On Sep 6, 4:10*pm, Tony wrote:
On 9/6/2010 1:09 PM, Chris wrote:

Anyone have any ideas why an impact sprinkler would rotate fine in one
direction, but not return? I have tried varying the water pressure up
and down, checked for debris, tried moving the collars around to
different spots and heights, but the trip pin just sticks on one side.
Any help appreciated!

Chris

If it is an actual "pin" that is sticking, and you can disassemble to
that point, get some silicone grease from a hardware store, and
lubricate the pin itself. *It feels like anything but lubricant (it's
sticky as all get-out) but it works like a charm, and won't wash off.

Tony M.

A couple web sites I checked- Rain Bird and Toro- both said that's to
be avoided at all costs. They said it will work for a while, but soon
the lube will start picking up particulates and that can clog the
system badly, or even cause significant early wear on the parts. I
have no experience with the matter in sprinklers, but I do know that
the first thing you do with a rifle fresh from the factory is scrub
every bit of grease off of it, and for the same reason (although
perhaps with somewhat more catastrophic results).

Chris