Question about Dirt Devil M087700SV Bagless Upright Vacuum
While vacuuming, the self propelled feature drives in reverse when the handle is pulled but not in forward when the handle is pushed. It is also difficult to push (pushing against a dead drive train). I have turned the vacuum on it's side while running to observe the drive's action relative to the handles operation. It drives fully variable in reverse, but the motor stops when the handle is pressed forward. I dismantled the switch in the handle & did not expect the magnetic proximity type sensor. Not fully sure how best to troubleshoot the switch, I put it back together. I suspect a problem in the motor now since the switch appeared to be a three conductor proximity switch & likely fine since it detects the reverse switch movement.
I took the wires loose from the drive circuit card. Using the ohm meter to check for a broken wire, all three checked out fine. I then rigged up a set of jumpers that allowed me to jump across the terminals on the circuit board from the common to the two neutrals. Sure enough the drive motor works perfectly both forward & reverse. The magnetically sensetive transister type switch was the culprit. I have replaced the switch & it works great. I wish I could identify the transistor & only buy it & solder it in.
Posted on Jun 25, 2007
This is basically the same problem with a Hoover power drive only the forward still drives albeit slowly and a slight "push" to keep it going. There has to be a common core type of drive failure !!
Posted on Jun 04, 2007
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mine goes in reverse, if i am pushing or pulling. No forward action at all. At least i'm getting a good work out, but it's still a pain.
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