PetMigo 54" Deck Spindle Assembly for Cub Cadet MTD Troy-Bilt — 54-inch OEM-fit, 6-Point Star, 173mm Height

The PetMigo 54" deck spindle assembly (618-06978 / 918-06978) is a direct-fit replacement spindle built to restore cutting performance for a wide range of 54-inch Cub Cadet, MTD, Troy-Bilt and Craftsman zero-turn and lawn tractor decks.

This heavy-duty spindle comes with a 6-point star design, a 6 13/16" (173 mm) spindle height and a 5 7/16" (138 mm) pulley outer diameter, engineered to match OEM dimensions for many 54" decks. It replaces part numbers 618-06978, 918-06978 and several 490-130-xxx variants, offering a like-for-like option when your original spindle shows wear, wobble, or damaged bearings. The assembly is compatible with a broad list of models from Cub Cadet, MTD, Troy-Bilt, Columbia and select Craftsman/White Outdoor machines (see model details below) so you can get back to even, reliable mowing without custom modifications.

Which mower models will this 54" spindle fit?

This spindle fits many 54" deck applications across multiple brands but not every machine with a 54" deck. Review the specific model lists and years to confirm fit before ordering; the listing includes Cub Cadet RZT, XT and ZT series, MTD/White Outdoor ZT and YT lines, Troy-Bilt TB2454 variants, Columbia CGT/CSLT models, and several Craftsman zero-turn part families.

• Cub Cadet: RZT-L54, RZT-S54, XT1-GT54, XT1-ST54, XT2-GX54, XT2-ST54, ZT1-54 and ZT2-54 (select 2019–2020 models)
• Troy-Bilt: TB2454 series and Super Bronco / Mustang 54 variations (selected years)
• Craftsman/White Outdoor/MTD: Z6600, T8400, G8400 series and various Turn Tight models
• Columbia and other compatible 54" deck models listed in product details

What are the key dimensions and features to check for fit?

Match spindle height, pulley outer diameter and bolt/shaft pattern to your original part for proper alignment. This PetMigo spindle is specified to the same critical OEM measurements so it mounts and belts align correctly in most compatible applications.

• Spindle height: 6 13/16" (173 mm)
• Pulley outer diameter: 5 7/16" (138 mm)
• 6-point star design for pulley attachment and torque transfer
• Replaces OEM numbers: 618-06978, 918-06978, 490-130-C013/F013/Y013

How straightforward is installation and what tools are typically needed?

Installation is straightforward for anyone familiar with mower deck work: remove the deck, unbolt the old spindle, swap assemblies, torque hardware to spec, and reinstall the deck. Basic tools and common safety steps are usually sufficient, but consult your mower manual for torque values and safety procedures.

• Common tools: socket/ratchet set, torque wrench, safety gloves
• Recommended: service manual for bolt torque and belt routing
• Time estimate: typically 1–2 hours for a DIY-savvy technician

Will this spindle restore cutting quality and deck alignment?

Replacing a worn or damaged spindle with a like-for-like assembly restores blade runout and belt alignment when installed properly, which improves cut consistency. It’s a direct mechanical replacement designed to meet the same mounting and pulley specs as the original equipment.

• Restores proper blade concentricity and reduces wobble
• Maintains correct belt path and tension when pulleys match OEM size
• Helps prevent premature wear to blades and belts caused by misalignment

Who this is for: This PetMigo 54" spindle assembly is aimed at homeowners, landscapers and service technicians who own or repair 54"-deck riding mowers and zero-turns across Cub Cadet, MTD, Troy-Bilt, Columbia and Craftsman/White Outdoor lines. Choose this part if your original spindle shows play, noisy bearings, bent shaft or damaged mounting surfaces and you need a reliable OEM-dimension replacement to restore deck performance.