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Harry Ferguson Tractors Discussion Forum
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to20 starter

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bill burger

10-06-2005 18:02:31




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I need some help. I recently had the starter rebuilt on a to20, three times. I can get the starter to spin on a bench but I can not get it to turn the motor over. I have have sufficient current running from the key through the entire ignition system but nothing. I have tried going directly from the battery to the starter by passing the entire ignition system but the engine still no go. I can turn the engine by hand thus I do not believe it is frozen. Should there be some kind of a spacer between the starter and where it is mounted? The fly wheel seems to be fine but the @#$ engine will not turn. Any suggestions?

Thanks Frustrated Bill

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greg scott

10-10-2005 10:29:12




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 Re: to20 starter in reply to bill burger, 10-06-2005 18:02:31  
if it is the drive gear marcs one in phoenix rebuilt mine for $115. # is 602-340-9246



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Jerry/MT

10-10-2005 09:11:22




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 Re: to20 starter in reply to bill burger, 10-06-2005 18:02:31  
If I understand your question correctly, your starter is turning over but the engine isn't. Does you tractor have the starter switch that is normal activated by the gear shift lever disabled? If it does, be very careful to not start it in gear. Folks get run over that way and that's why the Ferguson's had the gear shift actuated starter safety switch. The other thing to look for on TO-20's is if you have an early model (or the flywheel was replaced with an old version) it is possible for the ring gear to come off the flywheel. A design change was made adding a lip to the rear edge of the flywheel to prevent this but you may have one of the original versions. People have tried to weld the ring gear to the flywheel but unless you know how to weld white cast iron, the results are unsatisfactory. The reason I know this is someone did this to my TO-30 and I had the same problem as you're having. Pull the starter and look carefully at the ring gear and you may be able to see that it is not on the flywheel. In my case the ring gear was wedged between the bell housinga nd the flywheel and I couldn't turn the engine over. In my case, I replace my flywheel with the newer design.The other possibility is that your starter drive is broken. I checked mine by VERY CAREFULLY jamming the drive gear with a screwdriver and quickly touching the battery lead with a jumper cable . If the drive is good, you feel it try to rotate the gear. If it's not, the starter will rotate but no torque will be applied to the gear. Do this very carefully!

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greg scott

10-07-2005 11:13:01




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 Re: to20 starter in reply to bill burger, 10-06-2005 18:02:31  
sounds like a problem i had. when the starter is on the bench use a piece of wood to push on the gear and it will stop but starter keeps spinning. the drive gear has sheared off or something. the only place i found can rebuild the drive gear. someone on hear told me about a place in arizona i think. something like mark one. i can"t remember for sure. i will bring the file to work on mon. and give you contact info.

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John T

10-06-2005 19:59:21




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 Re: to20 starter in reply to bill burger, 10-06-2005 18:02:31  
Bill, to spin freely on a bench takes tons less current then if shes trying to crank the engine. When you speak of jumping it, I guess youre using big heavy jumper cables right???? Cuz she sure wouldnt crank the engine using only light gauge wire and the wire could get hot n burn up.

To crank the engine you need like No. 4 at a minimum, but better 0 or even 00 gauge battery n starter n ground cables. If in doubt as to cable terminations and ends and connections, I would remove,,,,, ,,,clean n wire brush,,,,, ,, n reattach each n every battery n starter n ground cable, and its best to ground to a good heavy solid frame member versus any rusty tin seat or battery boxes etc etc.

If it has an electric starter solenoid that you can safely get access to, you can try by passing the solenoid and jumping direct to the starter or starter side of the solenoid, but use caution thats a high current possibly arcing connection.

Is it spinnign at all????? or does it sound like it engages the flywheel teeth but then cant crank the engine or does it do anything????

If it uses an electric solenoid, is it receiving activating voltage on its lil S terminal and can you hear the solenoid kicking in??? In case the start switch is bad and isnt sending voltahe to a solenoids lil S activation terminal, try jumping a hot wire to it n see if the solenoid pulls in?????

Sorry, I just need to know more to help you out.

John T, retired electrical engineer

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Crem

10-06-2005 19:27:27




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 Re: to20 starter in reply to bill burger, 10-06-2005 18:02:31  
Have you checked if your ground cable is ok? Sometimes the ground cable is attached to the dash, and with old rusty bolts along the way, the path to the engine block may suffer a voltage drop.



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danct

10-06-2005 18:47:34




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 Re: to20 starter in reply to bill burger, 10-06-2005 18:02:31  
bil
Look in the hole where the starter goes make sure the ring gear didnt come off the flywheel ,if you take the plugs out you can turn engine by moving fanbelt check condition of teeth ,let us know
Danny



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