The Marshall has no bearings near any muck, and the only things that sand will wear are the seals on the front pusher.How will a Marshall cope with sand slurry on wearing parts? We run a couple orbitals and apart from the rubber seal on back door there isn't really any wearing parts and the bearings are well away from muck. Unlike a west! Downside is useless on strawy muck & tend to get tractors dirty.
The beater rotors have large triangular sections on the bottom roughly 40cm section below the spiral. These then connect to the bottom circular discs. These paddles spread slurry very well, and rate is easily controlled with the standard slurry door.
Another advantage of the paddles is the ability to get rid of large stones without any drama. I have accidentally loaded a stone larger than a football. The first thing I knew about a stone being there, was seeing it flying across the field in the tractor mirror
The only time I've broken a shear bolt was forgetting to turn off the pusher when turning at the endrig. It took longer to renew the bolt than it did to grape out enough dung from the beaters for it to restart.
With slurry I insert the pusher speed controller lock pin. I move the pusher in steps to keep the level of slurry fairly constant against the slurry door, instead of leaving the tractor spool switched on and allowing the pusher to travel back at a constant speed as you do for solid dung (mine is set to take 4 minutes to push out a load).