Rear Tractor weight for trailer work

Highland Mule

Member
Livestock Farmer
I am struggling to understand your thinking, the rear axle is the fulcrum of either rear wheel weights or a three point linkage weight, the only difference being the leverage force achieved by three point linkage mounting will be multiplied by a factor the further it is moved from the fulcrum thus requiring less weight to achieve the force of wheel weights.
Surely for rear wheel weights the fulcrum would be the front axle? Given the weights apply force directly onto the rear axle, it cannot be the fulcrum.
 
I am struggling to understand your thinking, the rear axle is the fulcrum of either rear wheel weights or a three point linkage weight, the only difference being the leverage force achieved by three point linkage mounting will be multiplied by a factor the further it is moved from the fulcrum thus requiring less weight to achieve the force of wheel weights.
Nah, with rear wheel weights the fulcrum is the front axle - with a counterbalance weight behind the rear axle the rear axle is the fulcrum.
Common mistake to make but once you can visualise it then the penny drops 😉
 

e3120

Member
Mixed Farmer
Location
Northumberland
I am struggling to understand your thinking, the rear axle is the fulcrum of either rear wheel weights or a three point linkage weight, the only difference being the leverage force achieved by three point linkage mounting will be multiplied by a factor the further it is moved from the fulcrum thus requiring less weight to achieve the force of wheel weights.
The wheel weights will have equal weight on either side of the rear axle fulcrum, so achieve no net moment. That said, the front unloading effect of a rear counterweight is often over estimated - probably only 250g for every kg added, unless sticking out a silly distance.
Surely for rear wheel weights the fulcrum would be the front axle? Given the weights apply force directly onto the rear axle, it cannot be the fulcrum.
You can take moments about any fulcrum you wish. In order to calculate the impact on the front axle, the rear axle is chosen, to eliminate the load it exerts. To work out the extra load on the rear due the counterweight, use the front axle as the pivot.
 

puntabrava

Member
Location
Wiltshire
Surely for rear wheel weights the fulcrum would be the front axle? Given the weights apply force directly onto the rear axle, it cannot be the fulcrum.

Nah, with rear wheel weights the fulcrum is the front axle - with a counterbalance weight behind the rear axle the rear axle is the fulcrum.
Common mistake to make but once you can visualise it then the penny drops 😉

The wheel weights will have equal weight on either side of the rear axle fulcrum, so achieve no net moment. That said, the front unloading effect of a rear counterweight is often over estimated - probably only 250g for every kg added, unless sticking out a silly distance.

You can take moments about any fulcrum you wish. In order to calculate the impact on the front axle, the rear axle is chosen, to eliminate the load it exerts. To work out the extra load on the rear due the counterweight, use the front axle as the pivot.
My thinking is obviously wrong then but I need to go into a dark room and think it out😀
 

glasshouse

Member
Location
lothians
I am struggling to understand your thinking, the rear axle is the fulcrum of either rear wheel weights or a three point linkage weight, the only difference being the leverage force achieved by three point linkage mounting will be multiplied by a factor the further it is moved from the fulcrum thus requiring less weight to achieve the force of wheel weights.
You are not wrong
Wheel weights arebetter than nothing
 

Speedstar

Member
Location
Scottish Borders
Any pics of it ?
Here you are , used it on the buckraking tractor and it could tow trailers from job to job with it on
IMG_20211216_091027.jpg
IMG_20211216_091015.jpg
 

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JCB has launched new Fastrac 4000 and 8000 Series tractors with an all-new electronics infrastructure which is claimed to deliver higher levels of performance. According to JCB, the new Fastrac iCon operator environment has three key features: iConfigure – creating a bespoke control experience for every operator iConnect – integrating advanced precision agriculture technology iControl – redefining operation through new driveline software The 175hp to 348hp (133kW to 260kW) Fastracs feature the new iCon armrest console and touch-screen display to provide flexibility in operator allocation and operator information, as well as a new transmission control strategy to enhance operator comfort and powertrain efficiency, says the manufacturer...
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