Thread Number: 38313  /  Tag: Recent Vacuum Cleaners from past 20 years
Simplicity Synergy Problem
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Post# 407721   4/6/2019 at 23:44 (358 days old) by vacmaster (Southern California)        

Hey guys. Today I got this used Simplicity G9.4 in rather good condition for $100 off of Facebook marketplace, however an issue has arisen. When the direct air motor is activated, there seems to be a vibrating or rattling noise that is not present in the upright position or when the direct air motor is deactivated. It sounds almost like a vibrating fan or brush roll, however as I am not well versed with the mechanics of these machines I am unsure. The brush strips are loose in the aluminum housing, however I do not believe this is the cause, but I cant be sure. I have linked a video I made of the vacuum below so you can see for yourself what I am talking about. Any help would be greatly appreciated, as this has been one of my dream vacuums for a while and I would like to be able to use it without worry. Thank you.


Post# 407728 , Reply# 1   4/7/2019 at 09:52 (357 days old) by Kirbysthebest (Wichita, KS)        
From what you described

kirbysthebest's profile picture
It sounds like you have a broken fan on your direct air motor.

Post# 407732 , Reply# 2   4/7/2019 at 12:23 (357 days old) by vacmaster (Southern California)        

I checked the fan and it was intact, however it had 9 concave blades instead of 7 flat blades. Odd.

Post# 407737 , Reply# 3   4/7/2019 at 14:45 (357 days old) by Holeefuk (Chai-nar qualitee...anything more = ip theft)        

holeefuk's profile picture
9 blade fans are the old g9 and radp

Vibrating and loose ingest bars or bottom plate (the brushes do make contact with the bars which can lead to vibration and noise).

Post# 407739 , Reply# 4   4/7/2019 at 14:55 (357 days old) by Blackheart (North Dakota)        

blackheart's profile picture
If you haven't already check the endcaps where the bearings sit make sure there's no play around the bearings. I've seen one or two older models where the space around the bearings had worn allowing the brush to vibrate. Might not be your issue but it never hurts to check.

Post# 407741 , Reply# 5   4/7/2019 at 15:21 (357 days old) by Vacmaster (Southern California)        

This video is much better. You can hear the sound much clearer


Post# 407743 , Reply# 6   4/7/2019 at 16:59 (357 days old) by vacmaster (Southern California)        

It is definitely a motor issue. The sound persists even when the brush roll and belt are removed from the motor.

Post# 407744 , Reply# 7   4/7/2019 at 17:13 (357 days old) by Blackheart (North Dakota)        

blackheart's profile picture
That's an odd noise I'd open it up and wire the direct air motor directly. It almost sounds like it's arcing in that video.

Post# 407745 , Reply# 8   4/7/2019 at 18:10 (357 days old) by vacmaster (Southern California)        

I was thinking that, but wouldn't there be a loss of some brush roll power and surging of the bypass motor? I think that no matter what happens at this point that I need to replace the direct air motor. Does anyone know where I can source this part for a reasonable price? I really want to love this vacuum but it's a little bit hard to right now.

Post# 407746 , Reply# 9   4/7/2019 at 18:28 (357 days old) by Blackheart (North Dakota)        

blackheart's profile picture
Typically motors that are arcing spin a little slower i'm unsure if it's torque would be effected but it's possible. I don't think the Bypass motor would surge though since it'd just be the direct air motor with the issue.

As for getting a replacement. I'd check with a dealer, or perhaps a vacuumland member who has connections to Tacony. I've noticed that sites like partswarehouse charge MSRP and dealers often charge less.

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