325C Excavator Hydraulic System Main Hydraulic Pump Air - Purge Caterpillar


Main Hydraulic Pump Air - Purge
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Table 1
Required Tools 
Part Number  Description  Qty 
6V-4143  Coupler(1) 
177-7860  Hose As 
(1) Install the coupler on one end of the hose assembly and leave the other end of the hose assembly open to the air.

When the main pumps have been serviced or the hydraulic oil has been replaced, remove the air from the hydraulic system. Remove the air from the hydraulic system in the following manner:


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

Dispose of all fluids according to local regulations and mandates.


------ WARNING! ------

Personal injury can result from hydraulic oil pressure and hot oil.

Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system.

Make sure all of the work tools have been lowered to the ground, and the oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand.




    Illustration 1g00816860
    Pump compartment
    (1) Connector
    (2) O-Ring seal
    (3) Case drain hose
    (4) Negative flow control hose

  1. While the engine is stopped, disconnect hose (3) from connector (1).

  2. Remove connector (1) and O-Ring seal (2) from the pump housing.

  3. Fill the main pumps with oil.

  4. Install new O-Ring seal (2) and connector (1) at the pump housing.

  5. Connect hose (3) to connector (1). Tighten hose (3) to the specified torque.


    NOTICE

    To avoid system damage, make sure that the hydraulic pump is properly filled with hydraulic oil before start-up.


  6. Start the engine.

  7. Place the engine at low idle position. Raise the boom and hold the boom in this position.

  8. Slowly loosen hose (4) until oil begins to flow around the hose connection.

  9. Tighten hose (4) to the specified torque.

  10. Stop the engine and slowly lower the boom until the work tool is on the ground. This pressurizes the hydraulic tank.


    Illustration 2g00816865
    (5) Pressure tap

  11. Connect 6V-4143 Coupler and 177-7860 Hose As to pressure tap (5) until oil begins to flow from the open end of the hose.

  12. Remove the quick coupler from pressure tap (5).

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