|The fixed burr after removal|
|The grind chamber without it's burr|
|The grind chamber and fixed burr after clean-up|
The grind chamber is also the end bell for one side of the motor. Once the grind chamber was removed from the motor, I was able to remove the rotor assembly and the other end bell containing the start circuit.
|Centrifugal Start Switch. Note flyweights and actuator disc on rotor shaft.|
While I had things apart, I replaced the motor bearings and cleaned things up a bit. The original bearings were New-Departure C8503 and C88503. Both have an extended inner race, so make sure you measure the critical dimensions carefully before ordering replacements. I bought my replacements from Accurate Bearing. They are always super helpful with obtaining the obsolete types and had these in stock. Below are some pics of the rotor before bearing replacement. Note the grooved piece to the right of the bearing. The parts diagram list this piece as a seal. I have never seen anything like it before. There were no remnants of rubber or oakum in the grooves, so I'm not sure how this works. I think one reason for this design is to provide a surface for the adjustable burr tension spring to ride upon, as it rotates with the shaft and adjustable burr. After cleaning everything up I placed the seal back on the shaft with a little Locktite bearing retainer and reassembled.
|Rotor as removed with fan, bearing, and seal|
Each motor subassembly was cleaned up and repainted before final assembly. I've included a few pics of the completed assembly.
As a routine part of any restoration of old equipment with a capacitor start motor, I always replace the start capacitor. The original capacitor was mounted using a large strap clamp attached to the lamp bracket. The entire assembly bolts to a standoff bracket inside the case. The new capacitor is much smaller and mounts with a different style mount, so I fabricated a new bracket from some scrap I had in the shop.
|Original lamp bracket with strap clamp|
|New lamp bracket with replacement capacitor mounted|