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Motor hums over used/overheated - Karcher K3.68MR Electric Pressure Washer

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Dear Sir,
Most probable the capacitor is faulty. Then one must see why the
capacitor got faulty. This could be, due to a spill valve problem.
When the spill valve starts making the power wash going ON and OFF....the capacitor will get heated and practically it nearly explodes.
Also damaged inlet or outlet valves, will also make damage to the capactor. This model and other similar can change the whole head...with valves and Spill Valve. Also the capacitor must be replaced. A T15 screw driver will be good for the cover, if you intend to do the fixing yourself.
Regarding the spill valve....this is a unit that with pressure, it activates the machine. When the gun is closed...pressure accumulates in the spill valve and it will move to close the electric power. When gun is opened...the pressure is released and the machine starts pumping.

Posted on Feb 03, 2015


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Posted on Jan 02, 2017


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Is there a reset button on the motor for this model? It overheated and now only makes a hum, no motor movement at all! I think the motor has worn out...?

As it is humming it is consuming current. If nothing else is happening it could be the motor is seized or something is in the gearbox or mechanism jamming it.
The motor is generally a brush-type series-wound type which do not tolerate overheating very well and when jammed self-destruct very quickly. I guess in a dedicated business machine it could conceivably be another type of motor.

I suggest you disconnect it from the power and partially dismantle it again and attempt to turn the motor and mechanism by hand. If it turns easily it is likely an electrical fault and if it doesn't the trouble is mechanical.

Unless it was a very expensive shredder spare parts are likely to be a big problem.

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I must have gotten a pit stuck however when I feel in there there's nothing left n there. There's power to it because it hums but it doesn't chop. Any suggestions.

Put a wood broomstick down in the opening, or use allen wrench on bottom of motor, and see if you can free up the cutter disk.
You want the disk to rotate freely.
The use vacuum cleaner hose to make sure all the small stuff is removed.
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Dishrag caught un disposal, pulled it out, blades turn, it just hums, it hums even when switch is turned on off!!

If cutter disk turns freely and motor hums, then motor winding has gone bad.
The humming sound means motor is overheating and will stop humming.

I wrote ez garbage disposal replacement steps from days when I worked apartment maintenance.

Upvote the help.
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Motor hums attemps to turn but does not

If motor hums and does not rotate, the motor winding is bad.
Motor is overheating and will stop humming and it will not work again.
30 years ago, motors were rewound at local electric shop.
Today the copper winding and steel parts are recycled or thrown into landfill.
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My tablesaw will no longer run. I plug it in and turn it on, the blade partially moves and I hear a humming sound

The motor is receiving power, and that is the humming noise.
The humming sound also says the motor is overheating and will burn out.

Turn saw off.
Use hand and manually rotate blade to see if it rolls free.

For example on my saw, the blade barely turned because a bearing was rusted.
I soaked the bearing in wd-40 and 3-in-one oil and salvaged it.
Look for oil ports on each end of motor, and on bearings.
Clean pulleys and belt that connect blade to motor.

If your blade rolls free, and the motor shaft moves freely, then the motor winding has gone bad, so replace motor.

Add a comment for more free help.
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Garbage dispoal not working. The blades spin freely inside, the reset button has been reset, when you switch it on the moter makes a faint humming sound, and the allen wrench will not rotate either way.

You need a new disposal.
Free-rotating blades show there is no obstruction.
Humming says you have power.
Frozen allen wrench says bearings are rusted.
Motor is now overheating each timer electricity is turned on, and motor will overheat and stop humming.
At least the drain is clean and water is not flooding under the sink, which means you can continue using sink until disposal is replaced.

I wrote tips for installing disposal from days when I worked apartment maintenance:

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Both blades and turn screw on bottom turn, but motor just hums

When the motor goes bad, it begins to slow down until it stops.
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I wrote ez replacement step from days I worked apartment maintenance.

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The motor is overheating and the heat sensor is switching it off.Replacing the motor should cure the problem...Good luck....Nomess

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Motor making loud humming noises and kicks out. Could this be a capacitor on the motor going bad ? This doesn"t happen all the time, but frequency is increasing.

this is the motor overheating and, the overload shutting down the motor: check to see if the motor belt is binding

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sounds like it may be overheating.. Might try to take apart and see how much lint you got built up on the motor... may be causing overheating Is this the ONLY time it makes the humming noise when you go to start it??? May also be the early warning of bad start winding or start relay on the motor

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