How do you remove the armature from the crank on a generator?

Question

I am planning the replace a con-rod in a gas generator. The armature for the generator appears to be pressed onto the crank. How can I remove it without damaging it? (Tecumseh 8HP motor)

Answer 1

first take out the bolt and soak the crank with LIQUID WRENCH for a day then put a long rod or bolt smaller than the original crankshaft bolt down the crankshaft bolt hole and vibrate it with an air hammer while firmly but not too firmly prying on the generator and the crankcase it should pop right off it is a tapered shaft if you don't have an air hammer you can get one for $15.00 at home depot. Make sure your bolt or rod is long enough and smaller than the original bolt!!! and use liquid wrench not WD40. While your in there replace your rings and all the gaskets Just a word of advice. Good luck Don't use a pickle fork you will crack the crankcase!!!

Answer 2

You cannot just slide the engine crankshaft off of the armature shaft. It is a taper fit and the friction in the taper is what holds the armature shaft ONTO the crankshaft. Ideally, the engineers could have designed it where it was bolted on to the end of the PTO side of the crankshaft, but that would have made servicing the engine too easy. The one I have has internal threads INSIDE the rotor before the end of the rotor shaft. Making a homemade puller and utilizing it INSIDE the armature shaft has only made matters worse as the puller bolt used was slightly too large and is now stuck in the ID threads of the rotor. Rotor bolt is 6 3/4". Total armature length (including the fan) on this Briggs 10 HP Coleman generator is 9 3/4". Be very careful if using a homemade puller that your push bolt makes it ALL the way to the crankshaft.

Answer 3

The shaft is tapered. You need a special tool, like a pickle fork to seperate the rotor from the crankshaft.

Answer 4

You should buy the whole part or take it to a electric motor repair shop