Hitachi 333640 Spare Part - DC-SPEED CONTROL SWITCH

333640 supersedes older part numbers: 333-640

Genuine Hitachi DC speed‑control trigger switch (Part No. 333640) — direct replacement for the earlier 322994 switch. This is the variable‑speed trigger assembly that houses the DC speed control electronics used on Hitachi/HiKOKI 14.4–18V cordless drills and impact drivers; it restores smooth variable speed, responsive trigger control and reliable on/off switching when the original switch fails.

Straightforward drop‑in fit for many Hitachi/HiKOKI DS and DV series tools — for example DS14DSDL, DS18DSDL, DV18DSDL and DV18DMR — and is offered as the genuine Hitachi replacement part for those models. Use this part when your tool has intermittent power, won’t vary speed with trigger pressure, or the trigger feels loose or unresponsive.

Supplied as the complete switch/trigger assembly (no modifications required), 333640 is commonly listed as the “DC speed control switch” or “speed control/trigger” and is the factory replacement used by Hitachi/HiKOKI service networks. If your drill is one of the DS/DV family above, this part matches the original mounting and electrical connections.

(Part numbers and model compatibility are drawn from Hitachi/HiKOKI parts listings.)