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Looked at the patent; it looks like there is a retaining clip holding the motor assembly in place so I think removing that clip will provide access to the filter screen. Thanks for the link!

I have this old toro gear drive that I found in a bin of old sprinklers. I have never seen this head before and I figured out how to adjust it, but I can’t see any way to access the filter at the bottom of the head plus I have not found any info regarding this sprinkler online. It has a 1/2"...

You could be right. I do have a unused old valve that I took out a few years ago. I think that the solenoids on the old valves can be removed, given that the ones in the ground appear to be installed in different positions. I'm thinking maybe using channel locks to get them loose.

Update: I decided to temporarily hook up the esp controller to the system, and found out that it had similar problems (manually started a zone, said zone shut off after a couple seconds with severe water hammer.). So now I'm thinking that it could be the connections at the valves going bad...

I swapped the zones yesterday and ran them today, determined that the controller is not the problem, as you have pointed out. Later today I'm going to check the voltage as it's running; thanks for the info on the transformer! Addendum: I do have another controller just in case it is the...

Thanks for the suggestions! I'll measure the output of the transformer first to see if that's the culprit. If not, I'll swap the zone wires like you said. I have actually had this issue since I have installed that timer (a year ago at least) and yet I have never thought to swap the wires! I'll...

Hello all, new member here. I have a problem with my sprinkler system that I just can't figure out. I control the system using a rain bird ism timer with 8 zones hooked up to it. The system was originally installed in '68 so most of the zones have their original valves which still work. The rest...