618-0138 615-0142A 618-0142 918-0138C 918-0142C Lawn Mower Spindle Assembly Fit for MTD L13 LT15 LT13 LT14 LT145 LT135 LT1300 LT1450(2 Pack)

What It Is

This is a 2-pack of replacement lawn mower spindle assemblies designed for MTD-branded tractors and zero-turn mowers. The spindle houses the bearings and pulley that spin your mower blade, and it’s a direct swap for worn or failed OEM units on select L-series models.

Fitment & Compatibility

Before buying, confirm your mower’s model number (find it under the seat or on the frame). This spindle fits MTD models L13, LT15, LT13, LT14, LT145, LT135, LT1300, and LT1450. Also compatible with OEM part numbers 618-0138, 615-0142A, 618-0142, 918-0138C, and 918-0142C. Measure your deck’s spindle bolt pattern (typically 3.25” center-to-center) and check the shaft diameter (usually 5/8”). If your deck uses a 1” shaft or a different bolt spacing, this won’t fit. The aftermarket design matches OEM dimensions but may vary slightly in pulley height—compare your old pulley stack.

Key Things to Know

• Quality: Budget-friendly aftermarket set. Bearings are sealed but not heavy-duty; fine for residential use on 42–46” decks, but may wear faster on commercial or rough terrain.
• Installation: Moderate difficulty. You’ll need a socket set, jack/stands, and possibly a puller for stubborn spindles. Remove the deck, unbolt the old spindle, transfer the pulley and blade, then bolt in the new one. Torque to 30–40 ft-lbs.
• Common gotcha: The included bolts may be slightly different length than OEM—check that they don’t bottom out in the housing. Use thread locker on the pulley nut.
• Pack size: You get two spindles, so it’s a good deal if you need to replace both sides. If only one is bad, keep the spare for future use.

Should You Buy It

If you have a compatible MTD L-series mower and your deck is vibrating, blades are uneven, or the spindle is seized, this 2-pack is a cost-effective fix for residential use. It’s not built for heavy commercial abuse, but for the price, it’s a solid replacement that will get you cutting again.