AKM Spindle Assembly for 46" Mower Decks — 918-0240C / 618-0240C, SUJ2 Steel, Pre-tapped with Screws

AKM 918-0240C / 618-0240C spindle assembly is a full OEM-style replacement spindle for 46-inch mower decks that restores blade alignment and deck performance.

This precision-made spindle assembly fits many MTD, Cub Cadet, Troy-Bilt and Toro models and is engineered to replace broken, bent or worn original spindles. Built from SUJ2 steel and supplied as a complete unit, the part ships with fasteners already installed in pre-tapped holes to simplify installation. Dimensions are designed to match common 46-inch decks, including an overall height of 5.31" (135 mm), a pulley outside diameter of 4.92" (125 mm), and a mounting hole center distance of 3.15" (80 mm).

Which machines and part numbers does this spindle replace?

This spindle assembly is compatible with a wide range of garden tractors and lawn mower models from established brands. It replaces many OEM part numbers so you can confidently match it to your worn or damaged spindle.

• Replaces MTD/Cub Cadet numbers: 618-0240, 618-0240A/B/C, 618-0241, 618-0430 and variants
• Also cross-references Toro and Troy-Bilt numbers including 918-0240/918-0430 series and 112-0311
• Common fit for 46" decks on LT4600H, LT546H, LX465, LX460 and similar models

How does installation and fitment work for this spindle?

The unit arrives as a full spindle assembly with mounting screws placed in pre-tapped holes, reducing bench time and the need to source fasteners separately. Basic mechanical skill and common tools let most users swap the old spindle for this upgraded replacement.

• Pre-tapped holes with included screws speed up bolt-up
• Match mounting hole center distance (3.15" / 80 mm) and overall height (5.31" / 135 mm)
• Measure pulley OD (4.92" / 125 mm) to confirm belt alignment before install

What materials and benefits does the SUJ2 steel construction provide?

The spindle's SUJ2 steel construction offers high hardness and wear resistance compared with basic mild steels. That improved durability helps maintain blade concentricity and deck stability under normal mowing stresses, reducing vibration and uneven cuts.

• High-strength SUJ2 bearing-grade steel for longer service life
• Reduced shaft deflection compared with bent or fatigued originals
• Factory-assembled spindle unit minimizes alignment issues during replacement

Will this spindle improve cutting performance or fix noisy decks?

Replacing a damaged or worn spindle often restores the blade’s balance and deck geometry, which can reduce chatter and improve cut consistency. While it doesn’t alter engine power or blade design, a true-to-spec spindle helps the deck track and cut as intended by the manufacturer.

• Restores correct blade height and rotation for more even cutting
• Minimizes wobble that causes uneven grass finish and vibration
• Maintains pulley alignment for consistent belt tension and drive efficiency

Who this is for: This AKM spindle assembly is intended for DIY homeowners and professional landscapers who need a dependable aftermarket replacement for 46-inch mower decks on MTD, Cub Cadet, Toro and Troy-Bilt equipment. Choose this part when the original spindle is bent, noisy, leaking bearing play, or when you need a quick, hardware-included swap to get the deck back to reliable mowing without hunting for individual components.