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Tractor: John Deere 1025R
Loader: 120R with 53” bucket

I know ballast has been discussed in the past and I have been looking at several different forums and discussions about tractor ballast. I found a ballast calculator that someone created for the 1025R, and what I am confused about is that when I put in the recommended ballast and bucket lifting capacity at the max load of 518 lbs at 500mm forward of pivot pin (in 120R Manual), the calculations show you are over both front and rear axle capacity (continuous) based on Owners manual spec for load lift capacity and ballast recommendations. The front axle is over about 330lbs, see charts below. I do not understand why the manual provides a listed bucket capacity and ballast that would be over the rated axle capacity. Does anyone know what is the maximum axle capacity of the 1025R because the manual show the continuous axle capacity and not max?

Is the axle capacity listed in the manual for 2 front or rear wheels (so 1 axle) or is the axle capacity for each individual wheel. I am trying to determine if the axle or the tires are the limiting factoring in the amount of weight that can be lifted.

When looking at the tire load index / Speed it seems that the tires can hold more weight than the tractor axle can hold assuming axle capacity is for 2 wheels. So it seems like the limiting factor is the tractor axle capacity. I am been looking at the Heavy Hitch or Omni Transformer for rear ballast and trying to determine how much ballast I need to see if I need the Heavy Hitch Dual bracket and also using 70lb suitcase weights. 8 weights * 70lbs = 560lbs which is in the ballpark of the recommended ballast according to the manual but I might need more weight, meaning a dual bracket or weights mounted on hitch. I have been watching many 1025R videos from Tractor Time With Tim and I have seen many videos that he seems to use more than (8) 70lbs weights for ballast.

See attached pictures of spec of load and tires, and excel ballast calculation.

In the end I want to correctly ballast my tractor so I can operate the front end loader safety, and also not damage or stress the axles or tires.
Any help or advice would be greatly appreciated.
 

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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! :tango_face_devil:
 
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