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Harry Ferguson Tractors Discussion Forum
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TO30 Starter 6V 12V Hand Crank

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FarmerArt19330

10-01-2004 17:06:41




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My 1952 TO30 burns out the starter. It is a 6V starter on a TO30 that has a 12V conversion with a push button add on. I have replaced the starter with numerous rebuilts, and starters I have rebuilt from the cores I own.

Many places offer quality 6V rebuilds, but they never last on my 12V system. The starters I have are 9 tooth clockwise units. MFG#1109457.

I have seen 12V starters for a TO30, but they were noted for 1961-1967 models. MFG#1107226. Would these fit my 1952 model? Is there a 12V starter available from any manufacturer that fits my 1952 TO30?

How about a replacement hand crank as a last resort?

Art
Seaton, MO

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Jerry/MT

10-01-2004 19:45:23




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 Re: TO30 Starter 6V 12V Hand Crank in reply to FarmerArt19330, 10-01-2004 17:06:41  
I have a 12V conversion with an original 6V starter on my TO-30 and have no problems. The use of 12V actually makes life easy for the 6V starter because at 12V, the starting current is halved relative to the 6V current, thus reducing the internal heat generated in the windings. I would suggest you check the resistance in the starter circuit from the battery through the starter switch to the starter;it should be a few ohms (less than 10 ohms). If it's not, you need to find out why. By the way, TO-30's were last made in 1954 and not into the '60's.

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Jim W

10-02-2004 05:09:06




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 Re: TO30 Starter 6V 12V Hand Crank in reply to Jerry/MT, 10-01-2004 19:45:23  
Jerry/MT,
I have heard this a few times now and being an electrical guy I can't stop myself from commenting this time:
The current is halved alright but at the same time the voltage is doubled, so the watts consumed are the same. All else being equal, the starter should get exactly as hot with 12 volts as with 6.
But I guess it spins faster, and the tractor starts a bit sooner, so the starter doesn't have to work as long, which would reduce the heat.
Jim

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Brian of Arkansas

10-04-2004 07:02:10




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 Re: TO30 Starter 6V 12V Hand Crank in reply to Jim W, 10-02-2004 05:09:06  
If you dont mind a beginners input on the subject.

Is there any possibility the cause of the problem is the rebuilding you are doing. Maybe missing some minor tolerance in acceptable play or wire diameter.

Or possibly because of a motor problem putting excessive load on start up.. Maybe small amount of water building up in cylinders?

I noticed the subject was accidentally getting changed....grin

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Jerry/MT

10-02-2004 21:57:57




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 Re: TO30 Starter 6V 12V Hand Crank in reply to Jim W, 10-02-2004 05:09:06  
Jim, To my recollection the internal heat generated in the starter is equal to I^2 xR, where I is the currrent in amps and R is the resistance in ohms. Certainly the power output at the shaft is the same, even slightly higher becase of less internal loss in the windings. Since the internal loss of the 12V is less, the heat generated in the windings is less, and thus the duty cycle of a 6V starter operated at at 12 V is easier.

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steveormary

10-02-2004 08:56:21




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 Re: TO30 Starter 6V 12V Hand Crank in reply to Jim W, 10-02-2004 05:09:06  
I converted my TO-30 to 12 volt and never had starter problems.



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