Weak Loader Curl Possible Solution For the Max28

[mike69440]

Maybe I missed it? but I assume the new 1526 cylinders have the same 25mm rod size?

Correct, 25mm rod.

JUST FYI Some of my Fit up Photos are with the OEM Max28 Cylinders, some are with the 40mm 1526L Cylinders

 

[mike69440]

I am going to invoke my soothsaying powers and predict that an abundance of scratches and dents in your hood will be forthcoming.

As I say, so shall it be.

My L39 Has a nice self leveling bucket, and I still managed to drop a few small rocks on the hood, so I expect it will be a bad day when that happens to the Max.

 

[LD1]

Your math is just a tad off.

Use radius squared not diameter. It's really about 62.5%.

But in reality, it will amount to a tad more power than just 62%. Let me explain.

The smaller cylinder has .73 sq inches on retract side, large one has 1.19.

Two cylinders and 2200psi give you cylinder forces of....

3212# for the 35mm cyls and 5236 for the 40mm cylinders.

But it takes a given force just to hold the empty weight of the bucket, and attachments. Let's say a total of 400# of the cylinders' force is just for the empty weight.

So, the percent gain would look more like (5236-400)/(3212-400)...or....about 72% net gain.

400# is just a guess though. Probably less. And not as provellant on the curl, cause when empty there is little force required. But when dealing with lift cylinder upgrades, it's an important consideration, cause the empty loader takes a given force to lift/hold. Must be factored out. upsizing the cylinder don't make it require any more force to lift the loader empty.

I actually like to figure it at the psi level with a gauge. IE....

I know my loader takes 600psi just to lift/hold an empty bucket. Pressure spec is 2400psi. I adjusted my relief to 2600psi. So one would think I gained (2600/2400)....8% lift. But that's wrong. Because at 2400psi, I have 1800 psi available to lift material. So the correct percent would be 2000/1800....11%.

I hope I didn't lose you

 

[mike69440]

When comparing ratios diameter or radius, both are common denominators. 62.5% is correct, I was going from my foggy old memory.

To calculate the total force you need Pi/4
Your correct on the bucket weight.
I have a spread spreadsheet I developed that takes into account loader ((applies to lift cylinders only) & bucket weight and factors all that out. To lift front edge of bucket on this little thing is about 100 lbs. or so, 72% is a bit high. It takes about 250 PSI to hold the loader with the Max. l
Less the Chassis frame attachment part, the loader and bucket weigh less than 450 lbs., including the 40 lbs. of extra stuff welded to the bucket.

PM me and I'll e-mail anyone the Excel spreadsheet.

 

[mike69440]

McCormick S1.25

http://argotractors.cms.arscolor.com/storage/sito2/x1-25-series-spec-page-web.pdf

Specs are all wrong, but his seems like a beefy small loader.

 

[mike69440]

Oops!: Weak Loader Curl Possible Solution For the Max28

The Adapter Fittings I needed are JIC #5/16 1/2-20 to SAE ORB #6 3/6 9/16-18 Straights.

Just try to find this oddball!

I did, see attachment Phone Number and info at bottom of photo. (Hydraulic Direct)
Great prices on the fittings Freight is bad, but lease i do not need to have new hoses made up. This will set me back a week.
I ordered the wrong fittings from Surplus Center. JIC #4 1/4 7/16- 20 to SAE #6 3/6 9/16-18 Straights. Surplus Center an all the supply catalogs do not list the JIC#5's to SAE anything.

PS two layers of this stuff is what i lined the Pin hole Bores to take out slop going from 1" holes to 25mm pins.
TapeCase 2" width x 3yd length (1 roll), Converted from 3M 3361 Silver High Temperature Stainless Steel/Acrylic Adhesive Foil Tape: Amazon.com: Industrial & Scientific

 

[mike69440]

Nor More Weak Loader Curl For the Max28

Ah done! Yes, the curl speed is slower but not painfully slow. and For a quick test i drive the tractor as far as i could into a pile of crushed stone. The lift cylinders were in relief trying to lift the bucket out. Normally the curl would be useless, Id have to back up out of the pile and then lift.
Now the curl just breaks out and scoops. It is the way a loader should behave.

Installation went well, as I have a decent place to work and tools.
The 1526 Cylinders are well built and clean inside.

 

[drajj5]

Well that is a fantastic install. Looks factory to boot! Glad to hear that you were successful with the modification.

I have never torn apart a hydraulic Cylinder like the one in your pic's, I have years ago; rebuilt aircraft tripod jacks while in the military. I would be willing to follow suit but am skittish as you had to mfg. a hydraulic cylinder stop to use the new cylinders, I do not have access to the same folks who you know that built that for you. Other than that- it seems as though all other hurdles were accomplished with 'Off the shelf items'. Perhaps I will see just how much it would cost to fabricate that piece locally.

Thanks for sharing with us all your improved design.

 

[mike69440]

Re: Weak Loader Curl Solution For the Max28

Well that is a fantastic install. Looks factory to boot! Glad to hear that you were successful with the modification.

I have never torn apart a hydraulic Cylinder like the one in your pic's, I have years ago; rebuilt aircraft tripod jacks while in the military. I would be willing to follow suit but am skittish as you had to mfg. a hydraulic cylinder stop to use the new cylinders, I do not have access to the same folks who you know that built that for you. Other than that- it seems as though all other hurdles were accomplished with 'Off the shelf items'. Perhaps I will see just how much it would cost to fabricate that piece locally.

Thanks for sharing with us all your improved design.

One thing I've noticed In the +2 hours I've put on the Max28 since the 40mm Curl cylinders were added is the Regen circuit on the dump sure does fight itself more with the ratio of the extend to retract areas changed. To avoid loading up the pump, I just go to the detent in the dump cycle, not full dump. Slow but most times a slow dump is better at putting material where you want it than a fast dump. Going to regen probably does not hurt anything, it is just harder and longer with the bigger cylinders. On a hot summer day working the loader hard, I suspect the oil will heat up.
The Cylinders on my L39 and excavator heat up, as they should as their oil pumps are 3X and 7X the capacity on the Max28's

If anyone needs machine work, I suggest going to your local Vocational Trade School and speaking with an instructor regarding your project.

Back when I lifted the Sears LT1000 lawn tractor, the 35mm cylinders were just up to the task, I figure the lawn tractor weighs between 400-450 Lbs.
With the 40 mm cylinders, I moved my Landpride 15-84 box blade and did not have a problem. It weighs about 550 lbs. I think the maximum pallet capacity would be almost 900 Lbs. with this setup.
So I did not have to walk the excavator a distance to load some rock in the L39 bucket, I used the L39's BH to load rock on the Max28 to move the rocks to the excavator, where I'm doing some wall repair.
I'm glad I have 700Lbs of counter weight on the Max28. The concrete CW has a bit of metal cast inside. (see photo)

The Max28 has plenty of Lift Cylinder for its size. Up sizing the Lift cylinders would severely overload the front axle, powers steering and the loader in general.
The strength of the loader function seems nicely balanced now. Its stronger than just about any other small tractor.

 

[mike69440]

Making a weld shop.

I'm preparing an area in my equipment building for a weld shop. To move this 475 Lb. steel table I could have put in on a dolly to get it out of the building. Or I could have craned it out with the L39's BH. But this is just what a good small tractor is for. The table top is 84" x 18" x 3/4" thk. and the bottom shelf is 74 X 14 x 1/2" thk.
Just out of curiosity, I measured lift point to loader pivot pin distance at 60". As I have a pressure gauge mounted on the loader control, I measured what pressure was needed to lift using the lift arm cylinders. It took near 2000 PSI. But using the bigger 40mm curl cylinders it took about 1300 Psi to curl.

The OEM 35 mm curl cylinders would have been maxed out, if they even could curl that much of a cantilevered load.

The power steering was taxed to turn the wheels if not moving even on the shop floor.

I figure the table was the equal of 1000 lbs in the bucket.