A system has two Rain Jet sprinkler models. The triangular-cased head adjusts via a button, but the Series 4000 has no visible adjustment. The heads are hitting a new cedar fence.
Some rotor sprinklers have a snap-on cap covering the adjustment mechanism. Try lifting off the cap to access arc and radius settings.
Rain Jet (later Lawn Genie, then Toro) parts and manuals are scarce. If the cap doesn't reveal adjustments, replacement with a modern rotor (Hunter PGP, Rain Bird 5000) may be the only option.
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