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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.
5J8200-3K is an aftermarket U-cup rod seal kit reference used for selected Caterpillar hydraulic-cylinder applications. It is associated with the 5J-8200 base seal, a Type A urethane rod-seal profile measuring 2.00 in (50.80 mm) ID, 2.50 in (63.55 mm) OD and 0.41 in (10.49 mm) width. The “-3K” suffix is a supplier kit identifier, not a Caterpillar production part number. Kit contents may vary by manufacturer, so distributors and repair shops should confirm the supplied configuration before ordering or adding it to a cylinder overhaul list.
System: Hydraulic cylinder rod/gland sealing
Component role: Aftermarket U-cup rod-seal kit reference
Base seal reference: 5J-8200 Type A urethane U-cup rod seal
Function: Helps retain hydraulic oil around the moving rod in compatible cylinder gland designs
Selection guidance: Confirm kit contents against your supplier’s packing list and match the 5J-8200 base reference
Not for: A universal full-cylinder overhaul kit unless the listed contents match the cylinder repair requirement
Model
Reference applications for the 5J-8200 base seal include selected configurations of:
Excavators: 215, 215B, 215C, 215D, 219D, 225 and 245
Backhoe Loaders: 416, 416B, 416C, 426, 426B, 426C, 428, 428B, 428C, 436, 436B, 436C, 438, 438B, 438C, 446 and 446B
Track-Type Tractors: D3B, D3C, D4B, D4C, D4E, D4H, D5C, D5H, D5M, D5N and D6M
Wheel Loaders: 930, 930R, 930T, 950, 966C, 966D, 966E, 966F, 966F II, 966G, 966R, 970F and 972G
Motor Graders: 12G, 12H, 120H, 130G, 140G, 140H, 14G, 160G and 16G
Is 5J8200-3K a Caterpillar original part number?
No. 5J8200-3K is an aftermarket supplier reference. The related Caterpillar base reference is 5J-8200, a Type A U-cup rod seal.
Is 5J8200-3K the same as one 5J-8200 seal?
Not necessarily. 5J-8200 identifies the base rod seal, while 5J8200-3K is commonly sold as a kit reference. Confirm the actual contents and quantity in the supplied package.
Can this kit be selected by equipment model only?
No. The 5J-8200 base seal appears in multiple cylinder applications across older equipment families. Match the part number and cylinder group before ordering.
Can Ruijueparts quote 5J8200-3K by part number?
Yes. Send 5J8200-3K and your required quantity. We can check the reference against available kit data; for non-standard packaging, confirm the required contents before quotation.
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.
