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Discussion Starter · #1 ·
`94 4020PS # 14184109
HAS ANYBODY ACTUALLY DONE THIS ?
Sometime ago on an unnamed forum I inquired if the 3pt with sleeve hitch adaptor could be used as a built in jack to raise the tractor for maintenance. Answer was "yes". Tried it last night to sharpen blades and clean the underside of the deck. Raised 3 pt, placed jackstands, lowered 3 pt, no go. No squeal, no stall, but will not pick up the machine. ( Tires loaded w Rimguard and plastic weights) Was hoping to use the back blade next month for a project. ( have no other rear mnt attachments) The 3 pt seems to function properly and I use it to tilt/dump a 4' x 6' trailer. Did I just exceed the capacity or do I need to investigate this further ? I do not have a selector valve. Exhibits no other hyd symptoms or weakness, actually, it tows like a locomotive and with the shorter gearing of the later models will :mowlawn: quite happily in high range.
Thanks for your input
 

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Remember that it takes awhile for both the 3 pt and mower lift cylinders to get in synch when operating without a selector valve so when you move the 3 pt up or down it won't have any power until the other cylinder moves too. You should be able to look and easily see if the 3 pt cylinder is retracting fully (moving the 3 pt down). Some of the 3 pts have a "float" feature (much like that on the mower lift links) where the 3 pt can move up and down a bit without the cylinder moving.

Personally, I've never used the 3 pt for the purpose of lifting the rear end and wouldn't want to be crawling underneath with the tractor supported just by the 3 pt. I use one of the fancy floor jacks that HF sells for about $20. :sidelaugh:
 

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Discussion Starter · #3 ·
Bart said:
Personally, I've never used the 3 pt for the purpose of lifting the rear end and wouldn't want to be crawling underneath with the tractor supported just by the 3 pt. I use one of the fancy floor jacks that HF sells for about $20. :sidelaugh:
Agreed, had it worked I would have placed a second set of stands under the axle prior to sticking my melon under the deck.
I have two large floor jacks that I ordinarily use for this work, guess I was trying the lazy man option, that and plain curiosity. Might also be helpful "out in the field".

I suppose I`ll just retreive my back blade from storage and give it a shot.

Thanks :wave:
 

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Discussion Starter · #5 ·
kcunningham said:
The older 3pt hitches used a cylinder that was single acting. If yours is the older type, then you will not get down pressure.
It`s the newer style w the cyl on the right ( HH34?) It`s on the dealer invoice from back in `95
IIRC it`s a dbl acting cyl w 2 lines
I believe it has downpressure, just not enough to lift the tractor.
I will look into it again tonight.

Thanks to all for the replies
 

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Discussion Starter · #6 ·
FWIW, the answer is: Yes & No

Removed the filled turfs and installed the empty Ags and plastic weights, the 3 pt will now raise the tires approx 3" off the floor, albeit s-l-o-w-l-y. Runs out of hyd power far before it uses all the cylinder travel.
Useless info, but I was rather curious. Thinking that if I ever got mired in mud I could raise the rear and place some handy piece of debris under the tires.
 

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I would check the implement relief pressure. I've had 3 different 3pt equipped tractors. two would lift the tractor effortlessly, one wouldn't and it's pressure relief was only 425 or so.
 

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The same hitch is used on the loaders but the line pressure is higher when dedicated to the 3 pt. If you never use the center lift cylinder then you could probably crank up the pressure a bit but you would be risking damage to the center lift mechanism if you used it for lifting attachments with the relief set too high.
 

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My tractors with HH34's can handily lift the back off the ground with filled lugs and cast iron weights on. Running an aerator through hard pack at the wrong angle and it will include lifting it with my person in the seat ...

Relief pressure would be suspect, but you might also have air trapped out at the cylinder, making it weaker than normal.

Brian
 
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