Yanmar RS1202 Tiller project

[bmaverick]

I never found any instructions for fill so I put in just enough oil to flow from the gear case over to the PTO gear. There's no barrier between them.

I don't recall quantity, maybe a quart? Same oil is used in the front 4x4 axle so its something to keep on hand.

Maybe Ernie has better advice.

The Yanmar tillers from the mid-2010s still require a PTO overrun-clutch on the tractors like our YM machines do. And these tillers have the same drive layout as their Japan tillers. So in English, I would follow the Yanmar manual below as the guide for the oil and the fill level.

Other than the Yanmar RT Series tillers, I've not come across any Yanmar tillers with OPS manuals.

See attached.

 

[MarshSt]

Thanks for the info guys. I'm still finishing up the new driveline so checking bearings and lube will be next. Hopefully have it under power this weekend.
Steve

 

[Williy]

Will this help???

willy

 

[careyo63]

I think that tractor must have a built in ORC. looking at how safe it operates.........

 

[MarshSt]

The mount and driveline is done and the unit is on and under power. Modifying the driveline was a bit more work than I anticipated. I split the original double yoke and used the two ends to create the slip section (3/4 solid sq bar) and added a 3/8 shear bolt at the drive end. For the tiller end 16 spline I made a set screw collar for the original yoke and ground a dimple (spline too hard to drill) in one spline to engage the set screw. I held the tiller back to allow room for all of the driveline parts but it could have come forward a little and still had decent engagement on the slip segment. The driveline is the most complicated and potentially expensive part of the 2 to 3-point conversion IMO.
The Oil has been changed in both the gearbox and chain case, the original gearbox "oil" was water first out the drain hole then pudding. Chain case oil didn't look bad when I drained it. Both will be changed again after some use. The lower RH bearing is a little corroded and sloppy but still spun easily, I gave it a wipe down in place and added fresh grease. It will be replaced before any real use. I gave it a short test run on my gokart track and it did a nice job about 2" deep to stir up the surface except it found every rock I didn't know I had.
Steve

 

[YanmarFever]

I converted a few of these 2 point tillers to 3 point back in the day. I welded arms on the side of the top shaft and drilled holes for the 2 pins, then used a longer pto shaft.