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New 4J0519 Seal O Ring Replacement suitable for Caterpillar Equipment
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Description for 4J0519 Seal O Ring
â–¶Specification for 4J0519 Seal O Ring
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Customer Reviews
Great service They respond back very fast always try…
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Been working with them 4 years and hopefully many more
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Always helpful and great pricing
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.
He was a great help with ordering and refunding the sales tax,
Good service, quick response.
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!
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!
I’ve been ordering parts from propel for about 3 years & counting. I live in Hawaii where we have a hard time getting parts especially for decent prices with fast shipping. I've been 100% satisfied with the company and the customer service and will continue to use them. I recommend propel to everyone here in Hawaii and we are all happy to have you guys. Thank you!!!
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Product Questions
Frequently Asked Questions
What is the Caterpillar O-Ring 4J0519?
The 4J0519 is a precision O-ring seal used in Caterpillar hydraulic, fuel, and cooling systems to prevent fluid leakage at connection points, fittings, and component interfaces across a wide range of equipment.
What equipment is the 4J0519 O-ring compatible with?
This is a widely used O-ring across many Caterpillar machine families and engine platforms. Always cross-reference with your parts manual to confirm the correct application. Please reach out to Propel Parts for help verifying fitment if needed.
What are signs the 4J0519 O-ring has failed?
Look for:
- Fluid seeping or dripping at the sealed joint
- Visible deterioration — cracking, hardening, or compression set
- Recurring leaks after tightening hardware
- Discoloration or swelling from chemical incompatibility
These signs indicate immediate replacement is needed to prevent system damage.
What material is the 4J0519 O-ring made from?
The 4J0519 is manufactured from nitrile rubber (NBR) or a compatible high-performance elastomer that meets or exceeds OEM specifications for petroleum fluid compatibility, temperature resistance, and compression characteristics.
How should I install the 4J0519 correctly?
Always clean the groove and mating surfaces before installation. Lightly lubricate the O-ring with clean system fluid. Install without twisting and confirm it is fully seated before assembly. Torque mating fasteners to spec to avoid over-compression.
Is this a premium aftermarket O-ring?
Yes. The 4J0519 from Propel Parts is a high-quality aftermarket O-ring designed to meet or exceed OEM performance expectations. It is manufactured to exact dimensional and hardness specifications for reliable sealing in Caterpillar equipment.
Browse our complete selection of seals and gaskets for Caterpillar hydraulic and fuel systems.
Can I purchase this O-ring as part of a seal kit?
In many cases, yes. Seal kits are available that include multiple O-rings and seals for a complete system service. This is often more economical and ensures all seals are replaced at the same time.
Check our seal kits to find bundled options that include the 4J0519 and related seals.
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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.
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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.
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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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