305 CR Mini Hydraulic Excavator Hydraulic System Swing Speed and Swing Drift on a Slope - Check Caterpillar


Swing Speed and Swing Drift on a Slope - Check
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Measuring the swing speed on a slope will determine if there is a need to check the swing motor. Measuring the swing drift on a slope will determine if there is a need to check the swing parking brake.

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 (Engine Speed)" 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    
Description     Qty    
Measuring Tape     1    
Stopwatch     1    



Illustration 1g00816380

(A) 12°

  1. Complete the following steps in order to measure the swing speed on a slope.

    1. The bucket should be empty.

    1. Position the machine on a slope of 12 degrees. Refer to Illustration 1.

    1. Position the implements at maximum reach and close the bucket. Position the bucket above the ground so that the bucket will not come in contact with any obstacles.



      Illustration 2g00816391

    1. Position the upper structure at position (A). The upper structure should be at a 90 degree angle to the lower structure. Refer to Illustration 2.

    1. Measure the time that is required to swing the upper structure from position (A) to position (B) .

    1. Position the upper structure at position (C). The upper structure should be at a 90 degree angle to the lower structure.

    1. Measure the time that is required to swing the upper structure from position (C) to position (B).

      Table 2
      Swing Time (seconds)    
      Item     Specification    
      Right Swing     3.0 or less    
      Left Swing    

  1. Complete the following steps in order to measure the swing drift on a slope.

    1. Start the engine. Place the engine at the low idle position. Place the hydraulic activation lever in the unlocked position.

    1. Load the bucket.

      Weight of bucket load ... 180 kg (397 lb)

    1. Position the machine on a slope of 12 degrees. Refer to Illustration 1.



      Illustration 3g00816391

    1. Position the upper structure at position (A). The upper structure should be at a 90 degree angle to the lower structure. Refer to Illustration 3.



      Illustration 4g00293972

      (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. Refer to Illustration 4.

    1. Leave the machine in this position for three minutes. Measure the swing drift on the circumference of the swing bearing.

    1. Repeat Steps 2.e through 2.f with the upper structure at position (C). Refer to Illustration 3.

Table 3
Swing Drift mm (inch)    
Item     Specification    
Right Swing     0    
Left Swing    

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