Custom Agricultural Hydraulic Cylinders

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

 

Custom agricultural hydraulic cylinders are built to operate under severe outdoor conditions, including continuous dirt exposure, shock loading, UV radiation, high humidity, and corrosive fertilizers. Designed specifically for OEM agricultural equipment and aftermarket replacements, these double-acting and single-acting hydraulic cylinders provide exact mechanical stroke limits, integrated mounting geometry, and seal configurations matched to specific tractor and implement duty cycles.

Compared to off-the-shelf industrial cylinders, agricultural units incorporate heavy-duty rod wipers, hardened rod coatings, and mechanical or hydraulic cushion options to handle severe mechanical impact during field operations. Every cylinder is engineered to match precise vehicle envelope dimensions and hydraulic circuit operating pressures.

 

 

Parameter	Standard Range / Specification	Notes / Options
Bore Size	1.5 in to 8.0 in (38 mm to 203 mm)	Custom sizing available per design
Stroke Length	4 in to 120 in (100 mm to 3,048 mm)	Up to 200 in for multi-stage telescopic
Operating Pressure	2,500 PSI to 4,500 PSI (17 MPa to 31 MPa)	Rated for peak shock pressure spike tolerance
Operating Temperature	-30 deg C to +100 deg C (-22 deg F to +212 deg F)	Low-temp / high-temp seal compounds available
Tube Material	ST52.3 / E355 / 1020 Precision Skived & Honed Steel	Internal surface roughness Ra <= 0.4 um
Piston Rod Material	42CrMo / AISI 4140 or C45 High-Yield Steel	Hard chrome plated 25 to 50 um thickness
Rod Surface Hardness	HRC 55-60 (Induction Hardened)	Salt spray resistance: ASTM B117 96h to 500h
Sealing System	Hallite / Parker / Custom Polyurethane & PTFE	U-cup rod seals, double-lip wipers, wear rings
Mounting Types	Clevis, Cross-tube, Pin-eye, Flange, Trunnion, Spherical	Bushings: Bronze, hardened steel, or composite
Hydraulic Ports	SAE O-Ring Boss (ORB), NPTF, BSPP, Flange	Dual port, integrated fluid manifolds available

 

 

Contamination-Resistant Sealing: Double-lip polyurethane rod wipers actively prevent fine crop dust, soil, and field debris from entering the gland packing, protecting internal seal lips from premature wear.
Induction-Hardened Chrome Rods: High-tensile steel rods feature induction hardening below the hard chrome layer to prevent rod denting from flying rocks, gravel, and implement collisions.
Heavy-Duty Clevis & Eye Mounts: Cast or forged steel end fittings with high-strength welding joints prevent fatigue cracking under cyclic torsional loads during field maneuvers.
Integral Counterbalance & Pilot Valves: Directly mounted or integrated valve blocks eliminate external hose plumbing, preventing hose bursts and controlling load lowering on heavy implements.
Corrosion-Resistant External Finish: Two-component polyurethane paint systems rated for high UV exposure and chemical resistance against liquid fertilizers, herbicides, and washdown sprayers.

 

 

Front-End Loaders: High cyclic bending moments require oversized rod diameters, induction-hardened surfaces, and integrated spherical bearings to compensate for structural deflection under off-center bucket loads.
Tillage Equipment & Rippers: Deep soil penetration creates extreme pressure spikes and high continuous vibration. Designs incorporate heavy-wall skived tubing, dynamic cushion zones, and high-tensile tie-rods or welded construction.
Grain Carts & Tipping Trailers: Require multi-stage telescopic cylinders engineered for stable, linear extension. Rods are precision-ground and chrome-plated at each stage, featuring dual-stop rings to maintain vertical alignment during side loads.
Spray Booms: Wide boom folding mechanisms require precise internal rephasing orifices or balance valves to sync cylinder pairs while operating under continuous chemical mist exposure.

 

 

Tractors: 3-Point hitches, steering linkages, power take-off (PTO) positioning.
Harvesters & Combines: Header height control, reel positioners, grain tank unloading auger swing mechanisms.
Tillage Machinery: Fold-up wings, depth control wheels, disk harrow depth adjusters.
Planters & Seeders: Down-pressure row units, marker arm actuators, fold frame lift arms.
Hay & Forage Equipment: Baler tailgate lifts, bale wrappers, mower conditioner swing arms.
Agricultural Trailers: Hydraulic tailgate locks, multi-stage dump bodies, drawbar levelling legs.

 

 

Mechanical Mountings: Custom pin sizes, spherical rod ends, clevis widths, trunnion locations, and hardened steel or self-lubricating bushing inserts.
Porting & Valve Integration: Custom port orientation, extended port blocks, integrated pilot-operated check valves, sequence valves, and counterbalance valves.
Stroke & Position Sensing: Internal linear transducers (magnetostrictive or inductive) or external proximity switches for automated implement control systems.
Material & Surface Options: Stainless steel rods (316/431) for high-salt environments, nickel-chrome rod plating, or custom color-matched OEM powder coatings.
Rephasing Cylinder Configurations: Internal bypass grooves at stroke limits to allow series hydraulic plumbing for synchronized multi-cylinder movement.

 

 

Process Workflow:
Raw Material Inspection -> CNC Machining & Skiving/Honing -> Rod Induction Hardening & Chrome Plating -> Automated Robotic Welding & Assembly -> 100% Pressure & Leak Testing -> Final Quality Gate

Steel Tube Skiving & Honing: Seamless cold-drawn steel tubing is skived and roller-burnished to achieve an internal surface finish of Ra <= 0.4 um, ensuring long seal life and low dynamic friction.
Piston Rod Machining & Heat Treatment: High-yield carbon steel bar stock undergoes CNC turning, induction hardening up to 2 mm depth, centerless grinding, and electro-plating with hard chrome (25 to 50 um).
Robotic Welding: Cylinder bases, flanges, and rod eyes are joined using automated GMAW/MIG welding processes with continuous weld monitoring to ensure deep penetration and leak-free joint integrity.
Cleanroom Assembly: All components are ultrasonic-cleaned prior to assembly in a controlled environment to eliminate metal shavings, grit, and foreign contamination that cause early valve and seal failure.

 

 

Every manufactured hydraulic cylinder undergoes rigorous quality control to verify structural integrity and hydraulic sealing before shipment:
100% Hydrostatic Pressure Testing: Each cylinder is tested at 1.5 times the rated working pressure (up to 6,000 PSI) to verify structural weld strength and seal containment.
Internal Leakage (Bypass) Testing: Pressure is held across the piston seal to measure zero-drift performance over specified hold durations.
Low-Pressure Seal Verification: Tested at low pressures (150 to 300 PSI) to verify seal lip activation and eliminate low-pressure weeping.
Dimension & Alignment Checks: Multi-axis coordinate measuring (CMM) and pin-to-pin distance checks verify exact tolerance compliance for zero-stress installation on OEM equipment assembly lines.
Paint Adhesion & Coating Thickness: Salt spray corrosion testing (ASTM B117) and cross-hatch adhesion testing per ISO 2409.

 

 

To receive an accurate technical quotation and 2D/3D CAD drawing within 24 to 48 hours, please provide the following specifications:
Operating Parameters: Maximum working pressure (PSI/Bar), system oil type, and operating temperature range.
Dimensional Requirements: Bore size, rod diameter, stroke length, and closed pin-to-pin (retracted) distance.
Mounting Configuration: End fitting types for both base and rod (e.g., clevis pin size, bush type, cross-tube length).
Hydraulic Ports: Port thread type (SAE ORB, NPT, BSPP), thread size, and relative angular orientation to mounting pins.
Duty Cycle & Application Details: Target machinery type, expected annual cycle count, and specific environmental factors (dust, salt, chemical exposure).
Estimated Annual Quantity (EAU): Initial prototype quantity and projected annual production volumes.

 

 

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