51537200 51528000 Mower Spindle for Ariens Ikon-X 52 Ikon-XD 52 Ikon-XL 52 Lawn Mower Deck Spindle Assembly for Gravely ZTX 52 ZT XL 52 with 52-Inch Decks, 3 Set

What It Is

This is a set of three replacement spindle assemblies for 52-inch mower decks on Ariens Ikon-X, Ikon-XD, and Ikon-XL models, as well as Gravely ZTX 52 and ZT XL 52 zero-turn mowers. Each spindle houses the bearings and shaft that drive the mower blade; you need all three to replace worn or failed spindles on a 52-inch deck.

Fitment & Compatibility

Before buying, confirm your deck is exactly 52 inches (measured blade tip to blade tip). This set is a direct replacement for OEM part numbers 51537200 and 51528000. It fits these specific models:

• Ariens: Ikon-X 52, Ikon-XD 52, Ikon-XL 52
• Gravely: ZTX 52, ZT XL 52

What to check:

• Measure the spindle shaft diameter (typically 1 inch) and bolt pattern (usually 4-bolt, 3-inch center-to-center). Compare with your old spindle.
• Verify the pulley bore size matches your deck’s pulley (commonly 5/8-inch or 3/4-inch keyed shaft).
• Inspect the blade mounting hole pattern (usually a 5-point star or 2-hole pattern) to ensure your blades fit.

If your mower uses a different deck size (e.g., 48-inch or 60-inch) or a different model series, this set will not fit.

Key Things to Know

• Quality concerns: With a 3.5/5 rating from only 6 reviews, some users report premature bearing wear or noise after a season. Check for metal shavings in the grease upon arrival—this can indicate poor internal machining.
• Installation difficulty: Moderate. You’ll need a socket set, a puller for the pulley (if seized), and a torque wrench (common spec: 40-50 ft-lbs for spindle bolts). Expect 1-2 hours for all three.
• Common gotchas: The spindle housing may be slightly taller than OEM, requiring you to adjust the deck belt tension. Also, the included bolts may be softer than factory—use thread locker and re-torque after 5 hours of use.
• Warranty: Usually 1 year from the seller (confirm before purchase). No OEM branding—this is an aftermarket part, so Ariens/Gravely dealer support won’t apply.

Should You Buy It

If you need a budget-friendly, all-in-one spindle replacement for a 52-inch Ariens or Gravely deck and you’re comfortable with moderate DIY work, this set can save you money over OEM (which can cost $50-70 per spindle). But if you want maximum durability or a factory warranty, stick with genuine Ariens/Gravely spindles—especially if your mower sees heavy commercial use.