330C Excavator Hydraulic System Caterpillar

Measuring the swing speed on a slope will determine if there is a need to check the swing motor and the anti-reaction valve. 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" 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	g00298078

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

   1. The work tool should be empty.

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

   3. Position the implements at maximum reach and close the work tool. Position the work tool above the ground so that the work tool will not come in contact with any obstacles.
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   Illustration 2	g00298079

   4. 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.

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

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

   7. Measure the time that is required to swing the upper structure from position (C) to position (B).
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      Table 2

      Swing Time (seconds)
      Item	New	Rebuild	Service Limit
      Right Swing	5.2 or less	5.7 or less	6.5 or less
      Left Swing

2. Complete the following steps in order to measure the swing drift on a slope.
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   Illustration 3	g00298079

   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.
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   Illustration 4	g00293972
   (A) Upper frame (B) Undercarriage frame (C) Marking

   2. 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.

   3. Stop the engine.

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

   5. Start the engine.

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

   7. Repeat Steps 2.b through 2.d.

Table 3

Swing Drift mm (inch)
Item	New	Rebuild	Service Limit
Right Swing	0	0	0
Left Swing