367-3932 3673932 139 mm inner diameter buffer seal of 385C L 374F L 374D L

1. Quick Details of  seal 367-3932:

2. 367-3932 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.

• Pressure Relief (Over-Pressure Prevention)

  An HBY-type buffer seal features specialized lip geometry or built-in relief slots/channels. If high-pressure fluid gets trapped between the buffer ring and the main rod seal, the buffer ring's dynamic lip flexes back to allow the fluid to flow back into the system, preventing dangerous inter-seal pressure buildup.

Q: Can this piston rod seal fit hydraulic cylinders of all construction machinery?
A: It is specially manufactured for excavator bucket cylinders. It cannot be mounted on wheel loader steering cylinders or bulldozer tilt cylinders of different dimensions.

Q: What construction working scenarios suit this hydraulic piston rod seal?
A: It applies to quarry excavation and soil loading sites, coping with frequent bucket grabbing and dumping movements and sediment erosion.

Q: How about high and low temperature adaptability of this sealing assembly?
A: It maintains stable sealing performance within -77°C to 371°C and works reliably under long-term cyclic loading operations.

Q: What installation tips should operators follow during replacement?
A: Clean all impurities inside the cylinder thoroughly. Tiny particles will scratch the sealing lip and shorten service life rapidly.

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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