[RoseHillFarmIHCC125]

Ok guys in an earlier thread, y’all helped me get my 125 to travel in reverse and determine that my relief valves aren’t malfunctioning. Brakes are adjusted per the manual, and linkage adjustment was performed per the manual. Linkage has been lubed with aerosol white lithium grease because that’s what I had on hand. With the tractor on jack stands, directional operation works, no binding in the control lever on the dash. Here’s the question:

I was moving dirt yesterday with my Brinly scrape blade turned 180° so I can back up and push the dirt. About half the time, I would move the control lever to 100% reverse and the tractor would begin to move, then accelerate in reverse to full reverse speed. It’s acting like the swashplate is lagging behind the linkage. Has anyone ever experienced this? Engine is stable at 100% throttle. No issues in forward, just reverse. What steps can I take to troubleshoot this?