Have you checked the vent in the fuel tank cap?..the little hole gets plugged sometimes and causes a problem like this...I realize it only happens with PTO on after 30 minutes....but have you tried running it for a similar length of time without the pto on?...Next time it happens , instead of turning off the PTO...just open the fuel tank and see if it clears up

 

I'm not sure if that model uses a time delay module, but the symptoms sound similar.

 

Haven't tried the gas cap yet just learned it's possibly a issue. So we'll see. If so that'd be a very easy fix. I'll let ya know.

Not sure what a time delay module is... ill have to look.

 

does it restart soon after it stops? Maybe fuel pump

 

After it dies are you able to restart and run as long as pto is off


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Yup it'll restart immediately long as the pto is off. It'll run all day fine. Soon as you turn the pto on and mow. Within 20-30 mins it's chokes off.

 

Ok ,it’s the pto,it’s probably failing and grounding out on the coil,it’s probably throwing the circuit breaker ( if it has one)
Does it choke down or just stop

 

Chokes down to the point of cutting off the motor. Buddy of mine thinks the pto is bad pulling to much from the battery shutting it down.

 

Yes,if it grounds out on the coil,it usually blows a fuse but it mupight just be trying to fail,if you shut off the pto when it chokes down does it pick up and run?
I’m just giving you what happens to a 318 John Deere,don’t know anything about the one you have but they should act the same but it’s only a year old
🤷🏻‍♀️🤷🏻‍♀️
would it be possible to run it without the pto being on for the amounts of time it usually would stop?

 

The dealership let it run with no pto the 1st time thats why they never could recreate the issue. Then the other day they blamed the weather so again they never ran the pto.

When it chokes down...yes if you turn the pto off it'll throttle back up. I'm leaning towards it being the pto clutch.

 

👍👍

 

What engine is on it
So we know if battery powered ignition or magneto

What is strange is pto has a fuse that would blow under a high amp load. Also if clutch shorts out magnetic field would
Be gone and clutch would drop out Pto switch is tied to safety system switches in seat and possibly drive handles

Im not sure I would say it’s pto clutch yet. If clutch was shorted I would not think it would restart and re engage for another 30 min. Imo

When pto is engaged seat safety switch becomes active to kill engine

Does anyone have a wiring diagram


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What engine is on it
So we know if battery powered ignition or magneto

What is strange is pto has a fuse that would blow under a high amp load. Also if clutch shorts out magnetic field would
Be gone and clutch would drop out Pto switch is tied to safety system switches in seat and possibly drive handles

Im not sure I would say it’s pto clutch yet. If clutch was shorted I would not think it would restart and re engage for another 30 min. Imo

When pto is engaged seat safety switch becomes active to kill engine

Does anyone have a wiring diagram


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This is the mowers page on the JD website and the parts page with the breakdowns ive been using

Lawn Mowers | John Deere US

John Deere offers a full line-up of tough, intelligently-designed mowers to meet your needs. Explore our series and decide which mower is right for you.

www.deere.com

https://partscatalog.deere.com/jdrc/navigation/equipment/12463217

 

Here is a similar issue that was resolved:

PTO problems?

On my GX345, I've been chasing a problem lately where the tractor will stall after 10 minutes or so when the PTO is engaged. It mostly happens when I go from forward to reverse quickly or go down hill. I've exhaustively checked the safety switches (all intact and functional now), so I don't...

www.mytractorforum.com

That looked like it was the PTO, but it wasn't

 

I would guess that a seat switch issue would cut the machine off immediately instead of "choking it off" as OP mentioned.

Sounds like next logical step, already suggested, is to run it with no PTO for half an hour and see if the issue repeats. I'd drive it around the yard without the PTO on, during that test. That should eliminate the engine as a cause of the issue.

I don't know enough about the PTO circuit to offer advice, perhaps one of our electrical experts can offer some testing methods. Sounds like might be the PTO, or maybe even a bearing (??) operating temps that cause some kind of lock up?

Just a minor question that might help our members assist with suggestions:

• If you disengage the PTO when it starts to bog down, and the engine then recovers, will it immediately bog down again if you re engage the PTO, or will it continue to cut for a while?

 

You can run it all day with the pto off. Which makes me think it's not anything fuel related. Turn the pto on and within 30 mins it's choking and sputtering....ultimately turning off.

 

Remove the belt from the PTO and run it for an hour or so. Or, just buy the new PTO clutch and install it (and hope you were right that it was the PTO itself).

The PTO could be putting too much load on the system. This could be too much electrical load, but not so much that it blows the fuse. It could be too much mechanical load either from the PTO itself or from the load the PTO is powering (the deck spindles, blades, pulleys).

If you are certain the PTO is bad somehow, replace it. They are not that expensive or that hard to replace. It will either fix the problem or it won't. If it doesn't, you will have to do the next level of troubleshooting.

 

I've got a new pto clutch coming so we'll see.

 

Good,I’m wondering if there’s perhaps some bearings bad and causing the lug down,let us know the outcome.
Just a word of caution,it may have a stub on it that has to go into a hole on the engine to keep it from spinning,assure it goes in that hole,I bought a F525 that had the motor locked up,found it had a new pto and after removing it found out the owner had missed that hole and the motor was locked up,cost me a battery,gave 100$ ,used it 5 years ,sold it for 1000$

 

Replaced the pto clutch with the one linked below.

*

www.warnerptodirect.com

Mowed about a acre and it bogged down once but didn't choke off this time. I left the PTO engaged and it kept running but I had to stop and let the motor throttle back up. So mostly fixed but something is still a little off.

 

How high/thick/wet was the grass?

Sounds like it got too much for the engine to handle. That could be normal, or the engine could be down on power.

 

Just normal height. Nothing crazy.

 

Does the governor seem to be working,good it’s better,sounds like it’s not working

 

I don't believe I ever heard the results of the 30+ min test with PTO on and no load.

Does it only happen with your wife riding it or does it also happen to you?

Could it be the seat switch cutting the engine? If one or both of you are not very heavy, the seat switch might be too sensitive and cut the engine when it is not necessary.

It is likely either not getting spark or fuel when it stumbled or it really could be getting too much fuel/not enough air and really be being choked too much.

If it was mine, I would try and figure out how to easily reproduce the issue.

1. Run the engine, with the PTO on and no load other than the deck blades for 1 hour, while you are sitting still in the seat and the mower is not moving.
2. Run the engine with the PTO on but just driving back and forth on the driveway for an hour.
3. Run the engine with the PTO on driving over previously cut lawn.

It should be able to do that for an hour easily. That will be really boring, but if you don't do this test, you won't know what is really wrong. If you are good with the shotgun method of repair, you can continue replacing parts until it starts working correctly or you get tired and really bring out the shotgun and then you will know why it no longer works at all 😉

 

He mowed an acre so I’m guessing it ran longer than the 30 min before

 

Sometimes there is more than one thing wrong. Sometimes the problem is intermittent and it seems like a change fixed it, but it didn't really do anything. Maybe the PTO could was bad. That seems unlikely (but possible) in a year old machine and something that should have been covered by the warranty (4 year/300 hour, bumper to bumper).

The vent in the gas cap is more likely, since that could have been clogged by insects.

Seat switch cutting out due to bumps seems possible.

The electrical module that controls the spark could be defective. I have heard they can be damaged by jump starting and or battery charging. But, I have never had an issue with either, so no experience there.

It is a mystery, and I am interested in learning what the real issue is.

 

Some more question

Are you mulching or discharging

Is there grass buildup under deck

Is it possible a cylinder is cutting out


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I have a 1 year old JD 515E. Last fall it started turning off after about 30 minutes of mowing with the PTO engaged. The local dealer said they couldn't find anything (aka they didn't really look). Mowing season was over fast forward to about a month ago. I get it out put fresh gas in it mow my back field for about 30 minutes and it sputters to a stop. I've cleaned the fuel lines, replaced the filter, the fuel pump and completely torn apart/cleaned the carburetor. AND it still did it. So I took it back to the dealer they don't really look at anything and throw a new battery in it. (The receipt actually says "could not test mower bc of weather" yet they called me to say it was fixed) Wife tries mowing with it and it still cuts off. So I'm at a loss. I've replaced or cleaned the entire fuel system from the tank to the carburetor. Now it has a new battery. It only happens when the pto is engaged and you're mowing. It takes about 30 mins to happen. As soon as you turn the pto off it runs fine. Could it be electrical? Pto switch,pto clutch.... What do you think????

I had the same problem .i fixed it . You have to take the plastic cover off on the gas tank.. then it’s like a fuel pump . Sitting on top of the gas tank . The one with the orange clip . The holes to the right . If you look closely . You and pop the whole right piece off . It has clips . Pull it out and blow all the dirt out of it . Mines runs prefect now

 

 

This part

 

Was this issue ever resolved? I have the same problem

 

I have a similar issue, but mine has nothing to do with the PTO. It runs for about a minute and then shuts itself off. I actually watched the throttle close itself. Fresh fuel, new plugs and I replaced the carburator. Still doing it. What could cause the throttle to move on it's own?