Is the speed constantly variable, or does it have a certain number of speed settings? And how many?
Very likely there is not different sets of windings for different speeds. More likely there is a resistor network sort of thing that attenuates the power to the motor, which obviously is incredibly inefficient. This is unless you do have a PWM controller built in. If you have only a few discrete steps in the power settings, then probably not PWM. A PWM controller would most likely use a 0-5v signal from a hall effect control or a potentiometer as input to tell it how much power to let into the motor, and so it would be constantly variable.
You should be able to find two wires that when hooked to a battery of proper voltage will cause the motor to rotate at full speed. Probably another two wires (one will probably be common to both directions) that causes the motor to run full power in reverse. If you isolate those wires, that is all you need. In fact, you only need the wires for full ahead. The external controller should be able to reverse polarity on the wires. Otherwise you would need to install a reversing contactor or something.
You may also have a fuse blown inside the motor housing, too. The upper unit, I imagine. So if it won't turn over, look for a fuse or CB.
Open up the top and have a look inside. Post a pic. Maybe it will tell us something. Also google for drawings, diagrams, etc for your unit. I am totall unfamiliar with that brand of motor.
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