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Faunsdale, AL | Don’t know what type pump that tractor has, but An open center tractor hydraulic system frequently isn’t ideal for hydraulic motors.
It can be great though. The problem is because of a mismatch between the pressure and flow tequirement through the motor and the output of the tractor hydraulic pump. Any excess flow has to go somewhere and usually that’s through the high pressure relief on the system. Any excess pressure just adds heat to the oil.
Most hydraulic drive spray pump will have a diverter valve to bypass oil around the motor so there’s less that has to go through the system relief valve. This must be opened if you want to use the pump on an open center system.
On the other hand, Restricter orifices are used on some pumps for closed center tractors and removing them
May…MAY allow the motor to run with a lower system pressure (less hp/heat input).
Most important, on a closed center system, if there’s any flow going through the high pressure relief, that means that the whole output volume of the pump is being raised to the relief pressure setting which maximizes the amount of hp/heat put into it. Much better to use a large enough flow divider to allow the excess flow to bypass and limit the pressure developed to only as much as is required for the motor operation.
Restrictor orifices are not helpful when you’re trying to reduce the operating pressure because they’re sized for a closed center pump that builds up to a standby pressure anyway (at least the old pressure compensated ones did.
Modern flow compensated pumps don’t have either problem and should not be creating excess heat. | |
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Hypro Pump
