Replacing spring in wheel height adjustment

Take it to your local Sebo dealer for repair. Sounds like the servo has gone bad.

There are (4) main components that affect the height adjustment on your vacuum. They are: Brush roller, Servo Motor, Control board, and Sensor pulley. You have eliminated two of the possibilities already. I would ask you if either of the height adjustment lights on the PC board come on, indicating that the board is attempting to raise or lower the vacuum. I would also have you inspect the Sensor Pulley. That is the yellow pulley that both belts connect to. Do the two sections of the Sensor turn easily without resistance? Do they spring back when released? Are the magnets (small black round magnets on the inside of the Sensor wheels) still in place? That Sensor pulley system tells the PC board whether or not the vacuum needs more or less resistance (to raise or lower the servo motor). Because the Sensor Pulley is completely mechanical (no electrical components); If this Sensor pulley is completely functional, your problem is likely the PC board. I have included some links to the PC board and Sensor pulley for your convenience. Hopefully this helps. 5465 Red Ring Windsor Sensor 86145060 5740 ER Computer Controller Windsor Sensor SR XP 86140160

Yes it is the cam actuator spring. It keeps tension on the height adjustment wheels. Hope this helps.

That spring connects to a slot beside the height adjuster knob and a hole in the base to the wheels that fell off.The problem is you can't get the wheels to go back in flush so the height adjustment works.The vacuum will not be close enough to the floor to get any type up suction or brush contact.To change that spring as well as the belt,remove the cover by taking out two screws,one on each side.Force the rller out by prying the right end out of the slot.

Worst case scenario is that there's a fault on the circuit board, but another possibility is that the brush roll is not rotating freely. The automatic height adjustment works by sensing the drag on the brush roll, and altering the height to maintain constant drag. So, if the brush roll is sticking, the sensor detects the extra drag and raises the height accordingly. First thing to do, then, is remove the brush roll and remove any hair (the most common problem) or other stuff that may be wound round it - especially at the ends near the bearings. Check that the brush roll is able to rotate freely.
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!

Remove the nozzle and remove the front wheel shaft. Take these 2 screws out.


When doing so - watch for the spring that is under the top pedal, do not let it fly out of window. If you will find that shaft is bent buy and install a new shaft (you can find all parts HERE). You may try to straighten it but usually it doe not last long - wheel ***** falls off and you have to buy new shaft anyway. If shaft seems to be ok - clean old grease and dirt, lubricate well the pedal teeth and assemble everything back. This should solve the problem. Occasionally spring may be broken but this happens very rarely.

Good Luck,
Rocky
:-)

There should be a place easily for the wheel assy to fit back in and then if you look you should see 2 small holes in the bottom of the vacuum that it will slip into. If your looking at the vacuum straight they should be on the left side on the bottom.

It sounds like you have a roller problem. This machine has a carbon fibre roller suspended on plastic end caps. When dirt and hair etc. gets in and damage the bearings, the belt will be the first thing to go. If the roller is noisy, that indicates that it is off centre and is rotating unevenly. You will probably have to replace the roller.
Take the belt off and rotate the roller slowly and observe the ends. If it is off balance, it will not rotate evenly. The plastic caps unscrew to reveal the brngs and usually you will find hair and other junk gumming up the works. If the roller is damaged, you will be able to see melted plastic and chards of carbon fibre there.

The height adjust mech. has 2 tabs, that you have to unlock, It also is easier when you tip the power head so as not to puit pressure on the Ht. Adj. wheels. Use a flat blade screwdriver and if you look down bertween the ht. adj. mech. and the elboe where the wire is, you should be able to see the 2 tabs, just pry it away form the elbow and it will come off. When you put it back on, make sure all wires are routed where they were and tip powerhead, it will snap into place.

In addition to the tab that contacts the bottom of the slider, there are 2 protusions on the adjustable wheel plate that move through holes in the housing, but only when the handle is tilted to begin vacuuming. The wheel plate has a spring that forces the tab against the slider. As the handle is moved to the upright position, the protusions move back through the holes, taking the tab away from the slider and the wheel plate locks in its highest position. Therefore, the position of the slider has no effect while the handle is upright and locked. Hope this helps.