This genuine Gravely extension spring (OEM Part No. 08300728) is designed for use in the deck belt idler system of Gravely zero-turn mowers, including models 991083, 991084, and 991090. It helps maintain consistent belt tension, ensuring smooth operation and reducing wear on pulleys and belts.
The spring is positioned near the discharge side of the deck and replaces older part numbers 08300507 and 08334100. It’s commonly used across Gravely ZT HD, PRO-TURN Z, PRO-TURN ZX, PRO-TURN 100/200, and Ariens APEX and ZENITH series mowers.
Made from durable steel with a wire diameter of 0.1800″, coil length of 4-1/4″, and overall length of 6″, this spring is built to withstand repeated flexing and vibration. It’s a direct OEM replacement and installs easily without special tools.
Sold individually.
Technical Specifications:
Overall Length: 6″
Wire Diameter: 0.1800″
Coil Length: 4-1/4″
Coil Diameter: 0.8500″
Material: Steel
OEM Brands: Gravely, Ariens