The steel coloured wheel sits in the middle, and is driven by the barrel arbor.Īnd here is the power reserve indicator wheel with a slot. When winding the watch manually or automatically, the barrel arbor drives the inner planetary wheel, turning the power reserve indicator wheel in the other direction. The little steel pinion at the top is driven by the barrel, and drives the outer planetary wheel (bit wheel at the bottom), which drives the power reserve indicator wheel through a clutch mechanism. This is the power reserve indication mechanism. The gear train with autowinder intermediate wheels at 11 o’clock. The crown wheel with its plastic ring, which avoids wear. they are leaving enough material not to destabilise the plate. The cut-outs made into the plate are well done, e.g.
Zenith el primero chronomaster t open 03.0240.4021 watch manual#
The usual abrasion on the intermediate winding wheel post – an issue Zenith hasn’t addressed properly since the conception of the movement, and the reason why I would go for a manual wind Zenith. I start off with the chronograph layer on the top plate.Īll chronograph elements are nicely visible with the chronograph bridge removed.
The top plate of the 400 and the 4021 are identical. Under the cover at the top right lurks the power reserve indication mechanism. The escapement is exactly in the same place, but opened up for visibility. The lowest hand is for the power reserve indication, which we will explore in more detail later.Ī very different bottom plate to the standard calibre 400. The skeletonised movement exposes the escapement and balance through an opening in the dial. There are a further 8 screws for the bezel ring.Ī bit of dirt got into the case, but not past the gaskets. The case back is screwed into place with 8 screws, guaranteeing a tight seal. With an amplitude of 205 degrees, the movement needs a service. This watch was sent in from Lithuania, just to make the whole thing a bit more interesting 😉Ī good thing that the watch has a crystal case back – there are a lot of nice things to see in here! The dial looks a bit Breguet-like, and there is of course no hour recorder as on the calibre 400. On top of that, the movement is skeletonised around the balance and escapement, so that these components are visible through an opening in the dial. Instead of the hour recorder and date, the 4021 has a pretty nifty power reserve indication. The 4021 is a modification of the calibre 400. We’ve done quite a few El Primeros here at the workshop, but never the calibre 4021.
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