JSXDNWYJ Spindle Assembly for 46-inch Mower Decks — 6.3" Pulley, 6-Point Star Shaft (1-Pack)

This JSXDNWYJ 918-05078A spindle assembly is a direct-replacement spindle with a 6.3" pulley and 6-point star shaft designed to restore cutting performance on 46-inch mower decks.

Designed to replace OEM part numbers such as MTD/Cub Cadet 618-05078, 618-05078A, 918-05078 and 918-05078A, this spindle assembly ships as a complete unit (spindle body, pulley, and mounting screws) and fits a wide range of zero-turn and lawn-tractor models with 46-inch decks. The assembly features a 6.3-inch (6-7/16") diameter pulley and a 6-point star blade mount to accept star-style blades. At approximately 7-1/4" tall, it matches the form factor of the original equipment for straightforward installation.

Will this spindle fit my 46-inch Cub Cadet or Craftsman deck?

Yes — the spindle is built to be compatible with many Cub Cadet, Craftsman, MTD, and Troy-Bilt models that use the listed OEM numbers. Check your current part number, blade mount type, and pulley diameter to confirm compatibility before ordering.

• Replaces OEMs: 618-05078, 618-05078A, 918-05078, 918-05078A
• Fits Cub Cadet RZT-S46, RZT-L46, ZT1/ZT2-46 and related series
• Compatible with Craftsman Z530/Z6400 zero-turn models and select lawn tractors
• Works with many MTD, Troy-Bilt, Murray, Huskee, and White 46" deck models

How does the 6-point star shaft affect blade choice and performance?

The 6-point star shaft is intended for star-style blade mounts and keeps blades secure during normal cutting loads. Using blades designed for a star-mount reduces slippage and ensures proper alignment, which helps preserve balance and reduce vibration.

• 6-point star design accepts corresponding star-mount blades
• Proper blade fit reduces wobble and bearing stress
• Designed to maintain correct blade-to-deck clearance for consistent cuts

What are the key specs and what comes in the box?

The spindle assembly ships as a ready-to-install unit with the pulley already attached and necessary mounting screws included. Key dimensions and mechanical details are supplied to help you verify fitment against your original spindle.

• Pulley diameter: 6.3 inches (6-7/16")
• Overall height: ~7-1/4 inches (18.4 cm)
• Includes spindle body, pulley, and mounting screws
• Intended for star-style blade mounting (6-point shaft)

How straightforward is installation and what should I check during replacement?

Installation is typically a moderate DIY task for anyone comfortable removing the mower deck and loosening blade hardware. Use correct torque on mounting bolts and verify belt alignment and pulley orientation before fully tightening.

• Remove spark plug and support deck for safety
• Match pulley direction and belt routing to original setup
• Replace blades if worn and torque bolts to manufacturer specs
• Inspect belts and deck spindles for wear while replacing

Who is this for: This JSXDNWYJ spindle assembly is intended for owners and technicians maintaining 46-inch mower decks on zero-turn mowers and lawn tractors who need a reliable, OEM-replacement spindle with a 6.3" pulley and 6-point star blade mount. It’s a practical choice for replacing a failed or worn spindle on compatible Cub Cadet, Craftsman, Troy-Bilt, MTD and allied-brand machines, restoring proper blade attachment and deck drive geometry without upgrading other deck components.