top spray arm is not turning

[yoshi]

Frigidaire Dishwasher FDB635RFR4
the motor works and the dishes on the bottem get clean, it's the glasses on the top that don't get clean because the spray arm on the top is not turning.
Water is getting sent to the arm. I tripped the latch on the door and watch the bottem sprayer work great but the top arm does not seem to be getting high enough pressure water to make it turn. how high of pressure water should it get and what could cause it to be low? The spray arm will turn freely. I though it might just be hard to turn but feels just as free as the bottem sprayer
any ideas? thanks.....

[DisgruntledSearsTech]

On your style of dishwasher... The bottom runs for awhile... then the top runs awhile... they do not run the same time.. if you remove the botom arm and screen you will see a tower... remove tower and check to see if the check ball moves freely and has no obstructions....

[yoshi]

the ball that rides on the ramp is clean and no obstructions. What redirects the water flow and how does it push the ball out of the way. does the pump run backwards and or is it a different flow of water. water is getting pumped to the top spray nozzle just not high enough pressure to turn the arm. when the water flows to the top arm does the ball get pushed up and block off all the water to the lower arm? Thanks for your help ...

[Dan O.]

What redirects the water flow and how does it push the ball out of the way.

Frigidaire Precision Wash® System

The alternating of the spray arms is achieved with a check ball located on a ramp between two water outlets from the sump. There is an outlet in the center of the sump for the bottom spray arm. Then a second opening for the center spray arm.

The cycle starts with the check ball in the normal position resting at the bottom of the ramp covering the outlet for the upper arm. The outlet is not covered completely by the ball, some water does bypass the ball entering the delivery tube for the upper arm. The majority of the water leaves from the center opening, into the lower spray arm; washing is now into the lower rack.

Spraying From Center

To change the spray to the center, the control pauses the wash motor for not more then .6 of a second. During the pause, water pressure on the back of the check ball decreases, this allows the water located in the delivery tube to reenter the sump. The check ball is moved away from the opening by the returning water and is forced up the ramp. Now the wash pump restarts, this creates water pressure in front of the check ball moving it up into the center outlet stopping the lower spray arm. Check ball moved up ramp.

Water exits out the side outlet leading to the center arm and the upper rack. Water sprayed from the center spray arm sprays both into the upper rack and down onto the lower rack. At the same time, the shower nozzle in top of the tub sprays water down onto the upper rack.

To return spray to the lower spray arm, the pump is paused for 3 seconds. This longer pause allows all of the water to drain back into the sump from the delivery tube and the check ball to fall back down the ramp to recover the side outlet hole. This completes the change cycle. This cycling between the spray arms continues in all wash and rinse cycles.

JFYI

Dan O.
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