m105s wont start at times

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m105s wont start at times

Larry	Have a m105s tractor will not do anything when you turn the key. eventually it will start. safety switches are fine, tried new key switch and relay switch to no luck. Dealership cannot figure it out. Any one there smarter than them??
Smokin Dog	I understand what your saying but a little more info would help. When it doesn't start, do you hold the key in the start postion, nothing happens, but while still holding the key it finally kicks in the starter. Or are you just turning the key on and off and it finally starts?
Smokin Dog	Forgot! Do you hear the starter clicking when you try to start it and it wont start? or is it like it's dead?
Larry	It is just dead. You keep turning the key off and on then it starts again. Sometimes will run 2-3 days starting it 20 times a day always starts, then you suddenly have to fiddle with it again for a few days. When service was out checking the one time, when it started the must have stopped and started it 30-40 times never missed a beat. works for couple days then back to the same old thing again.
Smokin Dog	I can't be sure of this, but it sounds like a problem we had in the shop on a few vehicles. what we found was the starter armiture had a dirty spot, when the starter finally stopped on that one spot the brushes wouldn't make good contact. After trying several times it would start. The repair we did, was remove the starter, take the end off with the brushes, use a very fine sand paper and polish the black build up off the commintator,(the brass bars where the brushes rub on the armiture) Then make sure the brushes are in good condition and free moving. reinstall and the problem was gone. We had one doing this that had to have another armiture, it had a small burned spot on the commintator. Hope this helps, Good luck.
Smokin Dog	Seems I forget things in my old age, while your in the starter, check out the contacts in the solenoid. They get a spark corrosion on the contacts and can cause the same problem. If the solenoid can be taken apart, you can clean it up with sand paper also.

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