Thanks for your message Elektrodrive. Motor has been overhauled correctly. This was confirmed twice. No errors codes are present. We have not calibrated the throttle pot, but not sure if this is causing the problem.
We exchanged Pump Controller with Traction Controller, and Traction motor works perfectly, but Pump motor works slowly just as it did with the Traction motor. We tried the Traction controller in another EPX25 and it works perfectly, so we are disregarding a problem with the controller itself.
We really have no idea what is wrong!!!