Hitachi – Bushes 

Measure the Bush with Ultrasonics or Callipers 

Bush – Ultrasonic Measurement  

1. Measure both sides of the bush with the ultrasonic tool. 

2. Test several points on both sides of the bush until you find the lowest reading. 

3. Use the lowest value to calculate the percentage worn. 

Bush Calliper Measurement 

1. Feel the bush with your hand to see if it has been turned. If it has been turned, a calliper cannot be used to measure the bush

2. The bush is worn on both sides from forward and reverse motion 

3. Ensure the callipers are at 90o to the bush. 

4. Measure the forward wear surface, and then the reverse wear surface. Check the measurement with a tape measure.  

5. Use the lowest value to calculate the percentage worn.