Boom Arm Bucket Hydraulic Cylinder Seal Kits for Caterpillar CAT Excavator
High-quality Caterpillar Excavator Hydraulic Seal Kit engineered for superior leak prevention, precise cylinder fit, and long-lasting durability, ensuring reliable hydraulic performance under heavy-duty construction conditions.
| Material | NBR/PTFE/ACM/VMQ/FKM/HNBR/EPDM/Silicone and etc |
|---|---|
| Working Temperature | -40–120℃(according to the material) |
| Pressure | Up to 690bar(10000psi) |
| Color | Black/Orange/Brown/White/Brown |
| MOQ | 5 Pieces |
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Kinton Seals is trusted by professionals worldwide for providing high-quality seal kits for excavators, dozers, loaders, and other heavy machinery, ensuring reliable performance and long-lasting durability.
The Caterpillar Excavator Hydraulic Seal Kit is designed to maintain optimal hydraulic system performance, preventing fluid leakage and ensuring smooth cylinder operation. By protecting pistons and rods from contamination and wear, this seal kit helps maintain consistent lifting and digging power across various working conditions.
Hydraulic seals are critical components that control fluid flow and pressure, directly affecting the efficiency and lifespan of your excavator's hydraulic system. This kit provides all essential seals for boom, arm, and bucket cylinders, allowing for a complete rebuild and enhanced reliability.
Materials & Manufacturing
Each seal in the kit is made from high-quality, abrasion-resistant materials selected for Caterpillar specifications. The combination of NBR (Nitrile Butadiene Rubber), polyurethane, and high-grade elastomers ensures excellent resistance to:
- High-pressure hydraulic fluids
- Extreme temperatures
- Wear and abrasion from continuous operation
Advanced molding and finishing processes guarantee precise dimensions and tight tolerances, providing a perfect fit for each cylinder component.
Manufacturing Process Summary
Every Caterpillar excavator seal kit is produced through a strict manufacturing process:
Precision Material Weighing
Each raw material block is carefully weighed with high-accuracy equipment before processing. This ensures that every seal ring starts with the exact material volume required for its specific size and application, preventing inconsistencies in density or performance.
Mold Preparation & Material Placement
After weighing, the prepared material is positioned onto the appropriate mold. Our workshop is equipped with a wide variety of molds to match different seal ring diameters and cross-sections. The correct mold selection guarantees precise shaping, while careful placement avoids defects such as uneven thickness.
High-Pressure Compression Molding
The molds are then set under specialized compression machines, where controlled pressure and temperature are applied. This process allows the material to be fully formed into a durable seal with consistent hardness and elasticity. Strict monitoring ensures every batch meets dimensional accuracy and structural integrity.
Rigorous Quality Inspection
Each batch of seals undergoes rigorous testing after molding. Technicians check for dimensional accuracy, surface smoothness, hardness, and sealing resilience. Any defective products are filtered out, ensuring that only seals with stable performance and long service life proceed to packaging.
OEM Compatibility & Fitment
This hydraulic seal kit is compatible with a wide range of Caterpillar excavators, including but not limited to:
- CAT 320, 320D, 325, 330, 336 series
- Boom, arm, and bucket cylinder rebuilds
- OEM replacement numbers: Contact us with your existing part numbers for confirmation
The kit is designed for direct replacement and offers the same reliability as original Caterpillar components, ensuring minimal downtime.
| Part Numbers | ||||||||
|---|---|---|---|---|---|---|---|---|
| 3E3292 | 3E3303 | 4I3665 | 4I3668 | 4I7664 | 4I8914 | 7Y5145 | 8U5852 | 9X6261 |
| 9X6263 | 2332626 | 2605320 | 5456415 | 0875394 | 1052601 | 1057359 | 1057397 | 1148290 |
| 1163612 | 1184131 | 1184175 | 1186023 | 1195446 | 1195457 | 1261880 | 1261937 | 1261947 |
| 1270630 | 1336823 | 1373764 | 1540744 | 1589092 | 1680758 | 1697837 | 1697838 | 1709941 |
| 1709999 | 1764914 | 1799634 | 1799772 | 1855574 | 1884457 | 1915619 | 2043692 | 2095874 |
| 2159985 | 2159986 | 2316845 | 2330764 | 2344587 | 2366368 | 2366389 | 2460658 | 2470257 |
| 2478790 | 2478868 | 2478878 | 2478888 | 2478998 | 2479001 | 2481165 | 2501047 | 2502475 |
| 2521191 | 2590633 | 2590775 | 2836179 | 2897716 | 2897733 | 3500970 | 3500973 | 3500974 |
| 3904227 | 3937887 | 3937949 | 3979091 | 3979294 | 3980963 | 3982332 | 4560197 | 4560203 |
| 4560204 | 4560205 | 4560207 | 4610642 | 4610643 | 4642931 | 5185133 | 5185136 | 1M1574 |
| CAT 303.5 CR Arm cylinder seal kit | CAT 320DL Bucket cylinder seal kit | CAT 320DL Boom cylinder seal kit | ||||||
| 2S5867 | 4J3342 | 5J5402 | 5J8150 | 5J8275 | 5J8300 | 7X2670 | 7X2672 | 7X2749 |
| 7X2751 | 7X2762 | 7X2764 | 7X2767 | 7X2784 | 7X2789 | 7X2791 | 7X2825 | 8C9122 |
| 8C9124 | 1672207 | 2253281 | 2253283 | 2268202 | 2299382 | 2892937 | 2892946 | 2892948 |
| 7Y4222 | 7Y4295 | 7Y4970 | 7Y5147 | 81E1-3204 | 81E1-3301 | 91ER-20051 | 2274-6014 | 2478974 |
| 401107-00242A | A7V0250 | A8V55 | 2274-1014 | KVC925 | PVD2B-36L | |||
If you can't find the serial number you need, please contact us.
Quality Control & Testing
Each kit is subjected to rigorous testing to ensure:
- Leak-proof performance under high-pressure conditions
- Long-term resistance to wear and hydraulic fluid exposure
- Accurate fit to reduce installation errors and prevent cylinder damage
Our quality control measures guarantee that every kit meets or exceeds OEM performance standards.
Caterpillar-Specific Performance Benefits
Caterpillar excavators are known for their demanding workloads and long duty cycles, which place extra stress on hydraulic components. Our Caterpillar-specific seal kits are designed with these challenges in mind. The sealing materials are carefully selected to withstand high hydraulic pressure and extreme temperature variations, ensuring consistent performance in mining, construction, and heavy earthmoving operations. In addition, the kits are engineered to perfectly match CAT cylinder dimensions, minimizing installation time and reducing the risk of leakage. By using our seal kits, CAT users can expect extended service intervals, improved equipment uptime, and lower overall maintenance costs.
Material Overview for Seal Kits
Each seal kit is composed of selected elastomers and polymers, chosen for their performance under different working environments:
NITRILE RUBBER BUNA(NBR, BUNA-N)
Temperature Range:-30 to 125 ℃
Hardness:60-90 Shore A
Color: Black
Use: Oil & Water Resistance Situation Advantage: Excellent oil resistance, performance and stability, widely used, cheaper
FLUORORUBBER(FKM,FPM)
Temperature Range:-20 to 250℃
Hardness:70-90 Shore A
Color: Black/Brown/Green
Use: Oil & Chemical Resistance Situation
Advantage: Wear resistance, acid and alkali resistance, high temperature resistance situation
SILICONE (VMQ )
Temperature Range: -60 to 225 ℃
Hardness: 50-70 Shore A
Color: Red/Black/Blue/White/Transparent, etc
Use: Heat& Food Situation(FDA, RoHS Approved)
Advantage: Good heat resistance, cold resistance, lubrication oil resistance, water resistance safety & reliable to human body
ETHYLENE PROPYLENE RUBBER(EPDM, EPM)
Temperature Range:-50 to 150 ℃
Hardness: 60-90 Shore A
Color: Black
Use: Ozone, water vapor situation
Advantage: Excellent oxidation resistance ozone resistance and erosion resistance
PERFLUOROELASTOMER(FFKM, FFPM)
Temperature Range: -42 to 327 ℃
Hardness:60-95 Shore A
Color: Black / White
Advantage: Long-term, proven performance, can mean less frequent seal changes, repairs and inspections, increasing process and equipment uptime in productivity and yield.
NITRILE RUBBER BUNA(NBR, BUNA-N)
Temperature Range:-30 to 125 ℃
Hardness:60-90 Shore A
Color: Black
Use: Oil & Water Resistance Situation Advantage: Excellent oil resistance, performance and stability, widely used, cheaper
Each material is carefully chosen to match excavator’s working conditions, ensuring seals withstand hydraulic oil, temperature fluctuations, and continuous pressure.
Maintenance Recommendations
To maximize the lifespan of your hydraulic cylinders:
- Inspect seals regularly for signs of wear or leakage
- Replace seals promptly during cylinder maintenance
- Use recommended hydraulic fluids and maintain proper system pressure
- Keep cylinders clean to prevent contamination
At Kinton Seals, we understand that reliable delivery is just as important as product quality. Our goal is to ensure that every order of Seal Kits for excavators, bulldozers, wheel loaders, and other heavy machinery reaches our customers safely, on time, and in perfect condition.
Packaging & Protection
- Standard Export Packaging – Each seal kit is carefully packed in moisture-proof and dust-proof bags, ensuring seals remain clean and undamaged during storage and transportation.
- Layered Protection – Kits are placed in sturdy cartons, and for bulk shipments, cartons are further reinforced with pallets and stretch film to minimize impact during handling and transit.
- Customization Options – We provide OEM/ODM packaging services, including branded boxes, barcodes, and special instructions, helping partners strengthen their brand presence in local markets.
- Extra Protection – For bulk shipments, cartons and pallets are reinforced to reduce the risk of damage in transit.
Order Processing & Lead Time
- Standard Seal Kits – For large quantity orders, lead time is usually 7–10 working days, as each kit requires precise matching of every seal, followed by labeling and packaging.
- Custom Seal Kits – For tailored requirements or non-standard models, production and assembly typically take 15–30 days, especially if new tooling or mold development is required.
- Sample Orders – Small batch or sample kits can often be prepared faster, subject to stock availability.
Delivery Options
- Air Freight for urgent orders
- Sea Freight for bulk shipments
- Courier Express (DHL, FedEx, UPS) for small packages and samples
Quick Quote Request
Kinton Seals is trusted by professionals worldwide for providing high-quality seal kits for excavators, dozers, loaders, and other heavy machinery, ensuring reliable performance and long-lasting durability.
