It was a aftermarket piston/ring set and possibly just poor quality. My hope is just deglaze and rehash. The block was machined and honed by a very competent shop that still has skilled guys that know what they’re doing. Rings were fitted to the bore. I used straight thirty weight, but not break in oil. Same shop on the JD 321 and aftermarket market piston set, but I did use break in oil. It’s doing great a season later. I’ll use break in oil again because I have it.
The aftermarket pistons all seem to have a much thicker walled wrist pin than stock too, which adds even more to the balance deficiency. Plus removing the balance gears. I did a K321 in a JD last winter and it did seem to be smoother anywhere above half throttle.
I have a dedicated hydraulic pump and plumbing for the loader system now and I’ll plumb through the new valve to the existing loader joystick . I’m running 1,600 psi on that system, whereas my charge pump output is 650psi. Having repaired hydraulic components for close to thirty years, I never run any system higher than necessary.
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