Precision Feed Control: The Key to Premium Silage
In silage harvesting, the Length of Cut (LOC) is the defining metric for fermentation quality and livestock digestibility. For Korea’s premium Hanwoo cattle industry, feed consistency is non-negotiable. Our Feed Roll / LOC Gearbox is more than a transmission; it is a precision variable-speed controller. It drives the intake rollers, feeding the crop into the cutterhead at a calibrated speed to physically alter the cut length (e.g., from 4mm to 22mm) without changing engine RPM.
The EVER-POWER LOC-Pro series features a patented “Quick-Shift” Architecture. During the winter harvest of Italian Ryegrass in Jeollabuk-do—a crop notorious for high moisture and toughness—feeding blockages are common. Our gearboxes integrate a heavy-duty Reversing Mechanism. When the metal detector trips or a slug of wet grass jams the rolls, the operator can instantly engage the reverse gear to eject the blockage within 0.5 seconds, protecting the cutterhead and minimizing downtime. Built with a reinforced nodular iron housing, it withstands the torsional chassis stress typical of Korea’s mountainous terrain.
Figure 1: The LOC gearbox regulates feed roll speed to control silage particle size.
Technical Specification Matrix (Series LOC-Pro 500)
Designed to match self-propelled and tractor-mounted forage harvesters in the 200HP – 600HP class, optimized for East Asian crop conditions.
| Parameter | Specification Data | Standard / Note |
|---|---|---|
| Max Input Power | 180 kW (245 HP) | Continuous Duty S1 |
| Rated Input Speed | 1000 RPM / 2100 RPM | Hydraulic Motor or PTO |
| LOC Gear Steps | 4-Speed / IVT Optional | LOC Range: 4mm – 22mm |
| Max Output Torque | 2,800 Nm | Peak Shock: 4,500 Nm |
| Gear Material | 20CrMnTiH Alloy Steel | Carburized 58-62 HRC |
| Housing Material | Ductile Iron QT500-7 | High Impact Resistance |
| Shifting Mechanism | Hydraulic Clutch / Sliding Collar | Power-Shift Ready |
| Reversing Function | Integrated Rapid-Reverse | For Clearing Blockages |
| Lubrication | Forced Oil Pump + Splash | Internal Filter Included |
| Seal Type | FKM (Viton) Cassette Seals | Resists Acidic Silage Juice |
| Bearing Life (L10) | > 12,000 Hours | Heavy-Duty Tapered Roller |
| Input Shaft Spline | 1-3/4″ Z20 Involute | DIN 5480 |
| Output Shaft | Hexagonal / Flange Mount | Universal Joint Connection |
| IP Rating | IP66 (Washdown Safe) | – |
| Temp Range | -20°C to +95°C | Winter Harvest Ready |
| Noise Level | < 82 dB (A) | Precision Ground Gears |
| Paint Finish | 2-Part Epoxy Primer + Topcoat | Salt Spray > 500h |
| Weight (Dry) | 85 kg – 145 kg | Dependant on Ratio Config |
| Safety Integration | Integrated Friction Clutch | Overload Protection |
| Fatigue Life | Infinite Life Design (Gears) | AGMA 2001-D04 |
| Mounting | Side Flange / Suspension | Multi-position Bosses |
| Breather | Sintered Bronze Filter | Dust Exclusion |
| QC Standard | 100% Spin & Leak Test | Pre-shipment |
| Compatibility | Corn & Pick-up Headers | Versatile |
| Maintenance | 50h Break-in, 1000h Interval | Synthetic Oil Recommended |
Structural Anatomy: “Soft Grip, Hard Cut” Logic
The LOC gearbox mounts on the side of the cutterhead frame, transmitting power via universal shafts to the feed rollers. Its core function relies on altering the transmission ratio to control linear intake speed.
- Multi-Stage Shifting Module: Utilizing heavy-duty sliding collars or hydraulic clutch packs. In “Long Cut” mode, the gearbox outputs high RPM, driving crop swiftly into the knives for coarser silage (for cattle). In “Short Cut” mode, intake slows down, resulting in finer particles (for biogas).
- Metal Detector Linkage: The input shaft features a “Quick-Stop” Interface. When the intake metal detector senses foreign objects (like fencing wire common in Korean fields), the system triggers the gearbox clutch to halt feeding within 0.03 seconds, saving the cutting cylinder from catastrophic damage.
- Floating Roller Adaptation: The output flange allows for angular misalignment, compensating for the vertical “floating” movement of the feed rollers as they adjust to varying crop mat thicknesses, ensuring constant torque delivery even with uneven loads.
[South Korea] Regional Adaptation & Compliance
Korean silage farming is characterized by “Small Plots, High Value, Multi-Crop.” From Gyeonggi-do corn to southern winter rye, the environment is demanding. EVER-POWER’s gearbox solutions include specific localizations:
FACT (Foundation of Agri. Tech. Commercialization and Transfer) Readiness
Machinery components sold in Korea must meet rigorous safety standards. Our gearboxes comply with KS B 7943 (Safety of Agricultural Power Transmission). All rotating points feature pre-drilled mounting bosses for yellow safety shields, ensuring seamless FACT inspection approval for OEMs.
Surviving “Jangma” & Frozen Soil
Korea’s “Jangma” (monsoon season) means harvesting often occurs in mud, while winter rye is harvested on frozen ground. We utilize Cassette Combination Seals and a labyrinth dust shield on the output. This prevents mud and highly acidic silage juice from entering the housing, preventing oil emulsification and bearing failure.
Figure 2: Reinforced gear sets capable of handling the high resistance of wet Italian Ryegrass.
Performance Benchmarking: The EVER-POWER Edge
| Core Feature | EVER-POWER LOC-Pro Series | Standard Aftermarket Unit |
|---|---|---|
| Gear Heat Treatment | Deep Carburizing + Grinding (DIN 6) | Induction Hardening (Surface only) |
| Reverse Response Time | < 0.5 Seconds (Prevents Belt Burn) | > 2.0 Seconds (Sluggish) |
| Seal Corrosion Resistance | Viton + Stainless Sleeve | NBR (Degrades in Silage Acid) |
| Warranty | 2 Harvest Seasons (24 Months) | 6 Months |
*Disclaimer: Comparison data based on 2025 internal testing of common Asian market competitors. Performance may vary by condition.
From the Engineer’s Desk: Design Philosophy
— Chief Drivetrain Engineer, EVER-POWER R&D
Compatibility Note: Our gearboxes are designed to seamlessly replace or adapt to feeding systems found on major brands (Brand names for reference only):
- Claas Jaguar Series (Select LOC drives)
- John Deere 8000/9000 Series (Feed roll modules)
- New Holland FR Series
- Local Korean brands like LS Mtron forage implements.
Field Reports: Solving Real Pain Points
Case 1: Dairy Farmer Mr. Kim (Gangwon-do)
Pain Point: “My old gearbox overheated in dense corn silage, causing seals to leak and belts to slip. The cut length varied wildly, affecting my feed quality.”
Solution: Retrofit with EVER-POWER’s enhanced cooling LOC gearbox and synthetic oil.
Result: “Now the cut is perfectly uniform at 18mm, and zero leaks all season. This is the reliability I needed.”
Case 2: Agricultural Co-op (Jeollanam-do)
Pain Point: Harvesting wet winter Ryegrass often snapped input shafts on old gearboxes due to wrapping/clogging.
Solution: Introduced an input shaft with an integrated friction slip clutch.
Result: Mechanical failure rate dropped by 90%, significantly boosting the cooperative’s efficiency.
Maintenance Guide: When to Replace?
- Uneven Cut Length: If forage length varies, it indicates excessive internal gear backlash or worn shifting mechanisms.
- Metallic Clunking: A clicking sound under load changes suggests bearing cage failure.
- Milky Oil: Check the sight glass. Milky white oil means seal failure and water/acid ingress. Immediate replacement is required.
B2B Frequently Asked Questions (FAQ)
Q1: Can this gearbox start in Korean winter conditions?
Yes. We recommend using 75W-90 synthetic gear oil in winter. Coupled with our low-temp FKM seals, it starts reliably down to -25°C.
Q2: Do you provide a cut-length chart?
Yes, every gearbox comes with a decal and manual detailing the theoretical cut lengths for each gear setting (e.g., Gear 1: 6mm, Gear 2: 12mm), aiding operator setup.
Q3: How fast can I get spare parts in Korea?
We distribute via Busan and Incheon ports. We advise dealers to stock common wear items (seals, bearings). Urgent air freight takes just 3-5 days.
Q4: Can you customize the input spline?
Absolutely. As a manufacturer, we can machine input shafts to match any yoke or hydraulic motor interface (DIN, SAE standards) based on your drawings.
Q5: Does it include an anti-reverse ratchet?
Selected models do. For machines requiring prevention of feed roll reversal during shutdown, we can integrate one-way clutches or ratchet mechanisms.
One-Stop Drivetrain Supply
Beyond the LOC gearbox, EVER-POWER supplies the complete powertrain for forage harvesters:
Why Partner with EVER-POWER?
In the golden window of silage harvest, downtime is a financial disaster. EVER-POWER delivers not just gearboxes, but assurance. We control the entire process from raw material to assembly, ensuring every gear survives the intensity of Korean agriculture.
Need a custom solution? Our engineering team can provide retrofit proposals within 48 hours.
Editor: Cxm
