You have to know wich are the coils for each pair of wires.
Take a tester/ohmeter.
If the motor is for thre phashe voltage you only have to get the earth cable.
If the motor is only one phase you have two coils, one of this is start-coil and the other one is a work-coil.
In this case you've to...
Amphan.
I send you a little cuestions that probably help you.
1- begin easy.
¿It´s only one motor that have the problem?
in case "yes"- The other motors have the same grease???
Discard lubrication problem.
Check the geometric line between the motor and the pump ;and the torque adjust...