Medium Duty Mobile Piston Pump, 4.21 cu in/rev, 2-4-Bolt SAE C Mounting Flange, 14T SAE C Splined Shaft, Pressure Compensated Load Sense Control, Compact|Lighweight, durable aluminum construction|Numerous shaft options|Tandem capability

Counter clockwise is the correct rotation for this pump, so yes, the drive direction has to match. Running it backwards won't build pressure the right way and can cause internal damage pretty quick. Before you bolt it up, confirm which way your PTO or drive shaft turns when viewed from the shaft end of the pump. If your setup runs clockwise, you'd need a different pump spec'd for CW rotation. This one is strictly CCW.

This Cessna pump has a counter-clockwise rotation, as specified. To ensure it's the right fit for your log splitter, verify that the 4.21 cu in/rev displacement, 2-4-Bolt SAE C mounting, and 14T SAE C splined shaft match your requirements. Also, this unit has side ports with a 2 Inch Code 61 Flange Inlet and a 1 Inch Code 61 Flange Outlet.