Oil Resistance Hitachi Hydraulic Ram Repair Kits EX400-1 450-5 Hydraulic Cylinder Seal Kit

Product Description:

The EX400-1 / 450-5 hydraulic cylinder sealing kit is used to seal up the gap between different parts of the hydraulic cylinder. They can be used under high pressure and also can be used between the head and the connecting rod when the rod and cylinder seal are reciproing. We usually call them as BOOM / ARM / BUCKET cylinder seal kit.

Key Features:

· Exceptional Oil Resistance: Ideal for use with various hydraulic oils, ensuring long-lasting sealing performance.
· High-Temperature Endurance: Operates effectively within a temperature range of -30°C to +120°C.
· Excellent Elasticity & Sealing: Provides superior leak prevention and maintains cylinder efficiency.
· Premium Materials: Constructed with high-grade TPU, NY, NBR, and PTFE compounds for wear and heat resistance.
· Wide Compatibility: Specifically designed for the boom, arm, and bucket cylinders of EX400-1 and EX450-5 excavators.

Included Seal Elements:

· Piston U-Seal
· Piston Buffer Ring
· Piston Seal
· Wear Ring
· Dust Ring
· O-Ring
· Backup Ring
· U-Seal Backup

Common Piston Seal Types Available:
SPGW, SPGO, SPGT, SPGA, SPG, TPM, OHM, KDAS, ODI, OKH, DAS, STEP Seal

Technical Specifications:

· Application: Hydraulic cylinder repair for excavators including EX400-1 and EX450-5
· Seals Material: TPU, NY, NBR, PTFE
· Operating Temperature: -30°C to +120°C
· Origin: Materials and manufacturing from CHINA / JAPAN / USA
· Packaging: Sealed inner PP bag + outer carton box
· Lead Time: 7‒15 days after payment confirmation

Ideal Use Case:
This kit is suited for professional repair services and DIY maintenance of excavator hydraulic cylinders, providing all essential sealing components in one package. It helps restore cylinder functionality with high-quality, oil-resistant seals capable of withstanding demanding working conditions.

Excavator Hydraulic Seal Kit Element Components

Related Excavator Number:

EX60-1EX60-2 /3EX60-5 / 60LC-5 / 70-5EX100-1EX100-2 / 100-3 / 100-5EX120-1EX120-2 / 120-3EX120-5EX200-1EX200-3 / 200-5EX210-5 / 225-5EX220-1EX220-3 / 220-5 / 230-5EX270EX270-5EX300-1 / 300-2 / 300-3EX300-5 / 350-5 / 350 / 360-5EX400-1 / 450-5EX470EX600-5

Company Profile: 

Mido Oil Seal was founded in 2007, which is a company specializing in the sale of construction machinery oil seals. Gathering oil seals from world's famous factories, with currently over 1,000 varieties in stock. The main service is construction machinery and engineering machinery.

The company has a total of three store and a warehouse now, one of which serves as the Foreign Trade Department to customer reception and product display. The most important thing is that we have a professional team for purchasing, selling, packing, shipping and after-sale service.

Our CEO Mr. Hu has been engaged in the oil seal industry since 1995. As one of the founders, he founded the Guangzhou Construction Machinery Industry Association and served as its president.

According to the actual situation of the Chinese excavator maintenance market, he has continuously studied, researched, innovated, introduced and developed high-quality oil seal repair kits that meet the real needs of the market. Ensure that customers can buy High-performance anti-leakage effect and long-term oil sealing effect. Based on technology leadership, the company has established a market research, quality assurance and after-sales service system to fully meet customers exact needs and has won excellent results in the industry. The reputation and word of mouth have won the continuous support of domestic and international counterparts and customers. Through long-term first-line services, we know that the promotion and use of high-quality oil seals are inseparable from your support and encouragement. We always adhere to the principle of quality first and benefit sharing to provide high-quality oil seals for the customers.

In addition to online sales, we also participate in exhibitions to have better face-to-face contact with customers. 

The history of exhibition

2001 Beijing BICIS

2004 Shanghai Bauma

2005 Beijing BICIS

2006 Shanghai Bauma

2007 Beijing BICIS

2009 Beijing BICIS

2011 Beijing BICIS

2013 Beijing BICIS

2024 Moscow CTT

2024 Shanghai Bauma

​​​​​​​​​