The service manual has a different cam chain tension device then what is actually on my bike?

Here is what is in the service manual book but the parts book has a different type.
It has device that has an adjustment screw on top.



Then it has these instruction for manually adjusting it…the type above


That part was replaced with this part and I am pretty sure it is supposed to be automatic and not adjustable? This is from a DR200 parts book and identical to what is on my bike.


It looks like it has notches and would moves as the slack increased in the chain? The spring would have constant tension on it and then it reacts to pressure from the chain? The spring locked out until the chain push past a notch then it springs the guide forward to the next notch?

Point is the device can only be removed and cleaned, if you hear what sounds like a cam chain noise then the device is removed and inspected, what notch is it on? No more notches left the chain needs to be replaced?

I am only guessing since the manual I have is outdated, so I have to guess? I paid not to and still have too…Thanks Quality Blink.