alright, it is QSV (quad stage mast) with the class 2 carriage. All functions are normal with nominal loading. It is related to a higher pressure in the system, it feels like the selenoid just doesn't have what it takes to allow loaded freefall at the preset rate.

This is the opposite function, it will not come down with heavier loads, and almost ALWAYS does it at any height even 6 inches off the ground. The lift properly stages, mast is properly adjusted, including chains and roller shims, the carriage rollers are adjusted correctly and the tracks are clean and free of debris. I have also observed the rollers within the track at the maximum load stated on the dataplate, or three tugger batteries. We also inked the tracks to see if there was a scrub spot that for whatever reason we weren't catching. Nothing unusual. We did all this to eliminate it as a cause. I've also personally observed operating environment of these lifts, they should not be malfunctioning under these conditions at all.

I have to stay far ahead on PMs and weekly/daily checks here because these lifts never rest, they are operated 21.5 hours a day, and that is no joke. Having four of my fleet and that number continues to grow as we are forced to repurpose the lifts around the plant for people who don't use them for heavy pallets or stack. That is becoming an issue for management when they cannot reassign personnel to help out in a different department for this reason. It anyone has any ideas, I am all ears.

Also wanted to say Toyota has pretty much said it cannot be their electronics, sensors or valves. And that they wouldn't consider it a factory defect.