We at Jiaheng Hydraulic specialize in manufacturing excavator hydraulic cylinders, tunnel construction hydraulic cylinders, crane hydraulic cylinder, and heavy-duty mobile equipment cylinders for global engineering and mining OEMs, rental fleets, and aftermarket suppliers. Our offerings cover boom cylinders, arm (stick) cylinders, bucket cylinders, trunnion cylinders, and custom non-standard cylinders for brands such as CAT, Komatsu, Hitachi, Volvo, Sany, XCMG, etc.
Excavator Hydraulic Cylinder Types
Boom Cylinder (used for lifting boom)
Arm / Stick Cylinder (controls dipper/arm motion)
Bucket Cylinder (controls bucket tipping / curl)
Trunnion / Swing Cylinder (for specialty designs)
Telescopic / Multi-stage Cylinders (for specific mobile rigs)
Each cylinder is available in OEM spec, aftermarket, or rebuilt versions. We can also design custom cylinders according to customer drawings or field samples.
Tunnel Machinery / Underground Equipment Cylinders
Long stroke, high pressure cylinders used in tunnel boring machines (TBM), roadheaders, shield machines
Sealing design, corrosion resistance, compact mounting for confined spaces
Heavy duty materials with high fatigue life
Technical Design & Key Parameters
Dimension & Compatibility
To ensure proper replacement or cross-compatibility, we require: bore diameter, rod diameter, stroke length, mounting type (clevis, trunnion, flange), port size, pin centers. Provide OEM part numbers when available.
Materials & Surface Treatment
Cylinder barrel: high-strength alloy steel
Piston rod: 42CrMo or equivalent, hard chrome plating for wear & corrosion resistance
Seal elements: premium U-cup seals, piston seals, wipers, rod seals
Surface finish, plating, anti-rust coating
Seal & Leakage Control
Multi-stage sealing (rod seal + backup seal + wiper)
Low friction, long life sealing, high temperature / heavy contamination resistance
Quality tests: pressure test, leakage test, life cycle test
Performance & Fatigue Life
Designed for millions of cycles under load
Finite element analysis (FEA) for stress distribution
Safety factor, load capacity margin
Our Manufacturing, Quality Assurance & Testing
Production Process
Precision forging / steel sourcing
CNC boring / grinding / honing
Chrome plating / polishing
Assembly in clean room conditions
Quality Control & Testing
100% pressure testing / leak checking
Stroke test under load
Straightness and deflection measurement
Material certificate, hardness test, tensile test
Warranty & After-sales
Standard warranty (e.g. 12 months or specific cycle life)
Spare seal kits and maintenance parts
Repair / rebuild service
Why Choose Jiaheng Hydraulic
✔ Rich experience in mobile & tunnel equipment cylinders
✔ Strong R&D & customization capability
✔ Strict QC, ISO / industry certifications
✔ Competitive pricing with reliable quality
✔ Custom / Non-standard Cylinder Capability
✔ Accept drawings / 3D models / samples
✔ Reverse engineering & refurbishment
✔ Quick prototyping & small batch runs
FAQ
Q: Can your cylinders be drop-in replacement for CAT / Komatsu / Hitachi?
A: Yes, when matching parameters we can make direct-fit / cross-compatible versions.
Q: What is your lead time and MOQ?
A: Typically 2 to 4 weeks, MOQ depends on design / size.
Q: Can you provide custom design / small batch?
A: Yes, we have R&D & prototyping capacity for custom cylinders.
