TK741, TK751 and TK752 Track Feller Bunchers Machine Systems Swing Speed and Overswing on Level Ground - Check Caterpillar


Swing Speed and Overswing on Level Ground - Check
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Measuring the swing speed and the overswing of the machine will determine if there is a need to check the swing motor or the anti-reaction valve.

Note: The relief valve pressure setting must be set to the relief valve pressure specification before performing this operational check. Refer to Testing and Adjusting, "Piston Motor (Swing Drive) Relief Valve Pressure - Test and Adjust".

Table 1
Required Tools    
Part Number     Description     Qty    
5P-3277     Measuring Tape     1    
    Stopwatch     1    

  1. Start the engine.

  1. Position the machine on level ground.

  1. Fully raise the boom. Fully extend the stick. Keep the felling head in the vertical position.



    Illustration 1g00790167

    (A) Upper frame. (B) Undercarriage frame. (C) Marking.

  1. To indicate the relationship of the two positions, put a mark (C) on the inner race and the outer race of the swing bearing. The mark will be used as a target to stop the swing operation. Refer to Illustration 1.

  1. Move the swing control lever in either direction until the machine completes a 90 degree swing operation away from the target.

  1. Move the swing control lever in either direction until the machine completes a 90 degree swing operation toward the target. Return the swing control lever to the NEUTRAL position at the target.

  1. Measure the amount of overswing by measuring the distance between the marks on the swing bearing. Refer to Illustration 1.

    Note: Use a point that is visible from the operator seat as a reference point for the target.

    Table 2
    Overswing    
    Item     New    
    Right Swing    
    1173 mm (46.2 inch) or less    
    Left Swing    

  1. Move the swing control lever in each direction and measure the time that is required to complete three revolutions.

    Table 3
    Swing Time (3 revolutions)    
    Item     Time (seconds)    
    Counterclockwise     25    
    Clockwise    

  1. Fully retract the stick. Lower the felling head to the ground.

  1. Stop the engine.

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