What size hydraulic motor do I need?

Hello everyone...new here. Hope someone can help me out here. Don't know if I am posting this in the right forum but here goes....I've got an old auger setup for a Parker wagon that we used for fertilizer years ago. I had a new auger with bristle flighting installed to use for bean seed and the one time I used it on " Non Roundup" seed, the motor turned so slow that it took forever to fill the planter. Using a Farmall 806 D for the hydraulic power and I believe it is rated at 8 gallon per minute. Now I don't know if you have to have the tractor up to pto speed to get that gallonage. I sure wouldn't think you would need all those rpm's to turn a 4-4 1/2 " auger with bean seed. can someone help me out and tell me what size hydraulic motor I need to couple to this small auger to get the speed I need to shorten my fill time?
 
1st... Welcome! I have to ask a few questions. The Killbros that I have has a lever on the motor that regulates the flow of hydraulic. Check & see if Yours has some form of regulator; if you don't know. Also is the PTO pump 540, or 1000 rpm? Is the pump new, or 50 years old? I don't know about the 806; but assume its hydraulic fluid. JD (or somebody) made (or had) PTO pumps in the 50's that I believe were 30 weight motor oil. Just like the hydraulics on the JD 2 cylinder tractors. That could be a problem, if using a different oil!

The bad thing I have to tell You is my KB is a 6" 14' auger that a JD 60 with 4 GPM using the onboard hydraulics can operate, & can run it at several hundred RPM under load! I could fill a 6 row JD 7200 (1650 lbs.) in easily under 10 minutes from tire stop to tire rolling. That 806 ought to blow a lot more fluid no matter how You put it, & leave that 60 of mine in the dust. Long story short... I think if You cant find something that regulates the flow; then You have a auger pump problem. I cant say for sure as I have not had problems with mine! Knock on Wood!
 
I assume you have a Charr-Lynn motor? They are
pretty good with tech help, I would give them a
shout. Barring that you need to find the motor
information and go on line and find one with less
displacement. Given the same amount of oil feeding
them a motor of one half the current displacement
will give twice the RPM but it will also have one
half the torque of your current motor.
 
I might add that I agree with Derre Scotty. Our old fertilizer auger will spin REAL fast when the lever is moved to the fast position, this was on a 656.
 
You also need to determine at what RPM you want to run the tractor when you run the auger. You should also have the model of the motor handy. Also remember the hydraulic motor is not 100% efficient either. Did you buy a new orbit motor or was this on the old auger?
 

I'm not certain of the numbers but this is what tractordata posted for 806 hydraulic capacity at rated rpms. Or what a pto pump is ? Is there 2 or 3 pumps?
10gpm at 2000psi should make approx 9HP on the shaft of a hydraulic motor.

Pump flow: 12 gpm [45.4 lpm]
3 gpm [11.4 lpm] (PTO pump)
Total flow: 24 gpm [90.8 lpm]
Steering flow: 9 gpm [34.1 lpm
 
You need to know the variables, speed, flow, pressure, then go to
Surpluscenter.com's hydraulic formula page, and do some math.
 
OK...so here is what I"ve got...A hydraulic motor with absolutely no identification whatsoever. No name plates, no numbers or names in any of the castings, no nothing. All I can tell you is it is a standard four bolt mount with a 1" shaft w/woodruff key slot. I had it hooked up to my 806 and with the tractor engine running around 1250 rpm, the motor was running at 80 rpm. I don"t know how this all figures out, but I know I need a faster motor. This is running a 4-4 1/2" bristle auger that is about 12 foot in length. Motor is directly coupled to the auger. I went to the SurplusCenters website, but I can"t figure it all out without knowing the displacement and the gph at the speed I am running.
 
Well that IH 806 might just have a bad hydraulic pump. Neighbors tried to use my fertilizer wagon years ago with a IH 686 and they had to run the tractor wide open to get the auger to run very well.

Hook your auger to a different tractor. That way you can tell if you have a motor issue or a tractor issue.

Truthfully the older tractors do not run hydraulic motors the best. That 806 is rated at 12 GPM on the SCVs when brand new at full throttle. So at 1200 RPM, with wear and some leaks you could easily only have 4-5 GPM for the hydraulic motor.

If you go to a smaller displacement motor it will run faster but it may not have the torque to turn the auger when it is full.

I would suspect the tractor hydraulics are feeble. The older IH tractors where not the best for SCV operations with age/leaks/wear.
 
can't help on the motor issue, but I can clarify on the 806: the MCV pump is rated at 9 GPM and supplies the steering, brakes, TA, cooling, and lubrication. The hitch pump is most commonly a 12 GPM unit although a 17 GPM was available and supplies hitch and remotes. The pto has its own pump that draws directly from the reservoir and supplies only the pto clutches. this is all at pto speed, 2100 rpm. the hitch pump system originally had a 1600 psi pilot relief valve, although they sometimes get changed out for 2000 psi units- it's a hex head on the outside of the RH seat support and is generally stamped with the pressure.
 
Char-Lynn has charts available, that you measure
the thickness/width of the gear rotor/gear roller
and it tells the displacement of the motor. From
that, knowing Gallons per minute of the pump,you
can calculate motor RPM, and calculate torque,
or power if you know pressure. However, specs,
from an owners manual are one thing..to know
actual GPM and Pressure, you need to put a flow
meter on the tractor.
 

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