Bissell 3920 Bagless Upright Vacuum\015 The height adjustment dial turns but the adjusting is`nt happening. turned vacuum over and put pressure on plate while turning dial and the plate is not moving. any ideas?\015
How to Identify and Fix Common Vacuum Problems ?
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As I said, in 2021 the highest threshold a robot vacuum can clim is ¾” or 19 mm, but it really depends on the robot and how good they are at navigating.
Sometimes pieces of string or other objects get wrapped around your vacuum`s rotating brush or around the wheels of the vacuum. Unplug your vacuum. Turn it over and have a look at the wheels and brush. If you see any pieces of string or objects lodged there, remove them.
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.Inevitably you’ll have to remove the sole plate and/or the rotary dial which may be screwed down. If it has cracked then you may have to seek a replacement. .
.Dont forget to rate this suggestion.
.Step on the handle release, pull the handle back and lay the vac on its side. Then you can get the knob and the plate back together again.
.BTW, the reason I had this problem is because the front brush slows dramatically when using on carpet, I thought it was set too low, and turned the knob (in a manly fashion, putting it past its limit). Still working on that one. After inspecting the belt, looks like one worn and cracked spot gumming up the works.
.This is the pdf manual. If you look at page 12 you’ll see that the bottom of the machine has been pictured. Between the middle wheels near the brush (where arrows 4 and 2 are) you’ll find that the adjuster bar has a sprung mechanism. Now this is easy if you have time! If you take off the or just inspect the bar, check to see that nothing is clogged behind it. If it looks fine, check with your other hand by moving the rotary dial a couple of times and your other hand pressed down on the central bar between the wheels – if you can feel that the bar is moving whilst you turn the rotary dial then it should be working. Sometimes the spring that connects the dial to the bar can loosen and this may well have been the case. If you can unscrew the assembly do it gently as it will pop up to see if the spring has been put in place and then carefully put everything back together.
.Some uprights don’t allow the height adjuster to adjust whilst in the upright position though but if it doesn’t adjust at all then the spring has definately moved.
.On some Hoovers, therte is a ratchet petal on the right side. The ones I have seen are similar in operation to the above.
.Let me know if this helps you.
.If this doesn’t solve the problem, the next possibility is that a spring has broken in the clutch/sensor device where the two drive belts meet. That will cause the sensor to “think” there’s more drag on the brush than there actually is, and hence to raise the height as before. This clutch (which isn’t really a clutch) has two toothed pulley wheels – one driven by the belt from the motor, the other driving the brush roll. Holding one wheel stationary, the other can be rotated slightly and there should be increasing resistance to that rotation. If the spring has broken there will be no resistance until you reach the limit stop. Unfortunately, if you’ve no experience of these units, it can be really difficult to know whether one is broken or not! The third possibility – failed circuit board – is, in my experience, the least likely. These are typically extremely reliable, and will usually last the life of the machine (25 years or more). I’ve never known one fail, but it’s always possible..
.I hope this helps. Any questions, just post here again and I’ll do what I can. Please remember to rate this response. Thanks!