330C Excavator Hydraulic System Caterpillar

Measuring the amount of drift of the machine on a slope will determine if there is a need to check the travel 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
	Stopwatch	1
	Scale 150 mm (6 inch)	1

Illustration 1	g00297342

1. Place the machine on a slope of 12 degrees. The surface of the slope must be hard and smooth.

2. Position the implements, as shown. Refer to Illustration 1.

3. The bucket should be empty.

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Illustration 2	g00297498

4. To indicate the machine's relative position to the slope, put a mark on both the track and the track roller frame. Refer to Illustration 2.

5. Stop the engine.

6. Measure the machine movement on the slope after three minutes.

Table 2

Drift mm (inch)
New	Rebuild
0	0