Genuine MTD safety spring switch — part 725-1644 — a direct replacement seat/reverse safety switch that restores the rider‑presence/kill function on many MTD lawn tractors. The assembly is a small metal spring/switch unit with a round plunger actuator and a two‑wire connector designed to mount beneath the operator seat; it’s the same style switch used to cut power or disengage drive when the operator leaves the seat.
Compact physical size: approximately 113 mm long x 50 mm wide x 23 mm high, making it easy to fit into the original seat‑switch bracket and replace a worn or bent spring/switch assembly. This is an original MTD part, listed as “safety spring switch” on MTD’s parts catalog. If you’re repairing a mower and only need the switch itself, this part gives you the exact factory match.
Example models (non‑exhaustive) that commonly use 725‑1644 include a range of Yard Machines and Yard‑Man riding tractors (for example 13A1760F700, 13A1762F700 and related 13A/13AA/13AC series models) and numerous Cub Cadet/MTD Gold tractors and garden tractors — these are typical compatible applications but always confirm against your machine’s eleven‑character model number under the seat.
If your mower’s seat switch is sticking, warped, or no longer holds the plunger reliably, this genuine MTD 725‑1644 replacement restores the safety interlock quickly and cleanly — a straightforward swap under the seat with the existing two‑wire harness. It’s a handy parts for power tools and outdoor equipment fix when you need a precise, original replacement.
