325C Excavator Hydraulic System Swing Motor - Test - Measurement of Case Drain Oil Caterpillar

Swing Motor - Test - Measurement of Case Drain Oil

Table 1
Required Tools    
Part Number     Description     Qty    
6V-9830     Cap     1    
24 mm (0.94 inch)    
    Container for Measuring     1    


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. Stop the engine.

  1. Release the pressure in the hydraulic system. Refer to Testing and Adjusting, "Hydraulic System Pressure - Release".

    Illustration 1g00817458

    Swing motor compartment

    (1) Case drain hose

    (2) Tee

  1. Disconnect the case drain hose (1) from tee (2). Place the open end of the case drain hose (1) into the container for measuring.

  1. Install 6V-8398 O-Ring Seal and 6V-9830 Cap on tee (2) of the swivel.

    Illustration 2g00817473

    Pilot manifold

    (3) Connector

    (4) Solenoid valve for swing parking brake

  1. Disconnect connector (3) from solenoid valve (4) for the swing parking brake.

  1. Start the engine.

  1. Place the engine speed dial at position "10" and AEC switch OFF. Maintain the maximum no-load speed at 1870 ± 50 rpm.

    Reference: Refer to Testing and Adjusting, "Engine Performance - Test" for engine rpm settings.

  1. Increase the hydraulic oil temperature to 55° ± 5°C (131° ± 9°F).

  1. Slowly move the swing joystick and make sure that the swing parking brake is activated.

  1. Move the swing joystick fully for one minute. Measure the case drain oil.

  1. Stop the engine.

  1. Connect connector (3) to the solenoid valve for swing parking brake (4) .

  1. Repeat this test procedure three times in order to obtain three measurements. For each test procedure, swing the upper structure to a different position.

The following values specify the maximum acceptable flow of case drain oil when the swing relief pressure is set at 27500 ± 980 kPa (4000 ± 140 psi).

New swing motor ... 30 L/min (7.9 US gpm)
Rebuilt swing motor ... 35 L/min (9.2 US gpm)

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