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1948 RC 77 starting problems

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Jeff Oliver

11-13-1999 15:10:44




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I have a RC77 on 6 volt system. We recently got it painted and it run great before. When we got it back I gotit put back together and started it. After a few tries it fired up and run pretty good. When I backed it out of the carport and started to go forward it died. Since then the starter will not turn it. I have not pull started it yet but that will be next.

the motor is not locked up as I cna turn it over by hand and see the flywheel turn also. The problem I am having is that the starter is not working when it is in the tractor. I can take it out and bolt it so the gear is outside and it iwll turn over. The battery alone will not do it but I have a charger wit ha 6 volt boost taht will. It will even turn when I put t he charger on charge instead of boost.

WHen I put the starter in the tractor and use the booster on it all it will do is humm like a dead battery. I have changed switched and checked the lines with a voltmeter. It is getting current to the starter but that is all.

Any ideas or suggestions are geatly appreciated!! My dad ( john Deere man) told me to get a "real green one" I just can'nt let this kind of comment go by.:)))

thanks !!!!

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Bob K.

11-14-1999 18:37:11




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 Re: 1948 RC 77 starting problems in reply to Jeff Oliver, 11-13-1999 15:10:44  
Assuming that you have proper ground (no paint and the like), I offer the following...I'm not familiar with the model you have, but I do
have an Oliver crawler that acted that way. Turned out to be the starter button..If your tractor does NOT have a solenoid, then the full current required to start goes thru your starter button. Over time, with many cycles of arching on-off, the contacts get burnt to the point that they will no longer cunduct enough amperage to operate the starter under load. A starter on a bench requires very little amperage to turn, so a charger can spin it. Put the starter back in, and push the start button. While it is "humming like a dead battery", as you say, clamp a jumper cable on the battery (NEG if your POS ground) and touch it to the post on your starter. If it sparks a bit and kicks right in, your push button is bad. This also happened to my 35 Ford the first time I drove it to church. Those switches can be pried apart and filed bright again, but thats iffy.

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Jeff Oliver

11-13-1999 19:30:53




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 Re: 1948 RC 77 starting problems in reply to Jeff Oliver, 11-13-1999 15:10:44  
Just wanted to let yo uknow we got it figured out. My dad took the starter apart tonight and the conncetors taht go to the screw on top had come loose. Also it had a light coat of grease or oil in the armature. We are goign to clean it up and resolder the connection tomorrow and see how that does. Mn I sure hope that is all there is to it as I am really wanting ot hear her fire up !!!!



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Dennis Hawkins

11-14-1999 16:26:40




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 Re: Re: 1948 RC 77 starting problems in reply to Jeff Oliver, 11-13-1999 19:30:53  
I am not sure about the RC 77, but my Super 55 probably has a similar starting system. On the Super 55, I had the exact same thing happen. It would just buzz a little when I tried to crank it. The problem in my case was that the rubber grommet that the hot wire from the starter solenoid relay passes through as it enters the starter motor had decomposed and allowed water to seep in over time. The water caused a bunch of problems inside the starter. The solution was to rebuild the starter with a new set of brushes and permatex the hole so that more water could not enter.

You might wan't to take a look at the YTMAG article below on upgrading your tractor's electrical system from 6 to 12 volts, positive to negative, ground, generator to alternator, and points to electronic ignition. It is easier than you think.

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Jeff Oliver

11-15-1999 15:56:38




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 Re: Re: Re: 1948 RC 77 starting problems in reply to Dennis Hawkins, 11-14-1999 16:26:40  
Yep that is what happened. We put it back together yesterday and I was driving donw the road within a few minutes.

All we do wiht the tractor is show it so I am going to keep the 6 volt system right now. It works pretty good really. I never had a problem starting it last winter although I am in Tennessee so they are not really bad here.

Just got to get some more little stuff done and get the decals on and I should have it finished.

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highboyford

11-13-1999 17:42:20




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 Re: 1948 RC 77 starting problems in reply to Jeff Oliver, 11-13-1999 15:10:44  
My guess would be bad ground,could you have paint between the starter and engine backing plate?



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