Idler Rim 

Idler – Depth Gauge

1. Use a Depth Guage placed across the ridge in the middle of the Idler as shown above.  

2. Extend the pins until the reach the lowest points on the wear surface where link rail runs on the Idler surface.  

3. Then use a tape measure the measure the length of the pins. 

Idler – Diameter – Tape Measure 

1. Use a tape measure to measure the diameter of the Idler.  

2. This might be difficult in cases where the Idler is in the machine, and hence the Depth Gauge measurement might be easier.