Pressure and orifice size are the determinents for putting heat into fluid. Speed for moving the spool is of such minimal time in comparison as to have little effect. If the spool is held at a position that is less than full for an extended time, then the reduced orifice size can add measurable heat to the system, but the cylinders will bottom out in only a few seconds at which point it becomes the relief valve that is generating the heat.
Under normal loader operating conditions, there is ample rest time between the use of the cylinders to allow heat to transfer through the large surface are of the cylinders and lines. When stuck in the mud, the bucket cylinders see a much higher frequency of use and can't discharge the heat as rapidly as it's being made. But the arm cylinders don't move much in the same situation and the fluid in the cylinders ends up being much cooler. Tip; periodically cycle the arm cylinders to full stroke to get that cooler fluid back into circulation.
It won't help much, but it will make a difference. Most of my loader work is snow removal and my tractor lives outside at sub zero temps. SOP upon starting the engine is to fully exercise all cylinders full stroke from 2-4 times, depending on ambient temperature, to move the cold fluid out of the lines and cylinders back to the reservoir and add some heat in the process. It's the same idea, just working at the other end of the thermometer.
How fast and far you move the control handle is of little consequence to the loader frame or you. The only effect for the loader frame is how fast it moves. The same effect can be created by adjusting the throttle. Since you are moving the handle, your body should automatically adjust for the change of operating speed. The effect on the handle with rapid movement is actually of more concern. I've broken handle linkages and handles in the past with no visible effects for the loader frame. On the other hand, if the handle breaks then
your body will notice the lack
of resistance to movement.
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Sometimes you get on a roll, sometimes the roll gets on you.
MF GC2310, Husqvarna YTH20B42T
Down for Repairs
MF1655 w/ FEL, MF1655, MF12H, MF8H, MF7H
Spending too much time on MTF to work on my toys.