GELASKA AUC16698 Idler Pulley Replaces AM106627 AM121602 for John Deere Z225, Z245, Z425, Z445, Z465, Z510A, Z520A, Z625, Z645, Z655, Z665, LT150 LT155 LT160 LT166 LT170 LT180, X300 X320 Tractors

What It Is

The GELASKA AUC16698 idler pulley is a replacement tensioner pulley for the mower deck belt drive system on select John Deere residential zero-turn mowers and lawn tractors. It maintains proper belt tension to prevent slipping or throwing during cutting.

Fitment & Compatibility

Before buying, confirm your model and deck size. This pulley fits John Deere Z225, Z245, Z425, Z445, Z465, Z510A, Z520A, Z625, Z645, Z655, Z665 zero-turns, plus LT150–LT180 and X300/X320 tractors. It replaces OEM parts AM106627 and AM121602. Measure your existing pulley: this one has a 4.5-inch outer diameter, a 5/8-inch bore, and a 1-inch overall height. Check that your deck uses a flat idler (not a v-groove) and that the bearing is a standard 6202RS. If your model uses a different bore size or offset, it won’t fit.

Key Things to Know

• Quality: Users report it’s a solid aftermarket alternative to OEM, with sealed bearings that hold up well in normal residential use. Some note the bearing may be noisier than OEM after heavy use.
• Installation: Easy—typically a single bolt and washer. Use thread locker on the bolt to prevent loosening. No special tools needed.
• Gotcha: Check that your belt is correctly routed after replacement. A misaligned pulley can cause rapid belt wear or throwing.
• Durability: Not designed for commercial duty; heavy or frequent mulching may wear the bearing faster than OEM.

Should You Buy It

If you need a quick, affordable fix for a worn idler pulley on a residential John Deere deck and don’t want to pay OEM prices ($25–35), this is a solid choice. It’s best for DIY homeowners who can handle a simple bolt swap. Skip it if you run a commercial operation or need the absolute longest bearing life.