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3. Lower]mpeller- Circulates the water from the pump housing through the spray tube, or middle and upper arms,
during the wash and rinse cycle
When the motor reverses for the drain cycle, the lower impeller forces the water through the discharge port to
pump the water from Lhe machine
Pump Plate and Shroud- On dishwashers manufactured since 1969, a shroud was added to the pump plate, to
further protect the pump assembly from foreign objects.
Blade or Macerator- Pulverizes fooa particles and thus enables them to pass through the pump system without
obstructing the water flow. This eliminates the need for pre-rinsing and a fitter screen
-Upper Impeller- Circulates water through-the-upper pump housing and into the spray arm.
Spray Arm, Nut and Washer- The velocity of the water discharged from the spray arm ports and the angle of
the port opening causes the spray arm to rotate at approximately 25 to 45 R,P.M. The rotation of the spray
arm is essential for proper washing action.
When servicing the pump assembly, always check the spray arm for proper operation. It must turn freely on the pump
housing If binding is evident, check the following: (Refer to Figure 15)
!.. Check the mounting holes in the arm for roundness. ]f evidence of distortion is present, replace the spray arm
2. Check for possible binding on the pump housing. Plastics occasionally have a tendency to swell or "grow.," [f
binding is encountered, replace the upper pump housing..
3. Check to be sure the nut is properly installed to the spray arm. An improperly installed nut will lock the spray
arm to the pump housing,
4. Check for a split spray arm. A split seam will reduce the efficiency of the arm and may cause a leak at the door
seal or blower housing.
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7.
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