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Author Topic: DC 39 motor pulses, no suction  (Read 2718 times)

Offline ianc

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DC 39 motor pulses, no suction
« on: December 20, 2021, 08:06:20 am »
My DC39 has good suction with the canister removed (hand over inlet good vacuum). But with canister there is no suction and motor or suction sound "pulses" .
I cannot find any blockages.
Any suggestions on what to look for?
thanks

Offline dysondestijl

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Re: DC 39 motor pulses, no suction
« Reply #1 on: December 20, 2021, 12:21:22 pm »
Underneath where the canister sits, there is a small, narrow piece of flexible hose. They always block up there. Check that. Alternatively the filter might be clogged solid. Give it a thorough wash

Offline ianc

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Re: DC 39 motor pulses, no suction
« Reply #2 on: December 22, 2021, 09:23:59 am »
Thanks. Not the flexible hose below canister (I have cleaned a lot of them!). Also, seems to not be the filter, I washed that thoroughly to start with.
So I tried a DC54 canister on the DC39 - good suction, no pulsing. Then tried the DC39 canister on the DC54 - worked with no pulsing. BUT the DC39 with DC39 canister still pulses. I might have to disassemble the DC39 canister.

Offline ianc

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Re: DC 39 motor pulses, no suction
« Reply #3 on: January 05, 2022, 06:52:08 am »
I now think it might be the filter. I washed it until nothing more came out, with no improvement. I then cleaned it with vinegar and bicarbonate of soda. A lot more dirt was removed. I think it may have been used for plaster dust or similar. It worked better after the second clean. I am now waiting for a new filter to see what happens.

Offline dysondestijl

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Re: DC 39 motor pulses, no suction
« Reply #4 on: January 10, 2022, 07:47:04 pm »
Sounds like you might have found it. Knew it would be something simple like that. Filters can look clean but hide a lot of fine dust internally.

Offline ianc

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Re: DC 39 motor pulses, no suction
« Reply #5 on: September 18, 2022, 04:48:35 am »
Actually not the filter, it still pulses with a new filter.  The Suction feels sine with no canister, but the pulsing occurs with cannister in place. Perhaps too much resistance then. I may need to look inside.

Offline MVacs

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Re: DC 39 motor pulses, no suction
« Reply #6 on: October 07, 2022, 01:22:11 pm »
If its been used for plaster dust, it will probably want the cyclone stripping and washing.

Offline ianc

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Re: DC 39 motor pulses, no suction
« Reply #7 on: October 07, 2022, 09:23:06 pm »
A new filter did improve it but not fully. I have tried other cyclones that work on other machines, and its cyclone works on other machines, so it is not that.
I am not sure if this model has a by-pass valve or an internal filter around the motor. If so it could be either of those.

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