filler cap.

  9. Start the engine and run the engine at low idle for ten to fifteen seconds.

  10. Shut off the engine.

  11. Refill the hydraulic tank to the full mark on the sight gauge.

  12. Restart the engine and run the engine at low idle. Cycle all the implements until all the systems are refilled.

    Note: If the warning light for a low oil level comes on during the cycling, stop the engine immediately and refill the hydraulic tank. If the filling procedure is done correctly, the warning light should never come on.



    Illustration 4g00243396

  13. After you have cycled the implements again, stop the engine and refill the hydraulic tank to the full mark on the sight gauge.

    Note: The oil must be free of bubbles. If bubbles are present in the oil, air is entering the hydraulic system. Inspect the suction hoses and hose clamps.

  14. If necessary, tighten any loose clamps and any loose connections. Replace any damaged hoses.

  15. Close the engine hood.

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