Exhaust Fan Impeller removal & replacement


#1

Just a quick note to those that haven’t (yet) removed their Exhaust Fan Impeller for cleaning. The Bullet manual is very thin on information about removing and replacing the Exhaust Impeller Fan.

Removal is easy and cleaning is not just a simple soak in some diluted Urnex. Some in-between the blades scrubbing is necessary to get the gunk that traps at the bases of the fan blades. I used what is often referred to as a “straw brush” to get in-between the blades and clean them completely. That kind of brush is about the diameter of a large plastic straw that is commonly sold with drink bottles. It fits between the blades without forcing them to bend or deform.

Replacing the Fan Impeller is as easy as it is to get off with one important word to the wise. Don’t push the Impeller all the way back as far as it will go when you reinstall it. It will touch the surface behind it enough that it will not allow the Impeller to rotate. Instead pull it forward enough such it spins freely, but does not extend beyond the outside flange where the Impeller fits through.

If the Impeller doesn’t spin freely, you will get a “A-01” error which correctly means the Exhaust Fan is not turning. How do I know this…? :stuck_out_tongue_winking_eye: The odd thing is that the Bullet does not check the Exhaust Fan until the roaster has completely Preheated, the “Charge” statement is issued and it goes into “The Roast has started” mode. I really think the Bullet should check to see that the Exhaust Fan is spinning upon completing the start-up checks before saying “The Bullet is ready”. Clearly if that Exhaust Fan is not able to spin, the Bullet is not ready.


#2

Thanks for the tips. I’m about ready to clean mine.


#3

Where can I find how to remove the fan? Just pull it off? Is there somewhere a video available?


#4

Sweet Marias has a YouTube video on “replacing the impeller fan” - except you won’t be replacing it. There’s a small hex grub screw holding it on so don’t yank it off with big pliers :wink:


#5

@bertje1959 - After you remove the chaff collector, you can access the Exhaust Fan Impeller. If you look straight down through the exhaust exit (above the Impeller) and turn the Fan by hand you will see one of the Fan blades that has an access hole cut into it for access to the Set Screw. Looking through that hole in the blade, you will be looking directly at the Set Screw that holds the Impeller to the Fan Motor shaft. Aillio supplies a hex-head tool that will fit that Set Screw.

Turn the Screw counter-clockwise and loosen it just enough that the Impeller is allowed to slide off the Fan Motor shaft. There is no need to fully remove the set screw to remove the Impeller. You may find (as I did on my Bullet) that the Impeller slightly hits the top outside edge of the case frame surrounding it as you try to slide it straight out. I had to finagle mine a bit at that point to get it to slide completely out.

For a visual (video) there is this one where Julio (of Sweet Marias) removes and installs the Impeller:
Impeller Fan removal and replacement


#6

Seen it. Thanks!