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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

JD 350 reverser

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dslsr

03-29-2005 16:31:23




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Have a 350 that will not reliably move. Initial pressure check showed low pressure (60 #). Shimmed up the pressure relief with .080 shim and got 65 #. Took out reverser, tore it down, found a couple of scores on the front face of the reverser cover. (the back face of the pump) Took the pump dowels out and had the front cover machined down to remove this scoring. Put new gears (rotors) in the pump, put a new front cover on the pump. Replaced all the seals (metal and rubber) internally in the clutch packs. Replaced one forward disc in the forward pack. Replaced all the springs in the valve body. Replaced the piston seal on the accumulator. Did not touch the rotary valve or the clutch valve in the rear portion of the valve body. Put this all together and result was a tractor that will spin both tracks when it decides it wants to move, but runs a 50/50 chance of not moving when reverser is positioned in either forward or reverse. If you work the F-R lever, it seems very sluggish to respond, if you work the clutch pedal it seems to respond better than the F-R control, but is still quite sluggish to "snap" into engagement. In fact it kind of eases into engagement no matter what. Have not checked the pressures yet, but I'm gambling we will see similar pressures as before, I presume shimming everything like before will provide a hike in relief pressure, but I have the gut feeling our pump is fine, and there is something in the control circuits (F-R or clutch valve) that is dumping control (application) pressure before it gets to the pressure port where we are trying to read pressure. Can someone provide some insight into this problem please?

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Roy Suomi

04-01-2005 21:07:25




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 Re: JD 350 reverser in reply to dslsr, 03-29-2005 16:31:23  
How about the speed of shift adjustable oriface.. On the bottom of reverser valve there is a speed of shift adjustment. I once ran into a similar problem , I removerd the screw from valve, blew some air thru it and reinstalled the adjustment screw.There must have been something in oriface..Worked great after that.. Good Luck



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jdemaris

03-29-2005 19:49:24




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 Re: JD 350 reverser in reply to dslsr, 03-29-2005 16:31:23  
Before I hurt my brain trying to think about all this, tell me the history of the machine up to when the reverser stopped working. Was it working fine, and then, all-of-a-sudden started doing this, or maybe, did you buy it this way? Was there any response when the rate-of-shift jet was backed out? I want to ascertain there were no parts left out, e.g. the orifice in the input shaft if it was changed? Also, when you put the reverser back together, but before you put the control valve assembly on, did you pressure test the clutch packs by blowing air into the delivery tubes on the side of the case? And, you're sure all the o-rings are in place on the tubes? And, when you had the accumulator apart, the travel/stop bolt was intact and the correct length? And, this seems like a stupid question, but you're sure the clutch pedal is coming all the way back?

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dsldr

04-05-2005 18:46:53




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 Re: JD 350 reverser in reply to jdemaris, 03-29-2005 19:49:24  
Hey jdemaris--- I think we got 'er licked. We took the clutch valve/accumulator apart cuz I was convinced there was absolutely nothing wrong with the reverser that we had just rebuilt: Found that the fork that engages the pin that moves the valve was worn into one leg of the fork about 1/8 inch, also the pin was quite worn, also the piston retained inside the barrel with the roll pin had worn the roll pin against the end of the barrel a considerable distance. A number of issues inside that clutch valve operating mechanism was making for a clutch valve that was always looking for a place to be and had nothing to keep it where it belonged. I learned something today. Fortunately everything we did to the reverser was needed due to the fact that we can now generate adequate pressure, but it sure is nice when you can get 'em back together and have 'em work. It takes a situation like this to remind you that although you understand how a powershift works and can work on it and find damaged parts, it still doesn't mean you can always make it work. Time to "use your head". Thank you for all your guidance, and keeping me from thinking I had lost my mind.

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jdemaris

04-06-2005 05:41:48




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 Re: JD 350 reverser in reply to dsldr, 04-05-2005 18:46:53  
Glad you figured it out. It not a fun job to remove and reinstall that valve body with the reverser in-place. I assume your's was a little easier than most since it had been off recently. I've replaced, or repaired many of those forks - it a common wear item that gets checked during any rebuild.



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dsldr

04-06-2005 19:38:27




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 Re: JD 350 reverser in reply to jdemaris, 04-06-2005 05:41:48  
The clutch valve/accumulator section isn't too bad to do in place, but I think anyone would be quite challenged to get the main valve body section off with rev in place. I've kicked my self in the backside many times for overhauling that reverser and never giving the clutch valve section a second thought. Just put it back on thinking I was in my right mind (yeah, right) and that all would be well. Guess again.

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jdemaris

04-07-2005 05:30:48




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 Re: JD 350 reverser in reply to dsldr, 04-06-2005 19:38:27  
You CAN get the entire valve body off. You have to get the studs out first. I've had to remove many of them, usually out in the woods somewhere and 20 degrees F. It's an awful job.



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dsldr

04-03-2005 17:33:32




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 Re: JD 350 reverser in reply to jdemaris, 03-29-2005 19:49:24  
Thanks for all your suggestiions, and here ar your answers:
1)Machine was bought this way. Unknowingly of course. This fellow found me and asked me about buying a dozer. I referred him to some 450's and 550's, he called me and told me he found this 350, to which I replied "I thought you wanted a dozer?" He assured me it was meticulously maintained and all fluids were changed regularly, to which i replied "The only reason a 350 is for sale is because something is wrong with it." He bought it, and soon after he got it home, 1/2 hour or so, he had a problem.
2) No change in shift quality or speed by changing the rate of shift screw. Doesn't affect the rate at which it will stop moving. Has new orifice tube in rate of shift valve, installed according to directions with orifice.
3) Yes the orifice in the input is there and clean.
4)Did not do the air pressure checks. All seals, rubber and steel were replaced. Pressure before repair would not go above 60 psi; now it will go to 125 when it works.
5) All the o rings are on the fluid tubes out of the valve body.
6) Stop bolt is intact and set to proper dimension. (was OK before repair)
7) Pedal will not come back any farther and will not respond differently if held back. Not hitting floorplate.

I did receive word back from him that the rotary valve was loose on the shaft. If this is the case, would it be possible to restrict application pressure if the valve is wandering around? I am convinced the problem lies somewhere in the control valve and not in the reverser itself, because when it drives, it will spin both tracks without hesitation.

Thank you all for your responses and helpful hints. This site is a keeper.

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MrBill

03-31-2005 11:32:29




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 Re: JD 350 reverser in reply to jdemaris, 03-29-2005 19:49:24  
JD, you sure know how to cover all the bases. I had a problem with the clutch pedal return spring. I reached down and pulled it back and the dozer took off. Simple problem for such a brain teaser.
MrBill



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