It is just held with set screws. I tightened them up enough to create a mark on the shaft and then removed them and ground a flat spot on the shaft where the marks were.
Once the tractor is warmed up no amount of load has really bogged down the motor so I don't believe there is much torque to deal with. Basically you will probably be using only about 20% (wild guess,LOL) of the pressure that these pumps are capable of producing.
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