Hydraulic Cylinder for Harvester

1. Product Definition & Application Scenarios

1.1 Product Definition

We make dedicated hydraulic cylinders for all kinds of harvesting machines, including combine harvesters, corn and rice harvesters. These components convert hydraulic power into straight-line movement, and are made tough enough to cope with harsh working conditions on farms. It converts hydraulic pressure into linear mechanical force to drive critical moving parts on the harvester.

Unlike general-purpose industrial cylinders, it is engineered for high vibration, heavy dust, mud, wide temperature swings and long-hour continuous operation in farm fields. Core characteristics: stable low-speed movement, strong impact resistance, reliable sealing, and long fatigue life.

1.2 Application Scenarios

This hydraulic cylinder is perfectly matched with mainstream harvester models for large-scale commercial farms in North America, Europe, Australia and Southeast Asia, adapting to local large-area mechanized harvesting operations:

Typical positions:

• Header lifting cylinder: Applied to grain harvesting on vast flat farms in the United States, Canada and Australia. It flexibly adjusts cutting height to adapt to uneven field ground and different crop growth heights, reducing grain loss during large-scale continuous harvesting.
• Reel adjustment cylinder: Suitable for European wheat and barley harvesting scenarios, optimizing crop feeding angle to solve feeding blockage caused by dense crop planting in overseas high-yield farmland.
• Grain tank unloading cylinder: Designed for large-capacity harvesters used on American corn and soybean farms, supporting frequent high-speed unloading operations to improve overall harvesting efficiency for large-area farmland.
• Threshing gap adjustment cylinder: Adapt to diversified crop harvesting in European mixed planting areas, adjusting threshing clearance for wheat, rice, corn and soybeans to meet local multi-crop rotation harvesting needs.
• Chassis leveling cylinder: Widely used on hilly farmland in Southern Europe and Southeast Asia, keeping harvesters stable on sloped fields and ensuring normal operation in complex overseas terrain.

2. Technical Specification Parameters

2.1 Parameter Table

3. Material & Manufacturing Process

3.1 Main Materials

• Cylinder barrel: 27SiMn or 45# seamless steel pipe (GB/T 8713-2018). High tensile strength, good weldability, pressure resistance up to 40 MPa.
• Piston rod: 45Cr / 40Cr medium-carbon alloy steel.
• oQuenched + tempered (HRC 28–34) for toughness and impact resistance.
• oSurface hard chrome plating (25–30 μm), HV ≥800, anti-rust, anti-wear, mud-resistant.
• Piston & guide bushing: Cast iron + ductile iron, wear-resistant, good fit with seals.
• Seal set: Imported composite seals: FKM main seal + HNBR dust seal + PTFE wear ring. Resists high temperature, muddy water, and frequent reciprocation.

3.2 Key Processes

1.Barrel inner honing: Precision honing to Ra ≤0.4 μm, mirror surface, low friction, no oil leakage, long seal life.

2.Rod grinding & hard chrome plating: CNC grinding ensures straightness ≤0.1 mm/m; automatic chrome plating line for uniform thickness and adhesion.

3.Welding: Full-penetration CO₂ welding on end caps and clevises; non-destructive testing (UT/MT) for critical welds.

4.Assembly & testing:

• Cleanroom assembly to avoid dust entering the
• 100% pressure test: 31.5 MPa hold pressure for 3–5 minutes, no leakage, no permanent deformation.

5.Surface treatment: Shot blasting + two-component anti-corrosion paint, salt spray resistance ≥500 hours, suitable for long-term outdoor farm use.

4. Industry Application Examples

Case 1 – Wheat/Rice Combine Harvester

• Cylinder: 50/25-250 mm double-acting for header lift; 63/32-400 mm for grain tank unloading.
• Working condition: 12–14 hours/day continuous operation during harvest season; ambient temp 35–40 ℃, heavy dust, occasional muddy water.
• Performance: Stable lifting, no stuck; leakage rate <0.5% in 1,000 hours; effectively reduces harvest loss to ≤2%.

Case 2 – Corn Harvester

• Cylinder: 63/32-320 mm for header lifting; 50/25-200 mm for ear unloading mechanism.
• Working condition: Frequent impact, high vibration, dusty corn stalk debris, temperature down to -15 ℃ in early spring.
• Performance: Withstands impact load 2–3× rated pressure; low-start performance good; service life reaches 3,500–4,500 hours under normal maintenance.

Case 3 – Small Hillside Harvester

• Cylinder: 40/20-150 mm compact double-acting cylinder for body leveling and header control.
• Working condition: Narrow field, frequent turning, muddy roads, high humidity year-round.
• Performance: Compact size, flexible action; good sealing in humid/muddy environment; easy on-site maintenance.

5. FAQ

（1）Q: Is this hydraulic cylinder suitable for all brands of harvesters?

A: Standard models fit most mainstream harvesters. We also support customized size and installation dimensions for special equipment.

（2）Q: How long is the service life under normal use?

A: Under standard working conditions, the normal service life can reach more than 2000 working hours. Regular oil replacement and cleaning can further extend its service life.

（3）Q: What should I do if oil leakage occurs during use?

A: Oil leakage is mostly caused by aging or damage of sealing rings. Just replace the matched sealing kit, no need to change the whole cylinder.

（4）Q: Can it work normally in low temperature winter?

A: Yes. The product is tested for low temperature resistance within -20℃. It is recommended to use low-temperature hydraulic oil in cold areas for better performance.