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Removing Generator Field Coils

R

RICHMONDRON

Member
I have a '53 CUB with a generator field coil that is shorted to the casing (pulled gen., dissasembled, removed field terminal stud from insulator, and there is continuity between the field terminal stud and the gen. casing with the brush wire free and not contacting the case).

I've found replacement coils on the web for about $18.00 and, if my armature checks out, may want to replace what I have instead of getting a whole new (to me anyway) generator. I have no idea if there is a special tool I'll need to use or what I'm getting into, job wise, by trying to remove the old ones, so it may not be a great idea in reality.

Can anybody shed any light on it for me?
 
Take it to a generator repair shop. They should have a large c-shaped tool that is used to get the screws out & put them in tight again. Don't try it yourself as you will just booger them up unless you have the tool.
 
As I recall. the field coils simply fit around the pole shoes and then the shoes are held in place with the big countersunk phillips screws that go in from the outside of the case. There is a piece of insulation in there, I think between the shoes and the coil. The hard part is getting those big screws out.
 
Fought them screws for years, after I got a impact driver (type of tool you hit with a hammer) they come out easy. New screws use phillips head which work great with the driver.
 
(quoted from post at 14:00:31 12/07/09) Fought them screws for years, after I got a impact driver (type of tool you hit with a hammer) they come out easy. New screws use phillips head which work great with the driver.
Click to expand...

I have use both the jig for removing the pole screws and the impact driver. The impact driver works better and quicker. Clamp the generator housing in a vise to give some support to the side to avoid distorting the housing.
 
Mark the poleshoes and, once you get them out to install the new coils, put them back in the same position and orientation as before. Get them TIGHT.

NOT 100% necessary, but not a bad idea as they retain a small amount of residual magnetism.

After repairs, be SURE to polarize the generator BEFORE initial startup.
 
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