I just had a look and it looks like there is a line coming off the pump going to the rear remotes. We don't have a FEL. So we could put a divider right before it goes into the rear remotes. Have the one line set to go to the remotes and 3PH and the other one feeding the motor?
Now if we have 17GPM supply and i send 12GPM to the remotes and the rest to the motor, will we only ever have 12GPM available for the remotes, or if we are not running the motor would we get the oil its not using? My understanding is that the divider will split the flow, but what happens when one side isn't being used?
What about using a restrictor before the hydraulic motor?
Thanks for your help Dave.
Because of the risk of not fully understanding the hydraulic system on your tractor, I think you should be going back to your dealer, and armed with more knowledge, insist they provide you with a solution.
For example, you undoubtedly have power steering. It is the most critical hydraulic system as the loss of steering can be fatal.
Some tractors have two hydraulic pumps. One for the steering and the other for what you have on your tractor, rear remotes and 3 pt.
On the tractors with only one pump, the hydraulic flow does to a priority valve, not unlike a flow divider but more sophisticated. The priority valve reserves the first say 6 gpm of hydraulic flow that the steering system gets before anything else.
The second or even the biggest risk is somehow you unknowingly dead head the pump, i.e. block the output from the pump. Now you can destroy the pump. There is a relief valve and if you have been smart enough to have it between the pump and where you have inadvertently dead head the pump, it will save the pump for a little while but will overheat the hydraulic system and in the end again serious damage.
With the divider, both sides need a path to the tank or reservoir. On the side not being used, like any open center device, the unused flow is going back to the tank.
Two additional suggestions for your dealer.
1. Have him install a FEL valve as if you had a FEL. Now things are plumbed properly, relief valves are where they should be. In fact you will have two relief valves. One in the FEL valve and another for the 3 pt and rear remotes. With the FEL valve installed, you have the equivalent of two rear remotes from the work ports on the FEL valve. Use one set of work ports to provide a rear hydraulic circuit for the hydraulic fan motor. The hydraulic circuit coming from the FEL valve is ahead of the 3 pt so will have priority over the 3 pt and rear remotes.
2. Hydraulic accumulator.
Here on this topic my knowledge is much more theoretical than practical.
Start by watching this brief video.
Parker Bladder Accumulators - Tutorial - YouTube
If you have a water well, you likely have a diaphragm tank which is charged with air and eliminates frequent cycling of the well pump. The well pump forces water into the tank compressing the air above the diaphragm. When you next need water, the compressed air pushes water out of the tank for you to use. Depending upon the size of the tank, a lot of water can be supplied before the well pump has to start again. When first installed, the tank will have a bicycle tube style valve for injecting air above the diaphragm called pre-charging.
Hydraulic systems also use accumulators. They use them so a hydraulic pump does not have to be sized to meet the brief high flow needs of a hydraulic circuit thus saving money and operating energy.
This hydraulic accumulator is a lot stronger than the water well type because the pre-charge pressure, which will be nitrogen gas, will be several thousand psi, in the same range as the pressure in your hydraulic system. The accumulator would be sized to deliver hydraulic flow to the motor during the time when you are raising the 3 pt hitch which sounds like seconds.
A check valve would be installed between the accumulator and the tractor to prevent flow from going backwards instead of towards the hydraulic motor which needs it.
Kubota already uses a small version of a accumulator with a feature for FEL's called something like easy ride. The hydraulic circuit for the loader arms has an accumulator Tee'd off the lift circuit and lets the arms move a little and thus reduce the jarring on the tractor. Now if you are driving somewhere bumpy, the accumulator, acts like shock on a car.
Your dealer might have to consult a specialty hydraulic manufacturer to come up the the needed size for your application. If I am correct in the amount of time you are raising the 3 pt hitch, the accumulator will not be excessively large.
As I type, I really think the accumulator will turn out to be the easiest safest solution for your issue.
Hope the above makes sense.
Please don't forget to come back when done and provide an update to help us all learn.
Dave
M7040
