# Stairmaster 4000PT Stepper Spring Pulley White 21094 (MX401)

\## StairMaster 4000PT Stepper Spring Pulley White 21094 (MX401)

The StairMaster 4000PT Stepper Spring Pulley is a preowned replacement part for the StairMaster 4000PT stepper. It is designed to replace the original spring pulley component identified by part number 21094. This white pulley may help restore the correct component setup when an existing part is worn, damaged, missing, or no longer suitable for continued equipment use.

## Product Details and Benefits

This product is the StairMaster 4000PT stepper spring pulley, not a complete stepper machine or a full repair assembly. Its product identity is:

\- \*\*Brand:\*\* StairMaster  
\- \*\*Equipment:\*\* StairMaster 4000PT stepper  
\- \*\*Part name:\*\* Stepper spring pulley  
\- \*\*Part number:\*\* 21094  
\- \*\*SKU:\*\* MX401  
\- \*\*Color:\*\* White  
\- \*\*Condition:\*\* Preowned  
\- \*\*Serial number listed:\*\* 37486

The part has been carefully inspected by skilled technicians before sale. Inspection helps confirm that the component is suitable for continued use, although normal signs of previous use may be present because this is a preowned fitness equipment part.

Replacing only the required pulley can provide a practical alternative to replacing a larger machine assembly. It may also help extend the useful life of an existing StairMaster 4000PT stepper and reduce unnecessary equipment waste. Buyers who maintain commercial or home fitness equipment can use this type of replacement component when carrying out repairs or restoring a machine to working condition.

## Compatibility and Applications

The StairMaster 4000PT Stepper Spring Pulley White 21094 is intended for the \*\*StairMaster 4000PT stepper\*\*. It is a replacement component for the spring pulley used in that equipment model. The part number \*\*21094\*\* and listing SKU \*\*MX401\*\* provide additional identification when comparing this item with the component currently installed on your machine.

Use this part for StairMaster 4000PT stepper repair or replacement needs only when the model and component details match. The product page does not provide compatibility information for other StairMaster models or other brands, so do not assume that it fits different stepper machines.

\### Why Choose This Replacement Part?

A preowned StairMaster replacement part can help reduce repair costs compared with sourcing a complete machine or larger assembly. Reusing inspected fitness equipment components also supports a more sustainable repair approach by keeping usable parts in service and diverting them from disposal.

This item may suit equipment owners, fitness facility technicians, repair businesses, and individuals maintaining a StairMaster 4000PT stepper. Its exact model and part identification make it easier to compare against an original spring pulley before ordering.

## Before You Buy

Confirm that your equipment is a \*\*StairMaster 4000PT stepper\*\* and that the original component matches \*\*spring pulley part number 21094\*\*. Check the product name, white color, and part details against your existing pulley or service information. The product is preowned, and photographs are provided for reference only. Because multiple units may be in stock, the part may look slightly different from the pictured item. The seller states that the supplied component will be the exact model and part listed. Contact the seller if you need additional information before purchase.

## Details

- **Price:** 29.99 USD
- **Vendor:** Stairmaster
- **Type:** Miscellaneous
- **Tags:** All

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 29.99 USD | In stock |

## Images

- MX401
- MX401
- MX401
- MX401
- MX401

## Additional Information

- **Condition:** PREOWNED

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> Source: [Cardio Equipment Parts](https://www.cardioequipmentparts.com/products/stairmaster-4000pt-stepper-spring-pulley-white-21094-mx401)
> Updated: 2026-08-29