305 CR Mini Hydraulic Excavator Hydraulic System Travel on Level Ground - Test Caterpillar


Travel on Level Ground - Test
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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 1g00816299

    (A) Preliminary run 5 m (16.4 ft)

    (B) Travel distance 20 m (65.6 ft)

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

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

  1. Start the engine.

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

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

  1. The bucket should be empty.

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

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

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

  1. 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.

  1. Measure the travel deviation from the reference line.

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

Table 2
Travel Time (time in seconds)
(S/N: BMW, DSA)    
Travel Speed     New     Rebuild     Service Limit    
HIGH     Forward     15.0 to 18.0     19.0 or less     21.5 or less    
Reverse
LOW     Forward     25.5 to 27.5     31.0 or less     35.0 or less    
Reverse

Table 3
Travel Time (time in seconds)
(S/N: DGT)    
Travel Speed     New     Rebuild     Service Limit    
HIGH     Forward     14.6 to 17.6     19.0 or less     21.5 or less    
Reverse
LOW     Forward     25.0 to 27.0     31.0 or less     35.0 or less    
Reverse

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

Table 4
Travel Deviation
mm (inch)    
Travel Speed     New     Rebuild     Service Limit    
HIGH     Forward    
1200 (47) or less    

1500 (59) or less    

2000 (79) or less    
Reverse
LOW     Forward    
1200 (47) or less    

1500 (59) or less    

2000 (79) or less    
Reverse

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