Indramat MDD/MHD Encoder Removal

There are several types of encoders used on the Indramat MDD/MHD series motors. The procedure below describes the older Hiedenhain and Stegmann types with larger diameter encoders. But even on the more modern and smaller Indramat encoders, the removal procedure is very much the same. It consists of removing the encoder center bolt, dropping in a small spacer, then using a slightly larger "jack bolt" that threads into the encoder shaft and pushes the encoder off of the motor's tapered shaft.   

1. Remove the 4 encoder housing bolts and the 5mm encoder shaft retaining bolt.           
   

2. Insert a 35mm x 3.5mm nail spacer into the empty encoder shaft. Then thread in the slightly larger 6mm jack bolt.
   
   
   

3. Lock the motor shaft and tighten down the jack bolt.
   
   
   
4. The encoder should come off the taper with minimal torque.