Wash Manifold Restrictor Adjustment; Pump Seal Replacement - Champion USN-72 Technical Manual

5.3 Component Repair and Replacement

5.3.13 Wash Manifold Restrictor Adjustment

Refer to Fig. 6.14, Replacement Parts, Item 8. The illustration shows the slide restrictor mounted
in the lower wash manifold of each tank. The restrictor is set at the factory but may be adjusted
if necessary. The factory setting evenly balances the water pumped to the upper and lower spray
pipes. If more water is required in the lower pipes, then the restrictor should be pulled out. If
less water is required in the lower spray pipes, then the restrictor should be pushed in.
To adjust the restrictor: Turn off power at the dishwasher control cabinet. Loosen the mani-
fold bolts (Item 2) in the lower manifold. Move the restrictor to the desired position. Tighten the
manifold bolts. Turn on power and operate the dishwasher. Observe the spray pattern between
the upper and lower spray pipes. The lower spray pattern should not be reduced to less than 1/3
of the upper spray pipe water pattern because washing results may suffer as a result.

5.3.14 Pump Seal Replacement

Refer to Fig. 6.13, Replacement Parts, for a detailed drawing of the pump/motor assembly.
Perform the steps listed below to replace a pump seal.
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 (if applicable).
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. Remove the impeller retaining bolt and nut from center of impeller.
10. Lock the motor shaft with a wrench or pliers. The back of motor shaft is square.
11. Turn the impeller counterclockwise to remove from shaft (right hand threads).
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 impeller, and new flange gaskets. Reinstall bolts. Reinstall drain plug.
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.
Part 5: BASIC SERVICE
(Cont.)
47