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My name is James and I have a problem with a John Deere F725. It will start and run smoothly without the PTO activqted. I can turn on the PTO to operate the blades and the F725 will operate normally for 2 to 3 minutes then starts cutting out badly. I can then turn off the PTO and the F725 will return to running smoothly after 4 or 5 seconds. I have replaced the fuel pump, both spark plugs, fuel filter, and air filter but still has the problem. I have also jumped out the

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6ya6ya
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Posted on Jan 02, 2017

  • 86 Answers

SOURCE: lawn tractor shuts off after 20 minutes of running

How old is your ? Sounds like ignition problem,If your engine is older you would have points when the points are bad they can stick together and will result in shutdown after unit cools a little it will restart !

Posted on May 09, 2009

mickey813
  • 472 Answers

SOURCE: I have a John Deere LX173 that won't start. I

WHAT MOTER IS IT

Posted on Oct 02, 2009

  • 52 Answers

SOURCE: John Deere 445 Garden Tractor, starts immediately,

could be bad gas, but it sounds like a choke problem. did it sit over the winter with less than a half tank of gas in it. try putting some rubbing alcohol in the fuel or draining the tank and disconnecting the gas line so you can drain the gas out of the carb. also check the gap of the spark plug and make sure that is correct. when was the last time there was fresh oil put in. also check the air filter, it could be full of dirt.

Posted on Apr 18, 2010

Testimonial: "Thanks for the ideas. I will try your suggestions. Tractor used for snow blowing during the winter and gas did not stay in it long. Good ideas!"

  • 1 Answer

SOURCE: John Deere will not start.

If you have gas running down to the carberator ( take the fuel line off and make sure there is gas running to it or there may be a screen or filter plugged by the tank or on the way to the carb) if there is gas there the problem lies in the carb itself. If you have some mechanical ability you should be all right as it is not rocket science. If you are comfortable with taking the carb apart the first thing i would check is the needle vavle. With the carb apart you will see a big brass looking thing this is the float, right above that is the neddle valve, that is the first place they seem to stick on me. Move the float up and down if the neddle above it doesn't move or sticks there is your problem. Spray it with carb cleaner and see if it moves freely. You may have to dismantle the carb to get it to work freely. If it won't buy a carb kit and install all the new gaskets needle valves and jets ( this is a very good ideal any how) Also make sure any little ports in the carb are open ( in the bottom of the carb there may be tiny little holes that are plugged) find a very small wire to clean them with and also make sure when you are done you can spray carb cleaner thru them. This is why they have a small straw on the can with it ( watch your eyes and wear safety glasses as you never know where it will spray out from) That stuff will dry your skin out fast so don't get it in your eyes and you may want to wear rubber gloves. Also be very careful when putting back together as there are little pieces that like to slide around and fall out or may get bent even worse you don't want them in your motor. Also try to count every screw you turn as these are jets and you will want to put them back to the place they were set at cause it's a pain to get them set right by adjusting them later. Do not force anything putting it back as you may bend the jets or float and you will have to take it apart again and replace them as well. Take your time and be patient and you will be just fine

Posted on May 08, 2010

Testimonial: "thanks...you gave me encouragement to give it a try. I took off the shroud, air cleaner box and couldn't take off the carb as there are no heads on the four bolts that hold it on. Looks like it was designed not to be removed? I took off an inspection plate on top of the carb and cleaned all of the channels and ports within with carb cleaner and compressed air...still no gas flowing thru carb...unless I force with compressed air. Any other thoughts? It is a twin cylinder OHV B/S. Thank you. "

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SOURCE: John Deere 115 lawn tractor - won't start.

I have a 115 john deere tractor that runs but the engine will not run smooth I've put a new fuel cap on it a new pump and clean out the carb.

Posted on Aug 18, 2010

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John Deere x300 series 2009 model I unhooked the kill wire and it started. But now my mower/pto will not engage is there a way to bypass the sensor?


Based on the combination problems involving the coil kill wire and the PTO activation, I would suspect the PTO switch is bad.

I do not have a schematic for the 300x, however I most of the functions are comparable to the LA 145, 165, 175.

The PTO switch is a multifunction switch. It will have 3 to 4 different functions internally. On the LA 175 it serves 3 functions. These 3 internal functions are independent of one another. Electronically they are known as single pole/single throw switches. In other words even though they are all housed inside a single unit they act light 3 separate light switches in your house.

One function ("light switch") controls your cranking system. When the key is turned to Start, power flows from the Key switch (purple wire) to the PTO switch. With the PTO switch off it flow out (purple/white) and goes to the Brake switch. If the Brake is set the power flows through to the starter solenoid and your engine cranks.

Another "light switch" inside the PTO switch controls the Blade Clutch. Power flows from the Key switch, in run position, (yellow wire) to the PTO switch. With the PTO switch on it flows out another yellow wire to the Blade Clutch. A DC volt meter should show 12 volts switching on and off as the PTO is turned on and off.

The third "light switch" completes a Ground Path. This ground path is a totally separate pathway running through the PTO switch. The ground system is fairly complex because it operates differently under different scenarios.

To produce a spark, the key switch must be in the start or run position. While starting the PTO must be off and the brake set. The seat switch does not matter at this point.

Once the engine is running the seat switch plays a part if the PTO is activated or the Brake is released. Someone must be in the seat.
The Kill system is activated
  1. When the key switch is turned off.
  2. When the operator leaves the seat without setting the brake and turning off the PTO.
  3. When the machine is reversed while the PTO is engaged and the back up switch (RIS) is not pressed.

So there are three different paths to ground; any of which can kill the engine by grounding the coil. Except for turning off the key, all other grounding functions flow through the "grounding light switch" in the PTO.

Because you have a combination problem, the Coil kill wire is grounding the engine and the Blade Clutch won't activate the blades; both of which are affected by the PTO switch, odds are you have a bad PTO.

Obviously there are too many complex functions to just bypass the switch. You will have to replace it. The part number you need is AM135131. You can do a site search to locate and order this replacement switch for about $26.00 including shipping at this site: GreenPartStore Parts for John Deere Lawn Tractors John Deere Lawn Garden...

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EBay has one listed for sale

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I need a diagram that shows me how to replace the belt on my F725 front deck john deer mower


hi there pauly46 here

type f725 in the search box - under j/d cataloue

here is web site adress to go to that page
http://jdpc.deere.com/jdpc/servlet/com.deere.u90490.partscatalog.view.servlets.HomePageServlet_Alt?search=model&model=f725

select f725 ,select sectional index , select mower deck and lift linkage,select mower drive belts sheaves and spindles ,

then a window with deck parts and diagram will appear

print this off

it will give a good idea of belt routing for deck


take a look and hope it helps

cheers pauly46

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The wireing to the relay,battery power to pin 30.Purple wire should be on pin 87.Other purple wire that gets power from the safety swutches has power to it only if all the safeties are in place ,pin 86.Pin 85 is a ground wire.If the park brake is on and the pto is off and you are sitting on the seat then it should start.If it does'nt the you need a key switch,a starter relay,or as starter.

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1 Answer

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its likely to be a switch playing you up try hard wireing the switch to see if it stops this cutting out first, do one switch at a time till you fine the one playing up

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1 Answer

Battery lite glows when pto is engaged after running for 5min


The charging circuits used on smaller tractors are generally barely adequate for the load presented to them, so it is important that the tractor engine is running fast enough especially when using PTO power. If your tractor has a tachometer on it, JD has an indication of the motor speed you should use when using the PTO. If not, it is generally pretty close to max. It should sound like it is running smoothly although fast, and not with whining or rough sounds from the engine.

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