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Nylon Coupler cracks when installing

I need to get replacement Nylon shaft couplers and why do they crack when I install them?

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I would call Dremel direct at 1-800-437-3635 and order them. They also have a tech line, but I would think that they are in a bind when installing and cracking. Look at the bearings to make sure they are not tight or completely locked up. Let me know if I can help further

Posted on Jan 10, 2009


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Platinum vacuum pump, coupling broken what is the reason

First, I'm not a PLATNUM tech. Your should call your vendor for service. Check warranty!
*** The following is for information only. ***
* Coupling is the direct connection of the electric motor shaft to the pump. Coupling will break from some of the following conditions:
* No oil (in pump). Over heated and froze up piston in vacuum section. Pump needs rebuilding/replacement.
* liquid refrigerant / oil going to pump. The system still has pressure? Vacuum pump is to remove left over gases after system has reached outside air pressure.
* If pump is being used to recover liquids then there needs to be a liquid separator before the vacuum pump to prevent liquids from getting into pump.
* If this pump/motor was serviced and not aligned when coupled together. The coupler may handle minor alignment problems (depending on type of coupler) But you should check it if your having problems with the coupler getting loose or cracking. (it can also be a bent shaft.) Check bearings while your at it.
* Final; Check your warranty BEFORE working on this type of pump.
Aloha, ukeboy57

Mar 12, 2018 | Refrigerators

1 Answer

My Whirlpool Whirlpool microwave table does not turn

Usually indicates a bad turntable motor (accessable from the bottom of the microwave oven), but sometimes (in some cases) the turntable shaft coupler (which is made out of plastic), splits or cracks, so the motor turns, and the shaft slips inside the coupler.

If you need further help, reach me via phone at

Sep 08, 2014 | Microwave Ovens

1 Answer

How did the upgrade pump for Excel VR2500 seize during first use?

This happens when the pump is installed. When you slide the pump up the shaft and the key slides up the shaft to the curved groove in the engine shaft. When this happens it forces the key to push to far in to the pump hollow shaft and cracks and breaks it

May 27, 2014 | Annovi Reverberi RMW2.5G25D

1 Answer

Microwave table not turning

The first thing I would check is the coupler. Remove the glass tray and pull the coupler up. Check it for any cracks.If the coupler is fine then the turntable motor has to be replaced.It can be easy replaced after the bottom panel removed - just two screws and the wire plug.
Thanks for using Fixya.

Apr 13, 2011 | Ovens

1 Answer

I installed a sprocket and gear assembly kit to the garage door opener. It runs forward and then quickly runs backwards. Tried to adjust sensors and the motor does the same thing. Goes forward for a bit...

Make sure you put the black cup back on the end of the motor shaft and that it is pressed all the way on. Make sure the RPM sensor is plugged in. If neither of these are the issue, then you probably did not have the motor shaft pushed all the way back when you tightened the coupler after replacing the worm gear. Loosen that coupler up and from the front of the motor (opposite end in which the coupler is on) push the shaft back as far as it will go. Hold it there while you tighten the coupler back up and then try it.

May 21, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Turntable does not function

The first thing I would check is the coupler

Remove the glass tray and pull the coupler up. Check it for any cracks.

If the coupler is fine then the turntable motor has to be replaced.

It can be easy replaced after the bottom panel removed - just two screws and the wire plug.

Jul 02, 2009 | Microwave Ovens

1 Answer

Need to plastic coupler that holds turn table in place

If you need a replacement turntable coupler, you can find this part listed as item number 942560 at Just type in your model number.

To replace, all you need to do is carefully slide something under the existing coupler (if you can) and pry up. The coupler will pull off the motor shaft.

If you cannot access the coupler due to the way it was broken, simply remove the bottom panel UNDER the oven. With the panel removed, locate the small turntable motor and loosen the mounting screws to remove. The coupler should be easily accessible with the motor out of the unit. Make sure you reinstall the turntable motor and bottom panel BEFORE you try to install the new coupler. The coupler needs to be installed from inside the oven cavity by placing it in the opening in the oven floor and pushing straight down onto the motor shaft.

If you have questions, or require additional assistanc, please let me know. I hope this helps you.

Jan 14, 2009 | Hotpoint RVM1435 Microwave Oven

1 Answer

Nylon Coupler crscks when installing

I'll answer last question first. They might be cracking because they are in a bind and when turned on or inserted on the shaft there is too much pressure. Make sure the shafts are free of any debris from the original coupling, also check the bearings for wear or being so tight that they twist the coupling. Everything should move freely. And second I would recommend calling Dremel direct at 1-800-437-3635 for replacement parts. Hope this helps.

Dec 26, 2008 | Dremel Variable - Speed Multipro Rotary...

1 Answer

Smells like rubber burning

Hi and welcome to FixYa!
First thing to check is to make sure that you have pressed the couplings on the motor and transmission shafts all the way on to the point where the metal ring on the new coupler is totally flush with the shaft. If you do not do this, you will get a binding condition.
Another is that some people really pound on those couplers to get them on, and this can damage the bearings in the motor. First do as I outlined and make sure the new couplers are on all the way, and is the noise does not go away remove the coupler altogether and re-install the motor and listen for the noise. if you ruined your motor, you will know. FYI that motor is not servicable; it will have to be replaced. The way I install those couplers is to use a deep socket that closeley matches up with the metal ring on the new coupler (you may have noticed the old one had no ring) and tap it LIGHTLY to get it to seat on the motor shaft and tranny shaft.

Hope this helps you..!

Dec 14, 2008 | Kenmore Washing Machines

4 Answers

Kenmore 70 series washing machine

Does not agitate, does it spin? If it doesnt you have a coupler failure. If it does spin then the agitator dogs have worn to the point of no return.

This is the link for a coupler;
The coupler is accessed by pulling the machine out 2 feet and tilting it back to expose the bottom of the machine. Once done follow the pump( has two hoses attached) to the motor and after that is the gearcase. Between the motor and the gearcase is a coupler. There is a small gap between a black plate where the motor attaches and the gearcase.Reach from front to the plate and feel behind it up in the gap. This is where the coupler is and if you feel soft spots or if you try to rotate it and it separates get a flashlight and a friend to spot hold the machine while you crawl under to look at it. You need to look at the white flanges for cracks and push on the flanges while checking. If so this machine is designed to be an easy fix. The pump removes by popping the clips top and bottom as well the motor with the addition of 2 1/4 inch hex screws and a wire harness plug( may have one to three additional wires for a capacitor and a switch, two red and a white wire). Once the motor is off you can see better as to what the damage is... If the coupler falls apart upon removing the motor finish removing it from both sides. When replacing I use a 9 inch extension and a deep well socket about 1/2 in size to seat the flanges flush to the motor and gear case shafts using a small hammer not hitting to hard.
This is the link for the agitator dogs;

For the agitator a sure test is to reach in and rotate the agitator back and forth, it should only go one direction, if it is free then this is the problem.
The dogs are below the softener cup on the agitator,when removed you will see a seal cap that has to be removed. After this you will see a round insert with a 7/16 or 1/2 inch bolt attaching it to the gearcase spindle. once out the agitator assembly will pull out separating into a lower and top half. The top if turned upside down will dump the contents of the agitator dog assembly. These are simple to replace and if there is no retainer, a little vaseline will stick them long enough to re assemble, just watch how they remove and note any fins and notchs use between the upper and lower halfs to align them.

Sep 20, 2008 | Washing Machines

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