Header Lift Cylinder for Combine Harvester | 63mm Bore, 350mm Stroke

Model: 割台油缸 / Header Lift

Header Lift Cylinder — Combine Harvester

The header lift cylinder is the primary actuator responsible for raising and lowering the cutting platform on a combine harvester. This unit — bore 63 mm, rod 55 mm, stroke 350 mm, closed length 480 mm — is engineered for high-force, high-cycle operation across cereal, rice, soybean, and maize harvest platforms where consistent cutting height directly determines grain loss rates.

Belangrijkste specificaties

Bore Diameter63 mm
Rod Diameter55 mm
Stroke350 mm
Mounting Length480 mm

Header Lift Cylinder for Combine Harvester: Role and Operating Demands

No hydraulic function on a combine is exercised more continuously than header height control. Over a typical 500-acre harvest day, the operator adjusts header height dozens to hundreds of times — responding to slope changes, headlands, wet patches, and crop stand variation. The combine header hydraulic cylinder that handles this workload needs to be more than just a force-delivery device: it needs to be a precision positioning actuator that responds consistently, holds position under gravity-assisted header weight, and survives the cumulative fatigue of repetitive full-cycle operation.

The 63 mm bore on this cylinder is the largest in the standard combine cylinder lineup we offer. Bore area of approximately 31.2 cm² means that at 150 bar system pressure, the push force reaches approximately 46.8 kN — enough to lift and rapidly re-position headers weighing 500–900 kg, including those carrying mud and wet crop residue load that can add 20–30% to dry weight during adverse conditions.

The high rod-to-bore ratio (55/63 = 87%) is a deliberate engineering choice for this application. A thicker rod reduces the annulus-side area differential, which in practice means pull force approaches push force more closely — important when combine header designs load the cylinder in both directions during terrain following, rather than relying purely on header weight for the retract stroke.

The header lift cylinder controls cutting platform height across the full harvest pass, from headland to headland.

63mm Bore Combine Header Hydraulic Cylinder Replacement: Dimensional Compatibility Explained

When sourcing a replacement header lift cylinder, the four core dimensions — bore, rod, stroke, and closed length — must all match. Substituting a cylinder with even a 5 mm stroke variance will alter the calibrated height stops on your combine’s electronic header control system, requiring recalibration and potentially compromising auto-contour response on sloped ground.

• Bore 63 mm: Sized to the force requirements of the machine platform. Using a 55 mm bore substitute would reduce push force by approximately 24% — enough to cause sluggish response under full header load or inability to lift rapidly when the header snags on a ridge or terrace edge.
• Rod 55 mm: One of the most robust rod-to-bore combinations in agricultural cylinder design. This near-full-bore rod virtually eliminates buckling risk and allows the cylinder to handle the off-axis loads that occur when the header contacts obstacles during harvesting.
• Stroke 350 mm: The total header height travel from lowest cut position (minimum stubble height) to maximum raised position for road transport and headland turning. Any shorter, and the operator loses some range. Any longer, and the cylinder extends beyond its support geometry, risking side-load damage to the rod seal.
• Closed Length 480 mm: The pin-centre-to-pin-centre dimension in full retract. This governs bracket geometry and determines the angle at which the cylinder operates through its full stroke. An incorrect closed length changes these angles and alters the mechanical advantage curve of the lift linkage.

Dealers and farm machinery repair shops stocking aftermarket parts for Chinese-manufactured combines — including brands common across Southeast Asia, Eastern Europe, and South America — will recognise these specifications as standard across multiple mid-market combine platforms.

Sealing System and Surface Engineering for High-Cycle Agricultural Service

Header lift cylinders operate in one of the harshest environments a hydraulic component encounters: alternating between direct sun exposure, morning dew condensation, crop chaff and dust, and the vibration spectrum generated by a running thresher. The sealing and surface treatment specification of this cylinder addresses each of these degradation vectors directly.

The piston seal assembly uses a polyurethane primary seal backed by a wear-resistant guide band. Polyurethane outperforms standard Buna-N in high-cycle, slow-velocity applications — the slow speed header positioning movements that occur when the operator is trimming cutting height expose seals to boundary lubrication conditions where PU’s lower compression set and better abrasion resistance reduce internal leakage development over the cylinder’s service life.

Rod seals are a two-element design: a primary polyurethane lip seal and a secondary dust wiper. The dust wiper is critical in this application because airborne chaff and grain dust is an effective abrasive in the 50–200 µm particle size range. Without an effective wiper, particulate is dragged into the seal contact zone on rod retraction and progressively scores both the chrome rod surface and the seal lip — the failure mode that causes the characteristic slow weeping leak at the rod gland.

The cylinder barrel is hard-chrome-lined internally if required for maximum service life, or produced from precision-honed CFS seamless tube for standard-duty applications. End closures are welded or threaded depending on platform specification and pressure rating, with all welds subject to hydraulic proof testing before delivery.

Supply and Sourcing: Agricultural Lift Cylinder Availability for Dealers and Distributors

We supply this header lift cylinder in both single-unit quantities for direct farm replacement and in case-quantity lots for agricultural parts distributors and combine repair workshops. Lead times, minimum order quantities, and pricing are structured for the realities of the agricultural parts trade:

• Sample orders (1–5 pcs): Available for dealer qualification and machine fitment verification. Technical drawings and material certifications supplied on request.
• Stock orders (10–50 pcs): Preferred lead time 15–25 working days ex-works. Sea freight documentation prepared for standard HS code classification.
• Annual blanket orders: Available for distributors requiring seasonal pre-positioning of harvest-ready parts inventory. Pricing structured on total annual volume with quarterly release scheduling.

We can also cross-reference this cylinder against your existing OEM part numbers to confirm dimensional compatibility before you commit to stock.

Complete Technical Specifications