8TEN Idler Pulley for John Deere Ztrak Z-series - AUC11584 Direct-Fit Replacement, 7 7/8" OD, 1/2" Bore

8TEN Idler Pulley AUC11584 is a direct-fit replacement pulley designed to restore belt alignment and tension on a wide range of John Deere Ztrak and Z-series zero-turn mowers.

This 8TEN idler pulley replaces John Deere OEM AUC11584 and fits numerous Z-series models, offering precise dimensions and compatible mounting for routine maintenance or repair. Built to the specifications listed below, the pulley helps maintain proper belt routing and reduces belt wear by keeping tension and alignment consistent. If you're servicing a Z930M, Z950R, Z915E or similar model, this part is a practical OEM-compatible option to get your deck running smoothly again.

Which John Deere models will this idler pulley fit?

The 8TEN idler pulley is made to match the AUC11584 OEM reference and fits a broad set of Ztrak and Z-series commercial and residential mowers. Check your machine's parts list or existing pulley for the OEM number to confirm fitment before ordering.

• Compatible OEM number: John Deere AUC11584
• Common fits include Z930M, Z950R, Z915E, Z955M, Z920M, Z930R, Z950M
• Also fits earlier and related models: Z930A, Z925A, Z960R, Z720A, Z970R

What are the pulley’s exact measurements and mounting details?

This idler pulley is specified with outer and inner diameters plus overall height so you can compare to the part being replaced. Knowing these dimensions ensures the replacement will align with your mower’s belt path and mounting hardware.

• Outer diameter: 7 7/8 inches (nominal)
• Inner diameter (bore): 1/2 inch
• Overall height: 1 3/4 inches
• Designed for direct replacement where AUC11584 is specified

How does swapping the pulley help mower performance and maintenance?

Replacing a worn or damaged idler pulley restores correct belt tracking and reduces slippage, noise, and premature belt damage. A properly functioning pulley also helps preserve blade drive efficiency and lowers the chance of sudden breakdowns while mowing.

• Improves belt alignment and tension consistency
• Reduces belt wear and operational noise
• Simple bolt-on replacement for compatible models

What should I inspect when installing this replacement pulley?

During installation, inspect the mounting bolt, shaft, surrounding brackets, and the belt for signs of wear or damage. Replacing related hardware or the belt at the same time can prevent repeat service and ensure optimal deck performance.

• Check mounting bolt and shaft for straightness and wear
• Inspect belt condition and replace if cracked or glazed
• Confirm proper routing and tension after installation

Who is this for: The 8TEN idler pulley AUC11584 is intended for owners, fleet managers, and repair technicians who maintain John Deere Ztrak and Z-series mowers and need an OEM-compatible replacement. It’s suited for routine deck maintenance, mid-season repairs, or prepping equipment for peak mowing periods. If your mower’s parts list references AUC11584 or you note belt misalignment on covered models, this pulley provides a dimensional match and straightforward install to get the deck back in service.