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Farmall & IHC Tractors Discussion Forum
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Help for IH 1486 Hydraulics

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Francisco Lopez

05-21-2004 15:44:27




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I would be very grateful if I could get advice on the problems Iīm experiencing.
I must tell I got this tractor early this year and was parked for almost a year. I did work on the engine like injectors, pump, belts,change radiator changed clutch,shaft etc.
1.-Brakes were checked, discks all of them allright only change the "o"rings and bleed air. But air almost never got it out. The pedal is still soft. Where could I be getting this air from?
2.- Decided to use the tractor on a flat surface to plow.Tractor is able to raise and turn the implement.After half an hour of plowing it is very evident that the power to raise the implement is reduced because takes more time to do it. Also to turn the plow it gets almost impossible. I open a house to see if it wasn't clugged and noticed oil very thin (no very hot). Filter was chenged before operating it almost 1 month ago. I inspected the oil cooler and noticed there is no flow even with the tractor running. No flow from the multiple control valve.
As you may know there are two pumps, one for the brakes and steering and the other for the 3 point and plow.
I would be very grateful if any of you could provide advise. All suggestions are more than wellcome.

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the tractor vet

05-21-2004 17:24:03




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 Re: Help for IH 1486 Hydraulics in reply to Francisco Lopez, 05-21-2004 15:44:27  
Fist i need to know if it has the open center system or the PFC system, as for the no flow at the oil cooler then i would GUESS that there is a problem in the MCV with a stuck valve or weak spring . We can play lets try this or that all day but the best way is to take it in and have the system flow rated as this will save time and money . Ther are vary few that have a Flow Rater to work with other then the dealers , myself am one of the lucky ones but i can only do the open center systems as i have not come up with the other part to do the pfc's and they can drive a sobber man to drinken with out it.

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Francisco Lopez

05-21-2004 18:08:20




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 Re: Re: Help for IH 1486 Hydraulics in reply to the tractor vet, 05-21-2004 17:24:03  
Dear Tractor Vet
First of all thank you very much for your prompt reply.I must confess that I lack knowledge on the tractors subject and other thing is that my tractor is located in contry side in Mexico,So Iīd like you to keep this in mine to provide advise. I donīt know if the tractor is with open center system or the PFC system, if you give me any idea on how to answer this I will let you know.
Before I forget this idea let me tell that the stuck valve or spring, would explain the lack of flow in the oil cooler but would not explain why the 3 point decreses the speed as a lack of power because it gets too slow.The 3 point works with the main pump whereas the power stereeng, brakes and cooler with the MCV pump. Am I right? Could it be possible that the safety oy relief valve is worn out on the sit and is openning before the rated pressure?
I contacted the local dealer and you can imagine the answer they dont service such old tractors, they can sell some spares and thatīs it. I thought that using a flow/pressure meter would be great but they dont have such a tool.
Iīm sure you can come back with some ideas and Iīd like you to think about this, would it be too expensive to repace the MCV with a new or a rebuilt one? Any idea if there is a kit to replace springs and the realted suff? Thanks Francisco.

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the tractor vet

05-22-2004 17:22:29




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 Re: Re: Re: Help for IH 1486 Hydraulics in reply to Francisco Lopez, 05-21-2004 18:08:20  
Ok , easy way to tell if ya got open center or the PFC loolk on the lower part of the right hand control pannel down by the cab floor and if there are two - three colored small levers then it is a PFC system if not then it is the open center and also if it is a later modle then it is a PFC but i don't remember if it was 79 or 80 that they started using the PFC . You can do a flow check with a pressure gauge a high pressure valve and a container that will hold ten gal of oil and a watch , Get a couple pices of 1/2inch hdy. hose and some fitting and install the pressure gauge inline then install the valve after the gauge and then the othere pice of hose into the container plug into one of the remotes and warm the hdy. up to operating temp and run the engine at pto speed and open the remote valve and hold and shut the valve and see at what pressure the releif kicks out you will have to hold the remote valve open as it will kick out first . Make sure that you don't run the system out of oil, i do the releif test withe hose dumping back into the fill tube first then the bucket , just don't hold the releif test for more then a few seconds . then with the valve open do a 30 sec. full flow into the bucket and see how many gal. you got then times two is about what the pump is putting out then do a test with a 1000 psi on the gauge by closing the valve part way and see how many gal. you get in thiry sec. . Now on to part two of the problem the MCV there are new spring kits out there i have always got them from HY CAPACITY along with the new gskt. kit and my pumps , This may mean a trip across the border.

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Francisco López

05-24-2004 20:36:02




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 Re: Re: Re: Re: Help for IH 1486 Hydraulics in reply to the tractor vet, 05-22-2004 17:22:29  
Dear Tractor Vet
Thanks again for your advice.
I just came back form the place where the tractor is located. I spent sunday doing some work and I will try to explain what I did before reading your note.
First of all I drain oil and check prefilter ( metal mesh) and filter. To my surprise both were blocked mainly the mesh. Second I dismantled the MCV and found it dirty, at the time removing each piston and spring I inspected them carefully and found all of them with scratches even one of them with pitting, I polished all of them with sand paper and placed them back. Also the springs inspected and were fine (Although I canīt say any thing about the tension). I washed all the stuff with diesel includind the bolck itself. Filled with oil and run it.
Like magic EVERYTHING WORKED FINE. I did not find any air coming out when brakes were bleed.
The only thing I donīt like is that I donīt have an exact conclusion of what it could have been, either the filters or the MCV.
Any how I think I will have to get pistons and springs and also spare pumps.
I will keep in mind your advice on how to meassure flow and pressure.
Just one last request, Could you pass the info on HY CAPACITY to me? I got the URL or web page and have sent e-mails but no reply at all.
Finally, Iīd like to thank MMM who reply to my need of help and also tofor your help, for your time and interest.I really appreciate your help. Regards Francisco.

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MMM

05-22-2004 11:54:56




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 Re: Re: Re: Help for IH 1486 Hydraulics in reply to Francisco Lopez, 05-21-2004 18:08:20  
It's likely there's only one pump. The MCV has a flow divider for power steering and then flows through cooler. Difficult steering and no flow through cooler sounds like flow divider could be problem. It should be furtherest forward plug underneath MCV. Fix that first, then i'd change oil as I figure no cooling affected viscosity and hence 3pt operation. Good luck.



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