Original Bosch tensioner arm — part number F016104000. This genuine Bosch replacement is the molded tension / lever arm that maintains drive tension on the belt / roller assembly of select Bosch lawn-care machines. Supplied as a single, factory‑formed tensioner arm with the original mounting / pivot features for a direct, bolt‑on swap.

Example fitment (verify your full 10‑digit type number on the tool’s plate before ordering): ALR 900 (type 3 600 H8A 000) and AVR 1100 (type 3 600 H8A 100).

If your machine shows a broken or worn tension arm that lets the belt slip or the roller move freely, this original Bosch F016104000 restores the correct tensioning geometry and factory mounting points so the unit operates like intended.