Two of my Hunter PGP 4" sprinkler heads seemed to be working okay based
on the throw of the water. But I noticed both had pools of water around
their bodies, so I assumed there was a leak, perhaps around the cap, and
At one of replaced heads, there was no longer a pool around the body or
in the still-open hole. But the other one leaked a little while the zone
valve was on, but continued to leak much more when the zone valve was off!
There are five heads on this zone. Due to the slope of the lawn, the
leaky head head is downhill from the three that are closest to the
manifold valve, so I figured that maybe gravity was a factor, not that
it really should be. The leaking continued for at least 30 seconds after
the zone valve was off.
One more head, a different model with a fixed 1/4 circle pattern, is at
the bottom of the run. No pooling there.
Is my leaky, new head defective?
Two sizes, but mostly large (not 4" diameter, but maybe 4" pop-up).
I've been replacing many of them over the past few years - primarily
because they get stuck at one end of their rotation pattern and just sit
there and click unless I give them a tweak by hand and then they'll make
one sweep and come back to the same position and sit there.
Has anyone ever taken these apart to see if any gears can be cleaned or
The other reason I've replaced some of them because they seem to leak
around the joint where the sprinker retaining collar gets screwed into
the base canister. I can't figure out why it leaks (it seems clean) but
I also notice that new units (like these old ones) don't seem to have a
gasket where the collar meets the canister.
Well, yes. These are self-draining sprinklers. I think when the
pressure is turned off and they re-seat themselves back down into their
canisters (because of the big spring they have) it must open or expose
some passage where water can passively drain from them.
Unless you cracked the elbow or the extension where the canister is
screwed into, I'd say no.
Be aware that the extension tubes are very soft plastic (at least the
black plastic multi-segmented ones sold by home despot).
I was done messing around with these things about a month ago. Some
still need tweaking, but I'll do that next summer.
Thanks for the feedback, Home Guy and Bob. Tomorrow, I'll be better
educated when I go back to the place I bought the heads, a professional
sprinkler company, not HD or Lowes, and describe the problem.
What problem? It's normal for popup heads to leak
slighltly around the seal between the popup part and
the base when it's watering. They tend to leak more
with age. You just don't want a lot
of water spewing out. It's also perfectly normal for
water to come out of the head for 30 secs after it's
shut off, if it's a downhill run. Why would you care
about water trickling for 30 secs into the lawn?
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