I am afraid that with your symptoms, you have probably failed the torsional damper in the flywheel. Either that or the hydro shaft is broken or has stripped splines. The 4200 has no electrical component to make this happen. If there is an electrical problem, engine will shut down when trying to move or turn on pto. Item 3 is the damper, unfortunately splitting tractor is required to repair.
JD 4200 won't go forward or backwards and PTO won't function
- Thread starter Surveyor4200
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Surveyor4200
New member
That doesn't sound great...and I assume there is no way to test this theory without splitting the tractor. If it were a broken shaft, especially an internal one, would it grind or bang or something because I don't hear a thing. I should be receiving my high pressure gauge test kit (no one carries anything in stores anymore) early next week and will test the charge pump and hydrostatic pump and go from there. Would either of the components you mentioned have an affect on the readings in those tests? Thank you for the different perspective.
Zebrafive
Super Member
If failed torsional damper, shaft, or splines, you will not see any pressure at the test posts, since the pump will not be turning.
OP
Surveyor4200
New member
Thank you! That is helpful. I imagine the probability of the hydrostatic pump and charge pump failing at the same time would be relatively low. So if neither test yields a reading; it would be a good indicator that their is a shaft/torsional dampener failure and to check them, right?
Thank you all for the help on this; this is a really valuable group.
PCABE5
Platinum Member
You should still see 100-150 psi at the charge pump test port even if that shaft is broken. It comes from your power steering pump. Your hydrostatic pump should read below that, to zero, if it isn't turning.
Without looking at your tech manual, so I'm making an assumption on your model, but that shaft should be live to your PTO regardless of your hydro. So if you do not have PTO either there would be a good chance that you have something wrong with that shaft/plate.
Without looking at your tech manual, so I'm making an assumption on your model, but that shaft should be live to your PTO regardless of your hydro. So if you do not have PTO either there would be a good chance that you have something wrong with that shaft/plate.
jthibodeau89
Gold Member
As PCABE5 said. The PTO clutch on the 4200 is mechanical and passes through the Hydro drive (mechanically). I had to split my 4300 to repair a linkage rod that broke inside the tunnel. Nor hard to split, just tedious.i did fabricate a set of jack rollers to make the job easier.
Zebrafive
Super Member
Splitting stand/rollers are a must to split. Yours look nice!
stingray1
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I wish you the best of luck with your 4200,mine is the biggest P.O.S. that I have ever owned in my entire life.
beenthere
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stingray1
Must have been abused before you owned it.
My 4300 couldn't be a better investment for me.. bought new and always performs be it logging, moving dirt, mowing off trees, moving pallets of firewood, plowing snow, winging snow, .. whatever and whenever.
Sorry to hear about your 4200.. what ails it?
Other than a smaller engine, think the frame is the same as the 4300 and 4400..
Must have been abused before you owned it.
My 4300 couldn't be a better investment for me.. bought new and always performs be it logging, moving dirt, mowing off trees, moving pallets of firewood, plowing snow, winging snow, .. whatever and whenever.
Sorry to hear about your 4200.. what ails it?
Other than a smaller engine, think the frame is the same as the 4300 and 4400..
Gus3120
New member
Don’t know if you have the problem fixed or not, but I just had the same problem with my 3120 this past weekend and it was the wire to my seat safety switch was severed. I Know you said previous owner disconnected it, but I would look more into it
OP
Surveyor4200
New member
I have finally received the high pressure test kit (since apparently no one carries them in store) and will begin running some tests tonight. It sounds like I'm looking for an issue with something other than pumps/motors in the hydraulic system. Being that it quit working suddenly with no intermittent issues before hand seems less likely to be a pump/motor. While looking at the tech manual, I don't see any troubleshooting solutions for the rear PTO and 'wheels not turning' for the hydrostatic transmission that are similar. I assumed if the pump went out on the hydrostat it would affect only forward and reverse as the PTO is mechanical rather than hydraulic. Thank you all for the input and the ideas. Now that I have the equipment for testing, I will let you know what I find out.
OP
Surveyor4200
New member
Did the engine die when you depressed the F/R pedals or attempt to engage PTO? I would've assumed it would die if the seat switch was broken. I actually reconnected my seat switch while waiting to test all of the hydraulics and it works as it should. If i'm off of the seat and attempt to engage PTO or the pedals, the motor dies.
OP
Surveyor4200
New member
So, I checked all of the test port pressures and didn稚 get a reading. While I was under there, I found some shredded rubber inside the tunnel opening where you access the hydraulic filter and test ports. It looked like it was possibly round and about an inch thick, no telling what the diameter was though. I went back to where it quit working and there in the grass were a bunch of the same shredded rubber. It痴 about the density of a tire cleat. I知 assuming this could be the culprit but have NO IDEA what it could be. Any help would be appreciated.
TractorGuy
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Can't find anything in the parts that look like that.
https://partscatalog.deere.com/jdrc/navigation/equipment/76513
https://partscatalog.deere.com/jdrc/navigation/equipment/76513
jthibodeau89
Gold Member
That's the remains of the torsional damper. It is item 3 in sub-section 6 (crankshaft & flywheel) of the engine section (20 Engine) in the catalog link above. The engine is now mechanically disconnected from the transmission input shaft.
Time to split a tractor. But I think you will also need to pull the bell housing to remove the torsional damper from the flywheel. The front jacks mount to the bell housing, so the rear of the engine block will need to be supported. Perhaps with an engine hoist from the top side. Be advised that the engine will tip on the axle pivot if supported from only one point on the bottom.
Time to split a tractor. But I think you will also need to pull the bell housing to remove the torsional damper from the flywheel. The front jacks mount to the bell housing, so the rear of the engine block will need to be supported. Perhaps with an engine hoist from the top side. Be advised that the engine will tip on the axle pivot if supported from only one point on the bottom.
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jthibodeau89
Gold Member
Thanks Zebrafive. It was well worth the time it took to fabricate the parts. The swivel casters secure to the front mower deck mounting pads and are adjustable. The rear leg is mounted to the mower deck lift pads on the tunnel, and is also height adjustable.
jthibodeau89
Gold Member
Surveyor4200, Did you get your 4200 fixed?
jthibodeau89
Gold Member
Fyi, i saw a torsion damper plate on eBay today.
