TENGMUJX 54-Inch Mower Deck Spindle Assembly for Cub Cadet & Troy-Bilt — Fits 54" Decks, OEM 618-06978/918-06978, Bearinged

TENGMUJX 54-inch replacement mower deck spindle assembly designed to restore cutting performance on compatible Cub Cadet, Troy-Bilt, MTD and Craftsman 54" decks.

If your 54-inch deck is producing uneven cuts, excessive vibration, or blade wobble, a worn spindle assembly is a common culprit. This TENGMUJX spindle replaces OEM numbers 618-06978 and 918-06978 and is engineered to fit a wide range of RZT, XT1, XT2, GT, ZT and Mustang model decks. It’s built to meet factory fit dimensions so you can reinstall without modifying your deck and get back to smooth, consistent mowing.

Which mower models will this spindle assembly fit?

This spindle assembly is compatible with many 54" decks from major brands. It suits multiple Cub Cadet RZT and XT series decks, Troy-Bilt Mustang and Bronco tractors, and several MTD/Craftsman mower decks listed by OEM replacement numbers.

• Fits Cub Cadet: RZT-L54, RZT-S54, RZT-LX 54, S54, XT1-GT54, XT1-ST54, XT2-GX54
• Fits Troy-Bilt: TB2454, Mustang XP, Super Bronco, Bronco series
• Fits Craftsman/MTD: T8400, G8400, G8600 and related 54" decks
• Replaces OEM part numbers 618-06978 and 918-06978 and Stens 285-705

How does this spindle assembly improve deck performance?

Replacing a damaged spindle assembly eliminates blade wobble, reduces vibration, and restores blade alignment for even grass cutting. The precision bearings and hardened housing maintain stable blade rotation under typical lawn conditions.

• Stabilizes blade rotation to reduce striping and scalping
• Reduces vibration that can damage deck and mounts
• Improves safety by keeping blades secured and balanced
• Matches factory mounting points for straightforward replacement

What should I check before ordering and installing?

Verify your mower deck model and OEM part number to ensure compatibility. Measure mounting bolt spacing and compare pulley and shaft dimensions; this avoids returns and ensures the spindle lines up with belts and deck housings.

• Confirm your deck is a 54-inch model and matches listed series
• Compare OEM numbers 618-06978 or 918-06978 where available
• Check bolt hole pattern and spindle shaft size before purchase
• Have basic hand tools and a service manual or guide for safe removal/installation

What quality and warranty support does TENGMUJX provide?

TENGMUJX manufactures replacement mower parts with quality checks to meet aftermarket standards and offers a 24-month after-sales warranty. Their customer support is available for fitment questions, installation guidance, and warranty claims.

• Manufactured to meet or exceed common aftermarket tolerances
• 24-month warranty covers manufacturing defects
• Customer service responsive within 24 hours for assistance
• Strict quality control during production and packing

Who is this for: This spindle assembly is aimed at homeowners, landscapers, and repair shops who own 54" mowing decks from Cub Cadet, Troy-Bilt, MTD or Craftsman and need a reliable replacement part without modifying their deck. It’s suitable for DIY mechanics who can follow standard deck removal procedures and for technicians servicing multiple compatible models seeking a cost-effective aftermarket option.