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2090 PS and hydraulic problems please help

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casepoor

05-14-2008 08:47:23




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First I will give a little background on the tractor. It is an early model 2090 that was bought at an auction and ran relatively good; no problems were foreseen at this point. After a while when you started it everything was fine but the steering would be locked up and you would have to rev the motor until it would work. I am a novice at the hydraulics on these tractors and have not resolved this one yet. I suspect a relief valve. Moving on the tractor then began losing power in low and high range. It will not even pull itself in third gear, however if you are in first, or any other gear, and you shift to intermediate it has all the power you need. Therefore the torque limiter is not the problem. I installed gauges on all the ports on the control valve and all were good. I ran though the ranges 20 times and Lub. was 55-65 psi(hot-cold) and all the clutches were 185-195 psi. Then I noticed that if you are moving and you hold the steering against the stop it will come to a stop and the lub. oil pressure goes to 5 psi, when you let loose the pressure comes up and the tractor begins to move again. So I decided that I should get to work fixing it. I first pulled the PS control valve and the only thing I found wrong was that one on the tabbed keepers for the c-2 (I believe)retard valve ball and spring was on the front side of the CV and had traveled through the oil passage. I could see on the gasket where the spring had been rubbing. After all that my question is: Could this be causing the loss of power in low and high ranges?

Any help is appreciated. Thanks

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casepoor

05-15-2008 05:31:39




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 Re: 2090 PS and hydraulic problems please help in reply to casepoor, 05-14-2008 08:47:23  
First of all I would like to thank all of you for helping me with this and I really appreciate it. Right now I have the PS CV apart on the bench but will soon have it back together. I plan on changing the hyd filters and inspect/clean the suction screen before I start it back up. I will then do the tests that you all have suggested. When I say loose power its not the engine laboring or anything it just barely moves and will finally reach the point that it feels like it fully engages. Kind of like if the torque limiter was slipping bad but if you bump it to 2nd range it will almost pop a wheely so I figure the TL is good and solid. As far as having something wrong in the PS itself I think I would see a pressure drop on one of the clutches if I had a internal leak or something broken. I must have a oil flow problem somewhere external. I do not have a 2090 service manual so I am basing my conclusions from my experience with 4890 powershifts. Saying that on a 4890 the cold oil relief valve can have an effect on the steering; is this the same for 2090 hyd?

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dwag

05-14-2008 20:04:44




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 Re: 2090 PS and hydraulic problems please help in reply to casepoor, 05-14-2008 08:47:23  
Your symptoms seem odd. If you had a lube problem, I don't think 3rd power shift would be affected???(C2&C3) That said, your steering pump needs to be flow checked as you shouldn't drop lube press when "cramping wheels. I would venture lube press on your tractor drops while "cramping" steering whether moving or stopped, indicating a bad pump as suggested by mEL or possibly a plugged hyd suction screen. You could have 2 separate issues going on with trans.

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mEl

05-15-2008 04:15:48




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 Re: 2090 PS and hydraulic problems please help in reply to dwag, 05-14-2008 20:04:44  
Do not over look the clutch cable as suggested by the other post, If the clutch spool is not bottoming in its valve it will affect C2 clutch pressure allowing slippage. As the other post said also and I repeat, verify that the steering pump is flowing its rated capacity, if you are losing the lube pressure with the steering cramped you have a bad pump or a leak somewhere between the pump and the PS valva, you cannot lose that lube pressure. It is reading slightly low and I suspect low flow may be responsible for that.

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JoeBob/IN

05-14-2008 18:40:00




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 Re: 2090 PS and hydraulic problems please help in reply to casepoor, 05-14-2008 08:47:23  
When you say lose power do you mean the engine really labors and loses power or she just quits forward movement? I had a 2390 that would hesitate just a bit between 2nd and 3rd powershift and tried like all get out to adjust the retard valves to cure it. Finally found that the inching pedal cable was hanging up about 1/8" from full disengagement and causing the slightest leak which caused the delay. Had a 1070 do what yours is doing minus the steering problem and it was the 6 bolts that hold the clutch pack together, they shear off and allow the clutches to not engage. Simple cure and pretty cheap. You can hook to the remote outlets with say a disc and raise it while in all three powershift gears and check if any are slower or not responsive at all. Report back and someone will either know the problem or at least have another direction to shoot. Not gonna guarantee anything I have said as I am in no way a qualified mechanic! Just worked on a few myself to save a ton of money!

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corey c

05-14-2008 14:28:41




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 Re: 2090 PS and hydraulic problems please help in reply to casepoor, 05-14-2008 08:47:23  
Start the tractor and leave the gear shift in park. Leave tractor at idle lower three point hitch. Pull the lever to raise the hitch all the way WHILE shifting from 1,2,3 and 3,2,1. Does the hitch stop moving when you shift in any of the ranges. Let me know what happens. We will get you through this.
Also i have seen the suction screen in the transmission plug up causing problems.



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casepoor

05-14-2008 09:43:56




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 Re: 2090 PS and hydraulic problems please help in reply to richardinnz, 05-14-2008 08:47:23  

mEl, said: (quoted from post at 11:20:07 05/14/08) Inall likely hood you will be replacing the steering pump, it is not pumping enough to keep the reverse lockout spool engaged giving you the drive problems that you are experiencing. mEl


That is one thing I forgot to mention is that I have already replaced that pump as recommended by a mechanic. It helped nothing what so ever although it was a used but good pump. I might also mention that it was replaced to try and cure the steering problem long before it started to loose power.

Thank you.

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mEl,

05-14-2008 09:20:07




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 Re: 2090 PS and hydraulic problems please help in reply to casepoor, 05-14-2008 08:47:23  
Inall likely hood you will be replacing the steering pump, it is not pumping enough to keep the reverse lockout spool engaged giving you the drive problems that you are experiencing. mEl



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