Rear Tractor weight for trailer work

[Highland Mule]

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.

 

[Lofty1984]

Yes we have one from the tractor buckraking days, stanadard tractor front weights on a frame on the rear 3 point linkage & the trailer drawbar went under it & on to the hook no problem, was just over 1200kg

Any pics of it ?

 

[Courier]

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]

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]

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

 

[Drillman]

we experimented with this on the drill this autumn - was like adding an extra 50 hp

]View attachment 1002875View attachment 1002876

Would have probably been simpler to to just turn the rotating flashing idiot light(s) on if you need more power! And if that ain’t enough getting the driver to turn his collar up and glue his phone to his ear will add a few more.

 

[glasshouse]

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]

Any pics of it ?

yes I can do that

 

[Speedstar]

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

 

[Thomas Simpson]

Has anyone ever made a weight for the back of a tractor so that you can hook a trailer on at the same time, can it be done. Has anyone any photos or ideas how it could be done.


View attachment 1002717

we bought one, think it was a french make ALTHIMASSE. 933 couldnt put the power down so bought this and it makes a difference.

 

[95xpower]

What type of weight would i know would work while hooking on a trailer?

Does it have to allow the arms to be near the bottom of the weight?

 

[Dan.gerous]

We use this one, it sits on a frame about 1/2m high when not on the tractor. Has a simple quick hitch system and can be put on and off in no time.

Clears all our trailers even on full lock if you don't take it off.