Looseness of the Unloader valve is not an issue as you say that dead ending the auxiliary valve has no effect on the slow lift!!
I think the issue lies elsewhere but ideally need the pressure test!!
Dead ending the aux valve during lift, rules out all problems in the Unloader and flow control valve assy if there is no change to rate of lift ??
While you have unit on the bench remove the union and check the flow control piston and its spring?? This piston (only) is matched to the valve body and could give slow lift, but if it was responsible for your issue the lift would speed up when the aux valve was dead ended!!
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Today's Featured Article - Tractor Traction - by Chris Pratt. Our first bout with traction problems came when cultivatin with our Massey-Harris Pony. Up till then, this tractor had been running a corn grinder and pulling a trailer. It had new unfilled rear tires and no wheel weights. The garden was already sprouting when we hooked up the mid-mount shovel cultivators to the Pony. The seed bed was soft enough that the rear end would spin and slowly work its way to the downhill side of the gardens slight incline. From this, we learned our lesson sinc
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