JD 420 Lawn and Garden PTO problem.

   / JD 420 Lawn and Garden PTO problem. #1  

Eric_Whitney

New member
Joined
Jul 13, 2003
Messages
20
Location
Columbus Ohio
Tractor
Ford 1210
I have JD 420 Lawn and Garden tractor. I am having a problem blowing the main 20 amp fuse when engaging the PTO. After replacing the fuse the tractor starts and runs fine untill the PTO is engaged. I did see a Electromagnetic PTO Clutch parts list on the JD parts site. Could this be going bad? Any ideas where to start?
 
   / JD 420 Lawn and Garden PTO problem. #2  
Yeah it sounds like the clutch is grounding out. Check the wires that run to the clutch to make sure there are no shorts leading to the clutch. If that's all Ok check the windings of the electromagnet on the clutch for shorts or too much resistance. I'd guess it's time for a new clutch, they tend to be expensive if you can't buy individual replacement parts. Good luck.
 
   / JD 420 Lawn and Garden PTO problem. #3  
Might not be the problem but I have a JD322. I follow a news group on Yahoo and there is always a lot of mention about checking th air gap in the electric PTO. Seems to solve a lot of problems. There are three locations to put the feeler gauge. The book says to check each one a few times as you adjust. There are three nuts that control the gap and changing one could change the other. Might want to check that out before you buy parts just to be sure.

Craig
 
   / JD 420 Lawn and Garden PTO problem. #4  
I would definitely inspect the wires to the clutch before purchasing a new clutch. You may even be able to unplug the connection at the pto clutch & then try the switch. If that proves ok, remove the clutch & inspect it. You may see a place where the wire coming out of the clutch has a piece of insulation rubbed off.
 
   / JD 420 Lawn and Garden PTO problem.
  • Thread Starter
#5  
Thanks for the input. I will check the PTO clutch out this weekend.
 
   / JD 420 Lawn and Garden PTO problem. #6  
how do you engage the pto on a 420 john deere
 
   / JD 420 Lawn and Garden PTO problem. #7  
how do you engage the pto on a 420 john deere

When the optional rear PTO is added to the tractor, a second electric toggle switch is added to the dash next to the front PTO switch.
 

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