1086 T/A

Russell Moore · May 10, 2014

I haven't had my 1086 long and have been fixing things as I go along
this past week we used it to plant corn giving it its first big workout
I have had a problem at low rpms with the power steering and brakes not working right
while we were planting corn at lower rpms I started having problems with the t/a
we were running the t/a forward in the high position and when we turned it and applies the brake the t/a would kick back to slower speed but once we throttled back up it was fine
My question is will that weak power steering pump make the t/a do that
Thanks

Janicholson · May 10, 2014

The Hydraulic system is probably either low on fluid, or has an Oring going bad. The MCV system operates these components. The easy and reasonable "repair" that works for years, is to over fill it by five gallons. It hurts nothing, and it sure beats digging into it with a bunch of tools and time. If no joy, it was a cheap attempt. Jim

Owen Aaland · May 10, 2014

A weak pump is the most likely cause but it could also be due to leakage between the pump and the MCV.

My normal procedure with these symptoms is to remove the MCV and inspect for problems. If I don't find any blown O-rings I would replace the pump.

Russell Moore · May 10, 2014

I know the hydraulic oil is full
once the tractor is warmed up if you go below half throttle i loose steering, power brakes, power clutch, and now the T/A issue
maybe I will try adding another 5 gallons of fluid

Larry B. 1486 · May 10, 2014

It's very hard on the TA running it low on pressure to it. Like the rest said, add 5 gallon over the full mark. I run at least 30 gal in my 1486. Also check the hyd filter. Sounds a lot like the MCV pump getting weak. The MCV pump runs the steering, brakes and TA. A weak pump is one of the reasons of your TA going out. Not enough pressure to hold the clutches together from slipping.

Owen Aaland · May 11, 2014

Another problem with running with a weak pump is that the MCV pump also furnishes lube for the differential and range transmission. On an 86 series tractor the MCV pump is rated at 12 GPM at rated engine speed. The priority valve sends five gallons to the steering which is also used for the TA, brakes, clutch assist, seat, brake lube, and finally TA lube. The remaining flow is sent to the oil cooler and then back to lube the things in the rear frame.

When ever you loose enough flow that the steering and controls are affected all the oil is going through the priority valve orifice and there is no flow to lube the parts in the rear frame.

1086 T/A

Russell Moore

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Janicholson

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Owen Aaland

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Russell Moore

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Larry B. 1486

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Owen Aaland

Well-known Member

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