question about loader capacity vs tractor (long)

[RobS]

Quick math example:

Let's say your load is 1000 pounds and the distance from the load to the lift pivot is 5 feet. At a right angle that is 5000 foot-pounds of torque which will translate into a proportional load on the lift cylinder (fulcrum). If you then curl such that your load moves out another foot, your torque goes up to 6000 foot-pounds with a proportional increase in load on the fulcrum. That's pretty significant increase. If the load were within the confines of the bucket, the lever arm increase would not be nearly as much.

A drawing would be a lot easier to understand than words /forums/images/graemlins/smile.gif

 

[RobS]

Quick math example:

Let's say your load is 1000 pounds and the distance from the load to the lift pivot is 5 feet. At a right angle that is 5000 foot-pounds of torque which will translate into a proportional load on the lift cylinder (fulcrum). If you then curl such that your load moves out another foot, your torque goes up to 6000 foot-pounds with a proportional increase in load on the fulcrum. That's pretty significant increase. If the load were within the confines of the bucket, the lever arm increase would not be nearly as much.

A drawing would be a lot easier to understand than words /forums/images/graemlins/smile.gif

 

[coasterez]

I agree with madreferee. If you are damaging your cylinders by lifting those hunkers, shouldn't you stop doing that? Otherwise, have you thought about skidding them from the 3ph? If you absolutely need to lift them that high to get them into a truck or something, then I think a bigger machine is your only recourse. Unless JD will keep replacing your cynlinders for free /forums/images/graemlins/grin.gif

 

[coasterez]

I agree with madreferee. If you are damaging your cylinders by lifting those hunkers, shouldn't you stop doing that? Otherwise, have you thought about skidding them from the 3ph? If you absolutely need to lift them that high to get them into a truck or something, then I think a bigger machine is your only recourse. Unless JD will keep replacing your cynlinders for free /forums/images/graemlins/grin.gif

 

[Highbeam]

I expect the relief valve to release hydraulic pressure in the event of overload. Regardless of whether the cylinder is being used or not. I would love to know if this is not how the hydraulic system operates on our tractors.

So imagine that you raise your empty loader bucket and start adding weight. Maybe concrete. Eventually something has to give. I expect the hydraulics to release and the loader to come down before the rods buckle.

 

[Highbeam]

I expect the relief valve to release hydraulic pressure in the event of overload. Regardless of whether the cylinder is being used or not. I would love to know if this is not how the hydraulic system operates on our tractors.

So imagine that you raise your empty loader bucket and start adding weight. Maybe concrete. Eventually something has to give. I expect the hydraulics to release and the loader to come down before the rods buckle.

 

[RobS]

The more I think about this (dangerous) the more I believe the relief valve is not involved. When the loader valve (SCV) is actuated the pump is in circuit with the cylinder. Somewhere in there is the relief valve as well. When the SCV is not actuated, the cylinder is isolated from the pump. Wouldn't there have to be a seperate relief valve in each circuit for it to relieve when the SCV is not actuated?

I'll not volunteer to test this but I may check my tech manual this evening /forums/images/graemlins/smile.gif

 

[RobS]

The more I think about this (dangerous) the more I believe the relief valve is not involved. When the loader valve (SCV) is actuated the pump is in circuit with the cylinder. Somewhere in there is the relief valve as well. When the SCV is not actuated, the cylinder is isolated from the pump. Wouldn't there have to be a seperate relief valve in each circuit for it to relieve when the SCV is not actuated?

I'll not volunteer to test this but I may check my tech manual this evening /forums/images/graemlins/smile.gif

 

[firemanpat2910]

If the problem is only when you lift that high what about digging a "Dock" and lowering the truck or build up a "ramp"to raise the loader? might be safer too.

 

[firemanpat2910]

If the problem is only when you lift that high what about digging a "Dock" and lowering the truck or build up a "ramp"to raise the loader? might be safer too.

 

[wushaw]

The patient said: "Doc it hurts when I do this" Doc says don't do that /forums/images/graemlins/grin.gif

The loader arms are stuck out there pretty far and vulnerable to overloading.
I say don't lift it that high...just high enough to move the stump.

 

[wushaw]

The patient said: "Doc it hurts when I do this" Doc says don't do that /forums/images/graemlins/grin.gif

The loader arms are stuck out there pretty far and vulnerable to overloading.
I say don't lift it that high...just high enough to move the stump.

 

[firemanpat2910]

I was going to say the same thing"Dont do this!"

 

[firemanpat2910]

I was going to say the same thing"Dont do this!"

 

[MadReferee]

</font><font color="blue" class="small">( The more I think about this (dangerous) the more I believe the relief valve is not involved. When the loader valve (SCV) is actuated the pump is in circuit with the cylinder. Somewhere in there is the relief valve as well. When the SCV is not actuated, the cylinder is isolated from the pump. Wouldn't there have to be a seperate relief valve in each circuit for it to relieve when the SCV is not actuated?
)</font>

Yes, in fact some heavy equipment have valves with a main relief and a relief for each spool. My 1963 TD6 dozer with Drott loader is that way. The control valve has a main relief which doubles as the system relief and an individual relief on each spool.

 

[MadReferee]

</font><font color="blue" class="small">( The more I think about this (dangerous) the more I believe the relief valve is not involved. When the loader valve (SCV) is actuated the pump is in circuit with the cylinder. Somewhere in there is the relief valve as well. When the SCV is not actuated, the cylinder is isolated from the pump. Wouldn't there have to be a seperate relief valve in each circuit for it to relieve when the SCV is not actuated?
)</font>

Yes, in fact some heavy equipment have valves with a main relief and a relief for each spool. My 1963 TD6 dozer with Drott loader is that way. The control valve has a main relief which doubles as the system relief and an individual relief on each spool.

 

[BarryinMN]

I would vote for a larger tractor. It'll get the work done with less drama.

Pix of a 5 ton tractor with a Buick LeSabre out on the tip of 42" pallet forks. I blew a hole in the fork tips to put a trailer ball in.

 

[BarryinMN]

I would vote for a larger tractor. It'll get the work done with less drama.

Pix of a 5 ton tractor with a Buick LeSabre out on the tip of 42" pallet forks. I blew a hole in the fork tips to put a trailer ball in.

 

[PineRidge]

This is what we used to clear the land of stumps before the pond was dug. Wham, bam, thank you mam and it was done.

 

[PineRidge]

This is what we used to clear the land of stumps before the pond was dug. Wham, bam, thank you mam and it was done.