The 4C4782 O-Ring Box is a comprehensive replacement O-ring seal kit designed for Caterpillar heavy equipment. This kit contains 580 pieces of nitrile rubber O-rings in 32 popular sizes used on Caterpillar® equipment. It serves as a direct replacement for OEM part number 4C4782, providing everything needed for hydraulic system repairs, engine maintenance, and general sealing applications on CAT machinery. SANPING SEAL – Engineering Machinery High-End Seals – 17 Years Export Expertise Product Overview The 4C4782 O-Ring Box is an essential maintenance kit for anyone operating or servicing Caterpillar equipment. Instead of searching for individual O-rings when a leak occurs, this comprehensive assortment box puts the most commonly needed sizes at your fingertips. The kit is designed for use across a wide range of CAT machinery, including excavators, loaders, bulldozers, backhoes, compactors, and agricultural equipment. This replacement kit is compatible with OEM part number 4C4782, offering the same functionality as genuine CAT kits at a more competitive price point. Specifications and Parameters： Minimum order: 20 boxes

Parameter	Detail
Product Code	4C4782
Compatible Brand	Caterpillar (CAT)
Total Pieces	580 pieces
Number of Sizes	32 sizes
Material	NBR (Nitrile Butadiene Rubber) / Buna-N
Hardness	70-90 Shore A
Temperature Range	-40°C to +120°C
Color	Black、Red
Storage Box	Durable plastic organizer case
Minimum Order Quantity	Contact for MOQ

Kit Contents：The 4C4782 O-Ring Box contains the following 32 sizes with exact quantities:

No.	Part Number	Quantity	No.	Part Number	Quantity
1	4J0527	10 pcs	17	4J5140	20 pcs
2	4J7533	20 pcs	18	3D2824	20 pcs
3	7J0204	20 pcs	19	2S4087	20 pcs
4	3J7354	20 pcs	20	4J0524	15 pcs
5	1J9671	20 pcs	21	6V9746	20 pcs
6	3J1907	20 pcs	22	5K9090	20 pcs
7	4K1388	20 pcs	23	6V8400	20 pcs
8	4J0526	10 pcs	24	8T0315	20 pcs
9	4J0522	15 pcs	25	6K6307	20 pcs
10	4J0520	15 pcs	26	4J0523	15 pcs
11	4J5267	20 pcs	27	4J5477	20 pcs
12	2M9780	20 pcs	28	6V8397	20 pcs
13	7M8485	20 pcs	29	6V8398	20 pcs
14	4J0525	10 pcs	30	7J9108	20 pcs
15	4J0521	15 pcs	31	3K0360	20 pcs
16	4J0519	15 pcs	32	304606	20 pcs

Total: 580 pieces Product Features 1. Comprehensive Assortment With 580 pieces covering 32 popular CAT O-ring sizes, this kit handles the majority of sealing needs encountered during routine equipment maintenance and repair. 2. Premium NBR Material All O-rings are manufactured from high-quality NBR (Nitrile) rubber, also known as Buna-N. This material offers excellent resistance to mineral oils, diesel fuel, hydraulic fluids, and provides good abrasion resistance. 3. Direct OEM Replacement This kit serves as a direct replacement for Caterpillar part number 4C4782, ensuring compatibility with original equipment specifications. 4. Convenient Storage Box The O-rings come organized in a durable plastic storage box with labeled compartments, making it easy to find the right size when needed and keeping the kit clean and portable. 5. Wide Application Range The included sizes are specifically selected for Caterpillar equipment, covering engine seals, hydraulic fitting O-rings, fuel system seals, and cooling system applications. 6. Time-Saving Convenience Having a complete assortment of O-rings on hand eliminates the need to measure and order individual seals for each repair, reducing downtime and improving maintenance efficiency. Applications The 4C4782 O-Ring Box is compatible with a wide range of Caterpillar equipment types: Construction Equipment: Excavators Backhoe loaders Bulldozers Wheel loaders Skid steer loaders Motor graders Agricultural Equipment: Tractors Combines Cotton pickers Bale wagons Heavy Machinery: Articulated dump trucks Compactors and asphalt rollers Cranes Pavers Specific System Applications: Diesel engines (C-Series and industrial engines) Hydraulic systems (cylinders, pumps, valves) Fuel systems Cooling systems SAE O-ring face seal (ORFS) fittings Hydraulic hose connections Why Choose SANPING SEAL? 17 Years of Export Expertise Guangzhou Sanping Machinery Co., Ltd., established in 2009, has served customers across South Asia, Southeast Asia, Africa, South America, the Middle East, and Europe. Specialized Focus We concentrate exclusively on engineering machinery high-end seals, ensuring we understand your equipment applications better than general seal suppliers. Quality Guarantee Every order follows our two-step quality process: pre-production sample testing before mass production, and final inspection before shipment. Responsive Support Our sales team responds to inquiries within 24 hours. Our technical team provides application guidance and seal selection support. Our logistics team ensures smooth shipment documentation and delivery. Frequently Asked Questions (FAQ) Q: What is the total piece count in the 4C4782 O-Ring Box? A: The kit contains 580 pieces of nitrile rubber O-rings covering 32 different sizes. Q: Is this an OEM Caterpillar product? A: This is a high-quality aftermarket replacement kit, not an OEM product. It is designed to meet OEM specifications and serves as a direct replacement for CAT part number 4C4782. Q: What material are the O-rings made of? A: The O-rings are manufactured from NBR (Nitrile/Buna-N) rubber, which provides excellent resistance to oils, fuels, and hydraulic fluids. Q: What equipment is this kit compatible with? A: The kit is compatible with a wide range of Caterpillar equipment including excavators, backhoes, bulldozers, loaders, tractors, compactors, and more. Q: What is the temperature range for these O-rings? A: NBR O-rings are suitable for temperatures from -40°C to +120°C. Q: What is the hardness rating? A: The O-rings typically have a hardness of 70-90 Shore A, suitable for most hydraulic and engine sealing applications. Q: Do you accept custom orders? A: Yes, we accept custom orders for non-standard sizes or kit configurations. Please provide your specifications and required quantities. Q: What payment methods do you accept? A: We accept T/T (bank transfer), L/C, MoneyGram, Western Union, and cash.