John, My Kubota loader (LA852) manual mentions ballast in tires, wheel weights, and 3PH implements but not in a very complete manner. It has a matrix that lists 6' box scraper, rotary tiller, and backhoe and gives the weights respectively as 990 lbs, 530 lbs, and (blank). Liquid ballast for rear tires is listed as 450 lbs through 495 lbs depending on what strength CaCl solution is used to fill to 75% full. I don't want to use liquid ballast in tires, yet if ever as I will likely go foam filled.
sIDE NOTE: It says use no liquid in front tires or weights on front wheels!!!
There is a note listed...
Note: When mounting a heavy rear implement, liquid in the tire may not be required.
OK, based on that what would you do? I will perform the experiment to empirically determine the 3PH weight required to handle the FEL at max capacity and then add a safety margin (in addition to the operator).
One small point, John, on which I dissagree with yor post. The required weight in the rear would only be equal to the weight in the front if the lever arms are equal. GlueGuy and other pilot fellas are hip to weight and ballance calculations where the moment (product of weight and distance from datum) is the operative value not just weight. Consider a teeter totter. A 200 lb guy would ballance a 100 lb guy if the 200 lb guy was only half as far from the fulcrum as the 100 lb guy. Say 10 ft and 5 ft. 10x100 = 5x200
Tractor ballasting works like that too.
As a part of the empirical method I could determine the location of the center of gravity of the tractor and then simple measurements would finish the job. That is for puting 1800 lbs in the loader bucket what weight under the 3PH would balance that? Measure the distance from bucket to CG. Multiply 1800 times that distance and divide by distance from CG to 3PH. That gives weight required for ballance. Less weight than that would still work because the tractor can pick up some weight without tipping over on its nose with no counter ballancing. Hence my previously stated empirical approach: 1800 lbs or so in bucket and see what weight on 3PH is needed to keep tractor from nosing over. Add a safety factor but stay under max 3PH load.
Kubota could have been a bit more complete in this section of the manual!
Patrick
sIDE NOTE: It says use no liquid in front tires or weights on front wheels!!!
There is a note listed...
Note: When mounting a heavy rear implement, liquid in the tire may not be required.
OK, based on that what would you do? I will perform the experiment to empirically determine the 3PH weight required to handle the FEL at max capacity and then add a safety margin (in addition to the operator).
One small point, John, on which I dissagree with yor post. The required weight in the rear would only be equal to the weight in the front if the lever arms are equal. GlueGuy and other pilot fellas are hip to weight and ballance calculations where the moment (product of weight and distance from datum) is the operative value not just weight. Consider a teeter totter. A 200 lb guy would ballance a 100 lb guy if the 200 lb guy was only half as far from the fulcrum as the 100 lb guy. Say 10 ft and 5 ft. 10x100 = 5x200
Tractor ballasting works like that too.
As a part of the empirical method I could determine the location of the center of gravity of the tractor and then simple measurements would finish the job. That is for puting 1800 lbs in the loader bucket what weight under the 3PH would balance that? Measure the distance from bucket to CG. Multiply 1800 times that distance and divide by distance from CG to 3PH. That gives weight required for ballance. Less weight than that would still work because the tractor can pick up some weight without tipping over on its nose with no counter ballancing. Hence my previously stated empirical approach: 1800 lbs or so in bucket and see what weight on 3PH is needed to keep tractor from nosing over. Add a safety factor but stay under max 3PH load.
Kubota could have been a bit more complete in this section of the manual!
Patrick