Hydro 86 not grabbing every time

BCJohn

New User
When I let off the foot-n-inch, sometimes my Hydro 86 just drifts ahead (correct direction, sloww). If I depress and drop it quicker, she grabs and goes fine with consistent speed but all I'm doing is pulling a 500g sprayer. This happens maybe once every 6 rows, so it's not often. You guys helped me pinpoint the problem and I ordered the service manual and read everything I could. I'm hoping fouled or maladjusted foot-n-inch valve, but one of you guys figured fouled high pressure relief valve is also likely.

Is it worth trying the foot-n-inch re/re and am I right that it's a pretty big job to go do the high pressure relief valve?

Any other ideas on what I should try? I'll do the pressure and flow tests as soon as I find someone with the gear.
 
Most likely your problem is a scored relief valve but it is possible that you may have some debris in the foot-n-inch valve.

The foot-n-inch valve is a pretty simple valve so it certainly would not hurt to check it out. It has a control stem, a spring, some shims to set the pressure, and a poppet valve to seal against the seat. The pedal return spring has to be strong enough to fully return the the control stem when the pedal is released. Once the stem is seated the amount of shims sets the opening pressure.

The relief valves are not too difficult to access. The are contained in the center section and are accessible after after removing some covers on the side of the housing. The tractor does not have to be split to service them.
 
Thanks again for your help, Owen. This tractor has AW32 hydraulic oil in it. For next year, should I be getting HyTran or HyTran Ultra to put in it?
 

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