Swing Speed and Overswing on Level Ground - Check
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. The fine swing control switch (if equipped) must be in the OFF position.
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".
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Required Tools     | ||
---|---|---|
Part Number     | Description     | Qty     |
5P-3277     | Measuring Tape     | 1     |
    | Stopwatch     | 1     |
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Illustration 1 | g00297618 |
- Position the machine on level ground. Refer to Illustration 1.
- Stop the engine.
- 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.
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Illustration 2 | g00293972 |
(A) Upper frame (B) Undercarriage frame (C) Marking |
- The bucket should be empty.
- Move the swing joystick in either direction until the machine completes a 180 degree swing operation away from the target.
- 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.
- 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.
Show/hide tableTable 2 Overswing     Item     New     Rebuild     Service Limit     Right Swing    
1200 mm (47.2 inch) or less    
1300 mm (51 inch) or less    
1500 mm (59 inch) or less    Left Swing    
- Move the swing joystick in each direction and measure the time that is required to complete a 180 degree swing operation.
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Table 3 Swing Time     Item     New     Rebuild     Service Limit     Right Swing     4.2 seconds or less     4.6 seconds or less     5.2 seconds or less     Left Swing    
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