Anyone familiar with this sprinkler head?

[sprinklerguy68]

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" inlet and is shorter than an 1804. Any info is appreciated!

 

[WorthFlorida]

I looked up the US patent number. May not help but it sure looks very complicated as compared to new designs. Patent in 1961 by Hunter.


https://pdfpiw.uspto.gov/.piw?docid...Url=//patft.uspto.gov/netahtml/PTO/patimg.htm

 

[Sponsor]

 

[sprinklerguy68]

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!