330C Excavator Hydraulic System Caterpillar

Note: When the procedure for the Travel On Level Ground cannot be performed, this test may be used as a substitute.

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

Illustration 1	g00297292

1. Start the engine.

2. Position the machine on level ground.

3. Increase the hydraulic oil temperature to 55° ± 5°C (131° ± 9°F).

4. Raise a track off the ground. Refer to Illustration 1.

5. Put a mark on a shoe of the raised track.

6. Place the machine controls at the following settings: Engine speed dial "10" and AEC switch OFF.

7. Place the travel speed control switch in HIGH position.

8. Move the travel lever of the raised track to full travel position.

9. Measure the time that is required for the raised track to make three complete revolutions. Measure the time that is required in each direction.

10. Place the travel speed control switch in the LOW position and repeat Steps 8 through 9.

Table 2

325C Time For Three Revolutions (time in seconds)
Travel Speed		New	Rebuild	Service Limit
HIGH	Forward	19.0 or less	20.0 or less	22 or less
	Reverse
LOW	Forward	32.0 or less	33.0 or less	35.0 or less
	Reverse

Table 3

325C L Time For Three Revolutions (time in seconds)
Travel Speed		New	Rebuild	Service Limit
HIGH	Forward	20.5 or less	21.5 or less	23.5 or less
	Reverse
LOW	Forward	35.0 or less	36.0 or less	38.0 or less
	Reverse