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John Deere Tractors Discussion Forum
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starter switch on jd 720 standard --problem

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BILL NOLAN

10-30-2005 07:01:21




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HI I CAN USE SOME ADVISE -- I HAVE A RESTORED 720 WHEATLAND ( IN NEW YORK) AND THE SWITCH MUNTED ON THE STARTER DOES NOT MAKE CONTACT. IF I GO UNDERNETH AND POKE IT IN AND OUT WITH A SCREW DRIVE IT WILL SOMETIMES MAKE CONTACT AND WORK FOR A FEW DAYS. IS THIS SWITCH A SOLINOID ? OR JUST A SET OF CONTACTS -- CORRECT PART NAME? I FIRST SUSPECTED THE LINKAGE FROM THE STARTER PEDAL BUT THAT IS FINE - IT PUSHES THE PLUNGER ON THIS SWITCH IN -- BUT NO ACTION - CAN I JUST GET A NEW ONE WITH CLEAN CONTACT AND REPLACE IT ? I LOVE ALL MY GREEN IRON BUT DIDN'T HAVE THE BENIFIT OF GROWING UP WITH THEM SO I AM LOST -- THANKS FOR ANY HELP OR INFORMATION. BILL NOLAN 21 ROLLING MEADOW LANE POUND RIDGE, NY 10576

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John T

10-30-2005 15:06:59




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 Re: starter switch on jd 720 standard --problem in reply to BILL NOLAN , 10-30-2005 07:01:21  
Bill, there are usually two mechanical push switches available, one has the extra lil side wire terminal and its for tractors that are 12 volts and use a 6 volt coil plus an external ballast resistor. What it does is serve as the ballast by pass by sending full unballasted battery voltage ONLY WHILE CRANKING from that extra starter switch terminal up to the coil. The other switches are identical but DO NOT HAVE that extra lil side terminal and arent for tractors that use or require the ballast bypass circuit. So, does your tractor have a 6 volt coil and an external ballast resistor?? If so I would use the switch equipped with the extra lil side terminal and run a wire from it up to the coil. NOTE either switch will still start the tractor and even if no ballast by pass were used she will still run the same and usually start as well, its just that if its real cold the ballast by pass can increase sparking energy while cranking.

If the starter post (on starter under that switch) is pitted or burned, I usually clean n wire brush n light file them.

John T

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BILL NOLAN

10-30-2005 17:45:25




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 Re: starter switch on jd 720 standard --problem in reply to John T, 10-30-2005 15:06:59  
thanks john -- i understsnd what you are saying -- my 720 does have a 12 volt battery and a 6 volt coil ( and the ballest ) - i would never have thought of it but you sure are correct -- THANKS SO MUCH FOR THE HELP !!
the starter switch stuck on me once and i had to unhook the battery to stop the starter ( it probably burned the starter post badly at that time . a funny experience the dash switch will not help when that happens -- i don't know if it was the plunger cocking or an electric weld that caused it. Bill

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John T

10-30-2005 19:04:43




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 Re: starter switch on jd 720 standard --problem in reply to BILL NOLAN , 10-30-2005 17:45:25  
Youre right, my 620 has done that when its extremely colddddd d and the starter is drawing excess current, it sticks/welds/burns closed from the heat at the switch to starter post junction.

John T



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BILL NOLAN

10-30-2005 10:43:01




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 Re: starter switch on jd 720 standard --problem in reply to BILL NOLAN , 10-30-2005 07:01:21  
I FOUND OUT THAT THERE IS A STARTER SWITCH ONLY -- NOT A SOLINOID AND IT MECHANICALY CONNECTS THE POST ON THE STARTER WITH THE BATTERY CABLE POST ON THE OUTSIDE OF THE SWITCH -- THEY TEND TO BURN OFF A PIECE OF THE POST WHEN CONNECTIONS HAPPEN. DOES ANYBODY HAVE A CLUE FOR THE PART NUMBER FOR THE STARTER SWITCH MOUNTED ON THE STARTER ON A 720 GASOLINE.? AND CAN YOU GET THEM NEW FROM A DEALER ? OR ONE OF THE ELECTRIC SHOPS IN GREEN MAG. ? THANKS .
ALSO IS THE SWITCH THE SAME ON A MODEL 70 GAS AND A 720 GAS ? THANKS BILL

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F-I-T

10-30-2005 11:15:51




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 Re: starter switch on jd 720 standard --problem in reply to BILL NOLAN , 10-30-2005 10:43:01  
Bill:

You can probably find those switches just about anywhere, but your dealer can get them as well.

Here is the switch number for a 720 gas from JDParts.com:

Part Details Part Number: AR11115 Part Price: 20.99 USD Description: SWITCH,STARTING MOTOR Also, Bill, take your caps lock off. All-caps is "internet speak" for shouting.

Frank



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