There are two major problems I find when I disassemble one of these motors.
1--The 50 year old grease--laid in in great gobs at some point--is hard as a rock.
2--The main permanent magnet, that surrounds the armature, distorts with age and heat, and seizes the armature so it cannot turn. I dig out all the old, nasty, neolithic grease, correct the magnet's shape, clean and adjust the self park switch assembly
adjust the shaft and armature end plays, and put in modern non-hardening, temperature stable grease, then reassemble and test the sucker. This photo shows the reconditioned motor on the test bed.
Here are six reconditioned SWF one speed motors. The four on the left are six volt motors, the two on the right are twelve volt. All ready to go. I also have a number of reconditioned SWF two speed twelve volt motors. And you know what? They look just like six shown here. Good luck trying to figure out what yours is--HA!
City Car Design
5 years ago