Idler Pulley for 532173437 532165888, Craftsman Husqvarna AYP LT1000 LT2000 Lawn Mower Tractor with 42" Deck 532131494 532173438 165888

What It Is

This idler pulley (OEM #532173437 / 532165888 / 165888) guides and tensions the drive belt on 42-inch cutting decks found on Craftsman, Husqvarna, and AYP lawn tractors like the LT1000 and LT2000 series. It reduces belt wear and maintains consistent blade engagement.

Fitment & Compatibility

Before buying:

• Deck size: Fits 42-inch stamped steel decks only. Measure your deck width—will not fit 46" or 54" decks.
• Model numbers: Confirmed fit for Craftsman LT1000, LT2000, and Husqvarna YTH models with 42" decks. Also replaces OEM #532131494, 532173438, and 165888.
• Measurements: Pulley diameter is 4 inches (outside) with a 3/8-inch wide groove for standard A/B-section belts. Spindle bore is 5/8 inch.
• OEM vs aftermarket: This is an aftermarket replacement. Verify your original pulley matches these dimensions—some OEM pulleys have a smaller bore or different shoulder height.

Key Things to Know

• Quality: Metal construction with sealed ball bearings. Holds up well in moderate use, but not commercial-grade.
• Installation difficulty: Easy—one bolt (usually 5/8" or 1/2" hex). Remove belt, swap pulley, reinstall belt. No special tools needed.
• Common gotcha: The pulley may come with a spacer washer. Reuse your original washer stack if the deck bracket needs it—otherwise belt alignment will be off.
• Belt compatibility: Works with 42" deck belts (commonly 92-93 inch Kevlar or standard A-section belts). Check your belt part number before ordering.

Should You Buy It

If your 42-inch Craftsman or Husqvarna tractor deck pulley is wobbling, squeaking, or has a seized bearing, this is a solid, affordable fix. It’s not for heavy commercial use, but for residential mowing it’ll restore smooth belt operation without breaking the bank. Just confirm your deck size and pulley bore first.