W345B Series II Excavator Hydraulic System Main Hydraulic Pump Air - Purge Caterpillar


Main Hydraulic Pump Air - Purge
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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, "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.


    ------ 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 1g00296490

    Pump compartment

    (1) Vent plug

  1. While the engine is stopped, remove vent plug (1) on the top of the main pump.

  1. Fill the main pumps with oil.

    Note: Leave vent plug (1) out of the pump for several minutes until the main pumps are filled with hydraulic oil.


    NOTICE

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


  1. Install vent plug (1). Tighten vent plug (1) and start the engine.

  1. Place the engine at high idle position and place the monitor in the power mode position.

  1. Raise the boom. Move the stick and move the grapple back and forth. The indicator light for the hydraulic tank pressure will turn off when the specified pressure is reached.

  1. Stop the engine and slowly lower the boom until the grapple is on the ground. This pressurizes the hydraulic tank.

  1. Slowly loosen vent plug (1) until oil begins to flow from the opening.

  1. Tighten the vent plug to the specified torque.

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