138-7228 – Spring-Extension (3BW) – Genuine Toro OEM Part The Toro 138-7228 Extension Spring (3BW) is a genuine Toro OEM tension spring designed to provide consistent return force and maintain proper tension within mower deck and drive system assemblies. This extension spring plays a critical role in belt tensioning, component positioning, and smooth mechanical operation during normal equipment use. Manufactured to Toro original equipment specifications, the 138-7228 spring is made from high-quality spring steel to withstand repeated stretching, vibration, and demanding outdoor operating conditions without loss of tension. Product Details Manufacturer Part Number: 138-7228 Brand: Toro Part Name: Spring – Extension Series / Code: 3BW Part Type: Tension / Return Spring OEM Status: Genuine Toro OEM Condition: New Key Features Maintains consistent tension and controlled return action High-strength spring steel for long service life Designed to resist fatigue, stretching, and deformation Supports proper belt tracking and component alignment Direct-fit OEM replacement with no modification required Compatibility The Toro 138-7228 Extension Spring is used on select Toro lawn mowers and zero-turn mower assemblies, commonly within mower deck belt tensioners, idler arms, or linkage systems utilizing 3BW-series components. Typical applications include: Toro mower deck belt tension systems Idler arm and linkage assemblies Lawn and turf equipment requiring OEM extension springs
