How do I remove a stuck propeller?  (screw on props only)

Mud motors are built to run on or near the bottom.  As such, the propeller continually strikes objects.  The propeller is screwed on the drive and each time it hits a rock or log it becomes tighter.  So much so, that ordinary tools will not come close to removing the blade. Removing an over-tight propeller is actually very simple, all that is required is leverage.  Mud Buddy sells a prop wrench set that includes extended length handles that will loosen the most stubborn prop.  You can either get a set from Mud Buddy, or build your own. 

Insert a pipe wrench or crescent wrench into a 2 to 3 foot length of tube to hold the rear propeller nut.   Drill or punch a 3/4" hole in a 2 to 3' length of 1 1/4" flat bar for a simple, but effective prop wrench.

First remove the prop nuts and clean the threads with a wire brush. Coat with grease or oil. Place a pipe wrench of crescent wrench on the rear propeller nut.  Place the prop wrench between and blades and arrange booth tools like a pair of large shears. Pull the tools toward each other and the blade should loosen.  If not, heat the hub of the prop with a propane torch for about 3 minutes.  Do not heat the shaft, just the prop hub.  The blade should then come off.  If not add longer handles to the tools. 

Once you have removed the propeller, clean the threads with a wire brush and coat with marine waterproof grease or anti-seize compound.  When installing a new propeller, if the prop is difficult to screw on, remove and clean the shaft and prop threads again.  Good huntin'.