We have owned our rainbow D3C for several years, haven't used it much lately due to a whole house system in our house. The suction doesn't seem to be like it should, the separator is clean, is there something else to be checked?
With years of use, you will collect a layer of "micro dust" on the impeller (the fan part) which reduces the efficiency. A toothbrush and some mild cleaner with gently scrubbing will restore it's power.
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Re: rainbow D3C Low suction
You might check the carbon brushes on the motor, it could be that the motor is not running fast enough, which would mean replacing the motor. With the hose off, do you have good suction where the motor goes into the vac? If it is good there, then either the powerhead isn't working or the hose is clogged.
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You may have damaged a bearing or bearing housing and that could be causing the motor armature and field to rub together which in turn causes the motor to draw a significantly increased current to overcome the friction. It could be a simple fix if it is a bearing but if it is the housing then it is likely toast. I used to repair motors years ago and the cost then was not bad. However if the motor is heat damaged, as happened to my power rack last year, it was cheaper to buy a new one than replace the motor. A burned out motor is not worth repairing these days.
I used to sell rainbow vacuums and this latest 2 speed model does whine when it is first turned on. So you definately have nothing to worry about. I believe this is due to the fact that this motor is much more powerful than in the previous 1 speed E series model. I finally just purchased a 2 speed model after many many years of wanting one. Good luck to ya and enjoy your clean house!
you will have to replace the whole motor as these motors where never made to be serviceable. if you take the motor to a local vacuum shop than can order you a new one. though i would recomend replacing the whole tank unit with a Nutone or Hayden they are far better systems.
NO NO NO NO you have to get a new hose in this situation there is no other way around it. If you screw up just the littlest bit reattaching that hose a vacuum that uses water will QUICKLY let you know. Do yourself, your family, and your life insurance company a favor and buy a new hose.
Is the water seal in place or missing? Another cause would be a bad motor, running at a slower speed will mean low suction. If it is a motor, then you would have to replace it. Is the suction low at machine without the hose, if it is ok then may be a clog in the hose.
Being an E series some have a corrgated filter in the top, there is also a filter on the back. Could be a motor problem, not turning as fast as it should, in which case you will have to replace the motor. You might check, some had a 10 year warranty on the motor. If you are the original owner and only have had it 5 years, then it may be covered.