Description
HH-YG45*220 Hydraulic Cylinder
55mm Bore ?? 45mm Rod ?? 220mm Stroke
Ever-power presents the HH-YG45*220 ?? a high-performance hydraulic cylinder featuring a precisely machined 55mm bore, a corrosion-resistant 45mm rod, and an optimized 220mm stroke length for seamless integration into OEM steering assemblies.
HH-YG45*220
55 mm
45 mm
220 mm
380 mm
Ever-power has established itself as a premier industrial hydraulic cylinders through consistent quality and responsive support.
Product Overview
The HH-YG45*220 optimizes the 55mm bore area and 45mm rod annulus relationship. This geometry produces predictable force in both extension and retraction, eliminating jerky motion. The multi-lip seal ?? PTFE-bronze wiper, PU U-cup, and nitrile O-ring ?? maintains leak-free operation from arctic cold to tropical yards. The compact 55mm bore generates sufficient steering force for light-to-medium forklifts.
Maintenance intervals depend on duty cycle severity. Under normal warehouse conditions with clean fluid, inspect rod surface and wiper seal condition every 500 operating hours. Replace seal kit proactively at 4,000 hours to prevent unplanned downtime during critical operations.
Key Features
Balanced Force Geometry
The 55mm ?? 45mm bore-to-rod ratio is optimized to produce predictable push and pull force characteristics. This eliminates jerky steering response during rapid pressure transients when navigating tight warehouse aisles or maneuvering in congested loading dock areas.
Induction-Hardened Core
The 45mm rod core achieves HRC 28-32 through induction hardening prior to chrome deposition. This substrate hardness supports the chrome layer against denting from impact loads during dock operations, pothole traversal, and rough terrain encountered in outdoor yard applications.
Cleanroom Assembly
Pistons and seals are installed in a controlled environment maintaining particle counts below Class 1000 levels. This prevents airborne contamination from causing internal scoring of precision-honed surfaces and premature seal degradation during initial break-in period.
CMM Verification
Coordinate Measuring Machine inspection confirms all critical dimensions including bore diameter, rod concentricity, stroke length accuracy within ??0.5mm, and mounting hole positional tolerances before release from quality hold.
Our custom hydraulic cylinders expertise ensures every unit exceeds OEM benchmarks at lower lifecycle cost.
Technical Specifications
| Parameter | Value |
|---|---|
| Model | HH-YG45*220 |
| Bore | 55.0 mm |
| Rod | 45.0 mm |
| Stroke | 220.0 mm |
| Mount | 380.0 mm |
| Work Pressure | 25 MPa |
| Test Pressure | 37.5 MPa |
| Burst | 62.5+ MPa |
| Temp Range | -30??C to +100??C |
| Fluid | Mineral Oil |
| Barrel | 27SiMn Seamless |
| Rod Surface | Hard Chrome 20+??m |
| Mounts | Pin Eye / Clevis |
| Ports | G1/4 or M14x1.5 |
Working Principle
Through Pascal’s principle, pressurized oil from the gear pump enters the HH-YG45*220’s 55mm bore. At 16-21 MPa typical for forklifts, pressure acts on the piston face creating force proportional to the bore area. The 45mm rod emerges, pivoting the steering linkage through an arc from 220mm stroke and lever geometry. Reversing the wheel switches valve position, pressurizing the rod-side chamber. The differential area means extension force exceeds retraction force.
Applications
The HH-YG45*220 is purpose-built for forklift steering systems where precise angular control and rapid response are non-negotiable. Its 55mm bore generates torque to pivot steer wheels through full arc, even when stationary and loaded. Narrow-aisle warehouses benefit from consistent steering feel reducing operator fatigue during long shifts. The unit also suits AGVs where repeatability determines navigation accuracy along defined paths. Marine terminal operations and cold storage facilities particularly value the responsive steering and low-temperature seal performance.
Brand Compatibility
This 55mm bore cylinder directly replaces OEM actuators on Clark, Doosan, and Hyundai forklift series. Ever-power maintains a dimensional database cross-referencing over 2,000 OEM part numbers ensuring physical and hydraulic compatibility without machine modification. Fleet managers running mixed-brand operations appreciate inventory consolidation ?? one Ever-power part number replaces multiple OEM references while maintaining OEM-level performance and reliability in demanding shift work.
Explore our resource on hydraulic cylinder manufacturer for installation tips and maintenance.
Customization Options
Beyond the standard 55mm ?? 45mm ?? 220mm, Ever-power offers engineering to modify this cylinder for unique installations. Our team reviews drawings and delivers tailored solutions in 10-15 business days.
Stroke
Extended/reduced from 220mm. Max depends on 45mm rod buckling.
Ports
BSPP, NPT, SAE in side, rear, or manifold orientations.
Rod End
Male/female threads, spherical bearings, clevis forks.
Seals
Viton for heat, PU for abrasion, PTFE for low friction.
Manufacturing & Quality
Manufacturing begins with material inspection ?? 27SiMn steel at 520MPa yield verified. CNC turning machines shape the 55mm barrel OD and cap threads to H8. Honing produces the critical bore finish. Pistons are CNC’d from ductile iron with PTFE bands, assembled in Class 1000 cleanroom. Every cylinder pressure-tested at 1.5?? rating for 60 seconds.
Material
55mm barrel, mill certs
CNC
55mm bore honed H8
Chrome
Rod ??20??m, HV900
Assembly
Cleanroom, torqued
Test
1.5??, 60s hold
CMM
Dimensional report
How to Select the Right Hydraulic Cylinder
Specifying the correct hydraulic cylinder requires matching physical dimensions, force requirements, and environmental conditions. For the 55mm bore, 45mm rod, 220mm stroke, and 380mm mounting distance of your application, verify each parameter systematically against your equipment drawings and operating specifications to ensure proper fit and function.
- Verify Bore Diameter
The 55mm bore produces 47N at 20 MPa. Measure existing bore or calculate from system pressure and required force. Ensure the bore matches your hydraulic pump output and valve capacity. - Confirm Rod Diameter
The 45mm rod must withstand side loads from steering linkage. Verify rod end threads match knuckle arm. Check chrome surface is free of scoring that would damage seals during operation. - Measure Stroke Length
Measure full linear travel from retracted to extended. The 220mm stroke must equal or exceed this distance. Consider internal cushioning requirements for smooth deceleration.
Structural Components
The 55mm barrel forms the pressure vessel from seamless 27SiMn tubing with honed interior serving as piston bearing surface. End caps are precision-threaded steel forgings containing inlet ports and attachment points. Inside, the ductile iron piston with PTFE wear rings divides the barrel into two pressure chambers. The 45mm rod extends through the gland combining wiper seal, rod seal, and bearing sleeve. Static O-rings seal barrel-to-cap joints; threading rather than welding enables future rebuild.
Cylinder Barrel
55mm honed seamless 27SiMn steel, H8 tolerance
Piston Rod
45mm hard chrome plated, HV??900, Ra 0.4??m
Piston
Ductile iron with PTFE wear bands
Gland
Threaded cartridge: seal, bearing, retention
Ever-power Technical Deep Dive
Performance Boundaries
The 55mm bore HH-YG45*220 sustains 28 MPa ?? 12% above rating ?? across 250,000 cycles with seal integrity. The 45mm rod deflects less than 0.03mm per 100mm unsupported. Thermal imaging shows barrel stabilization at 45??C above ambient.
Frequently Asked Questions
How to measure for HH-YG45*220?
Measure: extended pin-to-pin, retracted length, 55mm bore, 45mm rod, pin diameter. Stroke = extended ? retracted. Match within ??2mm.
What causes external leaks?
Rod leaks: wiper/rod seal failure or heat damage. Port leaks: loose fittings. Barrel leaks: O-ring wear. Most fixed with seal kit. Persistent leaks need exchange.
Technical drawings available?
PDF and STEP formats at no charge. Includes all dimensions, ports, mounts, weight, torque specs. Contact technical support with your request.
Delivery time?
Standard 45mm rod, 220mm stroke: 10-15 business days. Express: 5-7 days at 20% premium. Volume orders: phased delivery. Regional stock may ship immediately.
Get Your Quote Today
Get HH-YG45*220 quotation within 24 hours. We cross-reference OEM part numbers. Bulk pricing and JIT programs available. Export documentation included.
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