550 Generator is Working

super99

Well-known Member
Thanks to John T and every one else. I decided to check out the generator that I took off of the tractor first. Nothing happened when I hooked it to the battery, so I took it apart and cleaned it up. The armature was rusty,so I took it to the wire wheel and cleaned
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it up. The fields were just as bad, I used a wire wheel on the drill and shined them up and then finished with
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a wire brush . I checked the armature with a small screw driver and there was no magnetic pull on it so I think it is bad. Took the ends
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s of the case to the wire wheel and shined them up. Decided this one wasn?t going to work. After lunch I went over to where the tractor is and checked that generator, it spun when I hooked up the jumper cables, so that one is ok
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. Tried to polarize it but didn?t have any luck. Decided the rusty connections needed to be shined up. Promptly dropped the first screw into the sticks, leaves and mud. Drove 12 miles home to get a magnet and the other regulator so I would have plenty of extra screws. Cleaned up the connections and got it polarized and working like it should. Thanks again, Chris
 
You need to have the armature on a growler and turn it while dragging a hacksaw blade on it.
 
OK, I graduated High School in 1970, worked that summer at the local JD dealer. I was hired to help assemble machinery and ended up helping the head mechanic in the shop. I watched/helped him repair a generator. I remember him holding a hacksaw blade against the armature, didn't remember him having it on a growler. Also remember him putting the armature in a jig of some sort and truing the commutator and then it had something that he ran up and down in the grooves in the commutator. Memory isn't that good I guess. Chris
 
When trying to polarize the generator, I tried just touching the wires on the terminals several times with no luck. I ended up putting the extra ground under the field terminal and under a bolt on the generator and tightening, the when I touched the jump wire it finally sparked and started charging. To make it more fun, it was 39? and drizzeling. Chris
 
Yep she cant polarize unless current passes through the field coils TO GROUND. BOTH the VR as well as Genny need good grounds to operate correctly. Its also to polarize by jumping hot battery voltage direct to the Gennys ARM post and often one just jumps from BAT over to GEN/ARM on the VR.

John T
 

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