Tractor Hydraulic Cylinders

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

 

Agricultural tractor hydraulic cylinders must withstand harsh outdoor conditions, including continuous pressure spikes, dirt contamination, lateral movement, and prolonged chemical exposure from fertilizers and rain.

This heavy-duty welded hydraulic cylinder series is built specifically for tractor applications such as three-point hitches, front-end loaders, backhoe attachments, steering systems, and hydraulic rippers. By combining precision-honed steel tubing, hardened induction chrome plating, and multi-stage sealing packages, these units deliver stable linear actuation under variable field conditions without fluid bypassing or pressure decay.

 

 

Parameter	Standard Range / Specification	Notes / Options
Bore Size	40 mm - 250 mm (1.5" - 10")	Custom bore sizes available upon request
Rod Diameter	20 mm - 160 mm (0.75" - 6.3")	Hardened options for high side-load applications
Stroke Length	Up to 3,000 mm (118")	Custom stroke tolerances maintained within +/- 0.5 mm
Operating Pressure	16 MPa - 31.5 MPa (2,300 PSI - 4,500 PSI)	Peak pressure rating up to 35 MPa
Cylinder Tube Material	E355 / ST52.3 / 20# cold-drawn seamless tube	Honed internal finish Ra <= 0.2 um
Piston Rod Material	42CrMo / 45# carbon steel	Induction hardened (HRC 50-55), hard chrome plated
Chrome Plating Thickness	25 - 30 um	Salt spray test resistance: 96h - 500h (NSS)
Sealing System	Hallite / NOK / Parker polyurethane & PTFE seals	Rated temperature: -30 deg C to +110 deg C (-22 deg F to +230 deg F)
Mounting Types	Clevis, spherical eye, cross-tube, pin-eye, flange	Bushings: hardened steel, bronze, or composite
Fluid Compatibility	Standard mineral-based hydraulic oils	Biodegradable / synthetic oil options

 

 

Contamination-Resistant Sealing Assembly: Features a double-lip TPU wiper combined with a primary PTFE step-seal to clear dry mud, crop residue, and moisture before the rod retracts into the gland.
Micro-Honed Bore Surface: Cold-drawn seamless steel tubing honed to Ra <= 0.2 um minimizes internal seal wear, prevents micro-bypass, and ensures consistent operation across low- and high-speed extension cycles.
Induction-Hardened Chrome Rod: Rod surfaces undergo high-frequency induction hardening before chrome application. This increases impact resistance against rock strikes, gravel debris, and bending forces during offset load lift operations.
High-Fatigue Welded End Caps: Automated robotic MIG welding produces deep-penetration full-circumference welds on end caps and mounting ports, eliminating structural failure under high-pressure spikes.
Integrated Valve Block Ports: Ports can be machined directly to accept counterbalance valves, pilot-operated check valves, or pressure-relief valves to prevent drift during transport or sustained hold operations.

 

 

Engineering Solutions by Operational Challenge:
Side Load / Offset Force: Reinforced Wear Bands -> Protects Seal & Rod
Pressure Spikes / Shock: Ductile Iron Piston -> Prevents Deformation
Dust, Mud, Chemical Spills: Double-Lip Wiper -> Keeps Oil Clean

Detailed Design Features by Application:
Front-End Loaders: Front loaders experience continuous dynamic loads and side forces when scooping uneven terrain. To prevent premature wear on the gland seals, rod guides feature extended wear-ring surface areas made of bronze-filled PTFE or woven glass fabric to distribute lateral stresses safely.
Three-Point Hitches & Implements: Three-point hitch lifters require strict position retention without drift when implements like plows or seeders are raised during road transport. Internal pistons feature zero-leakage dual-acting step seals with elastic energizers, holding pressure stable under full payload.
Hydraulic Steering Systems: Steering actuators need immediate response times without stick-slip behavior at micro-adjustments. Low-friction Glyd-rings on the piston ensure smooth linear transition under lower operating pressures.

 

 

Agricultural Tractors: Front loaders, rear lift arms, power steering, implement draft control.
Tractor Attachments: Rotary cutters, hydraulic blade angle control, backhoe booms, log splitters, post-hole diggers.
Harvesting Equipment: Combine headers, grain cart unloaders, baler compression units.
Tillage Equipment: Hydraulic fold-up frames, disk harrows, subsoilers, seed drills.

 

 

Core Configuration Areas:
Mounting Types: Clevis, Cross-Tube, Spherical Eye
Sealing Packages: High Temp, Low Temp, Agri-Duty
Integrated Valves: Overcenter, Pilot-Check
Proportions: Custom Stroke / Bore Ratios
Surface Coatings: Polyurethane, Epoxy, Zinc

Detailed Specifications:
Mounting Interfaces: Custom eye-to-eye distances, pin hole diameters, clevis widths, spherical bearing options, or cross-tube configurations matching OEM tractor brackets.
Port Types & Positions: NPT, SAE O-ring boss (ORB), BSPP, or metric threads positioned at 90 deg, 180 deg, or custom angles to simplify hose routing.
Protective Coatings: Custom single-pack or two-pack polyurethane paint coatings matched to OEM RAL colors, surviving 500-hour salt spray testing. Optional stainless steel rod guards protect against heavy impact.
Cushioning Options: Adjustable or fixed mechanical end-of-stroke cushioning to reduce operational noise, impact shocks, and wear on tractor frame joints.

 

 

Material Selection & Inspection: Raw seamless steel tubing and steel bars undergo chemical analysis and ultrasonic flaw detection before processing.
Machining & Skiving: Tubes are skived and roller-burnished or honed to reach target surface finish and strict roundness tolerances. Rods are turned on precision CNC lathes.
Heat Treatment & Plating: Rods undergo induction hardening, followed by precision grinding, hard chrome plating, and multi-stage polishing.
Robotic Welding: Ports and mounting end-eyes are joined using automated MIG/MAG welding setups with regulated thermal input to maintain geometric symmetry.
Ultrasonic Washing: All components pass through multi-tank ultrasonic cleaning stations to eliminate iron chips, dirt, and cutting fluid residues before assembly.
Clean-Room Assembly: Seals and components are fitted inside dust-controlled assembly bays to prevent seal contamination.

 

 

Every single production unit undergoes 100% factory hydraulic testing prior to surface treatment and packing.
Proof Pressure Test: Cylinders are subjected to 1.5 times the maximum working pressure to confirm structural integrity of tube walls, end caps, and welds.
Internal Leakage (Bypass) Test: Holding pressure is monitored across both stroke ends for a minimum set duration. Pressure drop must remain at zero bar.
Low-Pressure Start Test: Verifies smooth piston movement without binding or stick-slip effect under low-pressure operation (<= 0.5 MPa).
Dimensional & Surface Integrity: 100% check on mounting pin hole centers, thread pitch, rod runout, and surface roughness (Ra).
Plating & Coating Verification: Plating thickness measured via magnetic gauge; paint adhesion tested via cross-hatch tape test.

 

 

To get an accurate engineering drawing and quotation, please provide the following technical parameters:
Dimensional Profile: Bore diameter, rod diameter, stroke length, and closed pin-to-pin distance (retracted length).
Mounting Requirements: Mount type for base and rod end (e.g., cross-tube, clevis, pin eye), pin hole diameter, and bush type.
Working Pressure: Standard operating pressure and maximum system peak pressure.
Application Type: Specific tractor model or attachment function (e.g., loader tilt, hitch lift, steering).
Port Configuration: Thread type (SAE, BSPP, Metric, NPT), size, and orientation relative to mounting pins.
Environmental Factors: Operating temperature range, exposure to corrosive agents, or special paint/plating requirements.
Order Volume: Initial batch quantity and expected annual volume.

 

 

Hot Tags: tractor hydraulic cylinders China, manufacturers, suppliers, factory, company, high-quality, buy, products, Construction Equipment Eye Mounted Hydraulic Cylinder, Custom Foot Mounted Hydraulic Cylinder, Custom High Tonnage Hydraulic Cylinder, Custom Made Industrial Hydraulic Cylinder, Dump Truck Eye Mounted Hydraulic Cylinder, OEM Pin Mounted Hydraulic Cylinder