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IIRR,
shims are no more than small washers. I believe there is a chart either from sundstrand or in the cub manual,(or both) that give poundage increase per thousands of thickness, for the implement relief valve. A pressure gauge and assorted shims/washers will get you there easily.:beerchug: |
You will need a washer 1/4" od. Sometimes they are hard to find.
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Yes I did use the post reservoir and went a little oversized on the suction and pressure line to the valve just for more fluid. the suction side I used 3/4" and 1/2" for the pressure side. As far as the drive for the pump I used the front electric PTO originally on the 1450, so I can turn it on and off when not in use. I used a 5" sheave on the pump to match the one on the PTO. That way I did not have to worry about to fast a rotation on the pump.
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Thanks for the tips about the washers, my implement valve didn't have any shims in it when I took it apart. I was able to get 3mm washers from Menards that fit perfectly, it took about 4 of them to get it shimmed to 850-900PSI. This made a huge difference with responsiveness of the loader, it now will pick up the front end and will lift 200lbs with no struggle. I'm not sure what the capacity is now but it doesn't hesitate with 200ish like it did before. This is great.
I am assuming there is more performance to be had with an individual pump. This might be enough for me as is, I am going to use it as is for now and see if it leaves me wanting more. I am still a little leery about shimming the pump this much, maybe I need to do more research on the pump to settle my nerves but everything else in life seems to have consequences when they are pushed outside specs. I feel like I am feeding a gas engine nos or alcohol sure its fun and great now but how long do I have :biggrin2: Sparky40- thanks for all the pictures and the information, if/when I decide I want more power or don't want to abuse the existing pump I will probably use the same set up you have. I like the larger hoses for capacity tip! |
Well, if you will listen to me, your nerves will be fine. This is the last time I am going to say this..... the super garden tractors (like the 982) use THE SAME PUMP and the implement relief pressure is set to 700-900 PSI.
To back up my advice, I have been a heavy equipment tech for 20 years, with vast hydraulic experience. I know that pump well, and I'm certain you are still well under its limit. As far as advantages to a seperate pump.... Maybe more flow if you get one with a larger GPM, but then you will only be able to push "X" amount of fluid through the hoses and valve.... so you may not gain enough to justify the cost. I had the GPM of the rear pump figured, and posted it here before, but can't recall the GPM. Sticks in my mind it's around 5 GPM at WOT. |
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Here are some pictures in action. Someone feel free to chime in how to rotate images.
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Here is a snipit from the Sunstrand manual with the specs for the hydro.
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