Static axle load capacity (weight when not moving) for the rear axle of current model SCUTs is a bit over 2000 lb. For the front axle, it's a bit under 2000 lb. The axles will support considerably more, but the extra is reserved for the resulting G-force when driving over a bump at speed.
The back hoe for a SCUT weighs 700-800 lb and that will use up the available static load capacity of the rear axle.
Front axles are routinely overloaded when a FEL is involved.
Tire load ratings are per tire. In this case there is a speed rating attached. Above the rated speed, the load rating drops. Below the rated speed, the load rating increases. Note that most SCUTs have a top speed of about 9 mph, or about half of the listed speed rating. When carrying a payload in the bucket, it is rare to expect the tractor to move even that fast.
Liquid ballast in the tires is supported by the ground and has no effect on the axle load carrying capacity. Likewise, wheel weights are supported by the air in the tires and also have no effect on axle load carrying capacity.
The 26x12-12 rear turf
tires can carry up to 140 lb of Rim Guard each. R4s will have somewhat less capacity.
The weight (including ballast) on the rear axle is at maximum before payload is placed in the bucket. As bucket payload is increased, load on the rear axle is decreased at a rate of approximately 60% of the weight of the payload. That rear axle weight reduction is transferred as an increase to the front axle. I noticed that the effect of payload weights is not included in the Ballast Calculator. It is
included in the chart for an X7xx GT located in Post #10 of this thread
. While the weights are not the same, the proportions are in the same ball park.
Figure out the load on the front axle with a capacity payload in the bucket. It's an eye opener!
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Sometimes you get on a roll, sometimes the roll gets on you.
MF GC2310, Husqvarna YTH20B42T
Down for Repairs
MF1655 w/ FEL, MF1655, MF12H, MF8H, MF7H
Spending too much time on MTF to work on my toys.