I am trying to compare several backhoe capabilities but I am not able to find the specifications on a
B21 Backhoe which I believe is a BT751. Kubota has removed the specs off of their website ever since the
B26 has been introduced. If anyone has the backhoe bucket force (lbs) and dipper force, that would be appreciated.
Thanks
SAS
About the back hoe its not as simple as that unfortunately;
What you are referring to is "crowding pressure or force"
it refers to the pressures generated by the excavating machine to do work at a base line measurement.
Digging sandstone rock, strip mined soft coal, and mud are very different animals and it is totally dependent upon the amount of overburden or the compaction of the soils being excavated ONLY in reference to the amount of pressure required to break the suction of the material being excavated.
That alone requires strain gauges to monitor the forces used to break materials in that sense.
What you are saddled with is the operating pressure of the hydraulic system which are regulated by the relief valve of the tractor or if the valve body has a single valve body relief valve or a relief valve for each function which is preferred to protect the machine.
The square area of the digging bucket opening cavity, teeth and bucket edges are all at work here and the bucket is nothing more than a receptacle for the material.
AN old easy trick to do while digging is simply fill the hole with water as yyou work to ease the digging as the water will go every where and aid in breaking the material as well as maintain the trench stability by filling the void created by the excavation.
You have to understand that the back hoe is only as good as the hydraulic cylinders which the builder picked to install on the back hoe based simply on economics.
Please read
The square are of the cylinder piston in use and the pressure generated by the cylinder to do work are the issues here and you need to understand that the cylinders are picked only on price.
The huge mistake made by these builders is the cylinder position as the barrel end of the cylinder should be installed where the rod is is and that is a mistake on thier part collectively.
The upper boom, dipper boom an bucket cylinders are not assembled with internal stop tubes to aid in protecting the cylinder(s) and that is a mistake
as it is only saving them money and will cost you money when they are damaged.
It allows greater reach but it creates greater forces that will damage the cylinders. that has to be taken into account as they are selling a product that can do work and thats all.
