[jnaas2]

The 4 bolts if they screw into pump body the housing will get bigger where it bolts onto the motor take a flashlight and look inside the slots and thats where the coupler is located. The older ones have two half moon shapes that are held onto the motor shaft and the pump shaft by allen screws and they are connected by 4 springs that way when the motor kicks on the springs absorb the impact. Usually the springs break and you loosen the allen screws and unbolt the motor, dont remove the impellor housing because there is a small gasket that will be damaged if you do. Normally if the bearings are going out it will start to leak water, after the motor is removed try to move the shafts from side to side if there is excess play the bearings are starting to go. Some of these pumps cost over 800.00 dollars so take your time and dont damage it