367-3934 3673934 RING Buffer Seal Of 385C L MH 365C 385B 385C

1. Quick Details of  seal 367-3934:

2. 367-3934 picture:

3. Service part number :

 
4. FAQ

Q: What is the function of buffer ring/hby seal ?

A: A buffer ring (often designated as an HBY seal) serves as a primary protective shield for the main rod seal inside a hydraulic cylinder.

Located inside the cylinder head ahead of the main U-cup rod seal (closer to the fluid side), its primary job is to absorb extreme system stress before high-pressure hydraulic fluid reaches the primary seal.Here are the core Functions:

• Pressure Spike & Shock Absorption:When heavy equipment operates—such as a bulldozer blade impacting hard rock—hydraulic fluid undergoes sudden, intense pressure spikes. The buffer ring absorbs these shock loads, preventing peak pressure from blowing out or damaging the primary rod seal behind it.

• High-Temperature & Friction Protection

  Because it sits closest to the hot, pressurized hydraulic oil inside the cylinder, the buffer ring takes the brunt of thermal stress and friction. It is typically made from durable polyurethane (PU) paired with a polyacetal (POM) anti-extrusion back-up ring to withstand heat and severe extrusion forces.

Q: Could this piston rod seal be universally installed on hydraulic cylinders of other engineering machinery?
A: It is specially designed for excavator arm cylinders. It cannot be applied to bulldozer tilt cylinders or wheel loader steering cylinders of different sizes.

Q: What construction working conditions suit this hydraulic piston rod seal?
A: It performs steadily in mountain excavation and foundation engineering sites, coping with frequent arm stretching movements and muddy environment erosion.

Q: How is the high-low temperature resistance of this sealing assembly?
A: It maintains reliable sealing performance from -76°C to 372°C and works continuously under long-time heavy load excavation operations.

Q: What key points should technicians notice during installation?
A: Avoid scratching the sealing lip with sharp edges during mounting. Tiny scratches will cause oil leakage and shorten service life significantly.

Q: What practical efficiency benefits can on-site excavator maintenance staff gain from using this fully pre-matched rod seal kit?
A: All supporting sealing accessories required for rod overhaul are pre-assembled into one complete set without separate procurement. Technicians do not need to carry scattered loose seals or repeatedly measure rod groove dimensions on site, greatly shortening cylinder repair time.

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