Removing top spray arm from whirlpool mdb7100aww

If you are speaking about the filter behind the spray arm in the tub:
grasp the tower (the top post above the spray arm)
and unscrew it. CCW under and in the center of the tower hole thus revealed is a philips screw and fiber washer holding the spray arm on remove these then remove the arm. next, using a flat screwdriver un-snap the filter cover

Sounds like your not using a rinse aid. Fill the dispenser with jet dry. Not only it keeps dishes spot free but it help to dry them as well.

Hi

Please check if something is blocked near the top spray arm, also make sure that all holes are open. Use a sharp metal pin to clean the holes on the top spray arm. Make sure the water pressure is not low.

under the screen and you'll need a Torx screwdriver to get to it after you remove the spray arm and screen. Check to see that the path it travels is clear. I have seen these get blocked up by stuff.

Now check if the top arm spins freely and check the bearings for the arm, if they are producing extra friction while the spray arm spins. Hope this helps... Please post back if you need more assistance.

sounds like the chopper is plugged or broken. remove the lower spray arm by holding tab with a set of plyers and turn spray arm counter clockwise. then where the middle spray arm attaches at the back of tub remove screw. turn the housing on pump to the right side of the machine( its easier to pull top rack out a bit so that whole housing can move) it will turn a little bit to be released from top of pump. then take out the torx screws that hold the housing and filter on. in the sump there will be one or two more smaller torx screws remove those and remove coverings to the chopper. check to see if the mesh is plugged with food and other things. clean. also check to see if blade turn with the motor impeller. if not then the chopper needs to be replaced. good luck

The broken bottom arm is probably preventing any water / water under pressure to get to the upper arm.
After you replace the lower arm, you should have much better cleaning in the top shelf.
While you are in there replacing the lower arm, recommend you remove the filter under it and clean the filter and any debris you find. Be careful of broken glass!
Good Luck!

The top rack is not cleaning because of low water pressure from the wash motor to the upper spray arm.
Assuming the top spray arms are clear of debris, remove the lower spray arm and lower feed tube to access the wash motor. Remove the 4 torx screws and the filter (accumulator assembly). Remove the torx screw and the inlet protector that covers the chopper assembly. Make sure the chopper is not broken (broken chopper will fill with debris and block water flow). While holding the chopper blade, reach inside the "D" shaped opening on top of the motor and spin the wheel/motor by hand in each direction to make sure either the chopper gear or the motor gear that drives the chopper is not broken. Replace the chopper if necessary (part # 8268383). If the motor gear is broken, replace the sump and motor assembly (part # 8535150). Remove any debris from the sump area in the process.
You don't have to shut the power off to the dishwasher because the door will be open, but if you feel more comfortable, do so.
Good luck!

Check the upper spray arm holes for debris that may be plugging up the spray arm. If clean remove the lower spray arm and filter screen and clean out any debris in the sump.

A guess: the solenoid that directs the water from the pump is not opening fully. Clean it. It is a little nasty to get to but will likely cure the problem.

decrete, you want to get down to the chopper and screen. If the screen is plugged up with gunk there won't be enough pressure to reach the top spray arms. Check out the posted pics. Remove the lower spray arm. Rotate the rear feed arm to the right until it unsnaps from the tube going up the back. See the 4 torq screws holding the filter on. Remove them. Lift the filter up. Now you will see the chopper inlet cover. 1 torq screw holding it in. Lift it up and there's the chopper and screen. Catriver..post back

arms should turn freely. spray arms are only rotated by water spraying out from angled jets at end. check for blockage in spray arms - sweet corn and rice are the worst offenders. take spray arms off and run water in centre hole and see it runs out of all the jets freely