Moyer Diebel MH-6NM2 - Manual (Page 34)

BASIC SERVICE
32
MECHANICAL SERVICE
Pump Seal Replacement
1. Disconnect the power to the machine at the main breaker panel or fuse box.
2. Drain the machine.
3. Remove the front and side panels.
4. Remove drain plug on the pump volute and drain the pump.
5. Remove the pump hoses.
6. Disconnect the wires to the motor at the motor junction box.
7. Unbolt motor from machine base and remove the pump/motor assembly.
8. Remove bolts on volute and carefully remove from the pump flange.
9. Lock the motor shaft with a wrench or pliers. The back of motor shaft is square.
10. Turn the impeller counter-clockwise to remove from shaft (right hand threads).
11. Remove any shims or spacers and save for reassembly.
12. Remove the old seal and discard.
13. Check seal seat in the pump flange and clean thoroughly.
14. Press rubber seal/ceramic portion of seal assembly into the pump flange. Use a water
soluble lubricant. Be careful to keep the ceramic clean.
15. Install the rotating part of the seal on the shaft with the graphite surface toward the ceramic.
Use a water soluble lubricant on the rubber seal part only (not the graphite).
16. Reinstall spacers, impeller, and new flange gasket. Reinstall bolts.
17. Reinstall the pump/motor assembly and reconnect the pump hoses.
18. Fill the dishwasher with water.
19. Check motor rotation by bump starting motor.
Correct motor shaft rotation is clockwise when viewing motor from the rear.
20. Test run and check for leaks.
Figure 21
Pump Seal Replacement
Pump Flange
Seal Assy.
Impeller
Gaskets
Volute
Plug
Bolt
(A)
Nut
Backing Plate
Mtg. Nut Backing Plate
Washer
Bolt
(B)
Water
Slinger