Product Overview

This high-performance Boom Cylinder Seal Kit (Part Number: 4654421) is engineered for professional-grade hydraulic system maintenance on excavators. Designed to restore factory-level sealing integrity, this kit is essential for preventing fluid leaks, maintaining hydraulic pressure, and ensuring optimal boom operation. We supply this critical component to a global network of heavy equipment distributors, repair shops, and construction companies, with major markets including North America, Europe, the Asia-Pacific region, and the Middle East.

Key Features & Benefits

• Premium Material Construction: Manufactured from high-grade nitrile rubber (NBR) and polyurethane compounds for exceptional resistance to hydraulic oil, abrasion, and pressure spikes.
• Precision Engineering: Components are precision-machined to exact OEM specifications, ensuring a perfect fit and reliable performance in demanding conditions.
• Complete Seal Solution: Contains all necessary seals, O-rings, and backup rings required for a comprehensive cylinder overhaul, saving time on sourcing individual parts.
• Enhanced Durability: Extends the service life of your excavator’s boom cylinder by preventing contamination ingress and fluid loss, reducing downtime and total cost of ownership.
• Performance Restoration: Effectively eliminates cylinder drift and restores full hydraulic power and control to the boom function for safe, efficient operation.

Technical Specifications

OEM Cross-Reference

This seal kit is a direct replacement for the OEM part number 4654421. It is engineered to be interchangeable with seal kits used in various excavator models from major manufacturers. Always verify compatibility with your specific cylinder model and serial number.

Compatibility

This Boom Cylinder Seal Kit (4654421) is designed for compatibility with a range of mid-to-large size excavators. It is commonly required for boom cylinder repairs on models from leading brands such as Caterpillar, Komatsu, Hitachi, Volvo, and Doosan. Specific application should be confirmed by matching the part number from the original cylinder or the machine’s service manual.

Global Supply & Distribution

We are a trusted global supplier for heavy equipment parts, facilitating seamless international trade. Our logistics network ensures reliable shipping to key industrial hubs and ports worldwide.

• Worldwide Shipping: We export via air and sea freight to all major continents.
• Key Markets Served: Direct supply to distributors in the USA, Canada, Germany, UK, Australia, Japan, UAE, and South Africa.
• Fast Delivery: Stock availability for prompt shipment to major ports like Los Angeles, Rotterdam, Singapore, and Dubai.
• Export Compliance: All shipments are prepared with complete commercial invoices, packing lists, and comply with international customs regulations for a smooth clearance process.

Quality Assurance

Every seal kit undergoes rigorous quality control to meet the high standards demanded by the heavy equipment industry.

• Manufacturing Standards: Produced in ISO 9001-certified facilities using advanced molding and machining processes.
• Material Certification: Raw materials are sourced from reputable suppliers and tested for chemical and physical properties.
• Dimensional Inspection: Critical components are 100% measured to verify conformity with original specifications.
• Performance Warranty: Backed by a standard warranty against manufacturing defects, ensuring customer confidence.

FAQ

Q1: How do I confirm this seal kit fits my excavator’s boom cylinder?
A1: The surest method is to match the part number. Locate the identification tag or stamped number on your existing boom cylinder or refer to your machine’s official parts catalog. This kit replaces part number 4654421. If unsure, provide your excavator model and serial number to our technical team for verification.

Q2: What tools and expertise are required for installation?
A2: Installing a boom cylinder seal kit requires significant mechanical expertise. The process involves safely depressurizing the hydraulic system, disassembling the cylinder, removing old seals, cleaning all components meticulously, and installing new seals with proper lubrication. Specialized tools like seal drivers, ring expanders, and a clean workspace are essential to prevent damage. We recommend the procedure be performed by a certified heavy equipment mechanic.

Q3: What are the signs that my boom cylinder needs this seal kit?
A3: Common symptoms include visible hydraulic oil leakage from the cylinder rod, “drift” or slow retraction/extension of the boom when not in use, reduced lifting power, and hydraulic fluid contamination. Addressing these issues promptly with a seal kit prevents more extensive damage to the cylinder barrel, rod, and the entire hydraulic system.

Our advantages

1.An authorized wholesaler of Isuzu genuine parts, Hino genuine parts, Mitsubishi genuine parts and Mahle parts.

2. We are not only supply genuine parts, but also high quality OEM parts, which are made in China or made in Japan.

3. More than 10 years of experience in machinery parts, professional supply of diesel engine parts.

4. Fast delivery, the fastest can be shipped in one day ,more than 500,000 of different types parts in stock.

5. Scientific ERP system, easy and fast to locate the parts that customer needs.

6. Professional technician checks the parts before delivery, to make sure the parts are correct, usable and defect-free.

Exhibition

Packing&Shipping

1.  Our shipment is by air/sea/express (DHL/FEDEX/TNT/UPS/EMS).

2.  Once we get confirmation of payment, we will ship products in 2 days.

3.  Our packaging is standard export wooden box or others as your requirement.

4. We’ll check and test the products before shipping , and givethe pictures to our customers to confirm.

FAQ

Q1. What is your company major products?

A: Our main products are Liner kit, Piston, Rings, Liner, Gasket kit, Bearing, Injection pump, Nozzle, Water pump, Oil pump,Crankshaft, Turbocharger,Filter, etc.

Q2.What is the MOQ?

A: Normally we can supply any quantity if we have in stock.

Q3. What is your payment term ?

A: We accept Western Union, T/T, Paypal.

Q4. What is the packing ?

A: Carton or wooden case , If you want to put your logo on the packing , We will do it after get your authorization letter.

Q5. When can you deliver products after payment ?

A: By Express ,usually might take 3-4 days ;By Air , Usually take 7-9 days ; By Sea ,usually take 1-2 months .

Q6. What can you do to complete order perfectly ?

A: In the beginning , We will communicate with clients in details to understand what they need .

Before packing , We will check the products and send photos to clients .After confirmation ,

We will packing products well to avoid damage . Once we get tracking number ,

We will send it to customer and keep contact in with clients .