Danfoss / Eaton Cessna Gear Pump

Reversing the rotation on this pump is meant to be done in the field without sending it out for rework. No special tooling is required for the direction change itself. That reversibility is built into the design, so it's a matter of following the correct disassembly and reassembly steps rather than sourcing additional components. Worth noting that the minimum working temperature is rated at -20 degrees, so if you're running it in cold conditions, give the fluid time to warm up before putting the pump under full load.