Help in building/plumbing lime spreader...

I am in need of some good advice on plumbing a project..
I am building a tow behind lime spreader, '74 IH dually dump chassis, v-box with horizontal feed auger and spinner..hooked to tractor hydraulics ( open port..not valved from tractor)..
Ive attached a schematic of what I think I may need....not sure..
I have the auger/motor and will get the spinner setup ...both will be hydraulic motors...
Can I use the flow valves like I've drawn ??
Can I route two returns teed into one back to the tractor ??
Or what do I need to do to plumb this up??
Also not sure how wide one spinner will spread...may need two...

I just need sound answers...buying one is out of the question...I have most of the material here.....and I need to get the lime spread in spring....some ground is too rough/steep for a truck and want to do it at my convenience...not rely on others...no renting ect....

Thanks for any replies
Dave

[/img]

Looks to me like it should work assuming the spinner is on the bypass port not the adjustable. Myself, I would go with separate return lines. My reason for this is the pressure difference. Could it result in back pressure on one of the pumps causing poor control or possible damage?

Not trying to throw a wrench into the works here. But what kind of a tractor ya planing on using . Now as for myself i think that i would install a hyd pump on the spreader along with a good sized tank and run a pto shaft to the pump . This way you could size the pump to your needs . Now if you are going to be using a newer tractor that has lots of hyd. volume and pressure then it should work fine . But for older tractors that have limited pump output you may run into some problems.. Just my thoughts here.

I was planning on using my 560 ...It needs a new pump so Im going to put a 17 gpm pump in it....would that still not be enough for two hyd motors??
I had thought of a pto driven pump on the spreader but thought the tractor pump may work saving buying a pump and making a resevoir...I have some shafts.....
My thought with hyd drive is that it will be easier to calibrate what application rate I want ....originally thought of ground drive but would have to keep changing sprockets to get what I want rather than turning a valve...plus I have the motor/auger setup....
Thanks for the replies so far
Dave

Well yes you can replace the 12 GPM pump with a 17 GPM pump BUT the problem is that the filter on a stock 560 is only made to handle 14 GPM when clean and this will give ya fits . That is why i was saying that a PTO driven pump would be a better chose that way you could go with lts say a 25 GPM pump or larger and us a filter inline that could handle atleast 30-35 GPM flow then make up a holding tank that held 25 to 30 gallon along with a oil cooler as that oil will get hot . This is something else to think about as a 460-560 tractor does not have a hyd.oil cooler And running a 17 gallon pump and only 16 gal. of hyd. oil the oil will heat and no way to cool it and two hyd. motors will heat the oil fast . Now this is just my thoughts here . Back when 560's were built there was not much use of hyd .motors and there was not the need for a lot of hdy. flow . Now today with more use of hyd.'s the newer tractors have larger hdy. capacity and flow along with higher pressures .The 560 area tractors did well with the 1200-1500 lb. range lifting implements and got along fine. Now here we are today and every once in a while some one will come on here and ask why there older tractor will not lift some pice of equipment and this is because first off that 1200-1500 lbs if the system is up to it's standards is 500 to a 1000 lbs . of pressure light or it will raise it slowly because the system does not have the flow . Over the years of working on tractors i have many times replaced the relief valves on 06's and thru the 66 series from the 1750 relief to the 2350 relief so that that tractor could raise something . I know that when my buddy and i wrap silage bales that his brother's Oil ALL OVERSwill wrap about 15 to 20 bales ok but with there limited oil capacity the oil starts to heat and things slow down because of the heat .But when we put the wrapper on my 806 because of the fact that the 806 has about more oil in reserve plus a bigger oil cooler we can wrap bales from sun up till way past sun down and never get the oil any hotter then around 160-170 degrees well with in the working range .Plus it will wrap bales twice as fast as the OIL ALL OVER . Your barn yard engineering is great but just needs a little tweaking.

Thanks a lot for the reply...
I still plan on putting a new pump on the tractor due to the fact I bought a 2250 loader this winter....
I had problems with it last year lifting the plows and discs after the oil got hot...

I think I will go the pto driven pump route...too bad I got rid of one last fall when I traded a dozer pump with cylinder and resevoir
...thought I would never use that again..hmm dummy me....

I'll update this topic when I get it put together....trying to think of other uses for the pto pump rather than just tied up to the lime spreader....
The 2250 loader came with its own spool valve so I was
going to put in a priority valve before the hyd block on my 560 to plug the loader into and use the tractor pump ...the loader is a quck mount ...
Thanks again
Dave