New 8M8157 Seal O Ring Replacement suitable for Caterpillar Equipment
- New Seal O Ring Replacement suitable for Caterpillar Equipment
- Made to USA Specification
Buy with Confidence: All parts are covered by our warranty
Exact Fit Guarantee
This part is guaranteed to fit your machine.
Wrong Part?
We'll overnight correct part at no cost to you.
Exact Fit Guarantee®
×WILL PART FIT?
Yes, it will fit! We offer an Exact Fit Guarantee® or
get your money back.
HOW WE GUARANTEE, EXACT FIT
Before shipping your order, we use CAT SIS to ensure
this part is the exact fit for your equipment.
BUY WITH CONFIDENCE
Purchase with confidence because this part includes a
1 year warranty and it's guaranteed to fit & perform.
Description for 8M8157 Seal O Ring
â–¶Specification for 8M8157 Seal O Ring
â–¶Exact Fit Guarantee for 8M8157 Seal O Ring
â–¶| Dimensions | 0.57x0.57x0.12 |
|---|
-
Paul Godfrey Jr (Pennsylvania, USA)100%Great customer service
I didnt order enough parts i called and they work with me to update my order so i didnt have to pay a double shipping fee saving me some money -
Viviana Hein (Argentina)100%Original Review (Spanish)
Si necesitas piezas de repuesto a buen precio para tu m?quina grande y quieres un servicio al cliente atento, esta tienda es una muy buena opci?n.
English Translation
If you need affordable replacement parts for your heavy equipment and want attentive customer service, this store is a very good option. -
Ndaula moses kitayimbwa (Uganda)100%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. -
TEHR100%BEST for Heavy Equipment Parts.
Awesome quality products! Better customer service! Steven is always a pleasure to work with and very prompt in assisting me - thank you! -
David Lisiecki (Michigan, USA)100%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.
Frequently Asked Questions
What is the Caterpillar 8M8157 seal O-ring used for?
The 8M8157 seal O-ring is designed to help prevent fluid leaks and maintain proper sealing in Caterpillar hydraulic and engine systems.
What are common signs of a worn O-ring?
- Fluid leakage around fittings or components
- Cracking, flattening, or hardening of the seal
- Reduced system pressure or contamination issues
Is the 8M8157 O-ring compatible with multiple Caterpillar machines?
Yes, this O-ring may fit various Caterpillar equipment applications depending on the system configuration. Check your manual or reach out to Propel Parts for help verifying fitment.
Why is proper sealing important in heavy equipment?
Proper sealing helps maintain system pressure, reduces contamination risks, and supports reliable equipment performance in demanding environments.
Can extreme operating conditions affect O-ring lifespan?
Yes. Heat, pressure fluctuations, chemicals, and heavy-duty operating conditions can gradually wear down sealing materials over time.
Are aftermarket O-rings dependable for equipment repairs?
Yes. High-quality aftermarket sealing parts that meet or exceed OEM specifications can provide reliable sealing performance and durability.
Are there similar Caterpillar sealing products available?
Yes, related sealing components such as the Caterpillar 6V5391 seal O-ring may also be used in heavy equipment hydraulic and engine systems.

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.

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.

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.
Order Normally
Know your part number? Simply place your order.
Not Sure?
Place your order, then send us your serial number before it ships.
We'll verify fit.We Make It Right
Wrong part? We'll make it right.Fast. At our expense.
1 YEAR UNLIMITED WARRANTY
ORDER BY 3PM EST. EXCL. WEEKEND
NO CORE OR EXCHANGE CHARGES
EASY RETURNS & FAST REFUNDS
Worldwide Shipping







































































































