Description
QJ904??31??019 Hydraulic Cylinder
63mm Bore ?? 35mm Rod ?? 250mm Stroke
Designed to meet the rigorous demands of modern forklift steering systems, the QJ904??31??019 hydraulic cylinder from Ever-power combines a 63mm honed bore with a 35mm chrome-plated piston rod, providing smooth linear motion through 250mm of controlled travel.
QJ904??31??019
63 mm
35 mm
250 mm
639 mm
As a trusted single acting hydraulic cylinder, Ever-power delivers actuators that meet OEM specifications for material handling.
Product Overview
Ever-power engineers the QJ904??31??019 for extended service intervals. The 63mm barrel is CNC-machined from 27SiMn seamless steel with full mill certification. The 35mm rod features Ra ?? 0.4??m chrome surface minimizing friction during high-frequency steering corrections. The compact 63mm bore generates sufficient steering force for light-to-medium forklifts.
For optimal performance, specify hydraulic fluid viscosity grade appropriate for your operating temperature range. The 63mm bore and 35mm rod are optimized for ISO VG 46 mineral oil but accommodate VG 32 through VG 68 with corresponding seal compound selection at order time.
Key Features
Seamless Construction
Machined from 27SiMn seamless alloy tubing, the 63mm barrel eliminates the stress riser inherent in welded pipe construction. This provides superior fatigue resistance through millions of steering cycles under varying pressure amplitudes and directional loading conditions.
Micro-Finished Rod
The 35mm piston rod is centerless ground to Ra 0.4??m before hard chrome plating. This surface finish ensures concentric operation that extends seal life by reducing lip wear, friction heat generation, and breakout pressure during steering corrections.
Temperature Resilience
Nitrile primary seals maintain elastomeric properties from -30??C to +100??C standard operating range. Viton compound upgrades are available for continuous operation above 80??C or for compatibility with synthetic hydraulic fluids and phosphate ester media.
Complete Traceability
Material certification with mill test reports accompanies every cylinder. Serialized batch codes etched on the barrel enable complete production history retrieval from raw steel billet through final inspection and pressure testing verification.
Our industrial hydraulic cylinders expertise ensures every unit exceeds OEM benchmarks at lower lifecycle cost.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | QJ904??31??019 |
| Bore Dia | 63.0 mm |
| Rod Dia | 35.0 mm |
| Stroke | 250.0 mm |
| Mounting | 639.0 mm |
| Max Pressure | 25 MPa |
| Hydro Test | 37.5 MPa |
| Burst Min | 62.5+ MPa |
| Operating Temp | -30??C to +100??C |
| Medium | Mineral Oil |
| Tube Material | 27SiMn Seamless |
| Chrome Layer | Hard Chrome 20+??m |
| Fixing Type | Pin Eye / Clevis |
| Port Size | G1/4 or M14x1.5 |
Working Principle
The QJ904??31??019 converts hydraulic power into linear steering motion. The pump sends flow through a priority valve ensuring the steering circuit receives volume even when lift and tilt demand simultaneously. Fluid enters the 63mm bore, displacing the piston. The 35mm chrome rod translates pressure through 250mm travel. On return, fluid exits to the reservoir via filter. Cushions decelerate the piston near stroke end.
Applications
In forklift steering, the QJ904??31??019 replaces OEM cylinders on 1.5-ton to 5-ton capacity classes. The 63mm bore matches standard steering pump output ensuring compatible flow and pressure. Cold storage facilities value low-temperature seal performance where conventional units harden and leak. Port operations deploy this on reach stackers and straddle carriers where steering reliability directly impacts container throughput and vessel turnaround times.
Brand Compatibility
This 63mm bore cylinder directly replaces OEM actuators on JAC, Linde, and Crown 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 custom hydraulic cylinders for installation tips and maintenance.
Customization Options
Beyond the standard 63mm ?? 35mm ?? 250mm, 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 250mm. Max depends on 35mm 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 63mm 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
63mm barrel, mill certs
CNC
63mm 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 63mm bore, 35mm rod, 250mm stroke, and 639mm 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 63mm bore produces 62N 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 35mm 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 250mm stroke must equal or exceed this distance. Consider internal cushioning requirements for smooth deceleration.
Structural Components
The 63mm 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 35mm 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
63mm honed seamless 27SiMn steel, H8 tolerance
Piston Rod
35mm 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
Innovation
Ever-power’s R&D for 63mm bore includes embedded BLE sensors, composite barrels (-35% weight), and additive-manufactured pistons with damping channels (-40% shock). The 35mm rod PTWA coating achieves HV 800-1000 with 500+ hour salt-spray resistance.
Frequently Asked Questions
OEM direct replacement?
Yes ?? the QJ904??31??019 interchanges with popular OEM 63mm bore cylinders. Dimensions, ports, and rod ends match factory specs. Cross-reference charts available.
Rod maintenance required?
Minimal ?? wipe chrome weekly, inspect monthly for scoring. Apply hydraulic oil for long storage. Replace wiper if torn. Never paint chrome.
Custom 250mm stroke available?
Absolutely ?? 50mm to 2,000mm for this 63mm bore. Engineering review for rod stability. No minimum quantity. Feasibility in 24 hours.
Warranty for QJ904??31??019?
12 months against material and workmanship defects. Covers seals, barrel, chrome, threads under normal use. Excludes over-pressure, contamination, improper install.
Get Your Quote Today
Contact Ever-power for 63mm bore requirements. Our engineers review specs and recommend optimal configuration. OEM customers get dedicated account management.
Ever-power Manufacturing | ISO 9001 | Global Shipping | QJ904??31??019
