LPGS For Kubota B2910

/ LPGS For Kubota B2910
  • Thread Starter
#81  
BTW, I made mention of Kubota's maximum recommended implement weights on the 3PH, which I believe are probably fairly conservative.

Here's some additional data:

Maximum Lift Force @ pins: 1655 lbs

Maximum Lift Force 24" behind pins: 1300 lbs

That's the stock rating ... but my PRV is jacked up 200 psi over stock.
 
/ LPGS For Kubota B2910 #82  
I'm no expert, but I just know that my 5' land plane is all my JD 2720 wants to handle when it gets a bit of rock in it. My driveway is on a hill and with the land plane less than half-full, it's spinning all four tires trying to go uphill. I normally go downhill for that reason, but I want to drag some of the rock that washed down back up the hill. My JD is about the size of your Kubota. The JD may be just a tad heavier, and I usually leave the loader on when using the land plane for a little extra weight.

Anyway, look forward to your build!
 
/ LPGS For Kubota B2910
  • Thread Starter
#83  
Worked out all the hydraulic cylinder attachment points and brackets.

The tailgate cylinder is Lion 2 1/2" bore x 10" stroke 2500 psi cylinder with SAE ports. Surplus Center must have an overstock of them (200+ in inventory) and be trying to move them because they were pretty cheap ($50)

It will provide slightly greater than a 90 degree range of motion, with the present bracket geometry and attachment points.

The blade adjustment cylinder is Wolverine (Prince) 2 1/2" bore x 4" stroke 2500 psi cylinder with SAE ports. A little pricier @ $64.

With the present bracket geometry and attachment points, it will provide a blade adjustment range of roughly minus 1 1/2" (cutting edge depth below the skids ... variable, depending on exactly where on the carrier I mount the cutting edge) to a positive height over 9" above the skids (again, varies on cutting edge mounting)

There is a potential interference issue with the top of the blade and my SpeeCo Quick Hitch ... but it's fairly slight. Might see if I can fix that.
 
/ LPGS For Kubota B2910
  • Thread Starter
#84  
I'm no expert, but I just know that my 5' land plane is all my JD 2720 wants to handle when it gets a bit of rock in it. My driveway is on a hill and with the land plane less than half-full, it's spinning all four tires trying to go uphill.
If you haven't already, trying filling the bucket on the FEL ... it'll get ya a little more traction ... wet soil or gravel works good ... ;)

I normally go downhill for that reason, but I want to drag some of the rock that washed down back up the hill.
Have similar issues with our 3PH snowblower (no chains, R4's) ... always blow downhill ... :D

My JD is about the size of your Kubota. The JD may be just a tad heavier, ...
Yup, it is ... very similar machines tho' ...

... and I usually leave the loader on when using the land plane for a little extra weight.
:thumbsup:

Anyway, look forward to your build!
Thanks ... enjoy !
 
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/ LPGS For Kubota B2910
  • Thread Starter
#85  
A few new renders:

Blade down:

LPGS 3-8.jpg

Blade up:

LPGS 3-9.jpg
 
/ LPGS For Kubota B2910
  • Thread Starter
#86  
Non-perspective (flat) sideview with blade up. (You can see the potential inference issue):

LPGS 3-10.jpg
 
/ LPGS For Kubota B2910
  • Thread Starter
#87  
A perspective three-quarter view:

LPGS 3-3.jpg

(Might be more like 10:00 or 11:00 ... :laughing:)
 
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/ LPGS For Kubota B2910 #88  
If you haven't already, trying filling the bucket on the FEL ... it'll get ya a little more traction ... wet soil or gravel works good ... ;)

Last time, I decided I was going to try that next time. ;) Thanks for the tip!
 
/ LPGS For Kubota B2910
  • Thread Starter
#89  
One more from towards the rear:

LPGS 3-1.jpg
 
/ LPGS For Kubota B2910 #90  
Sure do wish I could operate a computer to make pretty drawings like that. Got "sketchUp" downloaded, but too dumb to do anything with it:laughing:
 
/ LPGS For Kubota B2910 #91  
Throw the FEL and bucket (797 lb) on and that 1740 lb tractor instantly becomes a 2600 lb tractor.
Add an 800 lb implement on the rear and it's now a 3400 lb tractor.

I will have the ability to vary my "bite" instantly tho' ... with a simple push of a lever ... ;)

What is the skid length on your 8' wide unit ?

There's little doubt (in my mind anyways) that longer is better ... since length coincides with the direction of travel.
But there is also an issue - at least for me and my equipment - of weight past the pins on the 3PH ...


You can add the weight of the fel so with a bucket of dirt you would have about 3,000 lbs. If you have filled tires or wheel weights that would help too. When you drop the lpgs on the ground you can't add that as weight for traction purposes.

While you can raise the cutting edge to regain traction it isn't doing you much good at that point. I am still interested in your design though and hope it works out.

Both of my lpgs have 60" skids oal. Sorry I was mistaken and thought I had included that previously.

Weight is an issue for everyone but I don't see that being the problem for your 3ph at this point. The hitch can easily lift more implement than you can pull.

Consider this for a moment, when a 6' wide land plane is engaged with the ground it has two blades for a total of 12' of blade for drag.

I worked with my 8' lpgs all day and there were times that it was a hard pull. I am just trying to help with advice based on my experiences. Good luck with this and hope it turns great for you.
 
/ LPGS For Kubota B2910
  • Thread Starter
#92  
Sure do wish I could operate a computer to make pretty drawings like that.
All it takes is time and persistence ... and a high tolerance for software bugs, bad interfaces, and poorly designed (or non-existant) tools ... :laughing:

Got "sketchUp" downloaded, but too dumb to do anything with it:laughing:
I downloaded it most recently back in 2012 (SketchUp 8) ... of course, I never found any time to spend to sit down and learn it ... :rolleyes:

But I'm downloading the current version right now ... 'cause I really need some more hard drive clutter ...:laughing:
 
/ LPGS For Kubota B2910 #93  
My view on Sketchup when you first fire it up seems useless. BUT go watch and run thru the tutorial videos on how to use it which doesn't take long and suddenly it makes total sense and wow is it ever a great program!!! That's my thoughts on Sketchup. Take the time to learn it and you'll be happy you did.

E.
 
/ LPGS For Kubota B2910
  • Thread Starter
#94  
You can add the weight of the fel so with a bucket of dirt you would have about 3,000 lbs. If you have filled tires or wheel weights that would help too. When you drop the lpgs on the ground you can't add that as weight for traction purposes.

While you can raise the cutting edge to regain traction it isn't doing you much good at that point.
Scott (?) ... stop makin' so much sense will ya ?

... :laughing:

Unfortunately I don't have wheel weights or filled rears ... the B2910 doubles as our primary lawnmower and I wanted to keep a light footprint, figuring that I could add ballast as the particular tasks demanded it.

This is one instance where that logic has failed me.

I am still interested in your design though and hope it works out.
I do too ...

If I had a little more common sense - as well as patience - I probably would have held off for a bit and considered the dimensions a little more carefully before I started slicin' and dicin' ...

My primary consideration at the time was utilization of the materials I had (two 7' long pieces of 10" c-channel) and avoiding waste. Making the decision to go with 6' wide x 4' long (or 4' 6") allowed me to fully utilize the drops off the c-channel for the tailgate.

Truth is I had made the decision long ago to go with a 6' width ... and I had three drops (two 3" x 3" x 3/8" angles and one piece of 2" Schedule 80 pipe) from prior projects already cut to that length. Obviously it was a decision that wasn't all that well researched ... since I'm using none of those pieces in this build.

Both of my lpgs have 60" skids oal. Sorry I was mistaken and thought I had included that previously.
You may well have ... but I didn't go back and search this thread to find it while I was replying to your post.

These days my short-term memory is starting to suck a bit ...

Weight is an issue for everyone but I don't see that being the problem for your 3ph at this point. The hitch can easily lift more implement than you can pull.
Yup, probably true ...

My concrete ballast block (roughly 22" wide x 25" long x 29" tall)- which is awaiting modification to lighten it - weighs on the order of 1100 lbs and is mostly all behind the pins (especially considering the QH adds another 4" or so) ... and it will lift it ... barely ...

Consider this for a moment, when a 6' wide land plane is engaged with the ground it has two blades for a total of 12' of blade for drag.
Always with the good points ... :laughing:

It will be interesting to see how it operates as a practical matter ... given the design principles and features I'm incorporating into it.

As an example, if I were working terrain that was lumpy and fairly uneven, I'd think that I would be initially able to set the blades high and carve off the high spots. That would avoid having all of that 12' of cutting edge engaged at once.

Of course, at some point, all of it will be engaged ...

Hmmm ... that just got me thinking ...

I originally designed it for the blades/cutting edge carriers to pivot off the rear carrier ... wonder what the practical implications of using the front carrier as the pivot point would be ... ?

Gonna have to ponder that a bit ... :scratchchin:

I worked with my 8' lpgs all day and there were times that it was a hard pull. I am just trying to help with advice based on my experiences.
I know you are ... and it appears to me that you certainly do have some real-world experience, since from what I've read you appear to be doing this on a commercial basis.

So your comments about my tractor being able to pull it successfully are causing me some angst ...

But that's totally fine ... I'd rather have your candid input than not ... :thumbsup:

Good luck with this and hope it turns great for you.
Thanks ... I certainly do appreciate the thought - and the time and effort - you have expended to offer your advice/input.
 
/ LPGS For Kubota B2910
  • Thread Starter
#95  
Nevermind ... I already see a practical problem with changing the pivot point: raising the one blade would cause the other blade to do the reverse, due to the cutting edges being located on the front sides ...

Doh !
 
/ LPGS For Kubota B2910
  • Thread Starter
#96  
/ LPGS For Kubota B2910 #97  
Nevermind ... I already see a practical problem with changing the pivot point: raising the one blade would cause the other blade to do the reverse, due to the cutting edges being located on the front sides ...

Doh !

If you really want to pursue the hydraulic blade height it would be better to use four short pin joint levers as mounting points for the side mount carriers. This would allow you to raise and lower the blades keeping them level. Much like parallel bars on a fel. Some short pin joints with 4 to 6 inch pin to pin would be much stronger than what you have drawn. Set these mounting joints to be in tension not compression. I will try to sketch this up tonight for you.
 
/ LPGS For Kubota B2910 #98  
Maybe leave the blades rigidly attached to the frame sides, and raise/lower the skids below the sides?

Bruce
 
/ LPGS For Kubota B2910
  • Thread Starter
#99  
If you really want to pursue the hydraulic blade height it would be better to use four short pin joint levers as mounting points for the side mount carriers. This would allow you to raise and lower the blades keeping them level. Much like parallel bars on a fel. Some short pin joints with 4 to 6 inch pin to pin would be much stronger than what you have drawn. Set these mounting joints to be in tension not compression. I will try to sketch this up tonight for you.
Thanks, appreciate it.

I get the idea (of parallelism) ... but I'm not exactly following you on the actual mechanism.

Just got back from my steel suppliers from picking up the 2 1/2" square tube and the 2 1/2" x 3/8" flat. Fortunately I had enough presence of mind to grab 3' of 1" cold-roll solid while I was there for pins.

Maybe that would be suitable for what you're talking about ?

Anyways too nice outside to be inside so I'm going to see what kind of trouble I can get into outside ... :laughing:
 
/ LPGS For Kubota B2910
  • Thread Starter
#100  
Maybe leave the blades rigidly attached to the frame sides, and raise/lower the skids below the sides?

Bruce
Defacto the frame sides are the skids ...

(Edit: It occurs you may have meant the 3PH frame ... ?)
 
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