My 3 point lift arms are not 'bottomed out' when my mower is mounted on flat ground. So if you imagine the tractor backed up to the edge of a cliff, the mower would drop maybe a foot before 'bottoming out' the lift arms and hanging in mid air.
So I'm thinking if I set my lift arms up so that this settling didn't occur, it might help with the scalping.
This mower has been a real PITA. It cuts nice but I'm kinda wishing I just bought a nice brush hog.
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From what it appears in your photo image the problem is that the original anti scalp skids are gone.
At some time prior to this the skids were removed or worn off.
Properly adjusted skids prevent the mower from nosediving and breaking side slicer knives and knife hangers
If you are able to loosen the clamp bolts for both the lower links go ahead and reposition the lower link arms up at least 2 teeth counter clockwise that will help a lot. if you have telescoping lower link arms on that mule unclip them and remove them before loosening the clamp bolt for both lower links so you have less weight to deal with and after you have reset their position by 2 teeth reset and pin the lower links with the arms fully extended.
Use a fine tip sharpie to locate the gear tooth at 12:00 before you remove the lower links as it will be easier to manage and not cause the lower links to be off a degree or 2 as remounting the mower or other implement will become a real PIA.
Use the sharpie to mark the inside position of the two teeth to the left of the 12:00 position ON THE STUB SHAFT and you will not lose track of the point where you must set the lower link arm. Please be careful when removing it as it is going to be very heavy.
Perhaps if you have a sheave pulley you can hang it over 2 or three rafters with a piece of rope prior to removing the lower link lift arms as it will prevent any surprises like losing your grip on the lower link arm-been there done that NOT PRETTY even the small ones hurt.
If you have telescoping lower links on this mule they should be pulled out all the way and then pinned back into place.
Flail mowers with wheel sets mounted in front prevent scalping more effectively and keep the mower from dropping and breaking knives and knife hangers.
Happy mowing Thoner7