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New 4D9986 Seal O Ring Replacement suitable for Caterpillar Equipment
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Description for 4D9986 Seal O Ring
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Customer Reviews
Great service!
Awesome and diligent support. Would definitely recommend
Excellent experience.
Mike has been very helpful. I am looking forward to keep doing business with them
Steven & Propel Parts were a huge help! We were able to place a large order and get it shipped out same day to avoid a line down situation for a customer due to a lost component. The order was even submitted after the 3pm cutoff for same day shipments and we got it the next morning!
The customer care response was very awesome. It was more than what I expected
The customer care response was very effective and timely
The response time was amazing
The availability of most of the parts that I wanted was also very awesome
Thanks keep it up
Our CSR for Dymax Inc., Deb, has been extremely helpful and consistently provides quick, accurate information regarding parts and inventory. When we encounter difficulties finalizing transactions through the internal website, she is able to promptly generate quotes and provide an external, secure method for payment. Her responsiveness and willingness to assist play a key role in supporting our team’s success.
Quality Caterpillar parts
Very fast delivery and respons from Propel Parts
This is my second time that I bought something from it, first time delivery time was in one week from US to Serbia
Propel parts is a good Cat vendor that provides a top notch service to customers from ordering to delivery. Their after sales service is really impressive.
The best supplier ever we mainly deal with most rare needed parts .. i highly recommend .. they are very very honest
Prompt service, Friendly people and hassle free
Product Questions
Frequently Asked Questions
What is the Caterpillar Seal O-Ring 4D9986 and what does it do?
The 4D9986 O-ring seal is a precision-engineered circular sealing element made from durable elastomeric material. For the complete selection of O-ring seals for heavy equipment, visit our seals category.
Which Caterpillar equipment models is the 4D9986 compatible with?
The 4D9986 O-ring is designed for use across a broad range of Caterpillar equipment. Always verify using your equipment's serial number and service manual before ordering.
How do I know when my O-ring needs replacing?
Common signs include:
- Visible fluid leaks around fittings, ports, or connectors
- Staining or residue buildup near sealing points
- Pressure drops in hydraulic or fuel systems
- Swelling, cracking, or flattening of the seal when inspected during service
How do I properly install the 4D9986 O-ring seal?
Clean the groove and mating surfaces, lightly lubricate the O-ring, seat it evenly without twisting, and tighten fittings to the specified torque. A twisted or pinched O-ring is the most common cause of premature seal failure.
Is the 4D9986 a high-quality aftermarket part?
Yes ??? this is a premium aftermarket O-ring seal that meets or exceeds OEM specifications. For related engine sealing components, visit our engine sealing components category.
What materials are used in this O-ring?
The 4D9986 O-ring is manufactured using high-grade elastomeric compounds, often featuring a PTFE coating that reduces installation friction and extends operational life.
What is the warranty on the 4D9986 O-ring from Propel Parts?
All parts sourced through Propel Parts come backed by a 12-month warranty. Orders placed on weekdays by 3:00 PM ET ship the same day, and Propel Parts ships to over 90 countries worldwide.
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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