Agricultural Implement Hydraulic Cylinders

Tonghesheng Machinery is one of the competitive manufacturers and suppliers of high-quality agricultural implement hydraulic cylinders, and we are also equipped with a professional factory, welcome to buy agricultural implement hydraulic cylinders products from our company.

 

Agricultural implement hydraulic cylinders operate under severe environmental conditions, including constant exposure to dirt, moisture, agricultural chemicals, and shock loads caused by uneven field terrain. Engineered for heavy-duty soil tillage, seeding, harvesting, and material handling equipment, these welded and tie-rod double-acting hydraulic cylinders provide consistent linear force up to 3,000 PSI (20.7 MPa) working pressure.

Factory manufacturing capabilities accommodate bore sizes from 1.5" to 8" (38 mm to 203 mm) and strokes up to 120" (3,048 mm). Designed for direct integration into OEM agricultural machinery, every unit undergoes full pressure testing before shipment to guarantee zero-leakage performance during critical seasonal operations.

 

 

Feature / Parameter	Standard Specification	Custom Options Available
Bore Size	1.5" – 8.0" (38 mm – 203 mm)	Up to 12" (305 mm)
Stroke Length	Up to 120" (3,048 mm)	Custom stroke limits / depth stops
Working Pressure	2,500 PSI – 3,000 PSI (17.2 MPa – 20.7 MPa)	Up to 4,500 PSI (31.0 MPa)
Operating Temperature	-20°F to 210°F (-29°C to 99°C)	-40°F to 250°F (-40°C to 121°C) low-temp/high-temp seals
Cylinder Barrel Material	ST52, E355, or 1045 cold-drawn honed steel tubing (Roughness Ra <= 0.4 um)	Heavy-wall seamless tube for high pressure
Piston Rod Material	C45 / 1045 carbon steel, precision ground and hard chrome plated (Min. 25–30 microns)	42CrMo / 4140 alloy steel, induction hardened
Piston Seals	Heavy-duty polyurethane compact seal with dual wear rings	Hallite, Parker, or NOK multi-piece seals
Rod Seals	U-cup polyurethane seal with metal-cased wiper	Double-lip wiper for harsh dirt protection
Mounting Types	Clevis, cross-tube, pin-eye, flange, or trunnion	Custom clevis widths and pin sizes
Port Types	NPT, SAE ORB (O-Ring Boss), or BSPP	Re-positioned ports or integrated valves

 

 

Contamination-Resistant Sealing System: Uses a multi-stage seal setup featuring a poly-glyd piston ring, primary U-cup rod seal, and a steel-cased wiper ring. This arrangement prevents soil, crop residue, and moisture from penetrating the fluid chamber, protecting internal components from premature abrasive wear.
Corrosion-Resistant Rod Treatment: Standard hard chrome plating passes a minimum 96-hour neutral salt spray test (ASTM B117). For high-corrosion environments like fertilizer spreaders, induction-hardened chrome or nitrocarburized finishes pass up to 500 hours NSS test.
High-Yield Welded Steel Tubing: Barrels are manufactured from cold-drawn ST52/E355 seamless tubing, interior-honed to a mirror finish (Ra <= 0.4 um). This minimizes seal friction, cuts heat build-up, and extends seal life during high-cycle usage.
Forged Steel End Caps and Mounts: Ductile iron pistons and forged steel clevis ends handle lateral shock loads during rapid implement transport over rough ground without structural deformation.
Integrated Mechanical Stroke Control: Optional mechanical stroke control segment collars or hydraulic depth-control valves allow operators to set consistent working depths across wide field implements.

 

 

Hydraulic System Protection: Hydraulic fluid from tractor/implement lines passes through an optional dual counterbalance valve to hold position and prevent load drift before reaching the cylinder. The assembly uses forged steel end mounts, induction-hardened chrome rods, honed ST52 tubing, and heavy-duty piston seals.
Tillage Machinery (Plows, Discs, Cultivators): High dynamic side loads occur when ground-engaging tools strike subterranean obstacles. Cylinders feature induction-hardened rods (55–60 HRC depth) and wider piston wear bands to distribute lateral forces and prevent rod bending.
Planters and Seeders: Precision row-unit downforce control requires zero hydraulic drift. Cylinders integrate pilot-operated check valves or dual counter-balance valves directly onto the cylinder ports, holding set pressure over long operating periods.
Combine Harvester Headers: Variable speed header lifting requires smooth extension without stick-slip motion. Micro-finished tube interiors combined with low-friction PTFE piston seals ensure steady control under varying header loads.
Front-End Loaders & Telehandlers: High-frequency cycling produces rapid heat generation. Cylinders utilize high-temperature-grade polyurethane seals and reinforced wiper geometry to handle friction heat and external dirt accumulation.

 

 

Tillage Equipment: Hydraulic fold systems for wide-frame disc harrows, deep-ripper shank lift cylinders, and gang angle adjustments.
Planting & Seeding: Planter frame folding, seed drill toolbar depth control, and marker arm actuation cylinders.
Harvesting Machinery: Combine header height control, grain tank extension unfolders, and forage harvester spout positioning.
Hay & Forage Equipment: Round baler door latching, square baler tensioning, and rake frame lifting.
Material Handling & Utility: Front-end loader bucket tilt and lift cylinders, rotary cutter deck height adjusters, and livestock trailer ramp actuators.

 

 

We manufacture custom hydraulic cylinders built to exact OEM engineering drawings and performance specifications:
Mounting Styles: Clevis, Cross-tube, Spherical Bearing, Pin Eye, Flange, or custom trunnion locations matching existing frame pinouts.
Rod Finishes: Hard Chrome-plated, Induction Hardened, Nitrided, or custom micro-finished surfaces.
Valve Integration: Factory-welded counterbalance valves, pilot-operated check valves, or thermal relief valves to prevent uncommanded movement during line failure.
Port Layouts & Types: Standard SAE O-Ring Boss (ORB), NPTF, BSPP, or custom manifold blocks welded directly to the cylinder barrel.
Specialized Finishes: Custom polyurethane wet paint or powder coating matched to OEM brand colors, tested for 240-hour salt spray resistance.

 

 

Production follows a strict 5-step manufacturing and quality control sequence:
Material Selection & Inspection: Incoming ST52/E355 hollow bars and C45/42CrMo steel rods are verified for chemical composition and mechanical properties via heat-lot mill test reports (MTR).
Precision Machining: CNC lathes turn piston rods and cylinder caps. Cylinder barrels are bored and skived to achieve internal tolerances within ISO H8/H9.
Friction & MIG Welding: Clevis bases and ports are attached using automated robotic MIG or friction welding equipment, delivering consistent weld penetration without heat distortion.
Rod Surface Treatment: Rods undergo precision centerless grinding, induction hardening (optional), and hard chrome plating, followed by super-finishing to Ra <= 0.2 um.
Cleanroom Assembly & Testing: Component washing precedes cleanroom assembly, followed by 100% hydraulic testing and final paint coating.

 

 

Quality control protocols govern every production stage to ensure zero defects prior to customer shipment:
100% Hydraulic Pressure Testing: Every assembled cylinder is tested on automated test benches. Tests include proof-pressure testing at 1.5x working pressure and internal bypass testing to confirm zero piston seal leakage.
Dimensional Verification: Coordinate Measuring Machines (CMM) and air gauging check pinhole alignment, stroke limits, port positions, and mounting dimensions against approved CAD drawings.
Surface Roughness & Coating Thickness Testing: Profilometers measure barrel and rod surface roughness (Ra). Magnetic gauge meters verify paint film thickness and chrome layer depth (minimum 25 microns).
Oil Cleanliness Rating: Fluid flushing meets ISO 4406 cleanliness standard 18/16/13, preventing hydraulic valve contamination upon initial machine setup.

 

 

To receive an accurate technical proposal and commercial quote within 24–48 hours, provide the following key specifications:
Application / Equipment Type: E.g., 12-row planter fold system, 30ft disc harrow.
Dimensional Parameters: Bore size, rod diameter, stroke length, and closed retractor center-to-center pin distance.
Operating Pressure: Normal working pressure (PSI/Bar) and maximum peak shock pressures.
Mounting & Porting: Desired mounting style (clevis, cross-tube, pin size) and port type/orientation (SAE-8, NPT, BSPP).
Environmental Requirements: Ambient operating temperature ranges, expected exposure to chemicals/fertilizers, and paint specification/color.
Commercial Scope: Initial sample requirements, target annual purchase volume (EAU), and delivery terms (FOB, CIF, DDP).

 

 

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