303C CR and 303.5C CR Mini Hydraulic Excavators 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
Tape Measure	1
Stopwatch	1

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Illustration 1	g00816299
(A) Preliminary run 10 m (32.8 ft) (B) Travel distance 20 m (65.6 ft)

1. Travel distance must be at least 20 m (65.6 ft) long. Travel test ground must be hard and as level as possible.

2. Draw a 20 m (65.6 ft) straight line on travel test ground as a reference line.

3. Start the engine.

4. Place the engine speed dial in the HIGH IDLE position.

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 on the HIGH position.

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

10. The first 10 m (32.8 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 Speed and Drift for 303C CR
Travel Mode (Forward and Reverse)		Time to travel 20 m (65.6 ft) in seconds	Maximum Drift
Rubber Tracks	High	15.9 - 18.5	1000 mm (39.4 inch)
	Low	24.5 - 28.0	1000 mm (39.4 inch)
Steel Tracks	High	16.1 - 18.7	1000 mm (39.4 inch)
	Low	25.8 - 29.1	1000 mm (39.4 inch)

Table 3

Travel Speed and Drift for 303.5C CR
Travel Mode (Forward and Reverse)		Time to travel 20 m (65.6 ft) in seconds	Maximum Drift
Rubber Tracks	High	14.0 - 16.0	1000 mm (39.4 inch)
	Low	23.4 - 25.4	1000 mm (39.4 inch)
Steel Tracks	High	14.6 - 16.6	1000 mm (39.4 inch)
	Low	25.4 - 27.4	1000 mm (39.4 inch)

Note: The maximum drift represents the travel deviation (distance) from the reference line.