Legacy/K92 hydraulic psi increase - done! - MyTractorForum.com - The Friendliest Tractor Forum and Best Place for Tractor Information
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post #1 of 76 Old 12-08-2008, 09:56 PM Thread Starter
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Legacy/K92 hydraulic psi increase - done!

We've discussed it in other threads; now I made good on my threat and increased the psi on the implement relief valve by adding shims. Not a difficult task at all - took about two hours. Here is what I did.

But first *** Disclaimer *** This is something I have done to my machine at my own will. It is above the design spec although informally, a tuff-torq engineer said it would be fine, and others have also done the upgrade. I accept the risk that something may fail on my machine. Do this at your own risk. ****

Pic #1 is the patient.
#2 are the shims I got from McMaster
#3 is the pre-shim psi at a front quick-connect
#4 take off the fender and be greeted by lots of dirt.

...To be continued
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2005 Legacy XL diesel subcompact w/Loader, Backhoe, 60" deck, DR 3-pt logsplitter, Leinbach 7200Jr Post Hole Digger w/ 12" auger
1984 Allis Chalmers 912H
1951 Farmall Cub w/54" snow/grader blade
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post #2 of 76 Old 12-08-2008, 10:06 PM Thread Starter
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Re: Legacy/K92 hydraulic psi increase - done!

#5 remove the tank and some more brackets to reveal a crud-covered tranny
#6 a quick cleanup and you can see the center valve block. The relief valve is the hex-head between the two check valves. Be very careful to clean the crud from around the valve when removing.
#7 This is the relief valve plunger assembly. It unscrews rather easily
#8 separate the components, and you get the hex nut, o-ring, washer, shim. The K92 spec sheet shows two shims by default; I only had one. The shim to insert is above the center washer.

...to be continued
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2005 Legacy XL diesel subcompact w/Loader, Backhoe, 60" deck, DR 3-pt logsplitter, Leinbach 7200Jr Post Hole Digger w/ 12" auger
1984 Allis Chalmers 912H
1951 Farmall Cub w/54" snow/grader blade
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post #3 of 76 Old 12-08-2008, 10:20 PM Thread Starter
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Re: Legacy/K92 hydraulic psi increase - done!

and the results:

#9 psi increased to 1150 with one .5mm shim
#10 psi increased to 1300 with two .5mm shims.
#11 is the exploded diagram of the valve block. K through R is where the action is.

I put it all back together and didn't have any bolts left over.

Initial test:

It was dark so I could not go crazy with testing. But I can lift the front of the tractor without issue (couldn't do that before), steering is noticeably easier even with weight in the bucket, and the few scoops I took in the mulch pile were obviously more powerful. Watch this space for more updates.
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2005 Legacy XL diesel subcompact w/Loader, Backhoe, 60" deck, DR 3-pt logsplitter, Leinbach 7200Jr Post Hole Digger w/ 12" auger
1984 Allis Chalmers 912H
1951 Farmall Cub w/54" snow/grader blade
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post #4 of 76 Old 12-09-2008, 07:22 AM
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Re: Legacy/K92 hydraulic psi increase - done!

So is this the shim that you are talking about and the place you added more???


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post #5 of 76 Old 12-09-2008, 09:36 AM Thread Starter
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Re: Legacy/K92 hydraulic psi increase - done!

The gold one is just a washer; the shim is to the right. Yes, that is where I added them. The valve is located just below seat. If not for the free-wheeling lever you could make this change just by lifting the seat.

2005 Legacy XL diesel subcompact w/Loader, Backhoe, 60" deck, DR 3-pt logsplitter, Leinbach 7200Jr Post Hole Digger w/ 12" auger
1984 Allis Chalmers 912H
1951 Farmall Cub w/54" snow/grader blade
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post #6 of 76 Old 12-09-2008, 09:48 AM
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Re: Legacy/K92 hydraulic psi increase - done!

randyny:

Thanks for the project review and great photos. Very well done.

Rodney
John Deere 2305 TLB
John Deere X540 GT
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post #7 of 76 Old 12-09-2008, 06:22 PM
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Re: Legacy/K92 hydraulic psi increase - done!

well done! good pics. having read your previous posts (I notice you work that thing hard), I predict you'll be very happy with the improvement.
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post #8 of 76 Old 12-09-2008, 06:34 PM
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Re: Legacy/K92 hydraulic psi increase - done!

Nice!!!

SIMPLICITY
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post #9 of 76 Old 12-10-2008, 07:51 AM
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Re: Legacy/K92 hydraulic psi increase - done!

That's one "Class A" description. This thread should go into the shop manual!
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post #10 of 76 Old 12-10-2008, 04:43 PM
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Re: Legacy/K92 hydraulic psi increase - done!

WOW!!!! Great story and presentation Randy. Would scare the crap out of me if I had mine in that many pieces.
And what do you do in your spare time?
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post #11 of 76 Old 12-10-2008, 06:45 PM
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Re: Legacy/K92 hydraulic psi increase - done!

Randy,

Great post! Please let us know how much more responsive the hydraulics are.

Cheers

JDFANATIC
JD2210, loaded tires, 62C MMM, 210 Loader, 47" Snowblower, York Rake, PTO Spreader, Heated Cab, JD Plug Aerator, FIMCO Sprayer, Wheel Spacers, FEMCO Folding ROPS, JD Cart, Stihl MS170 and HT101, Wallenstein BX32 PTO Chipper

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post #12 of 76 Old 12-10-2008, 10:17 PM Thread Starter
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Re: Legacy/K92 hydraulic psi increase - done!

Thank you fellas. If I had known how easy it was I would have done some time ago.

Some more playing around yesterday. Basically it has become much more powerful. It either lifts what I ask it to, or it lifts the back end trying. One day I will get enough bags of weight so I can measure capacity. When I first got it, I measured 540 pounds to full height, although it took a looong time to get there. Which brings up another operational nicety. It operates more like I would expect hydraulics to operate; heavy loads lift at a normal speed now.

This has also got me wondering about the physics behind this charge pump design. To get to max pressure, whether the default 1000psi or the upgraded 1300psi I had to hold the joystick for a few seconds while it built the pressure. Contrast that to the PTO pump for the logsplitter - when that ram hits an immovable object the relief valve kicks in immediately. So this gives me a margin of error - if I attempt to lift a too-heavy load, it won't reach 1300psi for a few seconds, allowing me to rejudge to attempt while easing the ultimate load on the hydraulics. That's my theory anyway....

I don't imagine I will be maxing this out all that much but it is nice to be able to lift up mulch from the bottom of the pile.

2005 Legacy XL diesel subcompact w/Loader, Backhoe, 60" deck, DR 3-pt logsplitter, Leinbach 7200Jr Post Hole Digger w/ 12" auger
1984 Allis Chalmers 912H
1951 Farmall Cub w/54" snow/grader blade
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post #13 of 76 Old 12-15-2008, 11:54 AM
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Re: Legacy/K92 hydraulic psi increase - done!

Did you have to tear it apart that much?
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post #14 of 76 Old 12-17-2008, 03:34 PM Thread Starter
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Re: Legacy/K92 hydraulic psi increase - done!

Yes, what you see in the pics is necessary. It is very simple though. Took two hours the first time I did it. I could do it now in half that. No special tools needed either.

2005 Legacy XL diesel subcompact w/Loader, Backhoe, 60" deck, DR 3-pt logsplitter, Leinbach 7200Jr Post Hole Digger w/ 12" auger
1984 Allis Chalmers 912H
1951 Farmall Cub w/54" snow/grader blade
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post #15 of 76 Old 03-28-2009, 09:12 AM
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Re: Legacy/K92 hydraulic psi increase - done!

Randy, did this mod increase the speed of the hyd as well? If not, is there anything that can be done to make the bucket respond a little quicker?


2007 Legacy XL diesel 54" deck w/mulcher, front loader, custom rear draw bar and more impliments to come.
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