Erattic behaviour from da air sander

  1. julianf

    julianf Member

    Messages:
    3,562
    Location:
    devon, uk
    I have a mirka air sander.

    It's behaviour is erratic. Sometimes it works fine for ages. But other times it works, then slows right down, speeds up again. Sometimes I push the trigger and it won't even spin.

    This seems entire independent of air supply. And, yes, I put some oil down the air inlet before every use.

    It requires a special tool (that I don't have) to open it up.

    Does the behaviour sound familiar to anyone?

    Thank you
     
  2. 123hotchef Member

    Messages:
    6,031
    Location:
    Kent
    my die grinder did that too i put it down to cheap carp
     
  3. RWD3M Member

    Messages:
    162
    Location:
    Wiltshire, UK
    Hmm.. this is a bit of a long shot but I had similar symptoms on my Craftsman D/A and eventually discovered that it had it's own air control valve that had worked a little loose and was restricting, quite randomly, the airflow. Tightened up and adjusted, now works perfectly.

    Good luck.
     
    123hotchef likes this.
  4. 123hotchef Member

    Messages:
    6,031
    Location:
    Kent
    someone told me to put a shot of derv through the air intake to clean it out that worked on my ratchet for a while
     
  5. postie jon Member

    Messages:
    698
    Location:
    Aberdeenshire, Scotland
    probably dust and oil combined into a paste inside , good strip down and wash with degreaser ,will prob cure it , our old sanders were allways clogged up.
     
  6. Craig-SM New Member

    Messages:
    37
    Location:
    Leeds
    ^ this
     
  7. 8ob

    8ob Member

    Messages:
    3,064
    Location:
    moscow on thames
    Dont know about the da but nut guns can freeze , give them a few minutes and they are away again. Probably down to a tad of moisture in the system but we do get this.

    Bob
     
    123hotchef likes this.
  8. julianf

    julianf Member

    Messages:
    3,562
    Location:
    devon, uk
    This is kind of what I suspect. But as I say I can't even get I to it at present.

    I'll have another look and see if I can't make the required tool, as I suspect it costs about as much new as I paid for the sander : /

    I purchased a 1/2 gun from the boot sale once. Stripped that, freed the vanes, and it's been fine ever since. But that one just did not work at all. This one works spot on one day and is an arse another.
     
  9. slim_boy_fat

    slim_boy_fat Forum Supporter

    Would a run through an ultrasonic cleaner do the job without dismantling - or perhaps it wouldn't like total immersion? :dontknow:
     
  10. fizzy Member

    Messages:
    3,586
    uk
    Perhaps total immersion in Kero? Leave it soak for a while. Could cause O rings to swell though.
     
  11. brightspark

    brightspark Member

    Messages:
    24,967
    Location:
    yarm
    just shot a load of wd40 through it and run it on high pressure the vanes might be gummed up or the bearings it has worked on a couple I got cheap :laughing:
     
Advertisements