3pt not lifting to full capactity

[Bob_Skurka]

Bob, the RPMs would affect speed, but should have little if any effect on lift capacity...

Dave, both of my current tractors have greater lift capacity on the 3pt when the engine is operating at higher RPMs. I've found this to be true especially when lifting heavy loads like pallets of landscaping stone. Some pallets cannot be lifted at all unless the engine RPS are up. Both of my compact tractors are made by different manufacturers (Kubota & New Holland) so I presumed (perhaps incorrectly) that the lift capacity is affected by engine RPMs, which in turn power the hydaulic system that operates the 3pt. I honestly can't recall lifting pallets with any of the antique Oliver or Ford tractors that I have used so I don't know if it is just my current brands that operate this way.

Consequently, based on experience with other brands, I feel it was reasonable to ask if the engine RPMs were sufficient to lift the load.

 

[DavesTractor]

Bob, I've actually seen the same thing in real world observations, so I understand what you mean. In theory, more flow won't make more power, but as a practical matter, I wonder if more flow will allow a little more lift before the pressure relief fully opens? Just like bumping the joystick will sometimes get you just a little more lift than just holding it open. By the way, I appreciate your posts, I just have to give you a little bit of a hard time, in good humor, once in a while.

 

[JerryG]

I wonder if more flow will allow a little more lift before the pressure relief fully opens?

That is the only thing that I can come up with also. It doesn't make any since. I have watched pressure gauges and after a few hundred RPMs, the pressure levels out and doesn't increase with more engine speed. The way the pressure acts on the relief is the only thing that makes since.

 

[Tim_in_IA]

Allan, a phd does not make use of the full 3ph linkage, rather removes the top link. This causes extreme pivot on lifting and limits capacity greatly.
Larry

The bale spear that I am using is an older vermeer with 2 spears. It only attaches to the bottom links and has stops and chains that exert the force against the bottom links. Would this have less capacity than a spear that utilized the top link? I didn't think so before since all the power comes from the bottom links, but if there is a lever action that happens this also might be contributing to the issue.

The 7520 loaner lifted the bales fine with the attachment but it has a rating almost 1000lbs higher.

 

[MtnViewRanch]

Tim, are you ready to buy that 7520 yet? That's one heck of a way to market their tractors.
Good luck with your repairs.

Brian

 

[Tim_in_IA]

I asked them for an uptrade quote but it will probably be too much for me. They make the backhoe rails for the 7520 now so I could bring my 511 over to the 7520. I'll have to see how it works out. If it is too much I might just look for a second tractor and pick up a large older field machine. I hear they can be found pretty reasonable.

Still no word on what the problem is but I am sure the 4th slowed people down a bit.

 

[BobG_in_VA]

Tim, Your 6500 isn't hardly broken in yet. Once they fix the hydraulics, you'll wonder why you even thought about getting the 7520 (except the engine in the 7520 is the 6000 engine with a small boost turbo---that is, I have somewhat of an affinity for the 6000....). Your thought about getting an older AG tractor is a good one. You live where there are a bunch of 656, 706, etc Internationals. Those things aren't gettin' good until they have 3000 hours on them. Find a well maintained 656, with less than 4000 hours for less than $5K and you're golden.... My $.02 worth. BobG in VA

 

[Tim_in_IA]

Just heard from the mechanic. He is going to pressure test the relief valve but he basically said the same thing about it being rated at the balls. I guess if it checks out I might try getting a different spear that uses the toplink and a higher pivot.

Somehow it has to lift them. They have pictures all over showing the 6500 lifting a round bale in the back.

 

[LAWALLSTRACTOR]

Tim

Did you try lifting the bales with the 7520? I am just curious about how that did at lifting the bales. You could probably modify your bale spear to use the standard 3 ph system. (Just a thought) I think that the 3ph system may well lift more than the 2ph will system. Good luck with it and let us know how it works out.

Galen LaWall
Your Mahindra Tractor Dealer
Batavia NY 14020
585-343-0770

 

[Tim_in_IA]

Galen,

Yes I did lift the bales with the 7520 no problem. It would probably be cheaper for me just to get a 3 link spear instead of modifying this one since the spears sit so low. They are spaced like forks would be but lean and pivot against the 3 point arms therefore not needing the toplink. Chains go over the bottom links to keep them from flipping up and whacking you and providing a little rigidity (if that's a word ).

The bales are out of a 510 John Deere round baler so I think the dimentions are 5' x 6'. Maybe that is too deep for the lift? Shouldn't be though.

I keep thinking of Mahindra's commercial today where they are picking up 2 tractors from competing brands with a mahindra. That is really selling me the message that this should be no problem lifting a bale. If that is not the case then I'd like a word with their advertising department.

On a good note though the 6500 ran the 510 baler great! It has a recommended hp of 70 but that is mostly for pulling with a full bale. The 4wd makes up for the 5hp difference in a pinch. I bought it before they stopped offering weights and dual remotes standard so I had the perfect setup. I let me dad run it since he used to have a 410 and he said it was a good fit.

I do notice that the 7520 is a little more fuel hungry so hopefully I can get the 6500 doing what I need it to do. It has been great so far.