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Im putting a new motor on my coleman generator it is a powerbase series 2250 watts and cant get my armature off the shaft. There are no bolts holding it on and most of it is plastic so i cant beat on it. Do you have any ideas? coleman powermate generator. powerbase series M#pm0542200 S#68260508.

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Get a heat gun and change the molecular particals in the metal, making it expand...

Posted on Sep 21, 2009


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My son blew up his coleman generator - 5.5hp honda - can't get the armature off the engine shaft - any special tools needed so i can proceed with tearing down the motor

No special tool needed (usually). The armature is resting on a tapered part of the shaft. Assuming that you have removed the stator and have exposed the armature and have removed the center bolt. Apply penetrating oil to shaft so that the oil can enter between shaft and armature (wait for oil to work at least half hour). Hold piece of hardwood against metal part of armature (first one side then other) and rap very firmly with heavy hammer. Be careful not to hit metal directly or wiring. If the oil has done its work, the armature will come off with first couple of hits. If not add more oil and wait. Then try again. Good luck.

Oct 12, 2011 | Coleman Powermate Premium Plus 6250W...

1 Answer

How do i remove the engine from the armatuer

You have to remove the 4 bolts that holds the generator unit together. Some generators have a center cap which you have to remove to expose the long bolt that holds the armature on to the engine. Then remove where the end of the generator mounts to the frame it is sitting on. Loosen up the engine mounts and prop the generator end up slightly by putting a block of wood between where the engine and generator end housing come together. You have to unloosen the center bolt which holds the armature on to the engine. Do not take it out yet just loosen it and whith a block of wood against it hit the wood with a hammer to loosen the armature from the engine because it is on a tappered shaft. Make sure after you hit the wood on the bolt that the bolt is still loose or you have to loosen it a little more. After the armature loosens up you should loosen the bolt and remove it. You should be able to pull the rotar and stator away from the engine and with a punch tap where the armature goes in to the bearing and push it out.

Mar 14, 2011 | Hobart Champ 4500 Welder/Generator Outfit...

1 Answer

I just seperated the tapered crankshaft from the rotor of my coleman generator ( coleman powermate 2250 with a 5hp briggs and stratton engine). I applied PB blaster, and hit the end bell with a dead blow...

No there is not a key of any sort between the rotor and crankshaft, to verify you will not find a keyway to put one into on the shaft. Just the end bolt with washer holds it on.

Jan 19, 2011 | Coleman Powermate Premium Plus 6250W...

1 Answer

Im replacing engine on a model pm0525202 generator. i cant get armurature off shaft

Assuming that you have removed the stator and the center bolt, (1) apply penetrating oil to space between engine shaft and armature and wait for a few minutes. (2) Then apply carb cleaner to same area and wait for a few minutes. Find a very hard piece of wood like ash or oak and place on metal part of armature and strike firmly with hammer first on one side then the other. If it does not come loose on first attempt start over from step one. The engine has tapered shaft that really holds on to armature. Huge heavy hammer will not help. What works is the vibration of the hammer blow. That is why you need hard wood. Good luck and be patient, let oil do its magic.

Nov 14, 2010 | Coleman Powermate Powermate 5000W...

3 Answers

Remove motor from generator

aramature must be removed to get to the mounting plate it will slide out off case loosen long bolt in center of armature hold armature and hit bolt briskley will pop off be careful putting arm back may be 2 brushes inside have a helper hold brushes back

Jul 30, 2010 | Briggs & Stratton Briggs and Stratton...

1 Answer


Most of these require one to insert a bolt in the end of the shaft and use a slide hammer to decouple the rotor from the engine. There is a keyway typically... possibly a Woodruff key.

Apr 15, 2010 | Coleman Powermate Premium Plus 6250W...

2 Answers

Pull armature on generator from engine

Put the armature thru bolt in and back off about two turns. Smack the thru bolt hard with a hammer and the armature will release from the tapered crankshaft. You may damage the thru bolt. If so either get a new one or use a piece of all thread and a nut.

Apr 10, 2010 | Coleman Powermate Premium Plus 6250W...

1 Answer

How is the armature attached to the crankshaft on a Coleman Powermate 54 series?

the rotor has one bolt that goes through the rotor shaft into the crankshaft. the rotor is tapered to fit the crankshaft. remove the bolt and use a brass drift pin on the rotor shaft and give it a hard rap with a hammer. the rotor should come right off the crankshaft.

Oct 24, 2009 | Coleman Electrical Supplies

1 Answer

Engine runs but no power aat outlet????

Start with brushes and rings. Make sure your rings are clean and the your brushes have a good length. Flash the fields with 12V battery. Apply positive to the brush nearest the bearing and negative to the back brush, while genset is running. Use rubber gloves when doing this and keep hands away from rotating parts. You should see the voltage climb when you flash the fields. This would mean that you need a voltage regulator. If voltage does not climb, then you will need a new genset.

May 15, 2009 | Coleman Electrical Supplies

1 Answer

Remove generator from engine

Pull the end off the generator and you will have to buy or borrow an armature puller to remove the armature. It threads into the end of the shaft and pushes it off. I've seen many people destroy their generator by prying with screwdrivers. The engine has a tapered shaft and is sort of useless for any other application other than a generator.

Feb 04, 2009 | Coleman Powermate Proforce 2500 Generator

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