04120-21751 Engine Belt for Komatsu

$35.73
Call +1-877-228-3765 for availability
Excellent on Trustpilot
Fit Guarantee

Exact Fit Guarantee

This part is guaranteed to fit your machine.

Wrong Part

Wrong Part?

We'll overnight correct part at no cost to you.

SKU
04120-21751

Description for 04120-21751 Engine Belt

â–¶
This aftermarket Komatsu 04120-21751 Engine Belt is built to meet U.S. OEM specifications for durability and performance. At Propel Parts, we perform strict quality checks to ensure it fits and functions like your original Komatsu Engine Belt.
Direct Replacement: Engineered for a precise fit in Komatsu equipment.
OEM-Spec Quality: Manufactured to match the performance of your original part.
Tested Reliability: Strict quality checks are performed before shipping.

Specification for 04120-21751 Engine Belt

â–¶
Specifications: Aftermarket Part | US OEM Specs.
Shipping: Same Day (Weekdays) | Order by 3pm.
Warranty: Unlimited Mileage | 1 Year Warranty.
Core: No Core Required | No Core Charge.
Weight: 0.50 LBS | 0.23 KG
Dimensions: 22.44 x 5.71 x 0.98 (inches)
Condition: New
More Information
Dimensions 22.44x5.71x0.98
Customer Reviews
  1. 100%
    Great affordable option for aftermarket parts
    Found Propel Parts while looking for parts to repair a D6C dozer that has been sitting for 20 years. Great parts, great prices, fast shipping and excellent customer service.
  2. 100%
    A Delay Handled the Right Way
    Honestly, if I were in Miami like my shipment was, I wouldn?t have been in a hurry to ship out either. I was frustrated at first ? delays cost me time on the job ? but Propel Parts stepped up.

    Deb, Daniel and the team owned the mistake, kept the communication clear, and graciously refunded my shipping costs without making it a hassle. That kind of accountability is rare these days, and I genuinely appreciated how they handled it.

    Things don?t always go perfectly, but these folks proved they?re more interested in doing right by their customers than just pushing parts out the door. Solid company, solid people.

    ? Jimmy Spong
    Hartco Mobile Welding

    P.S. Incredible quality on the pin as well. I had to do some custom modifying, and let?s just say the case hardening was ? well ? hard. Great Stuff! Thank you.
  3. 100%
    Have been buying parts from them for years, and they have always delivered, both with parts and customer service.
  4. 100%
    This is a great company to work with. Our sales associate Anthony quickly located the correct part and sent it out right away.
  5. 100%
    La mejor experiencia y calidad
Write Your Own Review
You're reviewing:04120-21751 Engine Belt for Komatsu
Your Rating
Customer Questions and Answers
What’s the difference between #04120-21751 and #04120-21750 ?
Asked by D
Hello, The difference between 04120-21750 and 04120-21751 is the belt length. Although they are the same V-belt type, they are not interchangeable. Please use the part number specified for your Komatsu model or engine serial number. Kind regards...
Answered by Propel Parts
Questions About this Part?
Have a question about fit, compatibility, shipping, warranty, or returns?

Shipping

We know equipment downtime costs money, so fast and reliable shipping is a priority at Propel Parts. Orders placed on weekdays before 3:00 PM ET typically ship the same day, with expedited delivery options available for many locations when time is critical.

We ship across the U.S., Canada, and over 130 countries worldwide, helping customers keep machines running wherever they operate. Available shipping methods and delivery estimates are shown at checkout so you can select the option that best fits your timeline.

Tracking information is emailed within 24–48 hours after your order is processed, giving you full visibility from dispatch to delivery and peace of mind that your parts are on the way.

Easy Returns

Our refund policy is simple. We offer a 30-day, no-hassle return policy, and we make every effort to provide the best service and highest-quality parts possible. If you’re not fully satisfied with your purchase, you may return it within 30 days for a refund. Full details are available on our Returns Policy page.

Warranty

Buy with confidence. All parts from Propel Parts are covered against material or manufacturer defects for 12 months from the original invoice date. We stand behind every part we sell, so you can count on reliable performance and dependable support. Full details are available on our Warranty Policy page.

Exact Fit Guarantee®

The right part — or we'll make it right.

1

Order Normally

Know your part number?
Simply place your order.

2

Not Sure?

Place your order, then send us your serial number before it ships.

We'll verify fit.
3

We Make It Right

Wrong part? We'll make it right.

Fast. At our expense.