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Static rollover happens when the CG moves outside of the pivot point which is the bottom of the downside tire (or tires of pivot is against stop). As long as the CG is “inside” of the down side rear tire the vehicle will not roll. As soon as the CG moves outside
of the pilot point the unit will rollover.
<div>Dynamic rollover when turning at speed changes things because it adds centrifugal force to help shove the CG sideways and make the unit roll sooner.</div>
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<div>With weighted tires, the downside tire has an extra 500# outside of the pivot point trying to tip it, in addition to the 500# or the upside tire holding it back. </div>
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<div>Dennis</div>
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<div id="AppleMailSignature" dir="ltr">Sent from my iPad</div>
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On Sep 2, 2019, at 5:22 PM, Howard Pletcher <<a href="mailto:hrpletch@gmail.com">hrpletch@gmail.com</a>> wrote:<br>
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<div class="gmail_default" style="font-family:tahoma,sans-serif">Wouldn't the extra 500# or so holding the high side down have a greater effect than any change in CG? It seems it would be more stable.</div>
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<div class="gmail_default" style="font-family:tahoma,sans-serif">Howard</div>
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<div dir="ltr" class="gmail_attr">On Mon, Sep 2, 2019 at 5:54 PM Dennis Johnson <<a href="mailto:moscowengnr@outlook.com">moscowengnr@outlook.com</a>> wrote:<br>
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The weighted tires would lower the center of gravity slightly. Assuming the tires were 100% full the CG of the added fluid would be on the axle CG. If less than 100%, then the CG would be slightly lower. The CG of most tractors will be slightly above the axle
center. Tractors with offset final drives would have CG a little higher than those with the final drive in line with the engine crankshaft. Combining the CG of the tires and tractor would lower the overall CG a little bit, making the tractor more stable.<br>
Adding low mounted implements or weights would change this.<br>
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Dennis<br>
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> On Sep 2, 2019, at 2:37 PM, John Hall <<a href="mailto:jtchall@nc.rr.com" target="_blank">jtchall@nc.rr.com</a>> wrote:<br>
> <br>
> All this talk about wide front vs. narrow front got me wondering about something else. Are tractors with fluid filled rears more stable on hills or in quick maneuvering on uneven ground? The reason I ask is that I replaced the tires on a IH utility tractor
we have had since new (1972 454). It has over 8,000 hrs and we have always had weighted tires on it. Well I didn't have time to fill the tires with fluid before I began using it this spring. So far I am liking the less weight for treading on wet spots in fields.
I recently reduced the air pressure (it was at 25, I dropped it to 20) because it was shaking me to death while spraying a field. The only time the loss of weight has been an issue is moving one load of hay--it was digging pretty bad. We do all of our bushogging
with this tractor so there are quite a few banks and hillsides to get into. Wonder if it would be more stable with the fluid in?<br>
> <br>
> John Hall<br>
> <br>
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