GELASKA 2 Pack 131494 Idler Pulley Craftsman Replaces 165888 532173437 532173438 597025001 532165888 532131494 532155191 for Craftsman 42 inch LT1000 LT2000 YTH18542 YTH1542XP YTH150 Mowers

What It Is

This is a replacement idler pulley for the belt drive system on Craftsman 42-inch lawn tractor decks. It guides and tensions the deck belt to keep the blades spinning properly, and it’s a common wear item on older Craftsman mowers.

Fitment & Compatibility

Before buying, confirm your mower has a 42-inch stamped steel deck (not fabricated). This pulley fits Craftsman LT1000, LT2000, YTH18542, YTH1542XP, and YTH150 series tractors, plus many other models using the OEM numbers listed. Measure the pulley: it should be 4 inches outer diameter with a 5/8-inch bore and a 3/8-inch groove for the belt. The pulley is sold as a 2-pack—each pulley is identical, so you can replace both idlers if your deck has two. Check your deck’s belt diagram; this pulley is often the flat idler (not the spring-loaded tensioner pulley). If your OEM part number is 131494, 165888, 532173437, 532173438, 597025001, or 532155191, this is the correct match.

Key Things to Know

• Quality: Made of stamped steel with a sealed ball bearing. Users report it holds up well for the price, but it’s not as heavy-duty as OEM Craftsman pulleys. Expect 2–3 seasons of normal use.
• Installation: Simple—remove the old pulley bolt, swap the pulley, and tighten to about 25–30 ft-lbs. No special tools needed. The pulley comes with a hex nut and bolt, but you may reuse your original hardware if it’s in good shape.
• Common Gotcha: The bearing is sealed and non-serviceable. If you hear squeaking or wobbling after installation, the pulley may be defective—check the bearing spin before mounting.
• Fitment Check: Some Craftsman 42-inch decks use a different pulley size (e.g., 3.5-inch or 4.5-inch). Measure your old pulley’s outer diameter and bore to avoid a mismatch.

Should You Buy It

This is a solid budget option for DIY homeowners with a 42-inch Craftsman tractor deck who need a quick, direct replacement for a worn idler pulley. It’s not built for commercial use, but for occasional mowing and basic maintenance, it’s a reliable, cost-effective choice. If you want OEM durability, stick with the Craftsman-branded pulley.