How to access the mix valve adjustment? Unknown valve set.

[StevePHL]

I have a circa 2003 shower valve set on which I'd like to adjust the temp range. The problem is, I can't figure out how to get the cap/handle off to access the cartridge. There is no set screw and it doesn't seem to want to unscrew (don't want to force it too hard). Any suggestions would be appreciated. The top valve is on-off-pressure. The lower valve is temp mix. I can find no brand info on the fixture.

 

[Tuttles Revenge]

That is a Grohe Seabury valve trim. Thermostatic mixing valve on all the time sending water to a volume control / ON/OFF valve

 

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[StevePHL]

That is a Grohe Seabury valve trim. Thermostatic mixing valve on all the time sending water to a volume control / ON/OFF valve

Thanks. How do I adjust the range? As it is, it only goes from hot to super hot. There is no way to remove the handle that is clear to me.

 

[Tuttles Revenge]

I found this vague reference. Looks like the small bonnet unthreads to uncover a set screw.

 

[Tuttles Revenge]

Found the Grohe parts diagram for this: Seabury Parts

1: Similar thread: Seabury
2: Similar thread: Seabury

 

[StevePHL]

Found the Grohe parts diagram for this: Seabury Parts
View attachment 86874
1: Similar thread: Seabury
2: Similar thread: Seabury

With the info you provided I found this video. Problem solved. Thanks very much for your assistance!