GELASKA AM136733 Spindle & UC26511 Pulley 2-Pack for John Deere X300 X304 X310 Z225 — Double-Sealed Bearings, OEM Fit

GELASKA 2Pack AM136733 spindle assemblies with UC26511/M151720 pulleys are a direct-fit aftermarket deck rebuild kit engineered to replace worn spindles and pulleys on John Deere X300, X304, X310 and Z225 mower decks.

Restore cutting performance and deck reliability with this two-piece spindle and pulley set by GELASKA. Each kit includes AM136733-type spindle assemblies featuring double-sealed bearings plus matching UC26511/M151720 pulleys sized to match original equipment dimensions. The components are designed to fit common John Deere residential models and sub-models so you can perform a complete deck spindle refresh without sourcing multiple parts.

How will replacing the spindle assembly improve my mower’s cutting?

Worn or damaged spindles cause blade wobble, uneven cuts and accelerated wear on blades and belts. Installing new AM136733 spindles restores true blade rotation, reduces vibration, and helps maintain correct deck alignment.

• Double-sealed bearings retain lubrication longer for smoother rotation.
• Correct spindle height and width dimensions to match factory geometry.
• Reduces blade wobble and uneven cutting patterns.

Will these parts fit my John Deere X300 / Z225 model?

The kit lists compatibility with John Deere X300, X304, X310 and Z225 models, including several Select Series and EZtrak variants. Always verify your tractor’s serial number and existing part numbers before ordering to ensure exact fitment.

• Fits X300 Select Series (PC9519) and X304 Select Series (PC9520).
• Compatible with X310 (PC10883) and Z225 EZtrak (PC9593) models.
• Cross-references AM137483, AM143469, AM134292 and related spindle numbers.

What are the key specifications I should know before installation?

Knowing spindle and pulley dimensions helps confirm compatibility and ensures belt alignment remains correct after replacement. The listed spindle and pulley dimensions match common OEM sizes to avoid clearance and belt tracking issues.

• Spindle height approximately 6-11/16" and width about 5".
• M151720 / UC26511 pulley: outer diameter ~5.35", inner bore ~0.60", height ~0.78".
• Double-sealed bearings for improved grease retention and longevity.

How do I know when it’s time to replace my spindle assembly?

If your deck shows blade wobble, noisy hub rotation, or visible bearing play, the spindle assembly may be failing. Replacement is recommended when wear causes vibration, excessive belt wear, or uneven mowing results.

• Signs: grinding noises, blade wobble or visible shaft play.
• Recommended when cutting quality declines or bearings leak grease.
• A full spindle and pulley kit simplifies deck rebuild and belt re-tensioning.

Who is this for: This GELASKA 2Pack AM136733 + UC26511 pulley kit is intended for DIY lawn equipment owners, small fleet managers and service technicians working on John Deere X300-series and Z225 residential mowers who need a cost-effective, OEM-dimension replacement for worn deck spindles. If you maintain deck performance and want a matched spindle-and-pulley set with double-sealed bearings, this kit is designed to get your mower back to reliable cutting quickly. Always double-check model numbers, years and part references before purchase to ensure correct fitment.