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Gibsonville, NC | We are experiencing a problem with our 4455 JD tractor. It has a power shift transmission. We ground corn with it one day, parked it, and went to move it next day and nothing worked. The tractor cranks, but you put it in gear and it doesn't move, pto doesn't turn, the arms at the back won't go up and down.
We had a mechanic come check it out and he said the hydraulic pump at the front of the tractor had pressure. He seems to think it was an internal hydraulic line bust. Meaning we would have to take the cab off, break it in pieces and get inside the transmission to replace the hydraulic line. I seem to think it's more of a minor problem but not sure.
Has clean hydraulic oil, new filters, clean sump screen. Any advice or help would be great.
Edited by bdeath 11/27/2017 10:22
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Warburg, AB | Steering work? SCV's work? Issue with a priority valve? Did he pressure test it and see if clutch packs have oil? Is there a test port for the main "clutch"/inching pedal circuit? |
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east central Ontario | We had a similar incidence with a 6310. It was a solenoid which senses oil pressure which won't allow any to flow to other areas. Easy fix but was a took a long time to pin point. |
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South Central ND | How about the seat. Does it go up when you start it? That's on the priority circuit as well. If you have those then it's a problem elsewhere. |
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Gibsonville, NC | Steering doesn't work. SCVs do not work. Not sure about priority valve or clutch packs. |
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Gibsonville, NC | I can't remember the last time the seat went up when we started it. The tractor is older than I am. We bout it new and I am 22. |
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Gibsonville, NC | Could this be a pump problem? |
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Schlegel Farms, Hagerstown Indiana | I can't help..................but it sure makes me feel old when I hear someone say "That tractor is older than I am about a 4455", :-( |
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Renville County, MN | I could be wrong but I would check and make sure that the transmission pump did not shear off the drive key. That can be removed without out a split or taking to much apart. That has to supply oil to main pump so you would have no hydraulics or trans. Not sure but I guess this is what happened. Pump can be removed by taking of valve housing on left side of clutch housing. |
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Faunsdale, AL | I cannot think of a failure that would leave the front pump with "pressure" but the tractor not drive and the pto not turn.
If there is oil being pumped forward to the front pump, the tractor should drive normally......might not steer or have brakes etc but if the transmission pump is working the transmission and pto should turn.
So I suspect the diagnosis of "pressure" in??/at??/from?? front pump is incorrect.
The only way I can see there being pressure to front pump and tractor not driving is if the transmission pump drives off the pto gear train AND that direct drives from the flywheel through the center of the torsional dampener that drives the powershift transmission......AND the damper was sheared so no power transmitted to the transmission. Tractor would have hydraulics, steering and brakes. Lots of "and's " there so I doubt that scenario.
Just not familiar with the 55 series with the trans pump behind the control valve and how it is driven from the engine.
Had a trans pump failure on our 4955 and tractor would not drive, had no pto and had NO hydraulic functions at all. Which makes sense because there was no oil being pumped to the transmission or front pump. Replaced the transmission pump and got it to drive and pto worked but still no hydraulics.......turns out we had cooked the front pump by running the engine with no oil coming forward while the transmission pump was failed. Live and learn i guess......but it gets expensive sometimes! Replaced the front pump and we were back to normal.
On the 20, 30 and 40 series power shift tractors, the transmission pump is driven from the transmission input shaft that sticks into the torsional dampener mounted on the flywheel. So EVERYTHING goes out at once when the dampener fails. I suspect that is also the case with the 50, 55 and 60 series as well even though the trans pump is gear driven and mounted in transmission behind the transmission control valve on left side of the tractor.
Edited by ccjersey 11/26/2017 20:12
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SW South Dakota | Did you check the lever on the left side by the filters that disconnects the hydraulics and transmission to start easier when cold to make sure it didn't get switched? We had somebody flip one of ours once as a joke. |
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Faunsdale, AL | TOW/DRIVE lever?
It doesn't affect the hydraulics at all, just disconnects the wheels so the tractor can be safely towed without damaging the transmission.
The 20 series tractors with the 8 speed powershift had a transmission disconnect clutch between the engine and transmission that was used to make it easier to start the engine with cold transmission oil etc. Lever looked like the pto lever but it was on left side of the cowling instead of on the right like the pto. |
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Blue Grass (Eastern IA) | Those tractors have a safety system that won't let it go into gear if you move theshift lever before it senses pressure, or if you jump the starter with it in gear. Something simple to check. |
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S.E. Washington | That function is called the engagement override valve. A simple cycling of the clutch pedal resets it. Plus the main hydraulics would not be affected by this. I suspect we are all dealing with incorrect and incomplete information from the diagnosing tech and op. I vote with the guys who are pointing to the trans pump not working, whatever the cause of that may be, we need better info. |
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Wallis, TX | I'm with you on this, I can't think of any failure that would cause this. Since it is a 15 speed it has the clutch packs in the flywheel and no torsional dampener I'm thinking the trans pump may be crank driven like a quad but still doesn't make sense why there isn't hydraulics since he has pressure out the front pump. |
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South Central ND | I'm going to lean with the other guys and say check the tranny pump. When started the tractor drives the tranny pump to run up to the main pump. The main pump then provides oil to your priority valve. When steering brakes and the seat is satisfied, oil is then diverted to auxiliary functions such as scv's. Then it runs to three cooler. The last thing to be satisfied would be the lube circuit. I would check again to see if there is spec pressure at the pump. I highly doubt it. Also check tranny pump pressure. If none, that's the problem.
Somebody will let me know if I got this wrong, i may have to go back and reread my books but I'm pretty sure that's how that works. |
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Gibsonville, NC | Yes we had to move the tow/drive lever before we moved it. I dont think that is causing the problems we are having. |
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Gibsonville, NC | checked it. it goes in gear just doesnt move |
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Gibsonville, NC | Thanks for the post, I will check on that. |
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south texas | The trans pump is driven by the same big gear that runs the pto. Its almost the size of the trans case at the pump
I suspect the front pump doesn't have flow but may be making some pressure but not correctly. The trans pump could be bad or shaft / gear failure. The big gear is driven by the shaft from the flywheel drum. It spins all the time. Pilbec (I spelled that wrong but its close) is very knowledgeable on these trans. U can test the trans pump with a 300lb gauge and some fittings. U don't have to buy the jd quick connects, just pull them and get the adaptors. I can't remember the pressure to front pump. Maybe 175 but that is a guess. Too many projects since then |
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Gibsonville, NC | So you think it's either one, the trans pump that's gone bad on the left side of the tractor under the steps/battery box. Or two, the gear has gone bad inside that the trans pump runs? Someone told me there is a hydraulic line that's inside the transmission that could've busted and the only way to get to it is split the tractor into and take off the cab. Could this be true? |
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south texas | Its odd that it stopped all of a ssudden. Like someone said pump could have sheared shaft. Take the line off under steps by door going to front pump. Turn over tractor with fuel shut off and see if oil comes out the valve body. If it does, hook a pressure gauge to the port and see what it is. If no oil pull the valve body and check the pump and gear out. Big ggear in trans shoul have some back lash but not much. Pry it up and down. U shouldn't be able to spin it without turning engine. U did make sure oil was at valve body from sump screen tube right?
I don't know what line inside would fail resulting in zero flow to front pump but I only been in one 15spd
If u get some pressure out the trans pump, have deere or u get a book and pressure test trans. Need to know whats going on before tearing it up. |
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Gibsonville, NC | I'm home from college (NC State) for a few days and managed to take off the transmission oil pump. When I unbolted it from the valve housing and from the manifold, I saw the shaft that has the big gear on the pump had a bad bearing and the drive key (woodruff key) was sheared. Got the parts oredered and will have it back together mid next week. Appreciate everyone's follow up posts and help. If I have anymore problems I'll start a new thread. . |
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| What about your problem with JD 4455 transmission?
I have the same trouble with 4055.
Thank you! |
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Faunsdale, AL | Did you notice the part where he took off the control valve and found bad bearing and sheared key on transmission pump drive?
Transmission pump can go out suddenly while operating or even when shuttingdown/upon startup. |
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4455 power shift JD
