Interesting. Let us know if the pressure spikes.
It occurs to me that although the center of mass of the liquid is very slightly below the center of the axle (because of partial fill), I'd be surprised if any normal fluid fill moves the
CG of the fluid down very far - maybe not even as far as the bottom of that axle. My guess is still that fluid fill doesn't move overall CG very far either, and as far as the CG of the fluid itself goes, I wonder if that fluid CG might still be within the axle diameter. Not sure it matters, but at least that fluid CG calc is one we don't need Kubota for.
Do you you agree that the critical calculation for side tipping is the change in distance from the ground up to the CG? It also seems to me that as you say, most of that mass is above the axle - although I haven't gotten out there and really taken a look at it. Hmm.... not sure of the significance of the axle here. How did we get on to that in the first place? The axle is a convenient point of reference for working out the center of mass of the rear end is about all it seems to me.
Now for fore & aft tipping there is no doubt that more weight aft does help. Just like putting a 3000 lb boulder in the front bucket enables lots more backhoe abuse - probably enough extra abuse to break things.
BTW. ability to withstand deliberate abuse is THE BIG DIFFERENCE between the
M59 and a real commercial TLB. Counterweighting an
M59 could break things, but counterweighting the JD310 probably won't.
View attachment 752254View attachment 752254