308D CR Mini Hydraulic Excavator Hydraulic System Caterpillar

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

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Illustration 1	g00296317
(A) Preliminary run 5 m (16.4 ft) (B) Travel distance 20 m (65.6 ft) (C) Bucket height 0.5 to 1 m (1.6 to 3.3 ft)

1. Travel distance must be at least 25 m (82 ft) long. Travel test ground must be hard and as level as possible.

2. Draw a 25 m (82 ft) straight line on travel test ground as a reference line.

3. Start the engine.

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

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

6. The bucket should be empty.

7. Position the machine so that one track is parallel with the reference line. Position the machine for the travel test. Refer to Illustration 1.

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

9. Move the machine by operating both travel levers at the same time.

10. The first 5 m (16.4 ft) are for a preliminary run. Measure the travel time that is required to travel the remaining 20 m (65.6 ft). Measure the time that is required in each direction.

11. Measure the travel deviation from the reference line.

12. Place the travel speed control switch on the LOW position and repeat Steps 9 through 11.

Table 2

Travel Time (time in seconds)
Travel Speed		New	Rebuild	Service Limit
HIGH	Forward	15.3 or less	17.6 or less	19.9 or less
	Reverse
LOW	Forward	25.3 or less	29.1 or less	32.9 or less
	Reverse

Note: The following table represents the travel deviation (distance) from the reference line.

Table 3

Travel Deviation mm (inch)
Travel Speed		New	Rebuild	Service Limit
HIGH	Forward	1150 (45.3) or less	1550 (61.0) or less	1850 (72.8) or less
	Reverse
LOW	Forward	1150 (45.3) or less	1550 (61.0) or less	1850 (72.8) or less
	Reverse