Hitachi 992-926 Spare Part - Spring Plate

Hitachi 992926 — Spring Plate (genuine Hitachi). A small steel spring plate used in the clutch/spring stack of Hitachi rotary hammers and hammer drills to restore proper slip‑clutch engagement and reliable hammer action.

Fits (example models): C9BU3, C9U3, DH25PA, DH25PB, DH28PC, DH28PD, DH30PC2. These model listings show the 992926 spring plate positioned with the clutch plate (992916) and Belleville spring in the gearbox assembly.

Service details: the part is supplied singly and is the stamped spring plate that sits directly against the clutch components in the drive housing — replace it when the clutch feels sloppy, skips, or the hammer stroke is irregular. As a genuine Hitachi part, it’s an inexpensive replacement to get your tool back to factory fitment; keep the surrounding retaining ring and Belleville spring in the correct order when reinstalling.

If your parts diagram shows item 992926 in the clutch/gearbox stack, this is the correct Hitachi parts replacement to use.