308C CR Excavator Hydraulic System – Swing Speed and Overswing on Level Ground – Check

Note: The engine speed and/or the machine configuration that is used during this test can affect the results of this test. Refer to Testing and Adjusting, “Engine Performance – Test” for the engine speed that was used for this test. Refer to Testing and Adjusting, “Operational Checks” for the machine configurations that were used for this test.

Note: The relief valve pressure settings must be set to the relief valve pressure specification before performing this operational check. Refer to Testing and Adjusting, “Specifications”.

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



Illustration 1 g00297618
  1. Position the machine on level ground. Refer to Illustration 1.
  1. Stop the engine.



    Illustration 2 g00293972

    (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 2.
  1. The bucket should be empty.
  1. Start the engine.
  1. Place the machine controls at the following settings: Engine speed dial “10” and Low idle switch OFF.
  1. Place the hydraulic activation control lever in the UNLOCKED position.
  1. Increase the hydraulic oil temperature to 55° ± 5°C (131° ± 9°F).
  1. Move the swing joystick in either direction until the machine completes a 180 degree swing operation away from the target.
  1. Move the swing joystick in either direction until the machine completes a 180 degree swing operation toward the target. Return the swing joystick 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 2.

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

    Table 2
    Overswing    
    Item     New     Rebuild     Service Limit    
    Right Swing     650 mm (25.6 inch) or less     710 mm (28.0 inch) or less     830 mm (32.7 inch) or less    
    Left Swing    

  1. Move the swing joystick in each direction and measure the time that is required to complete a 180 degree swing operation.

    Table 3
    Swing Time    
    Item     New     Rebuild     Service Limit    
    Right Swing     3.8 seconds or less     4.4 seconds or less     4.9 seconds or less    
    Left Swing