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'85 Whisper Chipper, new bearings and gapped but still not feeding well

Discussion in 'Large Equipment' started by hellpcangel911, Oct 1, 2018.

  1. hellpcangel911

    hellpcangel911 ArboristSite Lurker

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    Hi All,
    I've been going through the forums while rebuilding a recently purchased 12" drum Asplundh whisper chipper. I picked it up last year and it worked well, but often would have to throw the same branch in a few times to get it to disappear. I used it around the farm quite a bit but at one point I was just getting too frustrated having to keep putting the same branch in before it would chip part of it, then again...and again.
    Based on the research here I figured it was the knives or the gap. One bearing was howling so I decided to replace both and start from scratch.
    I got the new bearings in, and set the cutter bar 7/32" from the rotor. Then I installed the blades to be about .030 from the bar. After I torqued everything down I found the gap between the knife and bar was .026 so I moved the cutter bar down to get .028 which from other posts on here makes for an aggressive cut. I am the only one that uses this machine and its just for our property so if it doesnt get much use.
    After all that work I fired it up in anticipation and it was disappointing to see some improvement but not much. The chips are about half the size of what they were before, the Ford 300 doesnt bog down at all as it ripped some 5" red oak, but it also only got through half of the 7' long bare branch.

    What did I do wrong? I flipped the cutter bar to a new side, the blades all looked good and quite sharp (they were replaced a while before I bought the machine), a few little nicks but all and all a good edge.

    I'd like to get it to the point where i can toss the branch in and it disappears while i go get the next one...chuck and duck. Any help would be much appreciated.

    Thanks,
    George
     
  2. hellpcangel911

    hellpcangel911 ArboristSite Lurker

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    added some photos to better illustrate the chips im getting. Any help?
    chips 2.JPG chips 1.JPG
     
  3. hellpcangel911

    hellpcangel911 ArboristSite Lurker

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    bump for help?
     
  4. agvg

    agvg ArboristSite Operative

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    Sure you have the right angle on the blades? If the angle is wrong it will not feed it self.

    Sent fra min Nexus 5X via Tapatalk
     
  5. nk14zp

    nk14zp ArboristSite Guru Staff Member

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    Knives sharp? Dull knives are worse than a dull chain.
     
  6. hellpcangel911

    hellpcangel911 ArboristSite Lurker

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    Unfortunately, yes. they have a 40 degree face. But good question. They havent been resharpened since they were bought new and seen little use. I'm seeing like $140 to buy new ones from Baileys which is about what it would cost to sharpen these locally. I might just buy new ones and rule that out.
    Is there anything else to check?
     
  7. hellpcangel911

    hellpcangel911 ArboristSite Lurker

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    knives are sharp, not enough to shave hairs but no burrs or chips, comes to a fine edge.
     
  8. agvg

    agvg ArboristSite Operative

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    If they are sharp and still doesn't feed I would have checked that the angle you have is correct for the chipper.

    Sent fra min Nexus 5X via Tapatalk
     
  9. nk14zp

    nk14zp ArboristSite Guru Staff Member

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  10. nk14zp

    nk14zp ArboristSite Guru Staff Member

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    In a disk chipper you want them sharp enough to shave if you are selling high grade chips. Not sure on a drum.
     
  11. nk14zp

    nk14zp ArboristSite Guru Staff Member

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    You car sharpen your own with a drill press.
     
  12. hellpcangel911

    hellpcangel911 ArboristSite Lurker

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    nk14zp, thanks for the link, that was actually the thread I found before that led me to leave it as a .028 gap even though the manual calls for .030-.035
    can you elaborate on how to sharpen them on the drill press? where would you recommend getting a new set?
     
  13. nk14zp

    nk14zp ArboristSite Guru Staff Member

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  14. nk14zp

    nk14zp ArboristSite Guru Staff Member

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    The critical part is the angle the knife is ground to for it to self feed.
     
  15. hellpcangel911

    hellpcangel911 ArboristSite Lurker

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    Pulled the blades and dropped them off for a sharpening... WhatsApp Image 2018-10-09 at 10.27.59 PM.jpeg WhatsApp Image 2018-10-09 at 10.27.50 PM.jpeg
     

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