Overview – HALF ROUND KEY OF SHAFT GEAR 206904-20
The Cummins HALF ROUND KEY OF SHAFT GEAR 206904-20 is a direct replacement used in Cummins gear train timing – shaft-to-gear location, with no modification required at installation.
Parts Characteristics
A half-round (Woodruff) key that seats in a shaft slot and locates a gear or sprocket on its shaft. It carries the drive torque and keeps the gear timed to the shaft, so a sheared or loose key lets the gear slip and destroys the timing.
Applicable Models & Applications
Used at Cummins shaft-and-gear joints of this key size. Match the key width, diameter and depth against your parts book – Woodruff keys of similar outline differ in how deep they sit in the shaft.
Maintenance & Replacement
Inspect keys whenever a gear is removed, and never reuse a key that shows any shear or bruising. A key that has taken a hit is already partly failed, and it will let go at the worst possible load.
Replace the key and the gear together if the gear bore shows keyway damage. Fitting a new key into a chewed keyway repeats the slip and quickly ruins the fresh gear.
Seat the key fully into its shaft slot before the gear goes on, and check that the gear sits timed and square. A key that stands proud stops the gear from bottoming and leaves it loose on the shaft.
Keep the common key sizes in the overhaul kit. They are tiny, cheap and absolutely load-critical – the sort of part that should never be the reason a rebuild stops.
Price Reference (USD)
For planning purposes, allocate USD 2 to USD 10 per HALF ROUND KEY OF SHAFT GEAR 206904-20, excluding local import duties.
Value & Service
We supply brand-new half-round keys in the size your shaft calls for, in packs so a timing job never stalls on a small part.
For critical Cummins General Parts such as the HALF ROUND KEY OF SHAFT GEAR 206904-20, Racer Machinery offers both single units and bulk quantities with traceable sourcing.
