Parameters / Specifications

Kit contents may vary slightly depending on breaker serial number. Confirm with our team if unsure.

Product Technology

This SB81 seal kit is manufactured using advanced molding and CNC machining techniques. Polyurethane seals are injection-molded and post-cured to achieve the target hardness and dimensional accuracy. NBR O-rings are compression-molded from high-quality rubber compounds with excellent oil resistance. PTFE backup rings are machined from premium-grade polymer for high strength and low creep. Each seal is individually inspected for dimensional conformity and surface quality before packaging.

Product Working Principle

The seals in a hydraulic breaker perform several critical functions. Piston seals prevent hydraulic oil from bypassing the piston inside the cylinder, ensuring maximum impact energy is transferred to the chisel. Accumulator diaphragms maintain the nitrogen charge, providing the gas-fired assist that boosts impact power. O-rings and backup rings seal static joints between valve plates, cylinder sections, and end caps, preventing external leaks. Wiper seals keep dirt and debris out of the working area, protecting internal components from contamination. Together, these seals maintain system pressure, minimize oil consumption, and extend the service life of the entire breaker.

Company Service

• Global Shipping: Fast, insured delivery via sea, air, or express courier to any job site or warehouse worldwide.

• OEM & Custom Orders: Custom seal configurations available for modified breakers or special working conditions.

• 24/7 Technical Support: Installation guidance and troubleshooting via phone, email, or video call.

• Complete Parts Inventory: Seal kits, chisels, pistons, and bushings stocked for immediate dispatch.

• 12-Month Warranty: Every seal kit is covered against manufacturing defects.

• Bulk Discounts: Special pricing for repair shops, distributors, and fleet owners ordering multiple kits.

Manufacturing Process (Production Workflow)

1. Material Selection: High-grade polyurethane, NBR, and PTFE raw materials sourced from certified suppliers.

2. Mold Design & Fabrication: Precision molds made to match OEM SB81 seal dimensions exactly.

3. Injection/Compression Molding: Seals are molded under controlled temperature and pressure to achieve the target hardness and elasticity.

4. Post-Curing: Polyurethane seals are post-cured to stabilize dimensions and improve mechanical properties.

5. Machining (PTFE Parts): PTFE backup rings are CNC-machined to precise dimensions.

6. Inspection: Each seal is checked for dimensional accuracy, surface finish, and material hardness.

7. Kit Assembly: Seals are packaged as a complete kit with labeling and installation instructions.

8. Packaging: Kits are packed in moisture-resistant bags inside a sturdy cardboard box for shipping.

FAQ – SB81 Hydraulic Breaker Seal Kit

Q1: Will this seal kit fit my SB81 breaker exactly?
Yes. This kit is precision-molded to match the original SB81 seal dimensions. However, if your breaker has been modified or is an early production model, please confirm the serial number with our team before ordering to ensure compatibility.

Q2: What is included in the kit?
The kit typically includes all O-rings, U-cup piston seals, backup rings, wiper seals, accumulator diaphragm, and valve seals needed for a complete rebuild. A detailed parts list is included in the package.

Q3: How often should I replace the seals in my SB81 breaker?
Under normal operating conditions, seals should be replaced every 1,500–2,000 working hours or whenever you notice hydraulic oil leakage, reduced impact power, or nitrogen pressure loss. Regular inspection will help determine the right interval.

Q4: Can I install this seal kit myself?
Yes, installation is possible for experienced mechanics with the proper tools. The kit includes installation instructions. If you are unfamiliar with breaker disassembly, we recommend having a professional technician perform the rebuild. Video call support is available 24/7.

Q5: What causes premature seal failure?
Contaminated hydraulic oil, overheating, excessive operating pressure, and using the wrong type of hydraulic oil can all shorten seal life. Always maintain clean oil and correct operating parameters to maximize seal longevity.

Q6: Is this an OEM seal kit?
This is a high-quality aftermarket seal kit manufactured to OEM specifications. It is not a genuine OEM part, but it matches OEM fit and performance at a significantly lower price. Many repair shops and fleet owners choose our kit for reliability and value.