Can I Repair Blade Of Box Fan
Foreword:
This page involves working on a piece of equipment that is going to exist plugged into the AC mains outlet. Common sense and attention to item is required. If you lot meet a bare wire or something like that could be a burn or daze take a chance. Consult someone with noesis in this field to advise you on a safe way to repair the problem.
Utilize of Circulating Fans:
When it's hot and you lot're trying to conserve energy (electrical), it makes the room feel cooler if there is air moving. It not only helps distribute the absurd air only helps you cool off by increasing the rate of evaporation from your peel. Fans don't absurd the air but they make it experience cooler.
Not Nigh Saving Money:
This should prove useful for those who don't similar throwing out something that'south useful and easily repaired. The cost of a new fan is negligible but, if nothing else, repairing it volition proceed information technology out of the landfill.
Common Problems:
With utilize, fans will develop problems. I have several of the Air King (Lasko) fans and they are generally well made only have a couple of common problems. If you have a similar fan, this will be helpful. Fifty-fifty if the fan y'all have information technology dissimilar, if it's repairable, this may assistance you to repair the fan you lot take.
Before you first on this, be absolutely sure that the fan is unplugged. If it has been on recently, you probably need to let the motor absurd. If it's really hot, information technology may have an hour to cool sufficiently to handle the internal parts.
I problem with these fans is that the blade assembly develops cracks around the hub. This causes the blades to slip. If you lot're lucky, the blade will fall off when you lot're paying attention. If not, the motor can get very hot and could be damaged. To repair the hub, yous can wrap a wire effectually it and twist it to tighten it up. Below, 14g magnet wire was used. Holes were made in the gussets around the hub and the wire was fed through it and out of a pigsty in the side of the assembly. The wire was chucked up in a drill and twisted. When doing this, y'all need to pull on the wire to go along it straight. With the ones that I've done, the 14g wire breaks merely about the time when it'due south perfectly tight. When it breaks, test fit information technology onto the motor shaft to make certain that information technology fits tightly enough non to come off. When information technology does, cut the wire off within well-nigh an inch of the hub (not critical but you don't desire to cut information technology off and so close that there are no coils to keep it tight).
Another large problem is lubrication. It'southward more difficult to get a good lubricant for these than I would have believed. To lubricate the motors, you need to detach them. If the bract associates isn't off of the motor, remove it. For these fans, the assembly pulls direct off (no screws, no retainers). As you can see, in that location are 4 screws in the motor housing. You'll need to remove those and remove the front end comprehend of the housing. If the lubricant has dried and hardened, it may be hard to remove only if the motor is similar to this, the housing cover pulls off after the 4 screws have been removed.
In several images, you can come across a rectangular object with two wires going into the potting cloth. This is a capacitor. This isn't critical to this simple repair but some may want to know that the device is. For this motor, the capacitor is used to produce a stage shift in the Ac drive voltage. This is needed to make the motor rotate. Motors similar those used in almost drills use brushes on a rotating commutator to drive dissimilar sets of windings to produce rotation. This type of motor is known as a permanent split-capacitor (PSC) induction motor.
Later a year or and then of employ, these fans volition typically be dirty. While it'due south apart, take all of the plastic bits (grills, blade assembly...) outside, soak them in your favorite household cleaner, let them set for a few minutes and wash them off with the water hose. To make clean the motor, utilise compressed air (outside).
If yous program on repairing these repeatedly, employ a drop of oil or a flake of grease to the tip of the screws earlier you reinstall them. Install all of them until they but bear on. Brand sure that the housing embrace is apartment on the residue of the housing and snug the screws downward. Don't over-tighten them.
In some motors, in that location are brushes to worry about. In these fans, there are no brushes. The rotor pulls direct out of the rear bearing. Information technology should pull out easily but if the quondam lubricant has hardened, it could have formed a shoulder backside the bushing and could take a bit of endeavour to pull it out.
When you lot get it out, you'll notice several washers on the front and rear of the rotor. These need to be kept in the correct order and intact. They're oft brittle so handle them as picayune as possible. In most instances, yous can but leave them in place.
Thrust Washers:
On some fan motors, you lot'll run across a wavy washer sandwiched between two flat washers. This is a thrust washer. It takes the slack out of the motor associates. This motor doesn't have them.
Removing One-time Lubricant:
You'll need to clean the old lubricant from both ends of the shaft. For this, acetone and paper towels works well. You need to make clean until y'all can feel no roughness with your fingernails in those locations. The shaft may exist discolored merely should be perfectly smooth. If it'due south non, you lot may have to re-surface it. It's best if you don't have to do this but may be necessary. You'll take to sand with whatever it takes to get the shaft smooth but the final sanding should be moisture-sanding with 1500 dust or effectively wet/dry sandpaper. Don't use anything more class than that unless absolutely necessary. To sand, yous can wrap the flatted function of the shaft in paper (notebook/printer newspaper) and chuck it upwardly in a drill to spin it.
To clean the inside of the bearings, you'll demand to wrap a piece of cloth effectually a pair of needle-nosed pliers or hemostats (available from Wal-Mart, eBay or whatsoever fishing supply retailer), wet it with solvent (acetone) and work information technology within the begetting. This works best if the towel fits actually tightly in the bearing (packed information technology, if necessary -- with something that can't scratch the bearing). Make clean information technology repeatedly until the cloth comes out clean.
I don't have a recommendation for a perfect lubricant. I've tried lots of things from wheel-bearing grease to synthetic motor oil. Nothing seems to last more than about a year. It doesn't take long to do this so twenty minutes a year isn't besides bad every bit maintenance. If you have white lithium grease, that works relatively well. I've used Wilson Combat Ultima Two and that seemed to last (still have a fan running it and so I don't know how long it will terminal). Whatever you lot use, don't use then much that it runs out of the motor.
Getting the Bearings Direct:
The bearings are set in a self-adjustment mountain. When working with them, they will exit of alignment. When you reinstall the rotor, move the top ed of the shaft in a circular movement to get the back bearing every bit shut to straight as possible. After reinstalling the embrace on the housing, tap the end of the shaft from all sides, rotate and echo until the shaft turns freely. If y'all don't do this, the fan will never work as efficiently as it should and the fan will need to be repaired once more sooner than it would with the bearings properly aligned. When tapping, do so with a modest cake of wood or the handle of a screwdriver. Yous don't want to impairment the shaft considering information technology will damage the bearing if you have to remove the comprehend again.
Reinstalling the Bract Assembly:
Since this is a press-fit, the only thing you actually accept to be concerned about is aligning the flat role of the shaft with the land in the blade associates. Press it on until it stops. Earlier sliding it onto the shaft, wipe the shaft with a clean paper towel and solvent (non enough to baste downwardly into the bushing) to remove any oil that could be on the shaft.
Testing:
After you go the fan completely assembled (including the grills installed, considering it will brand a difference), run the fan at the highest speed and turn it off, apply a stopwatch (on your telephone if y'all don't take any other) to measure the time from switching it off until it stops completely. This will give yous an idea of when the fan needs to be lubed again. When the time falls to 1/ii of the fourth dimension just later on re-lubing, plan on servicing it again. Utilize a sharpie to brand a note of the date and type of lube used. If done on the bottom side of the top of the fan frame, it won't be visible during normal employ.
Equally with anything, you don't want to repair something similar this, turn it on and either leave the home or become to sleep with it running. Information technology should be run for several hours (at least) before you practice either. There's ever the possibility that there is a problem that could be a fire hazard. This is especially true if the fan motor previously overheated due to a loose fan bract assembly or stale lubricant. It's non probable that there will be a problem simply something that you should exist aware of.
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