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Removing the Harman Combustion Blower? What is the best way?

Post in 'The Pellet Mill - Pellet and Multifuel Stoves' started by Don2222, Apr 29, 2013.

  1. Don2222

    Don2222 Minister of Fire

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    Salem NH
    Hello

    It seems that because the blades are not in a sealed plenum like other stoves these blowers last longer. However changing them is not as easy as removing a few nuts or screws like other stoves.

    I manually brushed the set screw with a small wire brush and sprayed PB blaster on it and left it overnight.
    Saw this post
    http://www.hearth.com/talk/threads/...wer-fan-blade-cleaning-or-removal-tips.66633/

    Have not tried a torch yet.

    The allen wrench still will not budge. When this happened on other stoves, I just cut the shaft off.

    However in this case, the set screw must come out to get the blower out.
    Because of that, I cannot get a hacksaw on the shaft. Is there any way to get a tool in there behind the blades to just cut the shaft off?

    See pics below.

    Luckily it is not noisy like this one!

    Attached Files:

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  2. Don2222

    Don2222 Minister of Fire

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    Hello

    I finally cracked it.
    What did it for me was to use a wire brush on the drill to really dig into the sides of the set screw. This stove is quite a few years old so I would assume this method will work on most stoves!
    You can get this brush at Lowes
    http://www.lowes.com/pd_445713-48246-KDT2313_4294715832__?productId=4714677&Ns=p_product_qty_sales_dollar|1&pl=1&currentURL=?Ns=p_product_qty_sales_dollar|1&facetInfo=

    Soaking with PC blaster over night still helps but digging in with the wire brush to minimze the oxidation build up is key to cracking the set screw.
    Once I loosened the set screw it all came off easily!

    See pics!

    Easy Peasy with the right stuff!

    Attached Files:

  3. Don2222

    Don2222 Minister of Fire

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    Hello

    Well, I guess you know where I go from there, but here are the pics to show!

    Knock down ash and rust with manual wire brush
    Use drill/driver wire wheel to really get it clean.
    Smooth down with emory cloth. Any ruffness in the chamber impedes air flow.
    Clean up with Acetone
    Coat sides and behind impeller with Dry Moly Spray.
    Throw on some new impeller blades when the old ones are real rusty. Again rust impedes air flow. New blades are only $25.00
    Coat both sides of new or old blades with Dry Moly Spray. Adds protection and gives a real slick surface!
    Put back with a drop of oil on the set screw and bingo. A real professional Job!
    Next time it will come off easy!

    Attached Files:

  4. Don2222

    Don2222 Minister of Fire

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    Hello

    Here is the final pic with the Combustion Intake Weldment Retainer painted flat black with VHT very high temperature for car headers.

    This is now clean, lubricated, and spray protected against more buildup!

    Attached Files:

  5. ivanhoe

    ivanhoe Feeling the Heat

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    To remove the old fan when unable to remove the set screw would be to grind the fan shaft down to as near the motor shaft. You won't be able to drill the set screw out as the metal is too hard.
  6. mepellet

    mepellet Minister of Fire

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    Looks good. I use a dab of anti seize on the set screw when I put it back in. Works good for me so far.
    Hoot23, Don2222 and heat seeker like this.
  7. heat seeker

    heat seeker Minister of Fire

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    Anti seize is our friend! I use it on almost everything!
  8. Defiant

    Defiant Vermont Castings Geek

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    Donomite!!!!!!;)
    DexterDay and Don2222 like this.
  9. DexterDay

    DexterDay Guest

    X2
  10. NixonFamily

    NixonFamily New Member

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    Thanks,
    The combustion blower on my Harman Pellet Pro Plus started making a real grinding sound.
    I have had the stove for 9 years and used it every winter, Maine winters are pretty long so the fan has really worked hard.
    I used the PB Blaster bought at Home Depot for around $4.00.
    I also bought a set of hex (Allen) keys/wrenches. the set included both metric and sae. I chose a fairly long set for better leverage.
    I used a 1/8 Allen wrench -- thanks to another thread on the forums that specified the size ;)
    [​IMG]
    You can see the new one is considerable longer than the original one I had. Better leverage and between this and the PB blaster, the set screw came out pretty easily.

    I thought I would add this comment in case anybody else has the same problem.
    Don't forget to remove the blower cover and latch first.
    Thanks to all at Hearth.com, my new combustion blower is on the way and I am ready to reinstall, thankfully this was at the end of the season not right in the middle.
  11. gfreek

    gfreek Minister of Fire

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    Just don't use too much, screws will loosen on their own
  12. Don2222

    Don2222 Minister of Fire

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    Did you get the upgraded 1.75 amp motor or the old 1.5 amp job?
  13. NixonFamily

    NixonFamily New Member

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    i believe the 1.75 upgraded. I queried whether the circuit board would have to be upgraded to handle the increased amperage and they said "no". Hoping they are right.
  14. fedtime

    fedtime Member

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    Don - I had the same problem with my Accentra (older model, bought used). Solution? Penetrating oil did not work, so I used a propane torch (all I have) to heat the set screw, used a looong Allen wrench, and "BANG" it broke free.

    As others have said, I use anti-seize compound on just about everything on my stoves - a small amount is all that is needed.

    I got the upgraded motor and fit was a bit of an issue - the wiring harness was a problem - but I sorted it out.
  15. NixonFamily

    NixonFamily New Member

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    I ordered the aftermarket part - it claims to be appropriate part for the P38+

    [​IMG]
    Hopefully its a good fit, from the image it seems like it should
  16. gfreek

    gfreek Minister of Fire

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    Where did you order from ??
  17. NixonFamily

    NixonFamily New Member

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    Pellet stove parts 4 less dot com
  18. Don2222

    Don2222 Minister of Fire

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    Attached Files:

  19. NixonFamily

    NixonFamily New Member

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    Don,
    Will the aftermarket fit and work efficiently?
  20. Don2222

    Don2222 Minister of Fire

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    Hello
    Yes it will fit and work fine. :)
  21. ZBrooks

    ZBrooks Member

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    Don - I watched a youtube video of yours concerning dry moly lube and some other lube that you sprayed on a couple fan blades. Do you actually spray either of those onto the fan blades before reinstalling them in the stove or was that just for show?
  22. Don2222

    Don2222 Minister of Fire

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    Yes, I spray them and then install them into the stove. It protects them against rusting and ash buildup. I also spray the augers and auger chutes too!

    See
    http://www.hearth.com/talk/threads/...er-service-auger-jam-fix.126216/#post-1694828
    Also See
    http://www.hearth.com/talk/threads/...-burs-pimp-my-auger-pics.102423/#post-1320543
    Last edited: Mar 31, 2014
    ZBrooks likes this.

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