966G and 972G Wheel Loaders 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 and 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 oils with a minimum zinc content of 900 ppm (CF, CF-4, CG-4, and CH-4)

Note: Industrial hydraulic oils are not recommended in AVSpare 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. AVSpare'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 through sampling of the oil:

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

  • Significant changes in the following additives 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. The levels of contamination should not exceed the normal 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 of 100 °C (212 °F) should not exceed a 2 cSt change from new.

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 Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on AVSpare products.

Dispose of all fluids according to local regulations and mandates.


  1. Operate the machine in order to warm the hydraulic oil.

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



    Illustration 1g00765367

  1. The hydraulic tank is located on the right side of the machine. Press the button on the breaker relief valve (1) in order to relieve any tank pressure.

  1. Remove the hydraulic tank filler cap (2) and the filler strainer (3). Wash the filler cap and the strainer in a clean, nonflammable solvent. Install the strainer.

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

  1. Remove the drain plug (5) from the bottom of the hydraulic tank. Wash the drain plug in a clean, nonflammable solvent.

  1. 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.


    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.


  1. Close the drain valve. Install the drain plug.

  1. Change the hydraulic oil filter.

    Reference: Refer to Operation and Maintenance Manual, "Hydraulic System Oil Filter - Replace" for the correct procedure.

  1. Fill the hydraulic tank with clean oil. Make sure that the oil level is at the "FULL" mark on the sight gauge (4). Install the filler cap.

    Reference: Refer to Operation and Maintenance Manual, "Lubricant Viscosities and Refill Capacities" for the correct type of oil and for the correct amount of oil.

  1. 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 at the "FULL" mark on the sight gauge. Install the filler cap.

  1. Start the engine and run the engine at low idle. Cycle the implements so that all hydraulic systems are filled with oil.

    Note: If the alert indicator for a low oil level comes on, stop the engine and immediately add oil to the hydraulic tank. The oil level should not be below the suction ports in the hydraulic tank while the engine is running.

  1. Add hydraulic oil to the tank until the oil level is at the "FULL" mark on the sight gauge.

  1. Stop the engine. Top off the hydraulic tank so that the oil level is at the "FULL" mark on the sight gauge. Install the filler cap.

    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.

  1. If necessary, tighten any loose clamps or any loose connections. Replace any damaged hoses.

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