{"id":1881,"date":"2026-07-20T05:44:01","date_gmt":"2026-07-20T05:44:01","guid":{"rendered":"https:\/\/gearrack.top\/?p=1881"},"modified":"2026-07-20T05:44:01","modified_gmt":"2026-07-20T05:44:01","slug":"spur-gears-for-agricultural-machinery","status":"publish","type":"post","link":"https:\/\/gearrack.top\/ko\/spur-gears-for-agricultural-machinery\/","title":{"rendered":"Spur Gears for Agricultural Machinery"},"content":{"rendered":"
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GEAR APPLICATION GUIDE \u00b7 SPUR GEAR \u00b7 S04<\/span><\/p>\n

Spur Gears for Agricultural Machinery:
\nTractor Transmission, Gearbox and Field Drive Specifications<\/span><\/h1>\n

Agricultural machinery spur gears must combine high shock load capacity with resistance to contamination, wide operating temperature ranges, and cost-effective replaceability across seasonal maintenance cycles. From tractor main gearboxes and differential drives to combine harvester straw chopper transmissions and seeder metering units, spur gears handle the majority of mechanical power distribution across all agricultural equipment categories. This guide covers material selection, module sizing, duty factors, and application-specific specifications for agricultural spur gear drives.<\/p>\n

20CrMnTi \u00b7 C45 \u00b7 SCM420H \u00b7 42CrMo4<\/span>
\nM3\u2013M14 \u00b7 Shock SF 1.5\u20133.0 \u00b7 DIN 6\u20139<\/span>
\nTractor \u00b7 Combine \u00b7 Seeder \u00b7 Harvester<\/span><\/div>\n<\/div>\n<\/div>\n
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MODULE RANGE<\/p>\n

M3 \u2013 M14<\/p>\n

Agricultural spur gear module range. Seeder drives: M3\u2013M5. Light implement gearboxes: M4\u2013M6. Tractor main gearbox: M6\u2013M10. Large tractor rear axle \/ combine straw chopper: M10\u2013M14<\/p>\n<\/div>\n

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SHOCK SERVICE FACTOR<\/p>\n

1.5 \u2013 3.0<\/p>\n

Agricultural duty service factors \u2014 significantly higher than industrial conveyor or machine tool drives. Impact loads from rock strikes, crop plugging events, and ground surface variations demand conservative design margins<\/p>\n<\/div>\n

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ANNUAL DUTY<\/p>\n

200\u20131,000 h<\/p>\n

Per year for most agricultural equipment. Low annual hours vs industrial drives, but with concentrated seasonal peak loading and limited mid-season maintenance. Tractor main gearbox: up to 1,000 h\/yr on large arable farms<\/p>\n<\/div>\n

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PREFERRED MATERIAL<\/p>\n

20CrMnTi<\/p>\n

Case carburized & hardened, HRC 58\u201362, for heavy-duty tractor and combine spur gears. C45 induction hardened for light and medium seasonal implement gears. SCM420H for European and North American OEM programmes<\/p>\n<\/div>\n<\/div>\n

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Spur Gears in Agricultural Power Transmission<\/h2>\n

Spur gears form the backbone of agricultural power transmission from tractor engine to field operation. Unlike industrial applications where a single gear train routes power from motor to one driven load at constant speed, agricultural equipment must distribute engine power simultaneously to multiple output shafts at different speeds and torques: the tractor main gearbox splits engine power between the rear wheel final drives and the PTO shaft; the combine harvester main gearbox distributes threshing drum power, straw chopper drive, grain elevator drive, and header drive all from a single engine input; the seed drill metering unit uses a long spur gear chain to maintain precise seed rate proportional to ground speed across the full working width of the machine.<\/p>\n

Korea Ever-Power’s spur gears for agricultural machinery<\/a> cover the full range from small M3 seeder metering gears in C45 normalised steel through to large M12 tractor rear axle crown gears in 20CrMnTi case carburized \u2014 manufactured to the OEM drawing or reverse-engineered from the original gear for replacement supply. Agricultural OEM programmes from Korea Ever-Power serve European, North American, and Asian agricultural equipment manufacturers with annual volumes from 500 to 500,000 pieces per SKU, all ISO 9001:2015 certified.<\/p>\n

The critical design difference between agricultural and industrial spur gears is the approach to service factor selection. Agricultural implements operate on unpredictable terrain with the possibility of sudden severe overload \u2014 a combine harvester entering a heavily laid crop can load the straw chopper spur gears to 4\u20136\u00d7 rated torque in a fraction of a second. Agricultural spur gears must either be designed with a service factor that accounts for this worst-case shock (conservative approach: large modules, wide face widths, case carburized high-strength material) or protected upstream by a slip clutch or shear bolt limiting device (allows lighter gears with lower service factor, lower cost, faster seasonal replacement when the limiting device activates).<\/p>\n

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Tractor Main Gearbox Spur Gears<\/h3>\n

Tractor main gearbox (transmission) spur gears are the highest-loaded agricultural spur gear application \u2014 transmitting peak engine torque through all road and field gears across the full tractor operating lifetime of 10,000\u201320,000 hours. Modern agricultural tractor gearboxes use helical gears for the primary ratio stages and spur gears for the range gears (high\/medium\/low range selection), the four-wheel-drive engagement gear, and the PTO speed-change gears. All tractor main gearbox spur gears are 20CrMnTi or SCM420H case carburized to HRC 58\u201362, DIN 7\u20138 quality class, with shot-peened tooth roots to improve bending fatigue resistance.<\/p>\n<\/div>\n

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Combine Harvester Spur Gear Drives<\/h3>\n

The combine harvester uses spur gears throughout the threshing, separation, and cleaning sections of the machine. The threshing drum variator output spur gear train, straw walker crankshaft drive, straw chopper rotor gear, and grain auger chain-and-spur gear drives all represent different duty requirements \u2014 from the slow, high-torque straw chopper spur gears (M10\u2013M14, 20CrMnTi, high shock loading from crop ingestion) to the smaller, faster grain elevator spur gears (M4\u2013M6, C45 or 20CrMnTi, continuous smooth duty). Korea Ever-Power supplies matched combine spur gear sets cross-referenced to all major combine brands for in-season breakdown replacement.<\/p>\n<\/div>\n

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Seeder and Precision Drill Drives<\/h3>\n

Precision seed drills and air seeders use spur gear trains to maintain precise seed metering rate proportional to ground speed \u2014 the gear train between the land wheel and the seed metering rollers must deliver an exact seed rate at all seeding speeds without slippage or rate variation. Seeder spur gears are small (M3\u2013M5), low-torque, and operate for limited hours per year \u2014 C45 normalised or induction hardened is the standard material, with replaceable gear clusters allowing the operator to adjust seed rate by swapping in different ratio gear sets at the start of each crop. Korea Ever-Power supplies interchangeable seed rate gear sets for all common precision drill and air seeder models, including plastic alternatives where corrosion resistance is required.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

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Agricultural Machinery Spur Gear Specifications by Application<\/h2>\n
\"tractor
Korea Ever-Power 20CrMnTi case carburized spur gears for agricultural tractor transmission application \u2014 M8, 42 teeth, bore 55 mm H7, keyway 16 \u00d7 10, HRC 60\u201362 tooth surface, case depth 1.0\u20131.4 mm, DIN 8 quality class. Shot-peened tooth root fillet to improve bending fatigue life by 15\u201320% under shock loading. Traceability stamp on gear web for warranty tracking. OEM supply to European tractor manufacturers \u2014 annual volume 15,000 pieces per part number. Replacement supply for John Deere, Case IH, New Holland, Fendt, CLAAS, and Massey Ferguson tractor models with lead time 12\u201320 days from order confirmation.<\/figcaption><\/figure>\n
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APPLICATION<\/th>\nMODULE<\/th>\nMATERIAL<\/th>\nDIN CLASS<\/th>\nSHOCK SF<\/th>\n<\/tr>\n<\/thead>\n
Tractor main gearbox (range gears)<\/td>\nM6\u2013M10<\/td>\n20CrMnTi \/ SCM420H<\/td>\nDIN 7\u20138<\/td>\n1.5\u20132.0<\/td>\n<\/tr>\n
Tractor PTO speed-change gears<\/td>\nM5\u2013M8<\/td>\n20CrMnTi<\/td>\nDIN 8<\/td>\n1.5<\/td>\n<\/tr>\n
Combine straw chopper rotor drive<\/td>\nM10\u2013M14<\/td>\n20CrMnTi<\/td>\nDIN 8\u20139<\/td>\n2.5\u20133.0<\/td>\n<\/tr>\n
Combine grain elevator & auger<\/td>\nM4\u2013M6<\/td>\nC45 \/ 20CrMnTi<\/td>\nDIN 8\u20139<\/td>\n1.5<\/td>\n<\/tr>\n
Rotary tiller & cultivator drive<\/td>\nM5\u2013M8<\/td>\nC45 IH \/ 20CrMnTi<\/td>\nDIN 8\u20139<\/td>\n2.5\u20133.0<\/td>\n<\/tr>\n
Seed drill ground wheel metering<\/td>\nM3\u2013M5<\/td>\nC45 \/ POM plastic<\/td>\nDIN 9<\/td>\n1.0\u20131.25<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/section>\n
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Material Upgrade: C45 to 20CrMnTi \u2014 When It Is Worth It<\/h2>\n
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WHEN C45 IS CORRECT<\/h3>\n