I really like the Bauer handheld vac - I had the earlier "Hercules" version but can't remember why it stopped working. The Hercules did not have a hose attachment but with the hose attachment you can reach into back spots to vac - using the wand suction attachment.
As I searched for the impeller blade on the Bauer 3.5 gallon vac DC motor - handheld - I was pondering what it looked like...I could find no image (see above image from manual) as apparently no one has taken their Bauer 3.5 gallon vac apart to oil the bearings? I took it apart and put it back together and it works - but I forgot to really study HOW it works!! hahaha. I didn't realize that the vanes have to face the motor - very fascinating. And that they turn 30,000 rpm!! Wow.
The required voltage depends entirely on the motor's K_{v} rating (its velocity constant, measured in RPM per volt). For example, a motor with a 2,000 Kv rating requires 15 V to reach 30,000 RPM under no-load conditions,
So that fits the 20 volt battery...Anyway I did find this new attachment that someone designed - to insert a vacuum bag into the Bauer! Very exciting - because I just bought a new filter and those things are over $20 but they are impossible to clean. A vacuum bag meanwhile is cheap and easy to dispose of. Wow - I really like this handheld vacuum except that the wand attachment scuffs up the floor (you have to be very careful with that black plastic as it smears off onto the linoleum).
To stop your vacuum wand attachment from scuffing your linoleum, use a dedicated hard floor brush...BAUER Micro-Cleaning Accessory Kit for Wet/Dry Vacuums, 9-Piece
AI tells me that it was critical I got the impeller blade installed with the vanes facing upward. To be honest - I don't remember seeing any vanes but I know the side facing downward is smooth, so I can only assume there are vanes on the motor facing side - the vacuum indeed is back to its normal LOUD self (not an insanely loud screaming sound). I did oil the bearings after watching a youtube vid on how to oil vacuum motor bearings for a handheld shop vac...
that only allowed for a 1.5 gal bag.
That's good enough for me....

This adapter for my Bauer cordless vacuum really fit well, not too tight and not too loose! I also didn't have any trouble installing the vacuum bag. They really did a good job making it! I hesitated to spend this much on an adapter, a bag, and shipping. But in the long run this will save me a lot of time! I found myself cleaning the filter every time I used the vacuum, even for a short time. Most of the dust would be on the filter and very little in the tank. Seller also did a great job shipping, it shipped right away and arrived quickly!
Reaching 30,000 RPM typically requires Brushless DC (BLDC) motors
yeah the review said it's a brushless motor...
When the Motor sound becomes higher in pitch, the Tank is full and the float is closing off the motor intake.
No - what happened is that I used it to suck up water and the water dried out the motor bearings and the sound became a SCREAMING high pitch...
A 30,000 RPM vacuum motor screaming at a high pitch is a classic symptom of failing, seized, or unlubricated bearings. At these extreme speeds, a dry or dusty bearing will emit a piercing shriek. Continuing to run the motor will rapidly cause the bearing to melt, fuse, or self-destruct....
So no more screaming of the motor bearings!!
I also fixed/replaced the oven heat element and the dripping faucet...
So I've been pretty handy around the house in the past couple weeks.
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