308C CR Excavator Hydraulic System – Travel on Level Ground – Test – Optional Test

Note: When the procedure for the Travel Test 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.
  1. Position the machine on level ground.
  1. Raise a track off the ground. Refer to Illustration 1.
  1. Put a mark on a shoe of the raised track.
  1. Place the machine controls at the following settings: Engine speed dial “10” and Low idle switch OFF.
  1. Place the travel speed control switch in HIGH position.
  1. Place the hydraulic activation control lever in the UNLOCKED position.
  1. Increase the hydraulic oil temperature to 55° ± 5°C (131° ± 9°F).
  1. Move the travel lever of the raised track to full travel position.
  1. Measure the time that is required for the raised track to make three complete revolutions. Measure the time that is required in each direction.
  1. Place the travel speed control switch in the LOW position and repeat Steps 9 through 10.
Table 2
Time For Three Revolutions (time in seconds)    
Travel Speed     New     Rebuild     Service Limit    
HIGH     Forward     13.5 or less     15.5 or less     17.6 or less    
Reverse
LOW     Forward     20.4 or less     23.5 or less     26.5 or less    
Reverse