303CR Excavator hydraulic Arm Cylinder NOK Oil Seal Service Kit

A. In order to give you fast and accurate pricing information, we need some details about the machine engine/appliion and the part number of the part you want. And, size and pictures will be better if you are not sure about it. We can check and help you with it.

B. If you can not find the parts you want here, please contact us for an inquiry. Thank you.

Parts List:

Seal: NOK
Piston seal: ODI,OSI,SPG,SPGW,SPGO,SPGC,SPGI.
Dust seal: DKI,DWI,DWIR,DKBI,DKB,DKH,DSI.
Rod seal: IDI,ISI,IUH,UNI,SPNO,SPN,SPNC.
Piston Seal & Rod Seal: UPH,USH,USHR.
Buffer seal: HBY,HBTS.
Wearing ring: RYT,WR.
Pollution prevention seal: KZT Back-up ring
Supporting ring: BRT2, BRT3.
O Ring: Material: NBR, VMQ, FKM.
Others: ROI.
Skeleton oil seal: TC,TB,VC,VB,TCV,TCN.

All Kinds of seal kit as following:

1. Boom cylinder seal kit
2. Arm cylinder seal kit
3. Bucket cylinder seal kit
4. Center Joint seal kit
5. Control Valve seal kit
6. Hydraulic pump seal kit
7. Travel Motor seal kit
8. Swing Motor seal kit
9. Gear Pump seal kit
10. Track adjust cylinder seal kit
11. Servo valve seal kit
12. Pilot valve seal kit

Hydraulic Breakers Oil Seal Rock Hammer Seal kit

Your Trusted Excavator Parts Supplier – Manufacturer & One-Stop Sourcing Solution

Looking for a reliable supplier of excavator parts? Whether you need OEM services or a complete range of parts, we provide the best solutions for your business. As both a manufacturer and trading company, we combine factory-direct prices with the convenience of one-stop sourcing, ensuring that you get high-quality parts at competitive prices.

At YNF Machinery, we specialize in excavator rubber parts and a wide range of excavator components. Our extensive experience and commitment to quality make us a trusted partner for distributors, wholesalers, and repair shops worldwide.

Why Choose YNF Machinery?

We are not just another supplier—we are your long-term partner for excavator parts. Here’s why businesses worldwide choose us:

✅ Largest Excavator Rubber Parts Factory in Southern China

Our factory is the biggest excavator rubber parts manufacturer in southern China. This means:
✔ Lower production costs, allowing you to increase your profit margins
✔ Reliable and stable supply, ensuring you get the parts you need, when you need them
✔ Consistent quality control, reducing the risk of defective products

✅ Thousands of Products & Multiple Quality Levels

We offer a comprehensive range of excavator parts, covering various brands and models.
✔ Choose from thousands of product lines
✔ Select from different quality levels to suit your market demands
✔ Always find the right part, reducing time spent searching for suppliers

✅ Expanding Global Network – 16+ Agents in China & Growing

We have over 16 agents across China and are actively expanding our global presence.
✔ Looking for distributors and agents worldwide—let’s grow together!
✔ Support with marketing, logistics, and product knowledge
✔ Long-term partnership opportunities with exclusive benefits

✅ 30+ Years of Industry Expertise

With decades of experience, we understand the excavator parts market inside out.
✔ Established reputation for reliability and professionalism
✔ Knowledgeable team to help you find the right parts quickly
✔ Expertise in OEM manufacturing, making custom parts to your specifications

✅ OEM Services & Customization

Looking to develop your own brand or need custom parts? We’ve got you covered!
✔ Our own factory can manufacture parts based on your designs and specifications
✔ We provide custom branding options to help you build your business
✔ From rubber parts to metal components, we can customize everything you need

✅ Office & Showroom in Guangzhou – Convenient Logistics

Our Guangzhou office and showroom allow for easy business meetings and fast shipping.
✔ View and inspect products before ordering
✔ Quick access to major ports for efficient global shipping
✔ Dedicated customer support team to assist with orders and inquiries

What Excavator Parts Do We Offer?

We cover all major excavator brands, including Caterpillar, Komatsu, Hitachi, Volvo, Kobelco, Doosan, Hyundai, JCB, Kubota, and more. Our product range is designed to keep your machines running efficiently and reduce downtime.