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![\"HH-YG45_220](\"https:\/\/ever-powers.com\/wp-content\/uploads\/2026\/08\/HH-YG45_220-Combine-Cylinders.webp\" "\\"\\"")
<\/div>\nModel: HH-YG45-220<\/p>\n
HH-YG45-220 Combine Cylinder<\/h2>\n
The HH-YG45-220 is a core-platform combine cylinder<\/strong> in the HH-YG45 series, delivering controlled hydraulic actuation across header positioning and frame adjustment functions on mid-range combine harvesters. With a 55 mm bore, 45 mm rod, and 220 mm stroke, this variant carries a heavier rod specification than its sibling the V90, making it the preferred choice for applications where the cylinder operates under sustained compressive load or where lateral forces are a design concern.<\/p>\n <\/p>\n Key Specifications<\/p>\n <\/p>\n The HH-YG45 series represents one of the most widely deployed cylinder families across Chinese-manufactured combine harvesters and their export derivatives. The YG45 designation identifies the mounting and port interface standard; the 220 refers to the 220 mm stroke; and the absence of the V90 suffix (as found on the companion model HH-YG45_220-V90) indicates a different end-cap geometry and pin bore configuration suited to a distinct bracket arrangement.<\/p>\n The most significant engineering distinction between the HH-YG45_220 and the V90 variant is the rod diameter: 45 mm versus 40 mm on the same 55 mm bore. This 5 mm increase may appear minor, but its mechanical consequences are substantial. The cross-sectional area of the 45 mm rod is 15.9 cm\u00b2 \u2014 26% larger than the 40 mm rod’s 12.6 cm\u00b2. This additional material provides meaningfully greater Euler buckling resistance across the 220 mm stroke, which is the governing failure mode for piston rods in compressive applications. It also increases the rod’s stiffness against lateral bending, reducing seal wear in installations where the cylinder does not operate in perfect axial alignment with its load path.<\/p>\n In practical combine operation, the mounting geometry of some header bracket designs imposes a small angular misalignment between the cylinder axis and the load vector, particularly when the header pivots relative to the machine frame on uneven ground. The thicker 45 mm rod on the HH-YG45_220 tolerates this misalignment with lower rod seal side-load stress than a thinner rod would experience under the same operating conditions.<\/p>\n The closed length of 380 mm \u2014 5 mm shorter than the V90 at 385 mm \u2014 reflects the different bracket geometry this cylinder mounts into. Both cylinders share the same 55\/220 bore-stroke combination, but the different closed lengths and end-cap configurations mean they serve distinct machine positions and cannot be substituted for one another without bracket modification.<\/p>\n <\/p>\n The HH-YG45_220 is engineered for bracket geometries where sustained compressive load and lateral force tolerance are priority requirements.<\/p>\n<\/div>\n <\/p>\n A question that frequently arises when sourcing HH-YG45 series parts is whether the two variants \u2014 the standard HH-YG45_220 and the V90 \u2014 can be interchanged. The answer is no, for three reasons:<\/p>\n When ordering a replacement, confirm the model number from the cylinder barrel stamp or the machine’s hydraulic parts diagram before purchasing. If the original number is worn or absent, dimensional measurement of the existing cylinder \u2014 bore, rod, stroke, closed length \u2014 plus a photograph of the end-cap port location allows accurate cross-referencing to the correct variant.<\/p>\n <\/p>\n The HH-YG45_220 barrel is produced from CFS seamless steel tube, drawn to dimensional tolerances of h9 on outer diameter and honed to an internal bore tolerance of H8 with surface roughness Ra \u2264 0.4 \u00b5m. This tolerancing ensures that the piston assembly \u2014 comprising piston body, wear rings, and PU seal \u2014 achieves the designed running clearance without machining adjustment during assembly.<\/p>\n The 45 mm piston rod is cold-drawn steel, centreless ground to h6 tolerance before chrome plating. After chrome deposition (minimum 25 \u00b5m thickness, 900\u20131050 HV hardness), the rod is polished to a final surface finish of Ra \u2264 0.2 \u00b5m at the seal contact zone. This finish level is critical: a rougher rod surface micro-abrades the primary seal lip at each extension-retraction cycle, generating seal debris that contaminates the hydraulic fluid and accelerates further seal wear in a self-reinforcing degradation cycle.<\/p>\n The gland assembly uses a triple-element rod seal arrangement: a primary PU lip seal, a secondary back-up seal, and an external dust wiper. The three-element arrangement provides defence-in-depth: if the primary seal develops a minor extrusion flaw from a debris ingestion event, the secondary seal maintains system pressure while the dust wiper prevents further contamination ingress. This redundancy is particularly relevant for combines operating in dusty harvest conditions where a single-seal gland would require more frequent maintenance intervention.<\/p>\n All assembled cylinders undergo hydrostatic pressure testing at 1.5\u00d7 rated working pressure before shipment, with a hold-and-check procedure that identifies both gross seal failures and slow internal leakage across the piston assembly. Test records are available on request for quality management system compliance.<\/p>\n <\/p>\n The HH-YG45 series \u2014 including both the standard HH-YG45_220 and the V90 variant \u2014 is a high-turnover part number in agricultural aftermarket supply chains serving Southeast Asian, South Asian, Eastern European, and South American combine operators. Distributors stocking this line typically maintain 20\u201350 pcs per variant as baseline harvest-season inventory, with replenishment triggered at 30% stock level to account for 4\u20136 week sea freight transit times.<\/p>\n We can work with distributors to build annual supply agreements that lock pricing against raw material fluctuations for the duration of the harvest season planning cycle \u2014 typically a 6\u201312 month forward commitment.<\/p>\n <\/p>\n
\nRod Diameter<\/span>45 mm<\/span>
\nStroke<\/span>220 mm<\/span>
\nMounting Length<\/span>380 mm<\/span><\/div>\n<\/div>\n<\/div>\n<\/div>\nHH-YG45 220 Combine Cylinder: Platform Role and Structural Design Philosophy<\/h2>\n
![\"Combine](\"https:\/\/ever-powers.com\/wp-content\/uploads\/2026\/08\/Reaper-harvester.webp\" "\\"\\"")
<\/p>\nCombine Harvester Hydraulic Cylinder OEM Replacement: Choosing Between the YG45-220 and YG45-220-V90<\/h2>\n
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Technical Build Quality: Barrel, Rod, and Seal Specifications for Field-Grade Durability<\/h2>\n
Supply Terms: HH-YG45 Series Cylinder Procurement for Export Distributors<\/h2>\n
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Complete Technical Specifications<\/h2>\n