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1086 hydraulic actuated from end


MinnesotaFarmall
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We have a 1086 that has mfwd that uses a switch and a solenoid that actuated the transfer case. It some times will not engage at lower rpm, and then slams into gear. Quick test shows solenoid is getting power. All hydraulics work good and are responsive. The solenoid oil is supplied by the mcv out the top and also has the hydraulic seat option (don't know if that helps diagnose.). I would like to know how much oil pressure I need to the solenoid to make it actuate, and if anyone has a diagram of the internal mechanism before I may need to pull it apart. Our other tractors have a lever to pull, and haven't seen the electric over hydro set up before. Thank you for any insight. 

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   I Don't have the exact answer,    Our Case 430 skid steer has a 12 volt solenoid that locks and unlocks the different attachments, Hay forks, pallet forks'

While sitting in the seat you can see this solenoid,   It looks a lot like your Solenoid unit,   operates in a Pressurized hydraulic system, always lubricated.

This unit will fail, the "O" ring's inside the 12 volt operated hydraulic "Valve" will flake off and prevent the valve from sliding up & down.

A 12 volt solenoid won't have enough power for the magnetic System to overcome a "sliver" of rubber "O" ring wedged in a zero tolerance valve shaft.   

We have replaced our valve 3 times in it's 10 years of service, our valve is used a dozen times a day.

I have tried to disassemble the valve,  it's easier to replace it,  You will find that style online at 2/3rds the price as the Case Dealer.

This is my opinion,   But you told about the low RPM's not engaging the front wheel assist, Perhaps at a low RPM you don't have a solid 12 volts.

My 2 cents,  Jim Droscha 

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Volt meter shows close to 13volts. My initial thoughts were the valve in the solenoid sticking too, but if the machine's rpm is raised, it kicks on, so I'm thinking it is more so pressure related than electrical. I just was wondering if someone had a diagram of the transfer case internals so I could determine if it has internal o rings in it. 

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Called leamans tractor. They said it uses a clutch pack similar to the ones found in a PTO. The hydro feeding it engages the piston. Test the pressures, and they should be close to the t.a. circuit, so around 240-280 and above 280 would be ideal. 

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Did some testing finally and found the solenoid to be open. It is made by ambac fluid power from Illinois. I did a quick Google search and found a couple companies selling their products, but they all seemed to be out of stock. Anyone have some leads? I will try to call them tomorrow. 

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Check with the salvage yards. I am not certain, but I think that may be the same solenoid used for the electric shift on a 6588 and a 3688. I had to fix one years ago and seems I got 3688 parts that worked. It looks the same as the electric TA shift on those tractors anyway.

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  • 10 months later...

I know I'm a year late, but others might find this helpful.  This solenoid coil is used on many pieces of equipment.  The John Deere part number for it is: AR70922 $262.00 online. It is used on all JD equipment with a hydraulic assist axle, from combines, choppers, tractors, backhoes etc..  I am trying a Meyer snowplow "B" coil, $26 at local automotive store.  Seems to work on my Uni-Harvester, but may not be designed for continuous duty and could fail prematurely.  The only physical difference is the Meyer coil comes with a pigtail vs a stud to connect power.

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