Core Purpose & Equipment Compatibility
This catalog features high-performance repair components exclusively engineered for the JJ Series Telescoping Cylinder, widely applied in construction machinery, mining equipment, and heavy-duty material handling systems. Tailored to construction fleet managers, hydraulic maintenance technicians, and industrial equipment service providers, the kit addresses the core demand of resolving sealing and positioning failures caused by frequent telescopic movement, high hydraulic pressure, and harsh working environments (dust, vibration, temperature fluctuations). Its primary purpose is to restore cylinder sealing integrity, ensure smooth telescopic operation, minimize unplanned downtime, and extend the service life of JJ Series telescoping cylinders.
1. O-Ring Components
O-rings are critical sealing elements for JJ Series telescoping cylinder joints, piston rods, and valve connections. In frequent telescopic operations, they endure continuous extrusion from high hydraulic pressure, friction from reciprocating movement, and erosion from hydraulic oil contaminants—easily leading to rubber aging, compression set, and surface abrasion. These precision O-rings adopt oil-resistant, high-elasticity rubber materials, ensuring reliable sealing performance under cyclic load conditions and effectively preventing hydraulic oil leakage.
No. | Product Name | Specification | Material | Primary Wear Causes | Damage Prevention Notes |
1 | O-ring | 120×3.1 | Nitrile Butadiene Rubber (NBR) 70 Shore A; superior oil resistance and tensile strength | 1. High hydraulic pressure causes extrusion deformation and compression set; 2. Friction with reciprocating piston rods leads to surface wear. | 1. Ensure the sealing groove is clean and free of burrs before installation; 2. Maintain hydraulic system pressure within the O-ring’s rated limit (≥16 MPa) to avoid extrusion damage. |
2 | O-ring | 120×5.7 | FKM (Viton) 75 Shore A; high-temperature resistance (up to 200°C) and chemical stability | 1. Thermal cycling from hydraulic oil temperature fluctuations causes rubber cracking; 2. Contamination from construction dust and metal particles abrades the O-ring surface. | 1. Install a 10μm precision hydraulic oil filter to remove contaminants; 2. Store O-rings in a cool, dark, ozone-free environment to prevent premature aging. |
2. Specialized Seal Components
Specialized seal components (YX seal ring, CKW1200 seals) are core elements for piston and cylinder barrel sealing in JJ Series telescoping cylinders. They endure extreme pressure from telescopic load-bearing, continuous friction with cylinder inner walls, and impact from sudden load changes—easily leading to seal lip damage, material wear, and hydraulic leakage. These components adopt high-strength, wear-resistant materials with precision machining, ensuring excellent sealing performance and long service life in heavy-duty telescopic operations.
No. | Product Name | Specification | Material | Primary Wear Causes | Damage Prevention Notes |
1 | YX seal ring | D120 | Polyurethane (PU) with fabric reinforcement; high wear resistance and pressure resistance | 1. High-pressure hydraulic oil causes extrusion of the seal lip; 2. Friction with the cylinder inner wall leads to lip wear and deformation. | 1. Ensure the cylinder inner wall surface roughness is ≤ Ra 0.4μm; polish or replace worn cylinders promptly; 2. Apply a thin layer of hydraulic oil to the seal lip before installation to reduce initial wear. |
2 | Seals | CKW1200 | FKM (Viton) integrated with metal skeleton; high-temperature resistance and structural stability | 1. Thermal aging from prolonged exposure to high-temperature hydraulic oil; 2. Lateral forces from telescopic misalignment cause uneven wear. | 1. Monitor hydraulic oil temperature; avoid continuous operation above 120°C; 2. Check cylinder telescopic alignment regularly; correct misalignment exceeding 0.05mm to balance load distribution. |
3. Dust-Proof & Detent Ring Components
Dust-proofing rings and detent rings play key roles in contamination prevention and component positioning for JJ Series telescoping cylinders. Dust-proofing rings endure friction from telescopic movement and impact from external debris, while detent rings bear positioning stress from load changes—easily leading to ring wear, deformation, and loss of function. These components adopt high-strength materials with precision processing, ensuring effective dust blocking and stable positioning in harsh construction and mining environments.
No. | Product Name | Specification | Material | Primary Wear Causes | Damage Prevention Notes |
1 | Dust-proofing ring | CG21-110 | Polyurethane (PU) with steel frame; high wear resistance and dust blocking capability | 1. Continuous friction with the telescopic piston rod causes lip wear; 2. Large solid particles (sand, gravel) impact and scratch the seal lip. | 1. Regularly clean the piston rod surface and dust-proofing ring lip to remove accumulated debris; 2. Replace the dust-proofing ring promptly if lip wear exceeds 1mm to avoid dust ingress. |
2 | Detent ring | CG62-120 | 65Mn spring steel; heat-treated, hardness HRC 48-52 | 1. Repeated positioning stress from telescopic load changes causes fatigue failure; 2. Corrosion from humid construction environments and hydraulic oil contamination. | 1. Regularly clean the detent ring surface and apply anti-corrosion lubricant; 2. Avoid sudden load impacts during telescopic operation to reduce stress on the ring. |
3 | Detent ring | CQ4-120 | 65Mn spring steel; precision stamping and heat treatment for tight tolerance | 1. Improper installation leads to uneven stress distribution and deformation; 2. Metal-to-metal friction with moving components causes wear. | 1. Ensure the detent ring is fully seated in the groove during installation; 2. Keep the hydraulic system clean to avoid metal particle contamination that accelerates wear. |
Procurement Guidance
All components in the JJ Series Telescoping Cylinder Repair Kit are manufactured in strict compliance with OEM standards and GB/T 3452.1-2005 (Hydraulic Fluid Power - O-rings - Part 1: Dimensions, Tolerances and Appearance Quality) requirements, ensuring perfect compatibility and reliable performance. For construction and mining operations aiming to minimize equipment downtime, reduce maintenance costs, and ensure safe and efficient telescopic cylinder operation, these high-quality spare parts provide a comprehensive and trustworthy solution. We invite you to contact our professional sales team to discuss your specific procurement needs, obtain detailed technical specifications, and secure authentic, industry-compliant components tailored to your JJ Series telescoping cylinder maintenance requirements.
Technical Reference Standards
All products adhere to international and industry authoritative standards, including ISO 608-2018 (Rolling Bearings - Radial Bearings), ASTM D2000 (Standard Classification System for Rubber Products in Automotive Applications), GB/T 3452.1-2005 (Hydraulic Fluid Power - O-rings), and ISO 9001 Quality Management System Certification. Each component undergoes rigorous quality testing, including dimensional accuracy verification, material hardness testing, and sealing performance evaluation under simulated high-pressure telescopic conditions. For detailed installation guidelines, maintenance procedures, and technical support, please consult our dedicated technical team to ensure optimal component performance and JJ Series telescoping cylinder operational reliability.
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