The Stihl 61707600890 Tension Arm Complete is an original equipment manufacturer (OEM) part specifically engineered for Viking lawn mowers. This crucial component maintains correct belt tension within the mower's drive system, preventing slippage and ensuring efficient power transfer. Constructed from durable materials, it provides reliable performance and extends the lifespan of associated drive components. This tension arm is a direct replacement, guaranteeing a precise fit and restoring optimal functionality to your Viking lawn mower.