Aeagle RZT50 Spindle Assembly for 918-04126 918-04125 for MTD Cub Cadet RZT50 ZT50 LT1050 LGT1050 LTX1050 SLT1554 i1050 Mustang 50 XP Replace 618-04126 618-04125 (3 Pack)

What It Is

This is a 3-pack of replacement spindle assemblies for 42–50-inch MTD/Cub Cadet zero-turn and lawn tractor decks. The spindle holds the blade and pulley, transferring engine power to cut grass. It’s designed for heavy residential use and fits dozens of models like the RZT50, ZT50, LT1050, and Mustang 50 XP.

Fitment & Compatibility

• Check your deck size and model: This fits 42-inch to 50-inch decks on MTD-built Cub Cadet, Troy-Bilt, and Craftsman models. Specific compatible models include RZT50, ZT50, LT1050, LGT1050, LTX1050, SLT1554, i1050, and Mustang 50 XP.
• OEM cross-references: Replaces OEM part numbers 918-04126, 918-04125, 618-04126, and 618-04125. Verify your old spindle’s stamped number matches one of these.
• Measure your bolt pattern: This assembly uses a standard 4-bolt pattern with 4.5-inch center-to-center spacing. Measure yours to confirm—some older decks may differ.
• Deck depth matters: This spindle is for 3.5-inch-deep decks. If your deck is 4.25 inches deep, you need a different spindle (e.g., 918-05112).

Key Things to Know

• Quality vs. OEM: The Aeagle is a solid aftermarket option. It uses sealed bearings and a steel housing, but the pulley may be slightly thinner than OEM. Fine for residential mowing, but not for heavy commercial use.
• Installation difficulty: Moderate. You’ll need a socket set, a jack or blocks to lift the deck, and a blade removal tool. Expect 30–60 minutes per spindle if you’ve done it before.
• Common gotcha: The included bolts are often too short for thicker decks. Reuse your original bolts if possible, or buy longer Grade 8 hardware (M10-1.5 x 30mm).
• Warranty: This 3-pack comes with a 1-year warranty. OEM spindles typically have a 2-year warranty, but cost 2–3x more per spindle.

Should You Buy It

If you have a compatible MTD/Cub Cadet residential mower and want to replace worn-out spindles without paying OEM prices, this is a good value. It’s not for commercial mowers or decks with deeper housings. For the price of one OEM spindle, you get three—and the quality is sufficient for most homeowners.