303 CR Mini Hydraulic Excavator Caterpillar


Hydraulic System Oil - Change

Usage:

303 DMA


  • Park the machine on level ground.


    Illustration 1g00825578

  • Extend the stick and the bucket fully. Lower the boom so that the bucket is rested on the ground. Lower the blade to the ground.


    Illustration 2g00846708

  • The hydraulic tank is located under the access cover on the right side of the machine. Open the access cover for the hydraulic tank. Clean the area around the hydraulic oil filler cap in order to prevent dirt from entering the hydraulic tank.


    Illustration 3g00846715

  • Relieve the internal pressure from the hydraulic tank by loosening the hydraulic oil filler cap. After the pressure is relieved, remove the hydraulic oil filler cap.


    Illustration 4g00825581
    The hydraulic oil drain plug is located on the bottom of the hydraulic oil tank.

    Note: Refer to Operation and Maintenance Manual, "General Hazard Information" for information on Containing Fluid Spillage.

  • Remove the hydraulic oil drain plug. Allow the oil to drain into a suitable container.

  • Clean the drain plug and the O-ring. Inspect the drain plug and the O-ring. Replace the drain plug or replace the O-ring if the drain plug or the O-ring is damaged or worn. Reinstall the plug.


    Illustration 5g00846733

  • Remove bolt (1), washer (2), and left cover (3).


    Illustration 6g00825618

  • Remove spring (4) and screen (5).

    Note: Do not allow spring (4) to fall into the hydraulic tank.



    Illustration 7g00825626

  • Clean screen (5) and inspect screen (5). Replace the screen if the screen is damaged or badly contaminated.

  • Inspect O-ring seal (6). Replace the O-ring seal if it is necessary.

  • Install the screen by reversing steps 7 and 8.

    Note: Make sure that the O-ring seal and the spring are properly positioned during installation.

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


    Illustration 8g00101462

  • Inspect the pressure cap. Clean the pressure cap. Replace the pressure cap if damage is evident.

  • Install the pressure cap.

  • Start the engine and run the engine for a few minutes. Slowly operate the control levers in order to cause the hydraulic oil to flow through the circuits.


    Illustration 9g00825578

  • Extend the stick and the bucket fully. Lower the boom so that the bucket is rested on the ground. Lower the blade to the ground.


    Illustration 10g00846755

  • Maintain the hydraulic oil level between mark (A) and mark (B) of the sight gauge.

  • Close the right access door.
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