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


Travel Motor - Test - Measurement of Case Drain Oil
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Table 1
Required Tools    
Part Number     Description     Qty    
FT-2547     Track block assembly     1    
6V-9509     Face Seal Plug     1    
6V-8398     O-Ring Seal     1    
    Remote drain hose with an inside diameter of
20 mm (0.79 inch)    
1    
    Wrench
29 mm (1.14 inch)    
1    
    Container for measuring     1    


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.


  1. Stop the engine.

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



    Illustration 1g00714531

    Sprocket (left track)

    (1) Sprocket

    (2) FT-2547 Track block assembly

  1. Place track block assembly (2) in sprocket (1) in order to block forward left travel. Refer to Illustration 1.



    Illustration 2g00714521

    Travel motor

    (3) 6V-9509 Face seal plug

    (4) 6V-8398 O-Ring seal

    (5) Case drain hose

    (6) Connector

    (7) Remote drain hose

    (8) Container for measuring

  1. Disconnect case drain hose (5) from connector (6). Install plug (3) and seal (4) in the open end of case drain hose (5) .

  1. Connect one end of remote drain hose (7) to connector (6). Place the other end of remote drain hose into the container (8) in order to measure the case drain oil.

  1. Start the engine.

  1. Place the engine speed dial at position "10" and AEC switch OFF. Maintain the maximum no-load speed at 1880 ± 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. Move the left travel lever forward fully for one minute.

  1. Measure the amount of case drain oil.

  1. Remove track block assembly (2) from sprocket (1) .

  1. Move the left travel lever in order to reposition the travel motor.

  1. Place track block assembly (2) in sprocket (1) in order to block forward left travel.

  1. Repeat Steps 9 through 13 in order to obtain three measurements of case drain oil.

The following values specify the maximum acceptable flow of case drain oil when the travel crossover relief valves are set at 36800 ± 1470 kPa (5350 ± 215 psi).

New travel motor ... 15 L/min (4.0 US gpm)
Rebuilt travel motor ... 18 L/min (4.8 US gpm)

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