Mine is a subframe mount and the dealer took the nice 'air ride' seat off and installed a much cheaper rotating seat like you discribe. The lower (only) bearing came apart the first time I sat in it with the pin removed. I now see a warning on the net, that this will happen if you don't put the pin back in. I was in one of those situation where I was using the hoe for about a minute, then moving the tractor to the next spot. That pin is a real pain to mess with..
I took the broken rotating seat back to the dealer and exchanged it for the much better OEM seat.
I was going to modify it like shown on John's Tractor site but have since come up with a plan to moun a small fold down seat on the back of the sliding seat.. With the OEM seat slide all the way forward there is enough room for this and I don't compromise the seat belt system.
To answer Johns question, the only time I have oil come out of the vent holes in the plug is when I'm loading/unloading the tractor without ramps and the angle of the climb is kinda steep. Not a big deal and sure beats dealing with ramps. Sure impresses the 'sidewalk supervisors' when I put it in low low 1st/4wd and let it creep up onto the trailer. BTW, my railer has a very low bed since it has a torsion axle.
Steve
I took the broken rotating seat back to the dealer and exchanged it for the much better OEM seat.
I was going to modify it like shown on John's Tractor site but have since come up with a plan to moun a small fold down seat on the back of the sliding seat.. With the OEM seat slide all the way forward there is enough room for this and I don't compromise the seat belt system.
To answer Johns question, the only time I have oil come out of the vent holes in the plug is when I'm loading/unloading the tractor without ramps and the angle of the climb is kinda steep. Not a big deal and sure beats dealing with ramps. Sure impresses the 'sidewalk supervisors' when I put it in low low 1st/4wd and let it creep up onto the trailer. BTW, my railer has a very low bed since it has a torsion axle.
Steve