It's true that Norelco does not sell parts for this unit, but you can buy a exact replacement for the pump motor here:https://www.amazon.com/dp/B0146XUE4I/ref=cm_sw_r_api_i_KGSBKR1BPW349RR3YRSB_0?psc=1.The only difference will be the length of the replacement motor shaft is too long, but this can be modified using a Dremel cut-off tool. Getting to the motor is a bit involved, but it is possible to do so without breaking anything. You'll need a T-8 driver and a small flat screw screw driver Begin by releasing the bottom, remove the fluid cartridge, and turn the unit upside down. Find and remove the (3) T-8 screws along the bottom perimeter.
Next, use the small flat screwdriver or plastic pry bar to lift the outer case over the upper edge of the rear power supply socket and slide the outer case down. You'll also need to press the cartridge release button to clear the case
Slip the outer case off the bottom. You'll need to twist it somewhat to clear the base. Now find and unplug the two side wire connectors (purple/white and orange/white wires) and slide the rear power supply connector off of the back of the unit, leaving it connected to the circuit board
Now find and remove the (4) silver T-8 screws holding the base to the circuit board. Back the screws out only far enough to separate the base from the circuit board, leaving them attached to the black base so as to make it easier to reinstall later
Gently separate the base from the circuit board. You will feel a bit of resistance as a hose separates from the base. Note where it attaches for later reinstallation. Now we need to remove the "legs" to gain access to the bottom of the pump. Place the separated vase upright and compress the springs to lock the legs in closed position. Note the two hooked ends sticking up. You will be using the small flat screwdriver to pry these towards the center.
Open the "legs" by pressing the side button. Slide the flat screwdriver down the side of the base and use it to pry the hook so you can pull the leg out. You'll have to pull slightly on the bottom while doing this until you feel the hook release, and then you'll move the screwdriver to the second hook on this leg and repeat. Then move to the other leg and do the same. It takes a bit of practice but it'll eventually release. Be gentle.
Separate the leg unit from the rest of the base. Be careful not to tangle or damage the coil springs. Set the legs and springs aside. Inspect the bottom of the pump. Gently pry the bottom cap off of the pump with your fingernails.
Gently pry the impeller off the bottom of the pump motor shaft using a tiny screwdriver. Be careful not to damage the impeller.
Turn the pump unit over. Use small screwdriver to gently pop loose the pump motor restraint (3 points)
Lift the pump motor out of the housing. You can now clean the housing.
Remove the two seals from the impeller end of the motor. You will transfer these to the replacement motor.
Use soldering iron to remove the wires from the old motor and solder them to the new motor. Use a Dremel tool to shorten the shaft of the replacement motor to match the length of the old motor.Installation is the reverse of removal except I recommend saving reinstallation of the "legs" and springs for last - put everything else together first, including the outer case. Then line up the springs and legs and carefully press them together.