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Seized motor bearing causing fan and housing to melt

Hallo, I have a Qualcast Power-Trak 34 mower. I need a bottom bearing, fan and the large plastic moulding that those parts sit in. Are they available separately please? Many thanks!

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How old is your mower? Qualcast claims a 5 year guarantee on the Power-Trak 34. Either way, here is a parts list for you: http://www.powertoolspares.com/qualcast-garden-spare-parts-4/6000554/qualcast-rotary-mowers/2002164/lawnmower-power-trak-34-spares/F016508042/F016508042.php

Posted on Sep 09, 2009

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Im trying to replace a fan on a simplicity freedom f3300 vacum. HOW DOES THE OLD FAN COME OFF? It seems to be pressed on but I dont want to brake anything.


Assuming you have the motor out of the fan housings, check to see if you can move the fan around clockwise/counter-clockwise. If the fan is not moveable, the fan has probably melted to the motor housing. Replacing the motor is recommended as the plastic motor housing under the fan is probably damaged/melted. It could still be fixed but there is a possibility of damaging the housing. If after removing the fan following the directions below be sure to remove/trim any melted plastic away from housing before replacing fan. Not trimming the plastic could result in your new fan melting again to the housing when the machine is turned on. If you have an older model pay careful attention to the carbon brush area, if there are plastic posts holding the carbon brush springs, these are easy to break.

If the fan is movable, remove the nut and washers from fan. Use two large flat head screwdrivers and place them opposite of each other under the bottom lip of the fan between the fan and motor housing. (it might be a little easier if you have an extra pair of hands to hold the motor). With the flat heads in place, push the handles of the flatheads toward the side of the motor where the belt shaft is. If the fan does not pop off rotate the position of the screwdrivers and try again. Pay close attention that the fan washer is installed before replacing your new fan. after installing the new fan, rotate it several times making sure it isn't rubbing anywhere.

If you need any further help feel free to contact me.

Tim
TheVacCenter.com

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1 Answer

Only one fan working


There are two causes of your problems:
1. The fan needs you to manually turn it to start running.
Problem: The motor bearings both ends are dried out.
Solution:
1. Remove the motor/fan from the motor housing (there are two screws that hold the motor to the housing. The only way I know how to get to the screw is to bend one of the fan blade up and use a long screw driver to get to the screws.
2. Remove the two screws that hold the bearings to the motor.
3. Detach the bottom bearing (opposite of the fan end.) You might have to use a flat screw driver to pry the bearing off.
4. Use a Q-tip and soak it with motor oil or grease then lubri- cate the fan end shaft/bearing.
5. Use a Q-tip + alcohol to clean up the bottom bearing hole, then lubricate it with grease or motor oil.
6. Put the motor and bearings back together and make sure that the fan can turn freely now.
7. Install the motor/fan back into it housing.
The fan should turn on its own without you helping it.
If the fan won't turn, you have a bigger problem. See below.

2. The fan won't turn at all and is really tight even when you try to
turn it by hand.
Problem: The transformer coil(s) is/are burnt out. Chances are you let the fan run dry to a point that it squealed and started to smell like it was burning before it quit all together.
Solution 1:
1. Remove the filters and their housing on the bad fan side.
2. Duct tape a piece of plastic over the bad fan opening.
3. Run the humidifier with one fan. It works just as well.

Solution 2:
1. Buy a new humidifier.
2. Make sure you lubricate the bearings as soon as the motor begins to squeal.

Solution 3: You need knowledge of electricity
1. Take the motor/fan out from the housing.
2. Use a vote meter to check the resistance in both coil of the transformer; should read about 17 ohms. The coil(s) that has a high reading or if the meter shows 'OL' is bad. Remove the Yellow tape from the coil to see if you have a loose soldering joint between the coil wiring the electrical cord. If yes, solder the joint back together, check the resistance again to make sure you have about 17 ohms. If the answer is yes, put the yellow tape back on the coil and use electrical tape to secure the tape. Hopefully, the fan should work now. Good luck!

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Since you didn't leave a model number, I will have to give you a generic answer, instead of one with a part number of the most likely replacement part. Normlly the problem you discribe is a result of the blower motor bearing wearing out and letting the fan blades rub against the housing. And since the bearing is internal to the motor, you have to replace the entire motor.

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1 Answer

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