08337900 – Extension Spring (Genuine Ariens / Gravely OEM Part) The 08337900 Extension Spring is a genuine Ariens / Gravely OEM mower deck component designed to maintain proper belt tension and idler operation within the mower deck drive system. This spring plays a critical role in ensuring smooth belt tracking, consistent blade engagement, and reliable cutting performance. Manufactured to original Ariens / Gravely specifications, this heavy-duty extension spring provides dependable tension under continuous load, helping reduce belt slippage, uneven cutting, and premature wear on deck components. Product Details Part Number: 08337900 Description: Extension Spring Component Type: Mower deck / belt tension spring OEM Status: Genuine Ariens / Gravely replacement part Condition: New Key Benefits Maintains correct mower deck belt tension Supports smooth idler pulley movement Helps prevent belt slippage and uneven blade speed Durable spring steel construction for long service life Direct OEM replacement for exact fit and performance Applications Commonly used in mower deck belt, idler, and blade drive systems on Ariens and Gravely zero-turn mowers, including but not limited to: ZT Series (40", 44", 48", and 52" decks) Briggs & Stratton and Kohler engine configurations Early and mid-production serial number ranges Deck assemblies utilizing spring-loaded idler systems (Always confirm compatibility using your model and serial number.) Replacing worn or stretched deck springs with the 08337900 Ariens / Gravely OEM extension spring helps restore proper belt tension, improves cutting consistency, and ensures your mower deck operates as designed.
