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New 4D9986 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.
Description for 4D9986 Seal O Ring
â–¶Specification for 4D9986 Seal O Ring
â–¶Exact Fit Guarantee for 4D9986 Seal O Ring
â–¶| Dimensions | 1.18x1.18x0.12 |
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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. -
I put 2 of the same orders in due to a web page error and shortly after I was contacted by Deb from customer service asking if I meant to place both orders. She was very helpful, the email was very well written and it genuinely made me feel better about the whole experience. She resolved the issue quickly and with there not being much of customer service these days I was very happy so see that is not the case everywhere!!!
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Quick Response. Very much appreciated.
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To my country the company is doing great
The products they market is good and
Affordable.
They can delivery to any country, stree free.
Tested and trusted. -
Great people! Good and fast service. Always looking to help get what you need! 10/10 ????????
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
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.
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
