Combine Harvester Hydraulic Parts control key functions such as header lift, reel adjustment, grain unloading, and steering. Maikeyier currently manufactures and supplies complete machine parts, including headers, threshing systems, conveying systems, running chassis components, engines, and hydraulic parts, covering all series of harvesters across four major brands – Kubota, Yanmar, Lovol, and FMWorld. We provide high-quality, one-stop hydraulic parts supply services to the global agricultural aftermarket.
Popular Combine Harvester Hydraulic Parts
Combine Harvester Hydraulic Parts operate under high pressure and high frequency for extended periods. Aging cylinder seals, worn pumps, sticking valve blocks, and ruptured hoses are common problems during the harvest season. These require close attention and timely replacement during routine harvester parts maintenance and repair.
Hydraulic Pumps
Gear pump: Supplies pressurized oil to the system.
Piston pump: Suitable for large harvester hydraulic systems.
Hydraulic Cylinders
Header lift cylinder: Controls header lift and adjusts harvesting height.
Steering cylinder: Controls the harvester's steering direction.
Reel cylinder: Adjusts the reel's fore-aft position and height.
Unloading cylinder: Controls the extension, retraction, and lift of the unloading auger.
Hydraulic Valves
Multi-way directional control valve: Controls the sequence of multiple hydraulic actuators.
Relief valve (safety valve): Limits maximum system pressure to protect hydraulic components.
Check valve: Controls one-way oil flow.
Throttle valve: Regulates the speed of actuators.
Hydraulic Accessories
Hydraulic hoses: Piping for conveying hydraulic oil.
Hydraulic fittings: Interfaces connecting hoses to hydraulic components.
Hydraulic filter elements: Filter impurities from hydraulic oil to protect the system.
Hydraulic tank: Stores hydraulic oil, dissipates heat, and allows impurities to settle.
Seals
Cylinder seals: Prevent internal and external leakage from cylinders.
O-rings: Provide static sealing at various connection points.
Wiper seals: Prevent external contaminants from entering the cylinder.
Combine Harvester Hydraulic Parts Classification
By location and function, Maikeyier divides hydraulic system parts into four categories: hydraulic pumps, hydraulic cylinders, hydraulic valves, and hydraulic accessories. The functions and common failures of these components are listed below to help you quickly locate the products you need during procurement.
Hydraulic Pumps
Component | Function | Common Failures |
Gear pump | Simple structure, high reliability; widely used in harvester hydraulic systems | Gear wear causing pressure drop, increased internal leakage, abnormal noise |
Piston pump | High pressure, high flow; suitable for large harvesters | Piston wear, valve plate wear, pressure fluctuation |
Pump shaft | Connects engine PTO to the hydraulic pump | Journal wear, keyway damage |
Pump housing | Outer casing of the hydraulic pump, housing internal components | Cracks, deformation, porosity leakage |
Hydraulic Cylinders
Component | Function | Common Failures |
Header lift cylinder | Controls header lift to adapt to different crop heights | Piston rod bending, internal leakage, external leakage |
Steering cylinder | Controls the harvester’s steering direction | Heavy steering, pulling, seal failure |
Reel cylinder | Adjusts reel height and fore-aft position | Lift sticking, unstable positioning |
Unloading cylinder | Controls extension/retraction and lift of the unloading auger | Slow unloading, inability to hold position |
Cylinder assembly | Full set including barrel, piston, piston rod, seals, etc. | See individual components |
Piston rod | Power output end of the cylinder, bearing pushing and pulling forces | Plating wear, scoring, bending |
Cylinder barrel | Main body of the cylinder, in which the piston reciprocates | Internal wall wear, scoring, deformation |
Hydraulic Valves
Component | Function | Common Failures |
Multi-way directional control valve | Centrally controls multiple actuators | Spool sticking, internal leakage, heavy operation |
Relief valve (safety valve) | Limits maximum system pressure for protection | Pressure regulation failure, spring failure, seat wear |
Check valve | Allows oil flow in only one direction | Reverse leakage, spool sticking |
Throttle valve | Regulates actuator speed | Regulation failure, orifice clogging |
Solenoid directional valve | Controls oil circuit direction via electrical signal | Solenoid burnout, spool sticking |
Valve block assembly | Combination of multiple valves with integrated control functions | Comprehensive faults |
Hydraulic Accessories
Component | Function | Common Failures |
Hydraulic hose | High-pressure piping for conveying hydraulic oil | Aging cracks, joint leakage, bulging |
Hydraulic fitting | Interface connecting hoses to hydraulic components | Seal failure, thread damage |
Hydraulic filter element | Filters impurities from hydraulic oil | Clogging, reduced filtration accuracy |
Hydraulic tank | Stores hydraulic oil, dissipates heat, allows impurity settling | Oil leakage, breather clogging |
Cylinder seal | Prevents internal and external leakage from cylinders | Aging, wear, extrusion damage |
O-ring | Static sealing at connection points | Aging deformation, compression set |
Wiper seal | Prevents external contaminants from entering the cylinder | Wear, scoring |
Combine Harvester Hydraulic System Parts Supplier – Maikeyier
Maikeyier is a comprehensive supplier with a quality control system and an integrated supply chain. In the hydraulic system parts sector, we cover hydraulic components for all series of Kubota, Yanmar, Lovol, and FMWorld harvesters.
Our Hydraulic Parts Supply Scope
- Hydraulic pumps: Gear pumps, piston pumps, pump shafts, pump housings, etc.
- Hydraulic cylinders: Header lift cylinders, steering cylinders, reel cylinders, unloading cylinders, cylinder assemblies, piston rods, cylinder barrels, etc.
- Hydraulic valves: Multi-way directional control valves, relief valves (safety valves), check valves, throttle valves, solenoid directional valves, valve block assemblies, etc.
- Hydraulic accessories: Hydraulic hoses, hydraulic fittings, hydraulic filter elements, hydraulic tanks, etc.
- Seals: Cylinder seals, O-rings, wiper seals, etc.
Product Advantages
- Seals: Made of high-quality polyurethane/NBR material, oil-resistant, high-temperature-resistant, aging-resistant, with precise dimensions.
- Piston rods: Chrome-plated, with surface finish meeting standards, wear-resistant and corrosion-resistant.
- Hydraulic hoses: High-pressure steel wire braided construction, with securely crimped fittings and pressure-tested.
- Hydraulic valves: Precision-matched spool and body, sensitive operation, no internal leakage.
- Quality traceability: Every batch is traceable and comes with an inspection report.
Compatible Brands
Kubota: Full series of harvester hydraulic system parts.
Yanmar: Full series of harvester hydraulic system parts.
Lovol: Full series of harvester hydraulic system parts.
FMWorld (World): Full series of harvester hydraulic system parts.
Agricultural Machinery Forged Parts Factory – Maikeyier
Maikeyier’s Services
- One-stop procurement service: Full series of hydraulic parts, from pumps to seals, meeting all customer needs.
- Flexible procurement options: Supports small samples, mixed categories, and combined orders.
- Product documentation support: Product images, model compatibility tables, cross-reference part number catalogs, product manuals, etc.
- OEM customization services: Supports packaging design, label customization, and private labeling.
- Quality assurance services: 24/7 after-sales support; every batch comes with a factory inspection report.
- Fast delivery: Maikeyier warehouse maintains large stock; delivery lead time of 5-25 working days.
Frequently Asked Questions (FAQ)
A: Combine harvester hydraulic systems typically use 46# anti-wear hydraulic oil (ISO VG 46). In some regions or special working conditions, 68# hydraulic oil may be used. Leave us a message with your harvester brand, and our engineers can recommend the right oil.
A: Hydraulic oil is generally recommended to be changed every 500-600 hours or annually.
A: Hydraulic cylinder leakage is usually caused by: ① worn or aged seals (most common); ② damaged wiper seal allowing contaminants to score sealing surfaces; ③ scratched or peeled piston rod plating; ④ worn cylinder barrel internal wall. Solution: For minor external leakage, replace the cylinder seal kit. If the piston rod is severely scratched or the cylinder barrel wall is worn, replace the cylinder assembly or piston rod.
A: Common causes include: ① low hydraulic oil level causing pump cavitation; ② hydraulic oil viscosity too high or too low; ③ air leakage in the pump suction line; ④ internal pump wear (gears, pistons, valve plates); ⑤ safety valve vibration. If abnormal noise occurs, stop the machine immediately to prevent further pump damage.
A: This is usually caused by: ① excessively tight clearance or sticking between the spool and valve body; ② high hydraulic oil viscosity; ③ mechanical binding in the operating mechanism; ④ spool deformation. Try cleaning the spool and checking the hydraulic oil condition. If the problem persists, the valve block needs to be repaired or replaced.
A: A sudden pressure drop may be caused by: ① a broken relief valve spring or spool stuck in the open position; ② sudden pump failure (e.g., broken gear teeth); ③ burst hose or detached fitting; ④ severely low hydraulic oil level. If a sudden pressure drop occurs, stop the machine immediately and check the relief valve, pump, and lines.
A: OEM hydraulic parts are produced by the OEM or its designated suppliers, strictly following original standards, and are priced higher. Aftermarket hydraulic parts are produced by independent manufacturers according to original specifications and are generally more cost-effective.
A: Maikeyier’s hydraulic system parts cover all series of Kubota, Yanmar, Lovol, and FMWorld harvesters, including hydraulic pumps, cylinders, valves, hoses, seals, and more for each model. For special model requirements, please contact us for compatibility confirmation.
A: Hydraulic parts support mixed-lot orders; different categories can be combined with flexible MOQ. Small items such as seals and fittings support small-batch orders. Large items such as cylinders and pumps can be customized to your required quantity. Specific MOQs vary by product type and model. Please contact us for a detailed quotation.
Whether you need hydraulic pumps, cylinders, valves, hoses, or seals, Maikeyier can provide you with high-quality, cost-effective hydraulic system parts solutions. Please contact us for a complete hydraulic parts catalog and targeted quotation.