JD 4300 stops moving in forward and reverse after a few minutes - engine still runs

   / JD 4300 stops moving in forward and reverse after a few minutes - engine still runs #11  
What pressures does the TM (Tech Manual) for the forward/reverse ports show if OK?
I am guessing 10,000psi covers a lot of different JD equipment. It seems way too high to get accurate low pressure readings.

I am assuming you have the TM
 
   / JD 4300 stops moving in forward and reverse after a few minutes - engine still runs
  • Thread Starter
#12  
What pressures does the TM (Tech Manual) for the forward/reverse ports show if OK?
I am guessing 10,000psi covers a lot of different JD equipment. It seems way too high to get accurate low pressure readings.

I am assuming you have the TM


6000 psi +/- 200 for the pump pressure and 100-150 psi for charge pump pressure. I was looking at a test set like this Hydraulic Pressure Test Coupling Kit it looks like imported junk but I can't see using it more than a few times. If the pump or valves are bad it requires splitting the tractor which would require stands and other tools I don't have. I think I could actually do it but considering expense and time I would take it to a real mechanic at that point.
 
   / JD 4300 stops moving in forward and reverse after a few minutes - engine still runs #13  
The coil is the cruise control. An electromagnet holds the forward pedal position when engaged.

In my opinion, if it were a linkage issue, it would not come back when cool. I broke my forward linkage bar, and the pedal went to the floor. Reverse worked fine, but no forward. Had to split the tractord to replace the link bar that broke.

I assume that you changed the hydrostat filter up in the tunnel, correct.
 
   / JD 4300 stops moving in forward and reverse after a few minutes - engine still runs #14  
My local JD shop would not quote a time estimate to split my tractor. Only $145/hr.

I built the stands in a couple afternoons. Where are you located? 20170626_052240.jpg
 
   / JD 4300 stops moving in forward and reverse after a few minutes - engine still runs
  • Thread Starter
#15  
I assume that you changed the hydrostat filter up in the tunnel, correct.

I did change the transmission fluid filter and the suction screen, is there something else I should have changed too?
 
   / JD 4300 stops moving in forward and reverse after a few minutes - engine still runs #16  
No, just the big filter on the front of the trans. Did you confirm the rubber inlet on the pump? Time to check pressures at trans.
 
   / JD 4300 stops moving in forward and reverse after a few minutes - engine still runs #17  
6000 psi +/- 200 for the pump pressure and 100-150 psi for charge pump pressure. I was looking at a test set like this Hydraulic Pressure Test Coupling Kit it looks like imported junk but I can't see using it more than a few times. If the pump or valves are bad it requires splitting the tractor which would require stands and other tools I don't have. I think I could actually do it but considering expense and time I would take it to a real mechanic at that point.

Ok, for 6000psi, a 10,000psi gauge would be right.
 
   / JD 4300 stops moving in forward and reverse after a few minutes - engine still runs #18  
The coil is the cruise control. An electromagnet holds the forward pedal position when engaged.

In my opinion, if it were a linkage issue, it would not come back when cool. I broke my forward linkage bar, and the pedal went to the floor. Reverse worked fine, but no forward. Had to split the tractord to replace the link bar that broke.

I assume that you changed the hydrostat filter up in the tunnel, correct.

Thanks for ID of coil.
You're probably right, if shutdown/cooling, it runs a few more feet, linkages would not fix themselves.
 
   / JD 4300 stops moving in forward and reverse after a few minutes - engine still runs
  • Thread Starter
#19  
Did you confirm the rubber inlet on the pump?

It just dawned on me that I should double check that. Rubber hose with clamps seems like a weak point.

Your home made stands look great. If I was anywhere near you I'd be making you an offer to try to rent them or might try to weld something up myself. But, to be completely honest, I can't see trying to split the tractor myself. I'm still learning all of this as I go and I don't want to spend the rest of my life hearing I told you so if I didn't fix or made it worse from my otherwise very supportive wife!
 
   / JD 4300 stops moving in forward and reverse after a few minutes - engine still runs #20  
6000 psi +/- 200 for the pump pressure and 100-150 psi for charge pump pressure. I was looking at a test set like this Hydraulic Pressure Test Coupling Kit it looks like imported junk but I can't see using it more than a few times. If the pump or valves are bad it requires splitting the tractor which would require stands and other tools I don't have. I think I could actually do it but considering expense and time I would take it to a real mechanic at that point.


I would make SURE the kit has the correct adapters. It has 6.
 

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