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closed center hydraulics

closed center hydraulics

closed center hydraulics

(OP)
i have a massey ferguson tractor that has closed center hydraulics that i am converting to an open center system, i have an open center pump mounted and working but i know that it will not last long pushing the fluid through so many relief valves. would like to know if a power steering pump from a chevy pickup or car works on a closed center system. if it would work i'd plumb one into the steering and brakes and everything else i have to finish conversion. any help would greatly be appreciated.

RE: closed center hydraulics

AFAIK, power steering pumps are all intended for open center systems.

 

Mike Halloran
Pembroke Pines, FL, USA

RE: closed center hydraulics

(OP)
do you know of any closed center pumps that i could run off a pulley to the front that would work?

RE: closed center hydraulics

Such things exist and are available from many sources.  They often come with an electric clutch so they can be driven by a belt.  Some come with two-groove clutches, so you can piggyback an open center pump alongside the closed center pump. ... which seems to be where you are going. ... I think.

Maybe it's time to put down the wrenches and the credit card, and complete the system design before you buy any more hardware.   

Mike Halloran
Pembroke Pines, FL, USA

RE: closed center hydraulics

(OP)
the best thing is i work at a trash company and i already have most of the valves and pumps that i need just every thing i have is open center. all i really need is a small pump to operate the steering and brakes.

RE: closed center hydraulics

You can make an 'open center pump' into a 'closed center pump' by adding an unloader valve to the pump outlet.  If the directional valves are not integrated into the pump meaning you have a bare pump.

Ted

RE: closed center hydraulics

(OP)
ive thought about that but was not sure it would work, have heard some say that it will build up too much heat
 

RE: closed center hydraulics

jimbomo, that's how a closed center system uses a fixed displacement pump.  The unloader valve directs pump flow back to tank at a low return pressure when the system demand is blocked.
The closed center system pump alternative is a variable displacement pump that is made to stop pumping when the system demand is blocked.

Ted

RE: closed center hydraulics

Put a cooler in the return to tank line so the unloader flow goes through it.  That will remove whatever heat the pump put in.

 

Mike Halloran
Pembroke Pines, FL, USA

RE: closed center hydraulics

Years ago I added an EXTRA power steering pump to a Ford pickup to run a small open center hydraulic circuit. We increased the reservoir capacity by welding another tube to the reservoir.  (We "borrowed" a second reservoir and welded two together).  

You should calcuate the volume required for implement cylinders and be sure the reservoir is large enough.

  I dont think it is a good idea to combine implement functions with steering and brakes.

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