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Maxi/Mini Paw's rotating slowly

Discussion in 'Irrigation' started by Dirty Water, Oct 8, 2005.

  1. Dirty Water

    Dirty Water LawnSite Fanatic
    Posts: 6,799

    I just did a quick renovation call for a landscaper that is redoing a 20 year old landscape.

    Added two drip zones, moved a bunch of heads..the usual. Anyways, I found about 5 impact sprinklers that refused to move (they would hammer away, but not go anywhere).

    I didn't feel like messing with them, so I replaced them for rotors...Any idea why they would do that?
  2. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 47,673

    Could be dirt or debris. It might also just be worn out bearing washers. A certain amount of bearing friction is necessary for an impact head to work. Without it, there will be no rotation. I remember old brass impact heads with the same problem. Makes you say "Hmmmmm" the first time you see it.
  3. Grassmechanic

    Grassmechanic LawnSite Silver Member
    Posts: 2,697

    As Wet Boots said it could be a bearing washer. Or a small stone in the impact arm. Or a burr on the part that the impact rotates on.
  4. Ground Master

    Ground Master LawnSite Senior Member
    Posts: 505

    could also be low pressure on these zones-----possible leak from the renovation?
  5. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 47,673

    Sometimes, with brass impact heads, you would see the non-rotating impact heads when a homeowner noticed that the reversing trip mechanism was sticking, and got the bright idea of getting out the good ol' can of WD-40 ~ if only the trip mechanism got sprayed, all well and good, but if the spray got into the spindle bearing washers, and eliminated the friction, good-bye impact head.

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