Combine harvesters consist not only of metal parts. Rubber parts, plastic parts, seals, flexible components, and other non-metallic parts play a vital role in dust protection, sealing, vibration damping, crop and material conveying, machine protection, friction reduction, and operator comfort. Maikeyier supplies premium Combine Harvester Rubber Plastic Parts to agricultural machinery importers, dealers, wholesalers, and repair shops worldwide, compatible with Kubota, Yanmar, FM World, Lovol, and other brands.
What Are Combine Harvester Rubber Plastic Parts?
Combine Harvester Rubber Plastic Parts include rubber components made from natural or synthetic rubber; seals that prevent leakage of oil, water, and contaminants; plastic and nylon parts manufactured from engineering plastics; and exterior trim components. Unlike structural metal parts, these components are specially designed to work together to ensure smooth and efficient harvester operation, providing elastic deformation, sealing, cushioning, and resistance to environmental degradation.
- Rubber parts: Tracks, belts, vibration dampers, rubber curtains, rubber guards, and bushings.
- Seals: Oil seals, O-rings, gaskets, and seal repair kits.
- Plastic and nylon parts: Bushings, guides, rollers, wear pads, gears, and pulleys.
- Flexible and exterior parts: Canvas covers, rubber curtains, flaps, dust covers, edge trims/seals, and protective pads.
Classification of CombineHarvester Rubber Plastic Parts
Combine Harvester Track and Belt Components
Track and belt systems are among the most demanding applications for rubber parts on a combine harvester. They typically operate in wet, muddy, or dusty field conditions, transmitting power, providing traction, and withstanding continuous wear.
Rubber Tracks
- Abrasion resistance – withstands thousands of hours of friction against soil, straw, and gravel.
- Strong traction – maintains grip in muddy and sloping terrain.
- Flexibility – bends repeatedly around drive sprockets and idlers without cracking.
- Long service life – reinforced with steel cord or aramid fibers for tensile strength and durability.
Track Pads and Track Components
- Rubber track pads – replaceable weight-reducing pads that lower ground pressure and improve flotation.
- Track guides – keep the track properly aligned on the wheel frame to prevent derailment.
- Track carrier rollers and guide wheels – support the track system and maintain proper tension.
Combine Harvester Belts
| Belt Type | Function |
| V-Belt | General power transmission between pulleys |
| Drive Belt | Transmits engine power to working components |
| Timing Belt | Precisely synchronizes rotating parts |
| Banded Belt | Multiple V-belts joined together for heavy-duty transmission |
| Feeder Belt | Conveys cut crop from the header into the machine |
| Header Belt | Drives the reel and cutting mechanism on the header |
Oil Seals and O-Rings
Seals are among the most frequently replaced components on a combine harvester. Every rotating shaft, hydraulic fitting, and gearbox housing relies on effective sealing to prevent leakage and keep contaminants out.
Oil Seals
Oil seals (also called shaft seals or rotary shaft seals) are rubber-metal composite components installed between a rotating shaft and its housing to prevent oil leakage and block contaminants.
O-Rings
O-rings are the most basic and widely used sealing elements in hydraulic and pneumatic systems. They are installed at fitting connections on harvester components to provide sealing.
Seal Repair Kits
Combine harvester seal repair kits are pre-assembled kits containing oil seals, O-rings, hydraulic seals (piston seals, rod seals), dust seals, and other sealing components.
Combine Harvester Nylon and Plastic Parts
Engineering plastics and nylon components can replace traditional metal parts in applications requiring weight reduction, corrosion resistance, and low friction.
Nylon Parts
Includes: nylon guides, nylon bushings, nylon rollers, nylon pulleys, nylon gears.
- Lightweight – up to 70% lighter than equivalent steel parts.
- Wear-resistant – performs well in abrasive environments with grain and chaff.
- Low friction – self-lubricating properties reduce the need for greasing points.
- Corrosion-resistant – unaffected by water, fertilizers, and most chemicals.
Plastic Bushings
Plastic bushings replace metal bushings at pivot points, linkages, and rotating joints.
- Reduce friction between moving parts.
- Absorb vibration and shock loads.
- Ensure smooth linear or rotary motion.
- Eliminate metal-to-metal contact and the resulting wear.
Plastic Guides and Rollers
Common products include: guide rollers, nylon guides, plastic guides, slide wear pads, etc.
- Feeding system – guides crop into the threshing chamber.
- Header assembly – supports conveyor chains and belts.
- Conveying sections – directs grain and straw movement.
- Adjustment mechanisms – enables smooth position adjustments with minimal force.
Canvas Parts and External Rubber Components
Exterior parts on a combine harvester are important protective components that enhance machine visibility, protect the machine, and safeguard personnel.
Canvas Parts
Canvas parts are heavy-duty textile components used for protection, dust collection, covering, and flexible connections.
- Covers for grain tanks and hoppers.
- Dust covers for threshing and cleaning areas.
- Flexible connections between machine sections.
- Conveyor shrouds and splash guards.
Rubber Curtains and Rubber Flaps
Rubber curtains and flaps are flexible barriers installed at openings, transition areas, and discharge outlets.
- Prevent dust and chaff from escaping the machine.
- Prevent grain and straw from scattering during transport.
- Protect operators and surrounding personnel from debris.
- Seal openings against weather and contaminants.
External Rubber Components
Various small rubber parts protect the internal and external parts of the harvester.
- Rubber covers – protect sensors, wiring, and control elements.
- Rubber caps – seal shaft ends and tube openings.
- Rubber plugs – close holes and access ports.
- Rubber mats – anti-slip flooring on platforms and steps.
- Rubber strips/edge trims – protect panel edges and seal gaps.
Applications of Combine Harvester Rubber Plastic Parts
Combine Harvester Rubber Plastic Parts are found throughout the harvester, working together with machined parts, hydraulic parts, electrical parts, engine components, and hardware.
Header System
- Header belts (drive belts, reel belts)
- Rubber guards and crop dividers
- Plastic/nylon wear pads on the cutter bar
- Rubber grain flaps and curtains
- Plastic rollers and guides on the reel
- Dust seals and rubber grommets
Feeder House / Conveyor
- Feeder belts and conveyor belts
- Nylon/plastic chain guides
- Rubber seals at feeder house transitions
- Wear pads and slides
- Plastic rollers and idler assemblies
- Rubber flaps at crop inlets
Threshing & Separation System
- V-belts and banded belts for threshing drive
- Rubber seals around drums and concaves
- Nylon bushings and bearings in inspection panels
- Rubber vibration dampers
- Wear-resistant PU (polyurethane) liners and scrapers
- Dust seals and rubber gaskets
Cleaning System
- Fan drive belts
- Rubber vibration dampers and bumpers
- Plastic bushings in sieve adjustment linkages
- Rubber seals and gaskets around clean grain elevators
- Dust covers and rubber flaps
Grain Tank & Elevator
- Elevator conveyor belts
- Canvas or rubber grain tank covers
- Rubber seals around grain tank and unloading auger
- Nylon/plastic guides inside elevator housings
- Rubber plugs and access port covers
Chassis & Undercarriage
- Rubber tracks and track pads
- Track guides and rubber bumpers
- Oil seals for carrier rollers and guide wheels
- Nylon/plastic bushings in track tensioning mechanisms
- Rubber limit stops and cushion blocks
Engine & Powertrain
- Engine drive belts (fan belt, alternator belt)
- Oil seals for crankshaft, camshaft, and gearbox
- O-rings and gaskets in cooling and fuel systems
- Rubber engine mounts and vibration dampers
- Timing belts
Hydraulic System
- Hydraulic O-rings and back-up rings
- Piston seals and rod seals
- Oil seals for hydraulic pumps and motors
- Seal repair kits for steering, header lift, and reel lift cylinders
- Wiper/scraper seals
Operator Cabin & Exterior
- Rubber floor mats and anti-vibration pads
- Cab door seals and window weather strips
- Canvas covers and protective tarpaulins
- Rubber caps, plugs, and grommets
- Exterior rubber strips and edge trims
Functions of Combine Harvester Rubber Plastic Parts
Sealing: Prevents leakage of oil, grease, fuel, and coolant while blocking dust, water, and debris from entering critical housings.
Vibration damping: Isolates vibration from the engine, threshing drum, and cleaning sieves, protecting machine structure and operators.
Wear protection: Reduces direct metal-to-metal contact, extends the life of moving parts, and lowers repair frequency.
Dust protection: Canvas covers, rubber curtains, and dust seals prevent dust, chaff, and straw particles from contaminating electrical systems, hydraulic valves, and the operator station.
Noise reduction: Provides sound insulation effects. Vibration dampers, rubber pads, and flexible couplings all contribute to a quieter working environment.
Lightweight design: Engineering plastics such as nylon and polyethylene are much lighter than steel. Replacing metal parts with plastic components can reduce overall machine weight, lower fuel consumption, and reduce soil compaction.
Common Materials Used for Combine Harvester Rubber Plastic Parts
| Material | Properties | Applications |
| Nitrile Rubber (NBR) | Excellent oil and fuel resistance | Oil seals, hydraulic seals, fuel hose assemblies |
| EPDM | Outstanding weather, ozone, and heat resistance | External rubber seals, radiator hoses, weather strips |
| Polyurethane (PU) | Superior wear resistance | Wear pads, scrapers, high-stress rubber parts |
| Nylon/PA | Low friction, good strength and toughness | Bushings, guides, gears, rollers |
| UHMW-PE | Extremely low friction, high impact and wear resistance | Wear pads, slide plates, guide liners |
| PVC | Flexible, economical, easy to process | Covers, curtains, protective sheets |
| Natural Rubber (NR) | High elasticity, good vibration damping | Vibration dampers, rubber tracks, suspension bushings |
Factors Affecting the Price of Combine Harvester Rubber Plastic Parts
| Cost Factor | Impact | Example |
| Material selection | Raw material costs vary significantly, with different materials costing several times more | UHMW-PE wear pad > PVC cover; NBR oil seal > natural rubber gasket |
| Part size | Larger parts require more raw material and may require larger molds or extrusion dies | Rubber tracks and wide conveyor belts are the highest-priced rubber products |
| Hardness requirements | Rubber hardness is measured in Shore A; specific hardness values require custom compounding formulations | Different parts require different hardness levels (e.g., seals vs. vibration dampers) |
| Temperature resistance | Parts for high-temperature environments require specialty rubber, much more expensive than standard rubber | Silicone, FKM (fluoroelastomer) for near-engine/exhaust areas; NBR/EPDM for general areas |
| Oil resistance | Oil seals and hydraulic components must resist petroleum-based fluids, requiring specific materials | NBR, FKM oil seals and hydraulic seals |
| Tooling cost | Compression/injection molding requires custom molds; cost is amortized over each batch | Tooling is a one-time investment; larger batches reduce per-unit cost |
| Manufacturing process | Different processes have different cost structures for tooling, labor, and material waste | See detailed table below |
| Order quantity | Larger batches reduce setup time, improve material utilization, and optimize scheduling | Bulk procurement can significantly reduce per-unit cost |
| Packaging and shipping | Large-volume products require more packaging materials and shipping space | Rubber tracks, wide belts, canvas covers, and other large items |
How to Choose the Right Rubber or Plastic Part
| Step | Core Focus | Description |
| Step 1 | Confirm machine brand and model | Start with the harvester brand and model. Common brands include Kubota, Yanmar, Lovol, World, etc. Different models use different specifications; precise matching is the first step |
| Step 2 | Confirm part type | Determine the specific part to be replaced – e.g., oil seal, O-ring, drive belt, nylon guide, rubber curtain, or track pad. Clarifying the part type helps with accurate dimensional and material confirmation |
| Step 3 | Verify dimensions | Measure or confirm key dimensions: ID, OD, thickness/width, length. For seals, also confirm shaft diameter and housing bore; for belts, confirm cross-section profile and length. Dimensional deviations cause installation failure |
| Step 4 | Confirm material requirements | Consider the working environment: Will the part contact oil, water, fertilizers, grain, or abrasive materials? What is the operating temperature range? Determine whether NBR, EPDM, PU, nylon, or UHMW-PE is more suitable. Material selection directly affects service life |
| Step 5 | Assess working environment | Evaluate the actual conditions the part will face: oil or chemical exposure, water or mud immersion, high or low temperature, dust and abrasive particles, continuous friction or impact loads. Harsher conditions demand higher material and construction requirements |
| Step 6 | Confirm OEM part number | Cross-reference the OEM part number whenever possible. This is the most reliable way to ensure correct matching. Most aftermarket suppliers, including Maikeyier, can match by OEM number, drawing, or sample |
How to Find a Reliable Combine Harvester Rubber Plastic Parts Supplier?
After understanding the products and how to correctly identify the rubber and plastic parts you need, selecting the right supplier is crucial for quality consistency and delivery reliability. When procuring harvester parts, we can evaluate suppliers based on raw material quality, dimensional accuracy, certifications, inspection standards, and more.
Material quality: Can the supplier provide material specifications and test reports? Do they use certified raw materials from reputable compound suppliers?
Dimensional accuracy: Is dimension consistent across production batches? Does the supplier use go/no-go gauges, CMM, or other precision measuring instruments?
Tooling capability: Can the supplier develop molds for non-standard or new parts in-house? In-house tooling design and manufacturing capability is strong proof of technical strength.
OEM compatibility: Can the supplier produce parts according to OEM part numbers, technical drawings, or physical samples?
Quality control: Does the supplier perform systematic quality checks?
- Dimensional inspection (first-off + in-process + final)
- Hardness testing (Shore A for rubber, Shore D for plastics)
- Material inspection and certification
- Visual inspection (surface defects, flash, mold marks)
Supply capability: Can the supplier provide a full range of rubber, plastic, and metal parts through a single channel? Suppliers that integrate multiple categories help buyers simplify procurement, consolidate shipments, and reduce supplier management costs.
Why Choose Maikeyier for Combine Harvester Rubber Plastic Parts?
Maikeyier is a one-stop agricultural parts supplier, covering complete machine parts for harvesters, tractors, and agricultural implements, serving importers, dealers, wholesalers, repair shops, and agricultural parts distributors worldwide. We are committed to helping customers simplify procurement, reduce supply chain complexity, and deliver reliable quality at competitive prices.
Supply Chain Integration
We integrate and supply a comprehensive range of non-metallic components as well as harvester hardware, machined parts, hydraulic parts, engine components, and more. We support custom orders based on drawings or samples.
- Rubber parts (tracks, belts, bushings, vibration dampers).
- Plastic parts (nylon guides, bushings, rollers, gears).
- Seals (oil seals, O-rings, seal repair kits).
- Canvas and textile products (covers, curtains, flexible connections).
Manufacturing Capability
We have our own forging factory, located in Wujin District, Changzhou City, Jiangsu Province, China, capable of producing forgings such as track guides, track rollers, guide wheels, swing arms, and tension wheels for Kubota, Yanmar, Lovol, and FM World brands.
- Molds: 200+
- Area: 6,000 m²
- Stock SKUs: 10,000+
Mixed Orders
We support combined purchasing of rubber parts, plastic parts, seals, and metal parts – customers can consolidate multiple categories into a single order and single shipment.
- Global Wholesale Supply
- Minimum order quantity for single items: 500 pieces
- Complete machine parts combination orders
- Brand combinations: Yanmar, Kubota, Lovol, FM World
Common Signs That Combine Harvester Rubber Plastic Parts Need Replacement
Cracks: Visible cracks on rubber surfaces indicate aging, ozone attack, or UV degradation.
Hardening: Rubber loses elasticity, becomes hard and brittle – sealing and vibration damping performance drops significantly.
Deformation: Swollen, warped, or permanently deformed seals and bushings are past their service life.
Oil leakage: Visible oil seepage around shaft ends, gearboxes, or hydraulic cylinders usually points to oil seal failure.
Excessive wear: Deep grooves, flat spots, or significantly reduced dimensions on nylon guides and plastic rollers require replacement.
Belt slipping: Belts that slip under load have lost tension or have worn V-profiles and must be replaced immediately.
Abnormal noise: Squealing, grinding, or clicking sounds from belt drives, track systems, or rotating shafts usually indicate worn rubber or plastic parts.
Loss of elasticity: Rubber curtains, flaps, and covers that cannot return to their original shape have lost their functional characteristics.
Frequently Asked Questions (FAQ)
Looking for a reliable Combine Harvester Rubber Plastic Parts supplier? Maikeyier provides a wide range of rubber parts, plastic parts, seals, and flexible components for combine harvesters to aftermarket dealers and agricultural parts wholesalers. Through factory manufacturing and one-stop supply solutions, we help customers simplify procurement processes. Contact us for a free quotation on harvester parts.