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When a Hoover Windtunnel becomes hard to push, this usually indicates that self-propelled has stopped working.
When this stops working, it can be caused by several things. The first, most common problem is that the belts have either broken, or stretched to a point where they no longer engage the self-propelled mechanism. In order to verify this, simply make sure that the machine is set to the Carpet setting, turn the machine on, and turn it over on it's side with the handle release pedal reclined (make sure it's not in the upright position). Is the brush at the bottom of the vacuum spinning? If no, this definitely indicates that your belts have gone bad and need to be replaced. There are two belts on your machine, one controls the brush, the other controls the self-propelled mechanism. We've shot a helpful video that walks you through step by step on how to replace the belts.
This is by far the most common problem that we see on your particular model:
The other problem if the belts are installed properly that would cause
the self-propelled wouldn't work would be the self-propelled actuator
arm. There is a cable that starts at the handle of the vacuum, and
runs all the way down to the floor head of the vacuum that controls the
transmission. As you pull backwards on the handle of the vacuum, the
cable pulls this actuator arm backwards, which then turns the wheels
backwards, and when you push forward it turns the wheels forward.
problem with the way it's designed however, is that if you pick up the
vacuum cleaner by the handle of the machine rather then using the
carrying handle on the back of the vacuum, it causes too much tension on
the actuator arm, and will cause the cable to rip right out of the arm.
is a VERY common problem on this model. To check and see if this part
is broken on your vacuum, step on the handle release pedal so that the
handle is in the vacuuming position, push the pedal a second time so the
machine lays flat on the floor.
Now if you look right behind
the height adjustment switch, and the rug / floor switch where the floor
part meets the upright part, you should see a cable that connects into
the actuator arm. Pull up and down on the handle and look for
movement. Is the cable loose with only a nut attached to it, or is it
resting in the actuator arm?
If this didn't help you,
and the problem is still happening, please just use the add a comment
form here on Fixya and let me know that you're still having problems.
I'd be honored to go through and do some more advanced diagnosing with
I hope this we helpful to you. If you did find this
helpful, please be so kind and leave feedback for me. This is why
repair professionals like myself continue to come back and give free
repair advice, to get the recognition of a job well done.
Your self propel wire could be broken. Lean the vacuum back like you were using it. If you stand in front of the vacuum look down and to your left. When you move the selp propel button you should see a wire move. If not then it's broken.
There should be a belt tensioner for the V belt, maybe it is not contacting the belt when you tilt the handle back. If this is less then 1 year old, then it is under warranty, take it in to a warranty servicer for warranty repair.
Most likely the flat belt has stretched enough so as to not turn the pulley that in turn turns the brush roll using a V belt. Also there is a small idler wheel, if hook up, then it won't engage the V belt.
Might be that the the idler wheel is stuck and not engaging the V belt. If you look down just past the V belt you will see a black roller, it needs to be against the belt. It is either stuck or the asm. is broken.
There is a idler wheel that will drive the V belt, sometimes they jam and you just have to reach in, push and make sure if comes in contact with the belt. Alot of times tho it is the other flat belt, 38528035 that will stretch and can cause you to have problems with the brush roll not turning.
You didn;'t say what the problem is, but I assume that the brush roll is not turning. Take of the cover over the brush roll, then you can get to the brush roll and the belt. The belt probably came off or broke. Best to replace the belt.