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Thread: Leaking Hunter PGP rotors

  1. #1
    DIY Member vaman's Avatar
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    Default Leaking Hunter PGP rotors

    I have some hunter pgp rotors leaking. Dug around them and each one is spraying water out sideways;looks like it's between the riser assembly and the shrub head base. What is the secret to unscrewing these things? Am I correct in thinking the screen is probably clogged?

  2. #2
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    I'm not sure from your post where your seeing water shoot out , but here goes. If it is leaking between the body and the cap, it just may be a matter of tightening the cap. It's just like tightening a jar and there are only 2-3 threads. If it is leaking between the riser (part that pops up) and the top of the cap, it may be that the seal is bad or clogged with something. Or if you have a low pressure situation , there is not enough pressure to seal the turret when it pops up and water will flush out the sides untill there is sufficient pressure.

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    Sorry, one other thing , if the problem is with 2-3 heads on the same zone I would definitely look at a pressure problem. A clogged filter basket will do it. Just unscrew the cap, pull the guts out and clean the filter if needed.

  4. #4
    DIY Member vaman's Avatar
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    Default Picture of leaking hunter PGP rotor

    The attached picture shows one of the leaking rotors.My finger is pointing to the seam where these things are leaking.I opened this one up and found nothing inside that looks like it would cause any trouble. There is a large spring in the unit;I thought these things were supposed to have some sort of filter.Am I wrong? Anyway water sprays out of the top like it supposed to but it is also gushing around the area where my finger is.Any suggestions?
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    If you are sure that the water is definitely leaking at the seam as you say, then maybe the cap is cracked.?? But the likely hood of that with multiple heads does'nt seem right. Sometimes leaks appear to be from one area but are actually originating elsewhere. When the system is operating, can you easily push down on the riser? This could mean lack of pressure. When heads first come up they are designed to "flush" water out between the riser and the seal and then "seat" after a few seconds. If there is not enough pressure under them they will continue to flush. By the way, the PGP head does not have a filter basket as some other heads do. If you take the guts out and look underneith it there is a filter screen within it. That should be clear. From your description, check loose cap,verify crack somewhere, insufficient pressure (which could come from anywhere in the system). My guess would be a water flow/ pressure problem.

  6. #6
    DIY Member vaman's Avatar
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    Default Leaking Hunter Rotors

    Turned out they are simply worn out. Am in the process of replacing all of them.

  7. #7
    DIY Junior Member cn90's Avatar
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    Quote Originally Posted by vaman View Post
    Turned out they are simply worn out. Am in the process of replacing all of them.
    Much better to replace the whole sprinkler head than just the cap.
    It is not that expensive anyway.

  8. #8
    DIY Junior Member dicka55's Avatar
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    Default Head leaks

    Don't the caps have a seal that the body slides through (or otherwise contacts)? I just extended four heads from overgrown bushes; every one is now squirting water from the cap/body interface. I do not have a pressure problem. I had removed the rotor assembly from the case to flush the system and clean the head. Does a replacement cap come with a seal? The only separate seal I see online is the rotor riser seal. My heads are 6.5 years old. Will appreciate any info that you can provide to shed light on this problem.
    Last edited by dicka55; 10-21-2009 at 12:38 PM. Reason: Error

  9. #9
    DIY Junior Member kdiekman's Avatar
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    Quote Originally Posted by dicka55 View Post
    Don't the caps have a seal that the body slides through (or otherwise contacts)? I just extended four heads from overgrown bushes; every one is now squirting water from the cap/body interface. I do not have a pressure problem. I had removed the rotor assembly from the case to flush the system and clean the head. Does a replacement cap come with a seal? The only separate seal I see online is the rotor riser seal. My heads are 6.5 years old. Will appreciate any info that you can provide to shed light on this problem.
    Iknow this is a little late but just wanted to post for reference.

    It looks to me like there isn't a gasket at the cap just a knife edge. That seems to wear and start to leak. for now I am removing the cap and putting a bead of silicone in the grove of the cap and screwing it on and letting it dry 24 hrs - seems to work. I am looking for an o-ring option for the future.

  10. #10
    Sprinkler Guy Wet_Boots's Avatar
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    the original poster's problem was covers that needed tightening - it was a problem for more than a year, and heads took awhile to start this leaking - the solution was straightforward - tighten the caps

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