Testing armature on a power tilt trim motor

[Tackman331]

Any one know the proper way to test the armature to see if it is good?

 

[99yam40]

Re: Testing armature on a power tilt trim motor

You never updated your other thread as to what you found so far with your testing.

Did you already pull the trim motor and take it apart? If so what have you found?

Most of the time the motor gets water in it and rusts or the magnets come loose and need to be replaced.

 

[Tackman331]

Re: Testing armature on a power tilt trim motor

Sorry 99........I found the relay to be working properly now it is to the motor that is why I started a new thread. I took it apart and there was no water or corrosion in it. I really do not know how to tell if the brushes are bad by looking at them. I have been trying to research on rebuilding it. I know the parts are available, I just need to test everything to see what needs replaced and what doesn't. I know the brushes will be replaced in the event of a rebuild. We have a local guy that rebuild dc motors but I am not to sure of him, he hasn't given me any straight answers yet. So if I can find the answers here it looks like I might do it myself, unless it is not cost effective.

 

[rodbolt]

Re: Testing armature on a power tilt trim motor

test a DC armeture just like any other DC motor,or generator, armeture.
continuity between opposing segments.
mica undercut and no continuity between any segments and the core.
a growler helps a lot but you dont see them much anymore.
most of those trim units have a thermal inturrpt device.
its a bimettalic strip with a set of contact points.
after water intrusion its the biggest cause of failure.

 

[99yam40]

Re: Testing armature on a power tilt trim motor

Did you try to run the motor by touching the motor leads to a good 12v battery?
I saw that you said you tried by touching to a battery charger, but I am not sure what kind of charger, so that might not work.
Did you have continuity when tested with ohm meter between motor leads?
If you did not have continuity(Open or OL) then the thermal or brushes would be the 1st thing to look at.

 

[Tackman331]

Re: Testing armature on a power tilt trim motor

I did try the motor by touching the leads to a battery and got nothing. So I am just going to rebuild it, after I figure out the testing procedures you posted.

 

[pine island fred]

Re: Testing armature on a power tilt trim motor

RODBOLT was refering to this procedure. With an ohm meter, check for continuity between each segment of the commutator. Should have continuity all around. Next with the meter, check that the commutator is not shorted to the shaft.
His reference to a growler, have not seen one in a very long time myself. Motor/ generator shop should have one. Looks like a laminated V shaped block. Armature is set in the V and a hack saw blade is held over it. If any of the windings are shorted to each other, the blade is pulled down like a divining rod pointing to water.
Lots of basic electrical stuff around that are never used or heard of. One comes to mind is a degouser. Used to demagnetize aircraft. Big copper coil you wave around like a pagan ritual. Remember finding a long running compass problem on a 727. Pulled a lot of hair out, got to the point I took the whiskey compass out of the cockpit and carried it all around the wings. By dumb luck I found a flap track that was not demagnetized after it was magnafluxed. Magnet was interfearing with the flux valve on the wing tip. Guess I got off the subject again. regards FRED

 

[rodbolt]

Re: Testing armature on a power tilt trim motor

we also degauss ships, its a pain and it sucks.
look carefully at the armeture, you will note an even number of segments,shiny copper bars, seperated by thin strips of mica.
the mica strips have to be undercut or they can make the brushes bounce.
test each segment for continuity with the segment 180* from it.
should have it.
then test the rest without moving one lead, should only have continuity on segments 180* apart
Hay Fred, hope your winter was warmer and better than ours.
glad to see your still kickin.

 

[Tackman331]

Re: Testing armature on a power tilt trim motor

RB there is a circut breaker in the motor, if you are familiar with it. How would I test that to see if it is working correctly?

 

[rodbolt]

Re: Testing armature on a power tilt trim motor

if it has the thermal switch its typically mounted on the brush holder plate.
it will look like a set of points.
you test it for continuity, the ability to allow trons to pass.

 

[Tackman331]

Re: Testing armature on a power tilt trim motor

The circuit breaker is bad and I had the armature tested on the growler and it had a short in it. Unless I can find these parts reasonable it looks like a new motor is due.

 

[99yam40]

Re: Testing armature on a power tilt trim motor

I would think that when a thermal goes out there is usually a reason that it went out.
Yea, probably easier to buy new motor unless you know someone at a shop that might have some old parts and pieces laying around. Finding the right one maybe a challenge to find the right parts only for your motor.
They do make aftermarket motors also, so you do have a choice other than Yamaha.

 

[Tackman331]

Re: Testing armature on a power tilt trim motor

99 Do you know of any others out there? I have searched and the only thing I come up with is from yamaha at $400 and change.....there is another place that has one at $350. All the after market ones I checked are a no go arco mallory

 

[mutch]

Re: Testing armature on a power tilt trim motor

Why not try a outboard wreckers and get a second hand one ?
surely at a reasonable price

 

[99yam40]

Re: Testing armature on a power tilt trim motor

99 Do you know of any others out there? I have searched and the only thing I come up with is from yamaha at $400 and change.....there is another place that has one at $350. All the after market ones I checked are a no go arco mallory

What do you mean are a no go? they do not have one for your motor?

 

[Tackman331]

Re: Testing armature on a power tilt trim motor

that is correct the only place I have found it was yamaha and boat.net I have called at least 10 different electric motor places that sell t t motors and the one I have they don't carry. This is different than most I have seen. The one I have has a shaft coming out maybe 2 inches or so all the ones I have seen have a really short shaft.

 

[Tackman331]

Re: Testing armature on a power tilt trim motor

Here is a picture

 

[Tackman331]

Re: Testing armature on a power tilt trim motor

here it is

 

[Tackman331]

Re: Testing armature on a power tilt trim motor

Problem solved new one on the way.

 

[99yam40]

Re: Testing armature on a power tilt trim motor

What did you find and where?