3 Pack 918-06978 Spindle Assembly with 756-05034A Idler Pulley 954-04329A Belt 5/8x149 490-900-M061 Deck Wash Kit Replace 618-06978 918 06978 for Cub Cadet 54 inch XT1 ST54, XT2 GX54 Mowers

What It Is

This is a complete replacement spindle assembly kit for 54-inch Cub Cadet XT1 and XT2 mowers, including three spindles, one idler pulley, one 5/8 x 149-inch drive belt, and a deck wash kit. It’s designed to restore blade drive function when spindles wear out, pulleys seize, or the belt stretches or breaks.

Fitment & Compatibility

Check your deck size first – this kit is only for 54-inch decks. It fits Cub Cadet XT1 ST54 and XT2 GX54 models. OEM part numbers replaced are 918-06978 (spindle assembly), 756-05034A (idler pulley), and 954-04329A (belt). Measure your existing belt length (should be 5/8 x 149 inches) and spindle bolt pattern (typically 3-bolt, 2.5-inch spacing). Verify your deck’s pulley diameter and belt routing diagram – some XT2 decks use a different idler arm. This is an aftermarket kit, not OEM Cub Cadet, so check that the deck wash port fits your deck housing (most 54-inch decks have a standard 1/4-inch quick-connect fitting).

Key Things to Know

• Installation difficulty: Moderate. You’ll need a socket set, jack or blocks to lift the deck, and a breaker bar for spindle bolts. Expect 1–2 hours for all three spindles.
• Common gotcha: The idler pulley bracket may not align perfectly with early XT2 decks – you might need to slot the mounting hole slightly or reuse your original bracket if the bolt pattern mismatches.
• Quality note: Aftermarket spindles are typically fine for residential use, but the bearings may not last as long as OEM (3–5 years vs 5–7 years on light use). The belt is standard 5/8-inch Kevlar-reinforced; it’s a direct replacement.
• Deck wash kit: Included, but it’s a basic brass fitting – if your deck has a pre-drilled port, it’s plug-and-play. If not, you’ll need to drill and tap, which is not covered in the instructions.

Should You Buy It

This kit is a solid value if you need to replace multiple spindles and the belt at once on a 54-inch Cub Cadet XT1 or XT2. It saves you from buying each part separately and includes a bonus deck wash kit. Skip it if you have an older XT2 with a different idler pulley bracket, or if you want OEM parts for maximum longevity. For standard residential mowing, it’ll get your deck cutting smoothly again without breaking the bank.