the coupling does go bad, Often, very often
one of the two spiders is attached to the motor shaft, one is attached to the gearbox input shaft and the rubber ring mates them together, the motor shaft coupling collapses often,
the coupling is ~$16-$25 depending on the parts sales place.
If you can see the coupling, you probably already have the body off,
If not remove the body
from there its easy to replace
undo 2 spring clips that hold the pump on the outer of the motor,
pull pump forward and off the motor shaft and swing aside,
remove screw from head of spring clip between motor and gearbox, remove this spring clip (remember position)
swing motor against coupling to loosen other spring clip, remove spring clip
pull motor forward and away from gearbox
break couplings off shaft of motor and gearbox.
- NOTE: new coupling sets have a metal center hub to combat this very common failure,
ask the parts supplier if they have one with metal hubs,
if they offer to sell you one identical to the picture, all plastic, old style
Fit new couplings to motor and gearbox shaft using wooden dowel between the teeth, on the hub centers, hit the dowel, not the gear, with a hammer.
fit new rubber ring to gearbox,
install in reverse order
rotate motor to align the teeth
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