Animal

Well-known Member
What should the oil pressure be coming out of the hydraulic pump at idle? This one is just putting out a small amount from the allen head plug at the front of the pump, I kind of thought it should be a gusher.
 
Pressure/flow at the pump will depend upon control system (among other things).

You will need to induce a hydraulic load, e.g., dead head a remote valve or lift a heavy load on the three point, to create pressure.

Dean
 
Low till you demand power then up to around 2000PSI give or take a bit. On a hyd system there is little to no pressure tile you demand it to work then it can go to max till what your using has reached as far as it goes then depend on how the circuit is set up
 
Pressure at pump will be minimal (unmeasureable with 2000 psi gauge) until a hydraulic load is established.

Dean
 
The pump should have a maximum flow of 4 gallons a minute. It will not have this kind of flow at a idle as the flow increases with more RPM's
The pump should be able to build pressure of more than 2000 lbs. The system is kept at below 2000 lbs by the relief valve.

The problem with checking the system is that it is a constant flow system.
The pump never builds pressure because the system is open ended in the lift cover area.
Operating the system shuts off this open end and directs the oil to lift the 3 point.
The system will only build enough pressure to lift the arms.
The more weight on the arms the more pressure it needs.
So there is no way for us to tell you what pressure you should have as it is a constant variable based on weight lifted and if you are lifting at that precise moment.

There are detailed procedures to follow in the Ford shop manual that tells you how to plug off the open ended system to see if the pump will build enough pressure to pop the relief valve and how to check oil flow at higher RPM's without spraying oil everywhere.
If you suspect problems I suggest you get a copy of the manual.

By the way that plug you took out is used to check pump prime.
 
You got some really good responses here. Pay attention to them.

You said very little oil was coming out with the primer plug removed from the pump. If that is with the tractor running, something is wrong. One good way to check pump priming problems is to connect some clear plastic tubing from the primer plug hole back to the sump fill opening under the seat. I think you need a 3/8" male NPT to hose barb fitting. Start the tractor and set it at idle. Oil should be circulating through the clear tubing. It should be a good flow. You should not see bubbles in the oil flowing through the clear tube. This can really aid in troubleshooting.

This is a quick easy check to try before digging into repairs.

BTW, when you do this, the lift will not work. You will have to put the plug back in.
 

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