325C and 325C L Excavator Hydraulic System Oil Filter (Case Drain) - Replace Caterpillar


Hydraulic System Oil Filter (Case Drain) - Replace
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    Illustration 1g00101435

  1. Park the machine on level ground. Lower the bucket to the ground so that the stick is vertical.



    Illustration 2g00811329

  1. Move the lever for the hydraulic lockout control to the UNLOCKED position.

  1. Turn the engine start switch to the ON position.

  1. Move the joysticks and the travel levers/pedals to the full stroke positions in order to relieve the pressure in the pilot lines.

  1. Turn the engine start switch to the OFF position and return the lever for the hydraulic lockout control to the LOCKED position.



    Illustration 3g00687449

  1. Slowly loosen the fill/vent plug on top of the hydraulic tank in order to relieve the internal pressure of the hydraulic tank.

  1. After the pressure is relieved, tighten the fill/vent plug.



    Illustration 4g00101497

  1. Open the access door on the right side of the machine.



    Illustration 5g00687481

    The case drain filter is located near the pilot oil filter.

  1. Clean the area in order to keep dirt out of the filter base.

  1. Remove the used case drain filter from the filter base.

    Note: This element is a cartridge type filter. The element cannot be reused.

    Note: Used filters should always be disposed of according to local regulations.

  1. Clean the filter base.



    Illustration 6g00101502

  1. Coat the seal of a new case drain filter with clean hydraulic oil. Install the new case drain filter in the filter base. Tighten the case drain filter hand tight.

  1. Start the engine and operate the machine slowly for 10 to 15 minutes. Move each cylinder evenly through several cycles.



    Illustration 7g00101508

  1. Return the machine to the position that is shown in Illustration 7. Check the machine for oil leaks.

  1. Stop the engine.



    Illustration 8g00687286

    (A) High temperature range

    (B) Low temperature range

  1. Maintain the oil level in the low temperature range for a cold machine. Maintain the oil level in the high temperature range for a machine that is at a normal operating temperature.



    Illustration 9g00687449

  1. Slowly loosen the fill/vent plug in order to relieve any pressure. Remove the fill/vent plug in order to add oil, if necessary.

  1. Clean the fill/vent plug. Install the fill/vent plug.

  1. Close the access door.

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