Upsized Hydraulic Clyinders for Loaders

[mike69440]

I'm looking a my options to obtain exact fit interchangeable up sized hydraulic cylinders for my tractor's loaders.

These will have to be custom built due to port location, that they are metric sized, and have non standard weird piston stroke and retracted lengths, as well as having metric pin bores.
The replacement DA Hydraulic Cylinders need to be 3000 # welded cylinders.

I have my two tractors that primarily want to increase the curl force on the attachment (Bucket attachment) cylinders. I would not mind also boosting the Lift a bit also.

Attached ismy spreadsheet on the info for the OEM cylinders and the up-rated version, just as an example.

I'm making CAD models and details dimension prints also.

I have a few leads as to where I can source these, but want to first get an idea of the potetial quantity.

PM me if interested in doing a group buy or you just want a copy of the worksheet in Excel format.

 

[100 td]

Just remember you will slow your curl speed down by the corresponding volume change percentage. Boosting lift usually results in bending and failing arms as they are built with the cylinder as the limiting factor. Of course similar things can happen when increasing any cylinders..........

 

[mike69440]

Of course you can kill yourself or break your tractor. The Kubota TLB loaders are twice as stiff/strong as your average Ag Tractor.

Also if your stupid enough to pry with the edge of the bucket, you deserve what will probably happen.

My machine is ballasted over 8,000 Lbs, and I don't plan at trying to lift max capacity to max height.

I just want a small super strong machine that can take full bites out of wet hard piles of gravel really easy. The L39 does this better than most, but I want a bit more. It also has 11-1/2 GPM to the front loader dedicated pump, as it is upgraded from a farm tractor. Most Kubota's have fairly quick loader speed.
Note I have not gone nuts, as a bit of cylinder upsizing affects capacity a lot.

 

[repete]

When considering changes like these it is critical to analyze the load path to the ground. Yes, perhaps you can increase the lift potential with a larger diameter cylinder but that increases the load weight that is transferred through the lift arms, which are connected to the loader frame. From there the frame is connected to most likely the casting of the tractor which is supported by the front axle pivot arrangement. Next in line are the axle bearings and finally the tires (check the rating) before being supported ultimately by the dirt. Get quotes on all of these parts before you do more than perhaps the original design capability of the tractor.

 

[MtnViewRanch]

Why not just increase the PSI, much easier and zero $$$ spent.

 

[mike69440]

When considering changes like these it is critical to analyze the load path to the ground. Yes, perhaps you can increase the lift potential with a larger diameter cylinder but that increases the load weight that is transferred through the lift arms, which are connected to the loader frame. From there the frame is connected to most likely the casting of the tractor which is supported by the front axle pivot arrangement. Next in line are the axle bearings and finally the tires (check the rating) before being supported ultimately by the dirt. Get quotes on all of these parts before you do more than perhaps the original design capability of the tractor.

I am a mechanical engineer. Primarily my career has been designing industrial rotating equipment.

Been doing that for a living for 35 years.

I've had the L39 for 10 years so I am aware of it's capabilities and limitations.

L39 has integrated loader frame, 8 & 10 Ply tires upgraded from OEM 6, I'm running the safe max pressure relief of 2900 PSI

Only real weak point of a L39 is the Grand L front axle. I broke it once when I hit the L39 with my excavator. Just be reasonable when pushing into a pile and lifting, it is fine.

The Max28 is also capable of more than what it leaves the factory also.

I have a 600hp 03 Cobra, plus a lot of other experience of just how far you can push a design.

 

[repete]

I am a mechanical engineer. Primarily my career has been designing industrial rotating equipment.

Been doing that for a living for 35 years.

I've had the L39 for 10 years so I am aware of it's capabilities and limitations.

L39 has integrated loader frame, 8 & 10 Ply tires upgraded from OEM 6, I'm running the safe max pressure relief of 2900 PSI

Only real weak point of a L39 is the Grand L front axle. I broke it once when I hit the L39 with my excavator. Just be reasonable when pushing into a pile and lifting, it is fine.

The Max28 is also capable of more than what it leaves the factory also.

I have a 600hp 03 Cobra, plus a lot of other experience of just how far you can push a design.

Then you are golden as you have examined the situation . I have multiple tractors and multiple trucks and dump trucks and learned lessons the hard way (AKA, expensive way). I have found that many people see solutions to specific problems and fail to look at the total package. Just because it can lift it does not mean when you have a fully loaded bucket and hit a chuckhole in the driveway that everything will be fine.

 

[mike69440]

Then you are golden as you have examined the situation . I have multiple tractors and multiple trucks and dump trucks and learned lessons the hard way (AKA, expensive way). I have found that many people see solutions to specific problems and fail to look at the total package. Just because it can lift it does not mean when you have a fully loaded bucket and hit a chuckhole in the driveway that everything will be fine.

One thing that I think any serious piece of hydraulic equipment needs is an accumulator. I design my hydraulic fixtures with these, and have one on the L39.

The stick response has a 1/2 second delay, that I am very used to. However when you hit the chuck hole, the shock is quite a bit less.

 

[Baby Grand]

Just a suggestion if you decide to use an accumulator: try to design the system so that the accumulator automatically "unloads" when the system is shut down. You can really economize pump/motor size if you use one.

 

[mike69440]

Just a suggestion if you decide to use an accumulator: try to design the system so that the accumulator automatically "unloads" when the system is shut down. You can really economize pump/motor size if you use one.

Yes I agree however, I'm not using the Accumulator like you would in a large excavator., The one on the L39 has a 16 oz. working capacity just to reduce shock.
It's tucked away under the frame.

When the tractor was new I was robbing some gravel down the road, and while traveling back hit some potholes that caused such a pressure spike, ruined the quad seal rings on the main pump. It was covered under warrantee, as they may have not been installed correctly originally. I now drive slower and the tiny accumulator really helps.