A hydraulic breaker seal kit is a collection of specialized sealing elements used to keep hydraulic fluid contained and contaminants out. These seals sit in key areas of the cylinder body assembly, piston, and valve assembly, forming barriers under high pressure and temperature.
☑ Typical components include:
☑ U-cup seal: Creates a tight seal under high pressure around the piston.
☑ Buffer seal: Absorbs pressure spikes and protects the primary seal.
☑ O-rings: General sealing at fluid contact points.
☑ Dust seals: Prevent debris from entering moving parts.
☑ Back-up rings: Provide support to prevent seal deformation
Why Seals Matter: The Role of Each Seal in Your Breaker
● The U-cup seal surrounds the piston, keeping the hydraulic fluid where it belongs.
● The buffer seal cushions the piston stroke, preventing shock from reaching sensitive components.
● O-rings and back-up rings work as a second layer of protection, especially around the valve and front head.
● Dust seals block fine rock particles and prevent premature bushing and tool pin wear.
When any of these fail, the entire system is compromised.
Key Signs Your Hydraulic Breaker Seals Are Failing
1.Watch for these red flags:
2.Hydraulic fluid leaks around the front head or cylinder body
3.Reduced impact force despite stable oil flow
4.Unusual vibrations or noisy operation
5.Heat buildup near the cylinder
6.Frequent tool misalignment or stuck pistons
These signs typically indicate damaged piston seals, buffer seals, or warped O-rings.
Step-by-Step Guide: Replacing a Hydraulic Breaker Seal Kit
Replacing seals isn’t a guessing game. Here’s a general sequence:
1 Remove the hydraulic breaker from the carrier.
2 Drain residual hydraulic oil and disconnect supply lines.
3 Disassemble the cylinder body, piston, and front head.
4 Carefully remove old seals and clean all grooves.
5 Install new seals (lubricated) using plastic tools to avoid nicks.
6 Reassemble components in reverse order.
7 Test on low pressure before full operation.
About HMB
Yantai Jiwei is a leading manufacturer specializing in the research, development, and production of hydraulic breakers and related wear parts. With an unwavering commitment to quality, precision, and innovation, we are globally recognized for our durable and reliable hydraulic solutions.
We offer:
A full range of hydraulic breakers suitable for excavators from 0.8 to 120 tons
OEM-quality seal kits, bushings, pistons, and other spare parts
Strict quality control systems and international certifications
Technical support and after-sales service tailored to customer needs
For any inquiries, please feel free to contact HMB WHATSAPP: +8613255531097
Post time: Aug-27-2025
