Don't just go by a reading from a temperature gun. The pump will run warm if it's hot outside. The oil is always cooler than the outside temperature.
There are 2 things that could be going on here. One, running the tractor RPMs too low can result in the pump dropping into low pressure standby mode, which is in the 600 to 900 PSI range versus operating is usually in the mid 2000’s - 2500 PSI area which is where our pumps are theoretically set up from the factory when they're tested and quality checked. Second, is the pump being overloaded? How many hydraulic functions have you moved over to the pump? If it's been overloaded, the pump will stay in low pressure mode and will not spool up into high pressure mode that will run things properly. You may need to move a function back to the tractor hydraulics.
The first thing you will need to check is...did the planter previously have a pump system installed that was a gear pump? These will often have an internal bypass somewhere on the planter like valve bodies, control blocks that the functions run through that's tied to the monitor, the control system in the cab of the tractor. They typically have an internal bypass that allows the excess oil to return to the tank and if that's left open, it will interfere with the operation of our pressure compensating pump. You will need to modify the valving to be the same as if the planter was being run from the tractor hydraulics.
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