Checking T/A PSIs April 08, 2013 11:57AM
I was wondering if you could help me with a few questions that I have. This is on a 79 1086 farm tractor. I have the IH service manuals for 66 and 86s. I am checking the T/A and Direct pressures through the bottom of the MCV where it shows the safety valve in the book. I have a neighbor that says that is all wrong that the steering drops the pressure there even though that is what the book shows. He says I need to check it on the side where the pressure regulator is or on top where that T is. How I am checking it now is only at about 200 psi. It has a new MCV pump and new spring in the pressure regulator. Tractor pulling guys told me to just shim the pressure regulator with #10 washers to get it up to 300psi for a farm tractor. Is it ok to get the pressure reading off the bottom safety valve fitting? Or am I wrong.


Thanks for any help.
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Re: Checking T/A PSIs April 09, 2013 01:33PM
you are fine checking it on the bottom. if you shim it be very careful because you could stack the springs and blow a gasket out. Hy Capacity has a spring kit to up the TA pressure. The spring kit is for a 1586.
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Re: Checking T/A PSIs April 09, 2013 02:26PM
The spring kit will help but 300 psi is about stock. You can go a little more and be okay, but 400 psi or more you run the risk of blowing the MCV gaskets. When I did it I cut a soda can to the size of #10 washers and stuck them together with grease. If they get in there cross-ways it will spike the pressure and you will have a mess on the floor, so take your time and make sure the washers lay in there flat. Hope this helps.
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Re: Checking T/A PSIs April 11, 2013 01:39AM
Just to add to the above, be prepared to shut the engine off quickly when checking pressure after changing or shimming springs. I like to have an assistant in the seat with his hand on the throttle. If that pressure spike happens, it happens immediately after the engine lights and if it spikes high enough to blow the MCV gaskets, you would be amazed at the amount of oil that goes everywhere in the few seconds it may take to kill the engine if you're not prepared.
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