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OTR microwave turntable won't rotate

My OTR microwave oven turntable won't rotate. Instead it makes a grinding sound. When it first started to fail, the turntable still rotated intermittently. But now it never turns.

My guess is that a gear has stripped or the coupler between the turntable 3-pointed star and the motor has cracked.

1- How do I take apart the base of the oven enough to get to the turntable innards and check out my theory?
2- Can I order a replacement turntable coupler and replace it myself? I'm a bit handy with small tools but have never taken apart a microwave before.

Thanks!

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  • uprightowl Jan 05, 2008

    This is a GE Spacemaker model JVM1650SH (mfg July2004).

  • Anonymous Jan 08, 2008

    Same problem. Turntable started grinding and turning verrrrry slowly, only a half turn then stopped. Now it still grinds but does not move. Model MR6699G5 (or maybe GF). Installed in motorhome over the range. Anyone know how to get into the underside to get to the gears? Removing the entire micro appears to be very difficult. Or is repair not feasible? Thanks for any help.
    Morris

  • zimakas1 May 08, 2009

    I have a Sharp R930. I replaced the turntable motor. The coupler will only turn when the microwave is still upside down. When I turn it upright....nothing happens... the motor comes on......I can manually turn the coupler, as they say is normal........what now?

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  • Microwave Ovens Master
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You can usually find helpful exploded view diagrams and order parts by entering your full model number here: http://tinyurl.com/gv383

If not, please post your brand and model.

It's probably the motor, but possibly the coupler.

One quick check is to remove the turntable and support / roller ring and try to turn the coupler. It should be a little hard to get started, then you should hear a whirring sound, not a clicking or grinding, which would indicate a bad motor.

If the coupler turns loosely with no resistance, then it's probably bad.

Here is my text on replacing couplers, which had steps which are necessary when replacing motors. Note that if yours is a built-in model, ignore the part about turning it on its side *grin*

NOTES ON REPLACING TURNTABLE COUPLERS

Copyright 2007 by William E. Miller - MicrowaveDisplay.com

UNPLUG THE OVEN FROM THE WALL FIRST OR YOU WILL EXPOSE YOURSELF TO LETHAL VOLTAGES!

Note that I am not encouraging you to work on electrical items if you are not qualified, and I assume no liability for any consequences of your decision to do so.

When replacing the turntable coupler on most models, it is necessary to loosen or remove the screws that mount the turntable motor to the bottom of the chassis.

It is usually easier to do this with the microwave oven on its right (heaviest) side because you will need two hands for alignment.

Be sure to put a towel or similar cushion on the work surface to avoid scratching the oven wrapper (oven cover) or the work surface.

It is not necessary to remove the wrapper or the wires from the turntable motor itself, but you may need to remove a small metal duct covering the turntable motor if your oven has one.

It should only be held on by one or two screws.

Although a broken coupler may come out easily or even fall out, the new coupler will not go in without at least loosening the turntable motor.

Look at the hole in the new coupler. You'll notice it has (most do have) a flat side to it. That flat side will line up with the flat side on the motor shaft.

When the old coupler is out and the motor is loose, you can ease the new coupler in the hole with one hand while turning the coupler very slightly back and forth as you gently push the motor toward it. Do not force the part in.

When the coupler has mated properly with the motor, you should feel it go in.

Be sure it's right, or you may break the new coupler or bend the mounting ears of the motor when you attempt to tighten the screws.

Reassemble in reverse order.

We're happy to help and we appreciate your thoughtful rating of our answer.

Posted on Jan 13, 2008

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