UDC Parts 618-06980 Spindle Assembly – 50-Inch Deck Replacement for MTD/Troy-Bilt/Cub Cadet

Overview

Meet the UDC Parts 618-06980 spindle assembly, a reliable replacement designed for 50-inch deck lawn tractors and zero-turn mowers. This part conveniently replaces OEM components MTD 618-06980 and 918-06980, helping you restore smooth blade action and consistent cutting performance without guesswork.

Built to withstand demanding mowing sessions, the spindle combines sturdy construction with a precise fit. The design centers on a 6-1/2 inch height and 5 inch pulley diameter, plus a 6-point star for secure blade mounting. With a thoughtful inclusion of hardware, this kit is set up for straightforward installation and dependable operation during busy seasons.

Key specifications

• Height: 6-1/2 inches
• Pulleys: 5 inches outer diameter
• Mounting interface: 6-point star
• Includes: 1 spindle, 4 mounting bolts, 1 blade mounting bolt, 1 pulley lock nut, 1 washer

Compatibility at a glance

The spindle is designed to fit a broad range of 50-inch deck models from leading brands, including Troy-Bilt, Cub Cadet, Craftsman and MTD. Examples span popular lines such as Troy-Bilt Super Bronco and Mustang series, Cub Cadet XT1 Enduro and RZT families, Craftsmans Z-series, and various MTD ZT and LX/LX50 configurations. If your mower uses a 50-inch deck and the components listed above, this spindle can be a close match for restoring blade alignment and cutting consistency.

• Troy-Bilt: 50-inch decks including 13AQA2KQ011, 13WQA2KQ011; ZT models like 17ARFACQ066, 17AAFACQ066, 17AKCACZ066, 17ANCACZ066, 17ARCACQ011, 17ARCACQ211
• Cub Cadet: 50-inch XT1 Enduro and RZT variants such as RZT-S50 KH FAB 17RRCBYZ010, 17ARCBYZ056, RZT-SX50 EFI FAB 17RWCBYZ010, 17AWCBYZ010, RZT-S50 KH 17WRCBDQ010, 17ARCBDQ056
• RZT-L50/LX50/50 families including LX50 KH, S50KH, ZT1-50 FAB ULTIMA and ZT2-50 FAB ULTIMA
• Craftsman/ZT-series: Z550, G8200, G8300, ZS6700; ZT-L50 and ZT-L50 KH FAB
• MTD: ZT-L50 and ZT-L50 KH with 50" deck; additional Z-series 50-inch configurations

Performance you can feel

Designed to enhance your mower’s performance, this spindle aims for smoother blade rotation and reliable operation under challenging conditions. Crafted from durable materials, it’s built to endure regular use and the vibrations of 50-inch deck mowing, helping you achieve cleaner cuts over time.

Installation and care

Includes all necessary mounting hardware for a straightforward replacement. For best results, follow your mower’s service manual for installation steps and torque values. A proper fit can reduce downtime and promote even blade wear across your deck.