Question about Dometic Rooftop RV Air Conditioner

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Fan motor locled

Dual shaft motor locked. Cannot turn by hand or with a wrench. used penetrating on small cloth wrapped around shaft by bearing. Still frozen. Unit is about 5 yrs old. not used for three years. quick cool brand.

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You are going to need to replace the motor. When it locks and you cannot turn by hand, that means that either the windings or the brakes have completely locked up. There is a way to open the motor but by the time you get it out, get the parts and replace everything, it is just cheaper to install a new motor. Please rate

Posted on Jun 04, 2010

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Posted on Jan 02, 2017

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How to replace bearings


Must disassemble the pump from the motor. The impeller has RH threads so hold motor armature (do not damage it) and turn impeller CCW to remove it from end of shaft. Hold armature in left hand and rotate impeller with right hand, turning hand on impeller back toward your body, or top of impeller toward you. Don't know how else to describe it. Once you have the impeller off everything should come apart pretty easily.
If impeller is really stuck, you will need to figure out how to hold it evenly all the way around without putting pressure on blades. Strap wrench, home made jig, something that can put more pressure on it than your hand.
You may want to remove the motor field so that you can grasp the armature while removing the impeller, do this by removing the long screws from the end of the motor.

Gently pry, tap, slide, however you can, get the bearings off the armature shaft without damaging any parts attached to it like fans, or starter centrifugal weights. Those things can be removed if needed.


Put new bearings on by sliding over shaft and seating in place by driving against the center race only. Do not drive bearing on by striking the outer race to move the inner race, this will damage the bearing.

Aug 14, 2012 | AO Smith SQ1152 Pool Pump Motor

1 Answer

HI, My Kenmore Air Conditioner Model# 76129 - turns on, makes a sound like it is going to work but the fan does not move. Thanks


When a fan malfunctions, the problem is usually loose or dirty blades. If the fan won't operate or if it's noisy, cleaning and tightening will usually fix it. Here's how to repair a room air conditioner's fan:
What You'll Need
You'll want to have these tools on hand to repair a room air conditioner's fan:
  • Vacuum
  • Soft cloth
  • Screwdriver or Allen wrench
  • Long-blade screwdriver
  • Wrench 20-weight nondetergent motor oil
  • Volt-ohmmeter or multimeter
Step 1: Open cabinet and locate fan.
Step 2: Clean away any debris with vacuum and soft cloth.
Step 3: Check fan blade on motor shaft for looseness. Blade is fastened to shaft with setscrew at hub of blade.
Tighten setscrew with screwdriver or Allen wrench. If air conditioner has round vent fan, tighten fan on motor shaft by inserting long-blade screwdriver through port in fan.
Fan is installed in its h­ousing with bolts, and vibration can loosen these fasteners. Then tighten them with wrench.
Step 4: If fan has oil ports, apply several drops of 20-weight nondetergent motor oil (not all-purpose oil) to each port at beginning of cooling season.
Step 5: If you suspect fan motor is faulty, test it with VOM set to RX1 scale. Disconnect terminal wires from terminals, and clip probes of VOM to wires.
If meter reads between about 3 and 30 ohms, motor is functioning properly. If meter reads either zero or an extremely high number, replace motor.
To remove the fan motor, remove the fan, the power wires, and several mounting bolts. Install the new motor with the reverse procedure .bobicehouse_59.jpg

Aug 13, 2011 | Kenmore 76129 Air Conditioner

1 Answer

THE NUT TO REMOVE THE BLADE CAME PART WAY OFF BUT NOW THE WHOLE MECHANISM...BLADE, WASHER, FAN ALL TURN...ARE LOOSE BUT THE SHAFT AND THE NUT TURN SO THERE IS NO PURCHASE TO LOOSEN FARTHER. HOW DO I HOLD...


Dependent upon the size of the shaft, a choice of suitable tools would vary. Considering this is the shaft off of an electric motor, may I suggest you wrap a rag around the area of the shaft where you can grip it and use a pair of Vise Grip locking pliars to hold it while you turn the nut. If the vise grips won't open wide enough, then use a rag with a pipe wrench locked onto the shaft to hold it.

Jan 30, 2011 | Black & Decker 19" Electric Lawnhog...

1 Answer

Bad bearings on a small HT800 table top fan. where can i get a replacment bearing?


Unfortunately, this fan was designed to be ran until it wouldn't run anymore, then thrown out.

However, I likely know what the problem is. The motors in these and most other small fans are a C-Frame Shaded pole design, they have porous bronze bearings, with a small amount of wicking material around them. They supposedly are oiled when they leave the factory (the motor factory not the fan factory) What happens is, the oil on the bearing surface is churned around by the rotating shaft and the heat from the motor slowly evaporates it, as this happens, the wicking provides more oil, which soaks through the porous bronze bearing, keeping everything lubricated. Over time, two things happen, 1. If the oil used wasn't very pure (and we are talking a $15 fan here) the volatile parts of the oil will evaporate leaving behind what won't evaporate, therby "gumming" up the bearings, making the blade hard to turn by hand and the fan very hard to start running, but once it gets going, it runs OK.

2. All the oil evaporates out, then the bearing and shaft are running together dry, the motor will run like this for quite sometime as the bronze is softer than the shaft and the metal coming off the bearing will provide some lubrication, but the bearing is being eaten up by the harder shaft. Eventually, the bearing will wear so much that the rotor drags on the stator and the fan will suddenly lock up hard when running and make a loud buzzing noise like hair clippers.


From what I remember, I had one of these that I used to boost the output from an oil filled radiator and when it gummed up, I was going to take it apart and re-oil it, but the thing is held together with security screws which I didn't have the tool to remove, so I threw it out.

However, if you can get in it, open it up, pop the blade off the shaft by pulling on it, motor should be held in with 2-4 screws, get some 3 in 1 oil (in the blue can) and oil both at the shaft and behind it where the wicking is. Leave the motor hanging there, plug it in, run it for a while to get it warm and oil it again, then put it back together and it should go back to working for a few more years.

Hope this helps :)

Jan 28, 2011 | Honeywell HT-800 Table Fan

1 Answer

My standing fan is humming and wont spin the way it should. It spins in the reverse direction at an extremely slowly, kinda like its dried(already oiled it up). When I try to manually give it a push start,...


Sounds like the shaft & bearings are gummed up. Clean them up with Liquid Wrench or WD - 40 (sparingly) spinning the shaft by hand to get it inside the bearings, front & rear. You should feel it loosening up. Then remove as much as you can with a cloth while spinning the shaft. Then relube with 3-in-1 oil. --- Oil alone will not cut thru the gum. Remember WD - 40 and Liquid Wrench are not lubricants!! You must use 3 -in-1oil or the likes.

Dec 02, 2010 | Accutek AOJ-1601 Stand (Pedestal) Fan

1 Answer

How do i do it myself to install outdoor bower motor condensor motor 1/4 hospower 350 rpm and also the 5 amp capacitor. If i keep the 10 amp capacitor is that a problem?


Turn off power in all cases. If you are replacing the orignal motor for the 1st time. It might be easier if
you cut the wires near the control box and then wire
nut them together and wrap with electrical tape.

Remove the fan cover and unloosen bolt that hold the
fan to the frame or whatever it might be. After fan is out spray some WD40 that holds the fan blade to
the motor shaft. Measure the distance from the fan
blades to the motor.

Unloosen the screw that holds the fan blade to the
motor shaft.Take sand cloth and try to clean up
the shaft below the blades. Try to tap the fan blade
down towards the motor.If it moves sand the shaft above the blades. Take channel locks and grip the shaft below the blades, try turning the fan blade while
holding the shaft until it spins freely and the remove.

If the motor came with a 5mfd capacitor use it.

Jul 01, 2010 | Heating & Cooling

1 Answer

I have a Waterways 3.5hp pump that I am trying to remove the impeller from. I can lock the shaft but the impeller will not turn off by hand. Is there a method or tool to assist in turning off the impeller?


Are you holding the motor using the 'flats' on the shaft on the back side?

I have removed lots of impellers - usually I find the center has spun out of the impeller so I use channel locks to remove the hub. All the pumps I take care of are standard thread - might yours be 'backward'?

Try this, get a leather belt and wrap it around the impeller. About a foot from the end, put a stick under the belt. Hold the stick and belt together and try to lever it off that way.

Mar 12, 2010 | Waterway Spa Pump Executive 56 Frame 4hp...

1 Answer

I cant get the fan off of the electric motor in my clothes dryer, i have the motor loose from the base and it moves around but i cant tell how the fan is fastened to the motor shaft and i cant get it off


Most of these are reverse threaded. There should be a place on the shaft that is flat on 2 sides a1/2" or 9/16" wrench will fit into the slots. Hold the wrench stationary with the fan facing you turn clockwise.
I know this sounds backwards but it should work.
Hope this helps
Please leave feed back

Dec 01, 2009 | Dryers

1 Answer

I have a hoover elite 200 it did not have a belt on it when i got it and i cant find the drive shaft.


You must remove the lid of the vac and find the pulley end of the brush. directly behind it one hand length you will see a small silver shaft. If the shaft is other than silver it is coated with burned rubber. or rust and dirt.
Clean off the burned rubber polishing the shaft with wet dry sandpaper . Then rotate by hand to test for any blockage in the motor fan. Also rotate the brush roll to see that it spins freely. Using a genuine hoover ELITE belt wrap the belt around the motor shaft and brush roll and use the brush to stretch the belt forward as you lower the brush into place. Once seated , rotate the brush again to see that the belt is turning, then reinstall the lid. Do not pick up anything larger than your fingernail or you will blow the fan on this unit.

Sep 12, 2009 | Vacuums

1 Answer

My Duo Therm Brisk Aire has a bearing going out on the fan motor. What is the best way to get the motor out? Having trouble getting in to get the squirrel cage off of the motor shaft. Thanks Rick


    Here is what we do:    If possible, we take the whole thing out; motor and fan blades together. Then we sand down the exposed part of the shaft. put penetrating oil on as much as the shaft we can reach. Loosen the set screw(s). If the shaft has a flat on it and you have the room put a cresent wrench on the exposed shaft while moving the squarle cage back and forth. on the shaft, working in the oil.  Put more oil on the shaft and slowly twist it off onto the shaft you have polished with the emery paper.     Baring that working, you still have two options. Take the motor to an electricial motor rrepair place . They can get you a replacment motor usually cheeper that anyone else. Thy likely can also get you the sqirrell cage fan or you can hack saw the shaft from the back(motor) side and take the shaft off that way. This should be a last resort as you may be able to disassemble the motor and Grease the bearings, and place the same motor back into service. I hope this helps.

Apr 22, 2009 | Dometic Rooftop RV Air Conditioner

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