If I remember right that's a threaded shaft so it's on to the right and off to the left.
but they can be a pain to get off, so apply some heat to the impeller close to the shaft, this will cause the impeller to expand an ease in its removal, the trick is to not heat the shaft and work quickly, use a wood block and a big hammer to hit on veins close to the hub and alternate frequently between them.
Jay the pool pump motor repair guy in longwood Florida'
if'n yer local bring it by and I will give you a hand.
Jay
https://www.partswarehouse.com/Homelite-RTP3-Trash-Pump-UT-01577-s/13044.htm
SOURCE: How do you remove the impeller on a honda wt40x
The impeller is threaded onto the crankshaft. Pull the spark plug wire then turn the motor until you are coming up on the compression stroke and the vanes of the impeller are mostly vertical. At about two o'clock on the pump bell there should be a port so you can put a metal rod through it, resting it against one of the vanes at the top of the impeller. Go to http://powerequipment.honda.com/pumps/models/wt40 and about half way down the page it shows the "Easy quick cleanout port" feature. This is how you should be set up to turn the impeller counter-clockwise to turn it off. The use of a dead blow hammer or one similar to the one in the Honda picture is recommended as the impeller is cast and a steel hammer may cause the impeller to crack. Put the new one on tight but don't worry about overdoing it, the motor spins in a self tightening direction so it'll get tighter with use.
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