JYLEYJ Spindle Assembly for 54-inch Mower Deck — Direct-Fit OEM 618-06978/918-06978, Restores Even Cut

A direct-fit replacement spindle assembly designed for 54-inch mower decks from Cub Cadet, Troy-Bilt, Craftsman and compatible MTD models, replacing OEM 618-06978 and 918-06978.

If your 54" lawn mower deck is wobbling, cutting unevenly, or making grinding noises, the spindle assembly is a common wear item. This JYLEYJ spindle assembly is built to match the mounting, shaft, and pulley dimensions used on many Cub Cadet RZT, XT, ZT series decks and comparable MTD/Troy-Bilt/Craftsman machines, offering a straightforward swap for decks that list OEM numbers 618-06978 or 918-06978.

How will this spindle assembly restore deck performance?

Replacing a worn spindle removes play from the blade shaft, reduces vibration, and returns the blade to a true plane for even cutting. Proper spindle fit preserves belt alignment and blade speed, which helps restore deck efficiency.

• Direct-replacement for OEM 618-06978 and 918-06978.
• Fits 54" decks on specified Cub Cadet, Troy-Bilt, Craftsman, and MTD models.
• Matches factory bolt pattern and shaft diameter for bolt-in installation.

Which mower models and decks is this compatible with?

This spindle is compatible with a wide set of 54" mower decks used by Cub Cadet RZT-L54, RZT-S54, XT1/XT2 series, ZT1/ZT2 series, and many MTD-built Craftsman and Troy-Bilt machines. Always cross-check your original OEM number or measure bolt spacing to confirm fit.

• Cub Cadet RZT-L54, RZT-S54, XT1-GT54, XT2-GX54, ZT1-54, ZT2-54.
• Troy-Bilt TB2454, Mustang 54, Super Bronco 54 GT and similar 54" decks.
• MTD/Craftsman models T8400, Z6900, G8400, G8600 where 618-06978/918-06978 is specified.

What should I expect when installing this spindle assembly?

Installation is a straightforward mechanical replacement if you have basic tools and follow deck safety procedures. Remove the deck, support the blade, unbolt the old spindle, transfer or replace the blade and pulley as needed, then torque the new unit to spec.

• Bolt pattern and shaft length match OEM for simple swap-out.
• Inspect blades, belts, and bearings during replacement for best results.
• Follow manufacturer torque specs and safety steps when reassembling.

What warranty or support comes with the part?

JYLEYJ includes a 24-month after-sales warranty and customer support to address fitment or quality questions. Contact the seller directly for assistance and they aim to respond within 24 hours.

• 24-month after-sales warranty included.
• Support for fitment questions and installation guidance.
• Prompt response policy for customer concerns.

Who is this for: This spindle assembly is intended for homeowners, lawn care technicians, and repair shops maintaining 54" deck lawn tractors from Cub Cadet, Troy-Bilt, Craftsman and compatible MTD-built models that reference OEM numbers 618-06978 or 918-06978. It's useful for anyone replacing a worn or noisy spindle to recover even cutting and reduce vibration without modifying the deck.