Deck Belt Tension Spring GX21582

For owners of a listed riding mower who need a deck belt tension spring, this two-piece replacement set focuses on the spring rather than a belt or a complete deck assembly.

The listing gives two part numbers, GX21582 and GX20377, and names a broad range of compatible mower models. That makes matching the part number and your exact model especially important before ordering.

If your mower’s belt-tension system needs a spring, would replacing that part alone be a better fit than buying a larger assembly? That depends on what actually needs replacement.

How to use it

These are deck belt tension springs intended for the mower models named in the listing. They are a parts-replacement purchase, not a complete repair kit: the package includes two springs, and no belt or other deck components are listed. You’ll appreciate it if you have identified the spring as the part you need and want the pair supplied together.

The fit list includes G110, L120, L130, LA130, LA140, LA145, LA150, LA155, LA165, LA175, L2048, L2548, 145, 155C, 190C, D140, D150, D155, D160, D170, E140, E150, E160, E170, E180, S140, S160, S170, S180, X140, X165, X166, and X167. The listing also names X140 and several other models more than once. Treat that list as a starting point, not a substitute for matching the part number to your mower, no year or serial-number guidance is provided. Without having tried it, the practical limitation is clear: this set won’t address a worn belt or another damaged deck component by itself.

Pros

• Two springs are included, useful when you need the supplied pair rather than a single spring.
• Both GX21582 and GX20377 are stated as part numbers, giving you specific identifiers to compare with the part you are replacing.
• The compatibility list covers many L, D, E, S, and X mower models, including L120, D160, and X140.

It may not suit you if you need the belt, a full deck assembly, or confirmed fitment guidance for a particular mower year. The listing does not provide dimensions, spring material, installation instructions, or a breakdown of model-year compatibility, so don’t assume that a model-family match alone settles fit.

Spec sheet

• Name: Deck belt tension spring
• Type: Riding mower replacement spring
• Format: Two-piece package
• Part numbers: GX21582, GX20377
• Compatible models: G110, L120, L130, LA130, LA140, LA145, LA150, LA155, LA165, LA175, L2048, L2548, 145, 155C, 190C, D140, D150, D155, D160, D170, E140, E150, E160, E170, E180, S140, S160, S170, S180, X140, X165, X166, X167

Buying verdict

This set makes sense when you’ve matched GX21582 or GX20377 to the deck spring you need and want two replacement springs. It’s a narrower purchase than replacing a whole belt or deck assembly, which can be useful when the spring alone is the identified problem. If the repair diagnosis is uncertain, or your mower’s exact fit cannot be confirmed from the listed models and part numbers, choose a replacement with clearer fitment information before committing.