hydraulic motor hookup

[cowsrus]

Just wanted to check with someone who knows more about hydraulics than i do. I bought the digger part off of an old trencher at an auction and its powered by a hydraluic motor and i want to put a 3 pt hitch on it and use it behind my tractor.It's got two hydraulic connections on it. I'm thinking that you only have to hook up one of the hoses to the tractor and run the other hose into the tractors hydraulic reservior. Thats the way a post driver that i rented worked. Am i correct in my thinking?

 

[kennyd]

That will work for turning the motor only one-way. If you need to reverse the motor for any reason you can hook up both hoses to the rear remote-that is the best option IMHO.

 

[cowsrus]

What i was thinking that if you hooked up both hoses to the rear outlets on the tractor you wouldn't have a continuous flow through the pump and that it wouldn't turn unless you did.

 

[SPYDERLK]

That will work for turning the motor only one-way. If you need to reverse the motor for any reason you can hook up both hoses to the rear remote-that is the best option IMHO.

If you do hook up both hoses you will run some risk of motor damage when you stop the motor with the valve. This is because the valve ports will be blocked suddenly when the valve closes. The motor lines become isolated and the motor must stop instantly. If the motor is driving any significant inertial mass that inertia will try to keep the motor spinning as a deadheaded pump. Tremendous pressure will result causing damage. Special motor control valves, that allow flow in the motor lines to continue as the motor stops, are sold for this purpose. There are also relief valve sets that can be put in the motor lines to allow use of the std remote valves safely. Possibly, if your remotes have a float function you could just always switch to float when stopping to allow a graceful stop.
larry

 

[kennyd]

Not sure what "outlets" you have...Is there a lever that controls them? Are the "outlets" coupled together?

If it's a "rear remote", then there is a lever that sends fluid to the QD's (quick disconnects) with this lever you would have directional control of the motor.

If the two "outlets" are coupled together, then what you have is called a "power beyond" loop that has a continuous supply of oil in them whenever the tractor is running-it's used for implements like backhoes and logsplitters that have their own valves.

If you have the power beyond setup-then you will need a valve to control the motor anyway...

 

[kennyd]

If you do hook up both hoses you will run some risk of motor damage when you stop the motor with the valve. This is because the valve ports will be blocked suddenly when the valve closes. The motor lines become isolated and the motor must stop instantly. If the motor is driving any significant inertial mass that inertia will try to keep the motor spinning as a deadheaded pump. Tremendous pressure will result causing damage. Special motor control valves, that allow flow in the motor lines to continue as the motor stops, are sold for this purpose. There are also relief valve sets that can be put in the motor lines to allow use of the std remote valves safely. Possibly, if your remotes have a float function you could just always switch to float when stopping to allow a graceful stop.
larry

Yes, well aware of all that...he asked about a auger-they run slow so feathering the valve to off would suffice. But we are not even sure what setup he has just yet anyway.

 

[cowsrus]

I would be hooking to a standard rear hydraulic outlet used to power implements where the control levers operate one or the other outlet. I have a John Deere 4230 tractor or a International 886. Both are about 100 hp tractors

 

[cowsrus]

BTW-Its a trencher for digging a ditch i'm going to hook up.

 

[SPYDERLK]

Yes, well aware of all that...he asked about a auger-they run slow so feathering the valve to off would suffice. But we are not even sure what setup he has just yet anyway.

???
larry

 

[cowsrus]

To help clarify what i'm trying to do: The hyd motor has two hose connections on it and i was thinking that the fluid had to run through the motor in order to make it turn. If i hooked the two motor connectors to the two tractor remotes, i didn't think it would work that way. Will the motor turn if only hooked up to one of the outlets? I only need it to turn one way.