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PGP Thread Leak Failure

Discussion in 'Irrigation' started by dhess, Jul 21, 2008.

  1. dhess

    dhess LawnSite Member
    Messages: 126

    I've replaced around 100 rotor heads on one of our larger properties.

    Most of the replacements have been due to gear failure (no longer turning, or unable to adjust) but the some are usually leaking rotors. Sometimes at the joints, but...

    here is what I'm running into on the leaking rotors.


    notice the leaking from the screw on top. Teflon isn't fixing this. Just curious if anyone has some words of wisdom on this other than these rotors suxor.

    These heads are probably from initial install so they may be 5-8 years old.
  2. Mike Leary

    Mike Leary LawnSite Fanatic
    Messages: 23,155

    They are fairly new as they've got the rubber top, I've had that problem with RB 1800,
    most of the time mower & string trim fault. What do the guts/threads look like when
    you take them apart? Looks like you're wearing the right shoewear.
  3. dhess

    dhess LawnSite Member
    Messages: 126

    I'll have my pop take a look at some since hes the mechanical engineer.

    Mower failure, NAW ;) no mowers breaking heads here!

    I have a bag full I'll take a closer look at. I'm wondering if I can send them back to get a refund though :) :)

    I tried to string one up with teflon and it still leaked and even tried to see if I could just stick a new head in the old housing, still leaked.

    So I'm wondering if they are expanding or getting crushed from mowers, weather ect..
  4. dhess

    dhess LawnSite Member
    Messages: 126

    Mike any idea when they started using the rubber tops then?

    This is new account to use within the past 2 years and first time I've replaced these heads.

    I've been using the ripoff Irritrol PGP lookalike (hope I don't regret that down the line).
  5. dhess

    dhess LawnSite Member
    Messages: 126

    took a few heads out to our testing facility :cool2:

    without teflon (a rotor that I replaced)


    and with teflon and some SERIOUS turning with plyers..


    so I was wrong about the teflon working though I have to tighten the head an extreme amount which can't be good.

    So the dilemia, do you spend time digging out leaking heads then wrapping them up with teflon then re-running the system and HOPE that it fixed the problem...

    or do you just replace the head totally.

    I say if I have to dig out a head/rotor then I replace it unless it is brand new.
  6. Bigred350

    Bigred350 LawnSite Senior Member
    Messages: 810

  7. WalkGood

    WalkGood LawnSite Bronze Member
    Messages: 1,910

    Are they missing the rubber gasket?

    Is that a total brand new head (cannister too)? Some of the older cannisters cannot work with the new guts cap.... but I think you are dealing with brand new out of the box heads as replacements that are leaking too?
  8. Mike Leary

    Mike Leary LawnSite Fanatic
    Messages: 23,155

    Maybe ten years.
  9. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Messages: 50,569

    Close to 15 years now with rubber tops. Under-cap leaks are one mode of PGP failure. Unless you installed the heads yourself, I wouldn't take a whole lot of stock in what you see on one particular system. The PGPs are date-coded, by the way.
  10. AI Inc

    AI Inc LawnSite Fanatic
    Messages: 26,987

    I was having a lot of this problem at the begining of the yr. Al,l leak in the same spot. All had 07 manufactur date. None seem to be doing it anymore. Hunter rep hasnt said what it was but I think they found the cure.

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