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Your vacuum is at least 10 years old. There are some inexpensive parts that can wear or may need adjustment. You have a very durable vacuum that may have many more years of life but Just like a car, needs to be serviced by a trained qualified technician who knows what to look for. It will save you money I the long run.
I know nothing about your particular vacuum, but many vacuum cleaners these days have
safety cut out's, which causes the motor to do exactly what you describe. Sadly blockages, faulty switches, over stretched cables, carbon brushes etc could also give similar symptoms, so sounds like a job for the repairer on this occasion. Get a quote first if you can.
There is a part under the knob that adjusts from bare floor to carpet that goes bad on these vacuums. I have an animal that is about 3 or 4 years old and I had it repaired last year( to the tune of $115.00), and it broke again in December, so I just bought a new one, tired of paying high repair cost!!
Have you ever replaced the belt? That is most likely the reason that it is not picking up like it used to. You are actually supposed to change the belt yearly. Here is the belt you need and the manual which has instructions:
Reading of another poster's similar issue caused me to realize there was indeed a third filter in this bagless vacuum cleaner. It was saturated with thick dust that was difficult to remove. Cleaning it cured the problem and I will know better next time to read my manual when I purchase a new item.
I do agree with other readers though that this particular vacuum is not savvy when it comes to picking up dog hair. It would rather push it around for a while then do the job right.
There is a thermal fuse on the motor field that sometimes fails. Sometimes the fuse does what it is supposed to do - prevents motor from overheating. Causes: a) Improperly worn motor brushes b) bad motor bearings (that usually leads to uneven motor brush wear) c) very dirty cooling air filter
To access filter and the motor - use small flat screwdriver to remove clear side panels. You will see 4 or 6 Phillips screws. Remove screws - cap will come off.
4 possible reasons. 1 – one or both bearings are worn so armature (rotating part) wobbles as it is spinning and cause motor brushes to wear fast. Solution – change bearings too. 2 – Whoever replaced brushes – did not use some brush seating sticks to make cmutator smother and contour brushes to the shape of the comutator (not likely). Solution – appropriately install new set of brushes. 3 – Comutator is so warped that seating sticks do not help anymore – solution – new armature or turn the old armature. 4 – The fact that ONLY ONE brush was worn may mean that there is something wrong with the brush or housing. Maybe it could not move freely within the housing? I think this may be most likely cause it it may be a combination of all 4.Is it worth to fix? Hmm depends how much will it be. If this is 100+ - I’d say get newer Kirby for 300 ad enjoy the tech drive (Heritage does not have tech drive so it is much harder to vacuum with than the newer models)