New 5I8401 Hydraulic Piston Replacement suitable for Caterpillar Equipment

$47.03
In Stock • Ships Today • Order By 3pm ET
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Description for 5I8401 Piston-piston Pump

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This aftermarket Caterpillar 5I8401 Piston-piston Pump 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 Caterpillar Piston-piston Pump.
Direct Replacement: Engineered for a precise fit in Caterpillar equipment.
OEM-Spec Quality: Manufactured to match the performance of your original part.
Tested Reliability: Strict quality checks are performed before shipping.

Specification for 5I8401 Piston-piston Pump

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Replacement Part Number(s): 5I-8401
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: 0.92 LBS | 0.42 KG
Dimensions: 4.53 x 2.17 x 2.17 (inches)
Condition: New

Exact Fit Guarantee for 5I8401 Piston-piston Pump

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Looking for a reliable replacement Caterpillar 5I8401 Piston-piston Pump ? Order with confidence through our Exact Fit Guarantee.
Verified Fit: Before we ship, we check your part against CAT SIS (Caterpillar Service Information System) to confirm it's the correct match for your machine.
Peace of Mind: If it isn't the right fit, we'll contact you with the correct Caterpillar part number before your order goes out.
Exclusive Guarantee: Enroll in our Exact Fit Guarantee at checkout to ensure you get the part you need the first time.
Reviews

Customer Reviews

★★★★★

Great pricing and fast shipping!
I'll admit that I was skeptical of propel parts, but they are an honest site and came through with the order. I was skeptical because I've never ordered heavy machinery parts, and didn't know who to trust. The parts that I ordered showed in stock, but after checking with their vendor, they only had half of the order in stock. I was notified the day after the order, and most of the parts arrived in a few days. There was one part that was not shipped putz but I was able to talk with who I assumed is the owner who rectified the situation and had the part overnighted to me.

I will say that communication speed could use a little work, but they will eventually get back with you.

★★★★★

rapid response!

★★★★★

Australian buyer, sales where professional and very responsive with secure parts identification.
Highly recommend.
Bedrock Exploration Pty Lt, Australia

Customer Follow-Up After Delivery:

Thank you Deb and your colleague Anthony A for your help in supplying a replacement part which arrived in good time and is running smoothly.
I shall continue to use your services and recommend you to other remote miners, as your services and delivery times are better than our home-based suppliers.
With thanks again.
Regards, Gerard

★★★★★

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.

★★★★★

I own old cat bulldozers D8k,D8H,D8N that required frequent repairs and servicing. it was erratic and practically cumbersome to keep them running without constant supply of reliable
and affordable spares in Uganda a third world country however,since I started dealing with propel parts US,my bulldozers have earned reliability and efficiency in providing high quality services to clients and making me a great dependable construction company in earth moving.
My shipments are always handled expeditiously and delivered in record time to Uganda this is awesome from Propelparts.
My business is booming by the clock for finding the best partner in Propelparts.

★★★★★

Customer service was great! There was a small problem with the part and they responded quickly and respectfully until was resolved! Highly recommended

★★★★★

Excellent and prompt response.
Propel parts team helped me greatly regarding a special request and I always get prompt response.
They’re fantastic!

★★★★★

Prompt service, Friendly people and hassle free

★★★★★

When I had questions, they were answered quickly and kindly.

Thank you!!

★★★★★

Grateful I found this company!
I’m grateful I found this company! They answer the phone every time plus the parts are packaged very well!! Even the angriest mailman couldn’t damage your parts! lol The parts showed up as planned and for being aftermarket the quality seems to be good!! The warranty is the same as CAT. Thank you Daniel!!!

Product Questions

Frequently Asked Questions

What is the Caterpillar 5I8401 hydraulic piston used for?

The Caterpillar 5I8401 hydraulic piston is a high-quality aftermarket replacement designed for hydraulic pump applications in Caterpillar equipment. It is manufactured to meet or exceed OEM specifications for dependable hydraulic performance and long-lasting durability.

What are the benefits of the 5I8401 hydraulic piston?

  • Supports dependable hydraulic pump operation
  • Helps maintain smooth hydraulic system performance
  • Manufactured from durable materials for long service life
  • Designed to meet or exceed OEM specifications
  • Suitable for demanding heavy-duty equipment applications

Is the 5I8401 hydraulic piston compatible with multiple Caterpillar machines?

Yes, this hydraulic piston may fit various Caterpillar equipment models depending on the hydraulic pump configuration and application. If you are unsure don’t hesitate to reach out to Propel Parts for help verifying fitment.

Why is replacing worn hydraulic pistons important?

Replacing worn hydraulic pistons helps maintain proper hydraulic pressure, improve system efficiency, and reduce premature wear on connected hydraulic components.

Does the 5I8401 hydraulic piston meet OEM standards?

Yes, this aftermarket replacement is designed to meet or exceed OEM specifications for fit, durability, and dependable hydraulic performance.

Can a damaged hydraulic piston affect equipment performance?

Yes. A damaged or worn hydraulic piston may contribute to pressure loss, reduced hydraulic efficiency, poor system response, and increased maintenance needs.

Are related Caterpillar hydraulic components available from Propel Parts?

Yes. Propel Parts offers a wide selection of hydraulic replacement components for Caterpillar equipment. You can also explore the Caterpillar Equipment Seal O-Ring 6L1650 for another related hydraulic sealing solution.

Questions About this Part?
Have a question about fit, compatibility, shipping, warranty, or returns?
Shipping | 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.

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