Water has much more resistance than air, therefore slower prop speed. Are you sure there is a problem? Or possibly if their is a problem, weak battery, or corrosion. Clean battery terminals first, then try in water.
SOURCE: mINN kOTA 70 LB THRUST FOOT CONTROLLED TROLLING MOTOR
VONNY MY MOTOR DOES THE SAME THING AND I FOUND THAT THE DUST OF THE MAGNETS IN THE HEAD WAS CAUSING THE MOTOR TO STICK I CLEANED INSIDE WITH ELECTRICAL CLEANER AND IT STARTED TO WORK FINE BUT YOU MAY HAVE SOMETHING ELSE GOING ON AND ALSO MAY SURE YOU ARE NOT COVERED UNDER WARRANTY IF YOU JUST GOT THE BOAT
SOURCE: Trolling motor will not spin with out being turned by hand.
This may sound really dumb but it's worth a shot. I bought a trolling motor and it did the same thing as yours. I put up with it until I broke a prop blade. When I was changing the prop I discovered about fifty feet of monofilament fishing line wrapped around the shaft, partially melted, hidden by the prop hub. Once removed, it worked fine. Hey, try it, can't hurt.
SOURCE: Replacement of motorguide trolling motor prop
Motor Guide hubs come in two different sizes - 3" and 3.5". The 3" size is more for older and lower thrust models. Newer units use the 3.5. The size differences are between manufacturers too. MinnKota's are a little bigger. If you order a new prop, the only issue may be the depth of the prop. I had to use a longer prop nut wrench to tighten the Hydrilla Hacker I purchased.
Triton72
SOURCE: minnkota trolling motor prop removal
remove the nut and the prop will come right off. Just be careful not to loose the shear pin.
SOURCE: Minn Kota Maxxum Trolling Motor
I had the same problems with my 70lb, my motor just quit while on the lake, took it to a minn kota service repair shop. I had two issues. One was the little magnet under the button on the foot pedal got recessed to far down, the tech told me if it happened again pop the button off and pull the magnet up some. Simple fix. I took it home put it back on the boat and nothing just a slight ticking noise heard from the pedal with no prop movement. So I thought maybe somethin was wrong with one of my batteries. Unhooked everything, tested both of them, all good. Even though there was hardly any corrosion, I clean everything, hooked it up and "WALLA"! Power! Problem solved, for now. Waitng to test again out on the lake
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