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Old 08-10-2009, 06:32 PM
 
691 posts, read 1,475,794 times
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This is a Mi-T-M Gen-3000-0mH0 Generator, I picked up. The Honda 5.5 hp engine runs good, the gen is only putting our 3.6 volts ac. Pulled the back cover, and checked all 4 wires to ground and none are grounded. I did notice, there are .7 ohm from the bottom left whit wire to the top right black wire and the same right top to bottom left wire. No reading side to side or top to bottom (same sides) there are 2 black wires and 2 white wires going to the connector out the back of the gen. I was thinking it may be the brushes, but just found out, some gens don't have brushes. Thought I'd post here to see if anyone has run across this before.
Also:
I just removed the generator part and there are no brushes. has a little rust on commutator or what ever the winding that spins, is called.

Another thing that seems odd, is nothing is magnetic. Seems like the stationary windings should have magnets around them.

I try'd exciting the system, like I read on line, with a drill and again with a battery, but none of that worked.
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Old 08-10-2009, 07:05 PM
 
Location: Where there is too much snow!
6,076 posts, read 11,015,723 times
Reputation: 2924
Quote:
Originally Posted by msta999 View Post
This is a Mi-T-M Gen-3000-0mH0 Generator, I picked up. The Honda 5.5 hp engine runs good, the gen is only putting our 3.6 volts ac. Pulled the back cover, and checked all 4 wires to ground and none are grounded. I did notice, there are .7 ohm from the bottom left whit wire to the top right black wire and the same right top to bottom left wire. No reading side to side or top to bottom (same sides) there are 2 black wires and 2 white wires going to the connector out the back of the gen. I was thinking it may be the brushes, but just found out, some gens don't have brushes. Thought I'd post here to see if anyone has run across this before.
Also:
I just removed the generator part and there are no brushes. has a little rust on commutator or what ever the winding that spins, is called.

Another thing that seems odd, is nothing is magnetic. Seems like the stationary windings should have magnets around them.

I try'd exciting the system, like I read on line, with a drill and again with a battery, but none of that worked.
Go the Oklahoma thread and contact "mkfarnam" I hear he's real good with those things. Tell him "EarthBound?" sent ya, he'll help you out.
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Old 08-10-2009, 07:59 PM
 
Location: Oklahoma(formerly SoCalif) Originally Mich,
13,387 posts, read 16,738,045 times
Reputation: 4611
Quote:
Originally Posted by msta999 View Post
This is a Mi-T-M Gen-3000-0mH0 Generator, I picked up. The Honda 5.5 hp engine runs good, the gen is only putting our 3.6 volts ac. Pulled the back cover, and checked all 4 wires to ground and none are grounded. I did notice, there are .7 ohm from the bottom left whit wire to the top right black wire and the same right top to bottom left wire. No reading side to side or top to bottom (same sides) there are 2 black wires and 2 white wires going to the connector out the back of the gen. I was thinking it may be the brushes, but just found out, some gens don't have brushes. Thought I'd post here to see if anyone has run across this before.
Also:
I just removed the generator part and there are no brushes. has a little rust on commutator or what ever the winding that spins, is called.

Another thing that seems odd, is nothing is magnetic. Seems like the stationary windings should have magnets around them.

I try'd exciting the system, like I read on line, with a drill and again with a battery, but none of that worked.
Are you saying that the generator puts out but only a low discharge?
Or what was the main reason for tearing down the generator in the first place?
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Old 08-10-2009, 08:22 PM
 
691 posts, read 1,475,794 times
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Yes, the gen is only putting out between 2 and 3 volts at mid throttle. If I set it at max throttle, it will go to a little over 3 volts. I bought the gen like this, thinking I'd just have to change out the brushes, but, like I said, this gen doesn't have brushes and the parts manual says the gen part is an alternator (part n. Alternator, 32-0823).
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Old 08-10-2009, 09:00 PM
 
691 posts, read 1,475,794 times
Reputation: 284
Default Maybe this will help.





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Old 08-10-2009, 09:09 PM
 
Location: Oklahoma(formerly SoCalif) Originally Mich,
13,387 posts, read 16,738,045 times
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What made you think the problem was internal?
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Old 08-10-2009, 09:21 PM
 
691 posts, read 1,475,794 times
Reputation: 284
The low voltage, made me think the problem is internal, since there just isn't too much to the system, externally. Kind of like an alternator with low and erratic charging.
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Old 08-10-2009, 09:36 PM
 
Location: Oklahoma(formerly SoCalif) Originally Mich,
13,387 posts, read 16,738,045 times
Reputation: 4611
A low magnetic flux can cause the problem your describing. If it was a problem in the wiring system, you would have 0 voltage, whether the throttle was high , low, or med, ( the engine should be set at a fixed speed) by the manuf,

You said that nothing was magnetic, the only thing that should be magnetic is the magnets, which are located inside the casing. If anything else was magntized you would have an open circuit 0n the armature or/and a ground problem.
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Old 08-10-2009, 09:52 PM
 
Location: Oklahoma(formerly SoCalif) Originally Mich,
13,387 posts, read 16,738,045 times
Reputation: 4611
Check the exciter bearing (end armuture bearing) for wear. A worn bearing causes end play at the armature and in turn can cause a low magnetic flux and will result in serious damage to the alt/gen.
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Old 08-10-2009, 09:53 PM
 
691 posts, read 1,475,794 times
Reputation: 284
When I had the gen apart, I put a small wrench inside and there didn't seem to be an magnetism, like in a starter or electric motor.....shouldn't there be? Can you give some recomendations on what to check next?
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