|
Faunsdale, AL | You should not usually have to remove the restricter orifice
I think there’s some other problem that’s allowing the pump output to bypass and return to tank.
How far is the agitation valve open? First check is to shut off agitation completely. If that doesn’t get you enough pressure, then check to see if closing the return valve back to tank results in over pressure. Will want to start with tractor idling and close valve slowly while watching pressure.
You should be able to cause the rate to go high since you will have preempted the controller’s ability to control the bypass flow. You can get an idea of how much output the pump has in relationship to the requirement.
If you cannot artificially cause high pressure/high rate by closing the return to tank, is the throttling valve shown on the schematic fully open?
Or possibly there could be a restriction in suction between tank and pump. Have heard of the lining of the suction hose sucking in at high flow rates.
Or you may need to turn pump faster so increase oil flow to motor as described above. First check is bypass screw all the way in tight.
Final question is the oil temp. You must return the flow from that hydraulic motor into the charge pump-filter circuit. Either plugged into the SCV, plugged into an added return coupler plumbed into the side of the SCV, into a power beyond block or into a ported filter cover, all will work. Stopping the flow using the float position is only important if you plug the return into the normal SCV coupler.
Another possibility is the controller is not responding to speed input. It may be set for a minimum flow rate to keep the nozzles from checking off and thst is all you can get out of it until it registers a speed. What controller does it use?
Edited by ccjersey 5/25/2025 09:05
| |
|
John Deere 4640 brand quick fold 80 pt sprayer hydraulic pump issues
