Agricultural Gearbox · UK Supplier · Est. OEM Partner
Czyszczenie przekładni Star w kombajnach do zbioru buraków:
Precision Root Crop Separation Built for British Fields
When the sugar beet campaign runs flat out across Lincolnshire, Norfolk, and the East Riding, the cleaning star gearbox inside your harvester carries a load that almost no other drivetrain component can match. Ever Power engineers and manufactures these gearboxes with one objective in mind: zero unplanned downtime during the six-week harvest window.
Why the Cleaning Star Gearbox Is the Hardest-Working Component in a Beet Harvester
The British sugar beet industry harvests roughly seven to eight million tonnes of root crop each year, and virtually every tonne passes through a cleaning star system before it leaves the field. These rotating star-shaped elements work in coordinated pairs or multiples, tumbling and agitating the beet stream to knock off adhering clay, stones, and green top material. The gearbox at the centre of this mechanism transfers drive from a PTO shaft or hydraulic motor through bevel gears to multiple output shafts, each spinning a cleaning star at precisely the speed the machine’s design requires. Any deviation — vibration, backlash, overheating — shows up immediately as either damaged beet crowns or poorly cleaned product arriving at the transport vehicle, both of which cost the contractor real money at the factory intake.
Ever Power has supplied cleaning star gearboxes to harvester OEMs and the UK replacement market for well over fifteen years. The engineering team has accumulated field data from machines operating in heavy Fenland silts, Yorkshire clay, Nottinghamshire loam, and sandy Suffolk soils — conditions that create very different loading profiles and demand different lubrication strategies, gear face hardness, and seal specifications. That real-world knowledge is baked directly into every unit we manufacture, rather than being approximated from a generic catalogue.
The pages that follow cover how the gearbox works mechanically, what materials and engineering choices separate a reliable unit from one that fails mid-campaign, which harvesters and scenarios the product serves across the UK, and why pairing the gearbox with a correctly specified PTO shaft from the same supplier is the single most effective reliability investment a UK contractor or dealer can make.
Ever Power Cleaning Star Gearbox — OEM-compatible and custom-built units for UK sugar beet and fodder beet harvesters
Jak działa przekładnia gwiazdy czyszczącej w kombajnie do buraków
After the six-row or eight-row lifting shares pull beet from the ground, the root crop moves into the harvester body via an elevator. Before it reaches the bunker, it has to pass through a cleaning section that is, in mechanical terms, a carefully choreographed sequence of shaking and rolling actions. Each cleaning star is a multi-pointed cast iron or ductile iron rotor mounted on a shaft. Two counter-rotating stars mesh loosely together, squeezing and tumbling the beet between them while flicking soil and debris outward through gaps in the star profile. The effectiveness of this action depends entirely on the stars turning at the right speed, in phase, and without vibration — which is where the gearbox becomes critical.
The cleaning star gearbox sits between the machine’s power source and these star shafts. Its job is to convert rotational power — typically 540 RPM from a tractor PTO or a fixed-speed hydraulic motor — into the lower, precisely controlled speed required by the stars, usually in the range of 150 to 280 RPM depending on the harvester design. This ratio reduction is achieved through a helical or spiral bevel gear set, which also changes the direction of rotation by 90 degrees, allowing horizontal drive to feed vertical or transverse shaft outputs without additional angle drives further along the drivetrain.
The loads are far from constant. As beet volume fluctuates and occasional stone ingestion occurs, peak torque spikes can reach three to four times the nominal load in a fraction of a second. This is precisely why Ever Power engineers size the cleaning star gearbox with a substantial service factor and select bearings based on actual field-measured L10 fatigue data rather than theoretical catalogue values alone. The result is a unit that absorbs shock loading without developing the backlash or bearing wear that leads to expensive mid-campaign failures in lesser designs.
Technical Specifications — Ever Power Cleaning Star Gearbox
Standard range parameters. Custom configurations available on request — contact [email protected]
| Parametr | Specyfikacja | Field Notes |
|---|---|---|
| Typ przekładni | Spiral bevel / helical bevel | Low-noise, high-efficiency power transfer at 90 degrees |
| Zakres przełożeń | 1:1.5 to 1:6 | Custom ratios available; specify harvester model and star RPM target |
| Prędkość wejściowa | 540 RPM / 1,000 RPM PTO compatible | Hydraulic motor input versions also available |
| Nominalny moment wyjściowy | Up to 2,800 Nm per output shaft | Peak shock factor 2.5x above nominal — stone ingestion rated |
| Materiał obudowy | GGG50 nodular ductile iron | 500 h salt-spray tested; epoxy primer coat as standard |
| Materiał przekładni | 20CrMnTi / 20CrMo carburised alloy steel | Case depth 0.8–1.2 mm; tooth face hardness HRC 58–62 |
| Gear Tooth Accuracy | ISO Grade 5 (ground after heat treatment) | Ensures smooth meshing under variable beet loading |
| Typ łożyska | Tapered roller — Timken / SKF equivalent | Pre-adjusted, shimmed on dedicated test rig for correct preload |
| System uszczelniający | Triple-stage: FKM lip + spring-loaded contact seal + labyrinth | Effective in wet, clay-laden beet harvesting conditions |
| Smarowanie | Oil bath — SAE 80W-90 GL-4 (synthetic-blend option available) | Fill, drain, and level plugs on all four faces |
| Temperatura pracy | -25 degrees C to +90 degrees C | FKM seals maintain lip contact at pre-dawn October starts in the UK |
| Output Configurations | Single, dual, or quad output shafts | Matches 2-, 4-, or 6-star cleaning section designs |
| Stopień ochrony | IP65 equivalent | Pressure-wash rated; tested to agricultural duty cycle |
Materials, Engineering Detail, and Construction Philosophy
Each component inside an Ever Power cleaning star gearbox is selected and manufactured to address a specific failure mode that the engineering team has recorded from units returned from UK and European beet campaigns. The following four areas account for the majority of gearbox failures on competitive units — and the design choices described below explain why Ever Power units consistently outlast them in field service.
🔧 Gear Set
The spiral bevel gear pairs are machined from 20CrMnTi alloy steel billets, case-carburised to a depth of 0.8 to 1.2 mm, and hardened to HRC 58 to 62 at the tooth face. Every gear tooth is then ground post heat-treatment to ISO Grade 5 accuracy. The combination of hard case and tough core means the teeth resist both pitting fatigue and the sudden impact bending that occurs when a soil clod or stone passes through the cleaning section. Under a competitor’s softer gear, that same event leaves micro-cracks at the tooth root that propagate to fracture within one or two further seasons. The grinding step after heat treatment — which many lower-cost manufacturers omit — eliminates the distortion introduced by the hardening process and produces a true involute profile that meshes smoothly at all load levels.
🏠 Housing
GGG50 nodular cast iron provides the combination of tensile strength and vibration-damping capacity that aluminium housings cannot match in high-shock agricultural service. Aluminium is lighter, but it rings at impact frequencies and transmits torsional pulses into the gear mesh that increase noise and accelerate tooth wear under the cyclic loading profile of a beet cleaning section. The GGG50 housing also machines to tighter dimensional tolerances, allowing bearing bores and shaft alignments to be held within the narrow range needed for consistent gear contact patterns across the production run. Every housing is pressure-tested before assembly and finished with an epoxy primer coat that has been validated to 500-hour salt-spray resistance — a relevant standard given how thoroughly modern UK harvesters are pressure-washed between and during campaigns.
🔒 Sealing System
A three-stage sealing philosophy prevents the fine clay-laden water that saturates UK beet harvesting from reaching the bearing races. The primary FKM (fluoroelastomer) lip seal provides the main exclusion barrier. A secondary spring-loaded contact seal acts as a backup if minor lip wear occurs mid-campaign. The outer labyrinth creates a tortuous path that slows the progress of any contamination that might bypass both inner stages. FKM compound retains its elasticity at the low temperatures typical of a pre-dawn start in October across East Anglia or Lincolnshire, so the lip stays in contact with the shaft and does not go brittle and lift the way standard NBR seals occasionally do at 0 to 3 degrees C during early-morning engagement. This detail alone has prevented a significant number of mid-campaign failures for our UK contractor customers.
⚙️ Bearing Selection and Preload
Tapered roller bearings — selected to Timken or SKF equivalence standards — are specified individually for each shaft position based on the radial and axial loading that the star geometry actually imposes, not a generic rule-of-thumb safety margin. Preload shimming is set on a dedicated bearing test rig in the Ever Power assembly department, not by feel on the assembly bench. This produces consistent bearing life from unit to unit rather than the batch variation that causes some machines to have early failures and others to run for three seasons without issue. The preload procedure also ensures that the gear backlash specification is maintained from day one of service, which is the baseline condition for correct cleaning star timing and low-vibration operation.
Why UK Contractors and OEMs Specify Ever Power Cleaning Star Gearboxes
Six performance pillars — engineered from real beet harvesting experience across UK soils
Zero-Backlash Design
Pre-loaded tapered bearings and precision-ground gears eliminate the lash that causes star-to-star timing drift — a condition that produces both beet bruising and poor separation efficiency, reducing tare at the factory weighbridge.
Stone-Impact Rated
Every unit carries a 2.5x service factor above nominal torque to handle sudden loading when a stone passes through the cleaning section — a regular occurrence in rocky Lincolnshire, Yorkshire Wolds, and Scottish highland beet fields.
OEM Drop-In Compatibility
Mounting faces, shaft diameters, and flange patterns are matched to the major OEM footprints used by Holmer, Grimme, Ropa, and Agrifac — allowing direct replacement without adapter plates, re-drilling, or machine modifications during a campaign stop.
Cold-Weather Reliability
FKM seals and synthetic-blend oil options maintain full sealing and lubrication effectiveness at -25 degrees C — no waiting for the gearbox to warm up before engaging harvest speed at four in the morning in a Lincolnshire field in November.
UK Bonded Stock Programme
Core cleaning star gearbox models for the most widely used UK harvesters are held in bonded UK warehouse stock, enabling next-business-day delivery during the campaign window — the capability that matters most when a machine is sitting in a wet Fenland field waiting for a part.
Pełna inżynieria niestandardowa
Shaft layout, ratio, flange dimensions, paint specification, and nameplate data can all be modified for OEM private-label or bespoke machine programmes — from engineering concept through prototype to volume production within documented lead times agreed at order stage.
Application Scenarios: Where the Cleaning Star Gearbox Is Used Across the UK
From large-scale sugar beet operations in Lincolnshire to fodder beet production in Scotland and Northern Ireland, the same core gearbox platform serves a diverse range of harvesting situations — each with its own engineering requirements.
Sugar Beet Self-Propelled Harvesters
This is the primary application. Six-row and eight-row self-propelled machines such as the Holmer Terra Dos T4-40, Grimme REXOR 620, and Ropa Euro-Tiger run two or three stages of cleaning stars, each requiring a separate gearbox drive. The cleaning star gearbox in this context must handle continuous 10 to 14-hour shifts throughout the October to December campaign in the main UK beet-growing counties: Lincolnshire, Norfolk, Nottinghamshire, Cambridgeshire, and the East Riding of Yorkshire. The continuous-duty load cycle places extreme demands on both lubrication temperature stability and bearing fatigue life — areas where the Ever Power design specifically outperforms lower-cost alternatives.
Fodder Beet Harvesters — Scotland and the South West
Fodder beet, grown extensively across Scotland, Wales, the South West, and Northern Ireland for livestock feeding, presents different engineering challenges to sugar beet. The roots are often larger and heavier, and fields on highland and coastal margins frequently carry a higher stone content in the soil profile. The gearbox must be sized for higher peak torques — a larger root tumbling through the star mechanism creates a momentary spike in resistance — while still handling the material gently enough to avoid cracking or bruising the beet, which reduces palatability and storage life at the clamp. Ever Power’s adjustable ratio range and high service factor make the same gearbox platform suitable for both crops with appropriate configuration at the time of order.
Trailed and Semi-Mounted Harvester Systems
Trailed and semi-mounted beet harvesters remain popular across smaller UK arable farms and with contract operators working mixed-field programmes where a large self-propelled machine cannot be cost-justified. These machines draw all power from the tractor PTO, making the cleaning star gearbox the critical link between a 540 RPM PTO input and the cleaning section. The gearbox must tolerate frequent engagement and disengagement cycles as the operator moves between field headlands without causing premature wear to the input shaft coupling or increasing internal temperature through repeated clutch-slip events. It must also be physically compact enough to suit the tighter chassis packaging of trailed machines.
Stationary Cleaning Tables and Factory Intake Equipment
Not every cleaning star gearbox operates on a mobile harvester. Stationary cleaning tables at farm reception points and sugar factory intake areas also use star-wheel arrays driven by dedicated gearboxes. These fixed installations run for extended periods at a consistent load, placing different demands on lubrication volume, thermal management, and scheduled maintenance intervals compared to mobile use. The Ever Power engineering team can recommend specific oil grades and service intervals tailored to continuous-duty stationary use, along with gearbox variants fitted with oil temperature sensors or sight-glass oil level indicators that support planned maintenance programmes at busy intake sites during the campaign.
PTO Shafts and Cleaning Star Gearboxes: Why the Combination Matters
A cleaning star gearbox is only as reliable as the power source feeding it, and in the vast majority of UK beet harvesting applications, that source is a PTO shaft. Ever Power supplies a matched range of PTO shafts alongside its agricultural gearboxes — not as a secondary catalogue item, but because the interaction between shaft and gearbox input is a primary determinant of both component life and field safety.
The PTO shaft must transmit the correct torque to the gearbox input flange without inducing vibration through misalignment or phase error in the universal joints. An incorrectly specified PTO shaft — wrong overrunning clutch torque rating, worn spline profile, or a guard that is too short for the actual telescoped length in work — creates cyclic torsional pulses that gradually loosen bearing preload and accelerate gear face wear inside the gearbox. The team at Ever Power has inspected cleaning star gearboxes returned from the field with apparent bearing failure that, on detailed examination, trace entirely back to a PTO shaft running at a joint angle beyond its rated limit, or to a shaft whose overrunning clutch torque rating was mismatched to the gearbox’s nominal input torque.
By ordering the cleaning star gearbox and PTO shaft as a matched assembly from Ever Power, UK customers receive a single technical guarantee covering both components, documented installation joint-angle calculations for their specific machine geometry, and a pre-tested coupling interface that will not introduce misalignment-induced loading from the moment the machine first runs. This is especially valuable for contractors replacing components mid-campaign, when there is neither time nor adequate light for careful alignment checks in a beet field in October.
Ever Power PTO Shaft Range — Matched to Cleaning Star Gearbox Applications:
Wide-angle universal joints rated up to 80 degrees operating angle · Friction, shear-bolt, and overrunning clutch options to suit every harvester design · CE-marked guard assemblies meeting current UK and EU machinery directives · 6-spline and 21-spline input profiles · Telescopic lengths from 400 mm to 1,800 mm · Custom cross-kit and yoke specifications for non-standard harvester configurations
Historie sukcesów klientów
Real results from UK beet contractors, agricultural dealers, and European OEM partners
Case Study | Lincolnshire, UK · Sugar Beet Contracting
A.J. Thorpe Agricultural Services — Boston, Lincolnshire
This 1,800-hectare contracting operation had experienced cleaning star gearbox failures on two of its three Holmer Terra Dos T4 machines during consecutive campaign seasons, resulting in combined machine downtime exceeding 30 hours. At the prevailing hire rate for a self-propelled harvester, and accounting for re-harvest costs on beet left in ground, the total financial impact ran well into five figures over the two seasons. The failures in both cases involved bearing collapse following seal contamination — consistent with the FKM vs NBR seal performance difference described in the materials section above.
After switching to Ever Power czyszczenie przekładni gwiaździstych with matched PTO shaft assemblies ahead of the 2022 campaign, both affected machines completed the full 2022 and 2023 seasons without a single gearbox-related stoppage. The contractor also reports that the precision gear mesh and zero-backlash design produced a measurably cleaner beet sample at the Bury St Edmunds factory intake, with tare deductions reduced by an estimated 1.2 percentage points across the contracted acreage over the two seasons.
Result Summary
Two full campaigns completed without gearbox stoppage · Estimated 30+ hours downtime eliminated · Tare deductions reduced by ~1.2 percentage points · Three-machine fleet now running Ever Power units as standard
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“We had run a competitor unit for three seasons and it never made a full campaign without a seal failure letting mud into the bearings. The Ever Power gearbox went straight in on our Grimme as a direct fit and has now done two full seasons. The sealing performance in muddy conditions is genuinely different.”
Robert Fielding — Farm Manager
Cambridgeshire Beet Farms Ltd, UK
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“As a machinery dealer covering the Scottish Borders and Dumfries area, we hold Ever Power cleaning star gearboxes in stock specifically because OEM parts for certain older Agrifac models can take two to three weeks. The Ever Power units arrive within two business days from the UK warehouse and our customers cannot tell the difference in service.”
Duncan McAllister — Parts Manager
Border Agricultural Machinery, Dumfries, Scotland
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“We integrated Ever Power’s cleaning star gearboxes into a new compact beet harvester prototype developed for the Baltic export market. Their team provided 3D models within ten days, customised the output shaft pattern to our chassis design, and delivered pre-production samples on schedule. The manufacturing accuracy matched what we need for volume OEM supply.”
Andris Berzins — Chief Design Engineer
AgroTech Solutions, Riga, Latvia (OEM Partner)
Manufacturing Capability and Custom Engineering Services
Ever Power’s production facility operates dedicated gear machining centres, CNC turning lines, and gear grinding machines capable of achieving AGMA 12 quality on bevel and helical gear sets. The quality management system is ISO 9001 certified, and the inspection department operates co-ordinate measuring machines (CMM) for 100% dimensional verification of critical gear geometry on every agricultural gearbox production run — not statistical sampling, but full verification. This approach eliminates the batch-to-batch geometry variation that causes inconsistent backlash and early failure in gearboxes manufactured to lower quality standards.
Product customisation is a core service, not an exception. For OEM customers developing new harvester designs or upgrading existing platforms, Ever Power’s engineers work from a customer concept sketch, an existing competitor unit, or a full CAD package to produce a dimensionally equivalent replacement, a performance-enhanced variant, or an entirely new gearbox design. Services include finite element analysis (FEA) of housing stress concentrations under shock loading, gear contact pattern simulation, bearing L10 life calculation under the specific duty cycle, and complete proto-to-production documentation packages including assembly procedures, torque specifications, and oil-fill instructions ready for the OEM’s own service literature.
UK importers and dealers can access a private-label programme under which cleaning star gearboxes are supplied branded with the customer’s own name, colour scheme, and part number structure. This allows dealers to protect their own replacement parts business and build brand recognition with their farmers without competing directly with Ever Power’s own range in the same territory. Minimum order quantities for private-label production are discussed individually and depend on the model and configuration required.
Certyfikat ISO 9001
Full quality management system with CMM inspection
4–8 Week Lead Time
Custom and low-volume builds; stock models faster
FEA + CMM Verified
Engineering-led process from concept to production
Private Label Available
OEM branding, colours, and part numbers
Często zadawane pytania
Answers to the questions UK contractors, dealers, and OEM teams ask us most about cleaning star gearboxes
Contact Ever Power — UK Agricultural Gearbox Supplier
Ready to Specify a Cleaning Star Gearbox for Your Beet Harvester?
Whether you need a direct replacement, a custom design, a volume OEM supply agreement, or advice on the right PTO shaft to pair with a new gearbox unit, the Ever Power engineering and sales team responds within one business day. Contact us at [email protected]
Ever Power Agricultural Gearboxes · Cleaning Star Gearbox Specialist · Supplying UK beet harvester contractors, OEMs, and dealers across England, Scotland, Wales, and Northern Ireland · [email protected]
