Dissassembly of a RV Electric Stabilizer Jack electric motor 

I had some flood water get into mine. Randomly stopped working one day. Pulled it apart and read this comment. My spring was completely gone on one side. Put a pen spring in there and not it works perfectly. Also cleaned up the rust and mud from inside also and resealed with silicone rtv

Enter motor brushes into ebay will yields a long list. Put in the dimensions you think they are may help. I would probably leave out the length. There are a couple of motor shops left in the world. While many do industrial motors I find the ones that service the publick are very helpful in trying to solve your issue. Let me know how you make out.

Sorry to here that. I found it interesting that the manual for this lift says "Disconnect one of the wire leads from the motor to prevent backfeeding the motor." Unfortunately this Jayco does not provide a disconnect that does not require wire cutters to use. It is certainly a problem when your jacks are stuck in the down position.

First I would be interested if the voltage stays at full voltage as it starts to slow. Very careful collecting that data as being near that moving scissor can do you damage. If the voltage is dropping by more than 1 to 2 volts the motor may not be the issue. Could be a dirty connection there or up stream. The other non motor thing to check is the scissor. It may be binding. Try the manual override with the motor. If you feel it bind you may want to try it again without the motor to tell you which side to concentrate on. The brushes and commutator would be my next suspect (assuming the motor spindle is not binding). Commutator being dirty or the brushes hanging, being worn down or damaged. There is the possibility of a coil issue. Look for discoloration in the form of dark blue or black. That would not be fixable. Good luck.

@@alwaystinkering6972 Hi and thanks so much for getting back. I took apart the motor. The brushes and springs look good, nothing really stands out, very little buildup, rust, or corrosion.....that all looks good. We've gotten a TON of rain here in N.E. Fla. the last two months, one option might be electrical connection corrosion somewhere up stream as you indicated. You mentioned manual override. Does that mean connecting the battery directly to the motor? If so, and it then works, that would seem to eliminate a lot of things.

@@jimmyparrish3885 hidden in the manual is usually reference to activating the jack manually. The connection is frequently on the opposite side of from the motor. Maybe you have seen a piece of metal resembling a car jack handle that came with the trailer. In any case it’s design is similar to that of a scissor car jack. It will be on the end of the threaded rod in the jack opposite the motor side.

@@alwaystinkering6972 Good info, will see if I can locate it. Thank you!

First, remember to watch the fingers with the moving parts as they won't stop if you are in the wrong place. On the one hand you could think gearbox, but I would hope the motor straining to its max would pop a breaker before damaging the motor. The gear box should not be too hard to inspect if you have to. First make sure it turns with the motor shaft removed. If you open it up, you would be looking for rubbing on a body part, or something in the gears. Gummed up or binding motor shaft sleeves (I don't recall it having bearings). Reduced power on the motor would be the other option. Brushes not making full contact, damaged wire limiting power flow or the option you don't want but could have, a damaged coil. Again, not tripping a breaker... a shorted coil would likely heat itself to open circuit, or draw so much it trips the breaker. Those are my guesses.

@@alwaystinkering6972 I will look at it again. Did not look at the coil/ springs etc. because the shaft turns when not under a load. I did look at the gears and they appear ok. When under a strain / load the shaft stops turning. Thanks

@@linwoodhobgood1401 Another thing to check... is the voltage dropping under load. You could have a bad connection before the motor and it is not passing enough current when the load kicks in. That could cause the voltage to drop and the motor to stall.

I would suspect the switch... unless you have multiple switches to raise and lower. In that case there could be a relay in hiding someplace. It’s a dc motor. Reversing the current flow reverses the direction the motor turns.

@@alwaystinkering6972 Thanks for your time I'm sorry the switch was the first thing I replaced. I'll keep checking.

@@larryraines6953 which cover did you put on in reverse that caused it to change direction?

@@alwaystinkering6972 The outer metal cover with the magnets that the long bolts in it.

@@larryraines6953 First video covers how the magnetic fields work. The second video is how to test the armature for a short. It shows several test to run. We are looking for why the electric current running in one direction is not generating the magnetic field. In the tests they show a short you could probably have a short that may still generate enough field creation to make it spin, but in the opposite direction it negates the field creation. If you are getting the full voltage one way and then the other... The Armature is likely the answer. This of course is assuming that visual inspection of the magnets in the housing show now cracks. Nice video on magnetism in the motor ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-CWulQ1ZSE3c.html How to test the armature ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-lmjFzukDhqI.html