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Oil Sealing
We specialize in aftermarket seal kits compatible with brands such as Caterpillar, Komatsu, JCB, and John Deere. We offer B2B bulk order consultation and large-scale procurement services. With years of industry experience, we provide wholesale and long-term bulk supply services to our global business partners. Submit your bulk order details, and our professional B2B team will provide you with competitive pricing, fast delivery times, and customized supply solutions within 24 hours.
2R-0239 is an aftermarket NBR O-ring replacement referenced by Caterpillar as a 278.99 mm inside-diameter seal. Its listed cross-section is 3.53 mm (0.139 in), with a 75A nitrile material designation and a Dash Size 276 reference. This is an individual O-ring, not a hydraulic cylinder seal kit. It is used across multiple equipment and component groups, including hydraulic-control and heavy-equipment applications, so a machine model alone is not sufficient for identification. For purchasing accuracy, quote the original 2R-0239 part number and quantity; use dimensions as a secondary verification when checking the seal groove and application.
Part Number: 2R-0239
Compatible Brand: Caterpillar
Type: NBR O-Ring Seal
Manufacturer Type: Aftermarket replacement
Condition: New
Component type: Individual O-ring seal
Sealing duty: Static sealing and selected dynamic sealing positions
Material reference: NBR / nitrile, 75A
Reference dimensions: 278.99 mm ID × 3.53 mm cross-section
Selection guidance: Match the original 2R-0239 reference first; do not select solely by equipment model or nominal diameter.
Hydraulic Control: 153, 163
Excavators: 322, 322A, 325, 325A, 330, 330A, and 330L
Wheel Loaders: 966E, 966F, 966G, 988, 988G, 988H, 988K, 990, 992, 993, and 994
Off-Highway Trucks: 793, 793F, 794 AC, 796 AC, and 798 AC
Track-Type Tractors: D4H, D5H, D6D, D6H, D7G, D8N, and D8R
Vibratory Compactors: CP68B, CP74B, CP76B, CS76B, CS78B, and CS79B
Is 2R-0239 a complete seal kit?
No. 2R-0239 is a single O-ring. It should be ordered as an individual sealing component rather than as a hydraulic cylinder repair kit.
What are the dimensions of 2R-0239?
The official reference is 278.99 mm inside diameter with a 3.53 mm cross-section. It is also listed as a 75A NBR O-ring with a dash size of 276.
Can I select 2R-0239 by machine model only?
No. This O-ring is listed across many Caterpillar equipment families and component groups. The original part number is the best purchasing reference; inspect the groove and application when matching by dimensions.
Can Ruijueparts quote the O-ring from the original part number?
Yes. Send 2R-0239 with the required quantity for part-number matching. This is the most efficient approach for distributor replenishment and workshop purchasing.
Our aftermarket seal kits deliver a practical, cost-effective solution without compromising on real-world performance. We offer a lower upfront cost and reliable sealing for your daily maintenance and repair needs.
We stock seal kits across CAT, Komatsu, Volvo, JCB, Hitachi, Doosan, John Deere, Kubota, and 10+ other brands—one supplier for your whole fleet.
Ship under RuijueParts branding, neutral (unbranded) packaging, or your own private label. Suitable for resellers and distributors.
When genuine OEM seals are out of production for your old machinery, we can custom-make oil seals using your dimensions or our engineer-recommended specifications.
Ship under RuijueParts branding, neutral (unbranded) packaging, or your own private label. Suitable for resellers and distributors.
Volume pricing for repair shops, dealers, and fleet operators. Get a quote via our website or WhatsApp: +86 13692100161.
OEM seal kits are the right choice when machinery is under active warranty, operating at peak duty cycles, or when failure risk is unacceptably high. Budget aftermarket—like Ruijue Parts—makes sense in these common scenarios:
When a machine is aging out of your fleet, OEM parts cost more than the job warrants. A budget kit extends service life without over-investing.
For machines used infrequently or on lower-intensity tasks, premium OEM pricing may not be justified.
When OEM stock is out or delivery takes weeks, an available aftermarket kit gets your machine running now.
Repair shops and fleet managers running high volumes of machines often balance OEM and aftermarket across their portfolio based on criticality.
Fully retract the cylinder and relieve system pressure before disassembly. Never work on a pressurized circuit.
Remove from the machine. Unthread the gland nut and withdraw the piston rod carefully to avoid surface damage.
Clean the bore, rod, and all metal parts with a lint-free cloth. Contamination introduced during reassembly accelerates seal wear—this step is especially important for budget-grade seals.
Check for scoring or pitting. Budget seals are more sensitive to surface imperfections—address rod damage before fitting new seals.
Lightly coat each seal with clean hydraulic fluid before installation. Use proper seal drivers — not screwdrivers or sharp tools — to avoid nicking the sealing lip.
Torque the gland nut to spec and cycle the hydraulic system under no-load conditions. Inspect for leaks before returning the machine to service.
Budget-grade seals may have shorter service intervals than OEM. Inspect rod seals for moisture, oil film, or weeping more frequently and replace proactively.
Contaminated fluid degrades seals faster — this applies especially to non-OEM materials. Replace fluid and filters on schedule.
When storing equipment with cylinders extended, protect rod surfaces from corrosion and debris to preserve wiper seal life.
Avoid using sharp tools during assembly to prevent nicks or scores on the seal lips. Pre-lubricating all components with clean hydraulic oil is recommended to ensure a smooth fit into the cylinder grooves.
Click "Add to Cart" for immediate dispatch, or contact our team for bulk pricing and wholesale support.
First order was a pleasant surprise-
great value for money.
Good! The 101529-00005 seal kit
performed exceptionally. No oil leaks,smooth operation.
Fast delivery and exactly as described.Highly recommend!
Seals fit well and arrived on time.
Good quality for the price.
