2-Speed Fan Gearbox for Orchard SS Sprayers

Precision Airflow Control for Korean Mountainous Orchards & Vineyards

Optimizing Air-Blast Performance in Korean Topography

In the specialized domain of plant protection machinery, particularly for the Speed Sprayers (SS) that dominate the Korean agricultural landscape, the transmission system acts as the aerodynamic command center. The ever-power 2-Speed Fan Speed Increaser Gearbox is engineered not simply to transmit power, but to solve the kinetic contradictions inherent in managing orchards located on 20-degree slopes in regions like Gyeongsangbuk-do and Jeollanam-do. Unlike flat-land farming, Korean apple and pear orchards require machinery that can decouple engine RPM from fan speed to maintain safety during steep ascents while ensuring sufficient air velocity for canopy penetration.

Standard single-speed gearboxes often force operators to run tractor engines at redline to achieve necessary air throw, resulting in excessive fuel consumption and engine overheating during the humid Monsoon (Jangma) season. Our dual-speed solution allows for a “High” ratio (typically 1:4.5) for dense canopy penetration in late summer, and a “Low” ratio (1:3.5) for early-season dormant spraying or treating younger, fragile saplings. This flexibility is critical for compliance with the strict pesticide drift regulations enforced near the densely populated farming communities of Naju and Yeongju.

Furthermore, the internal architecture of our gearbox addresses the high axial thrust loads generated by 500mm to 900mm axial flow fans. We utilize a reinforced output shaft assembly with paired tapered roller bearings, specifically calculated to absorb the “push-back” force of the fan blades, a common failure point in generic replacement units. This ensures the agricultural gearbox remains vibration-free even when operating at output speeds exceeding 2400 RPM.

Technical Specifications: Model EP-FanDrive-2S

Designed for 50-90HP tractor-mounted or trailed air-blast sprayers. The following parameters are validated for heavy-duty cycle operations.

Parameter	Specification	Parameter	Specification
Rated Input Power	48 kW (65 HP)	Input Speed (PTO)	540 RPM
Ratio 1 (Low)	1 : 3.5 (Output ~1890 RPM)	Ratio 2 (High)	1 : 4.5 (Output ~2430 RPM)
Max Output Torque	420 Nm	Neutral Position	Yes (0-Position for Mixing)
Housing Material	Cast Iron QT450-10 (Ductile)	Gear Material	20CrMnTiH (Carburized)
Shaft Material	40CrNiMoA Alloy Steel	Input Spline	1-3/8″ Z6 (Standard PTO)
Output Shaft Type	Cylindrical Ø35mm / Flange	Oil Capacity	1.85 Liters
Lubrication Type	Splash Bath & Channel	Bearings	NSK / SKF Tapered Roller
Seal Type	Double Lip FKM (Viton)	Operating Temp	-25°C to +95°C
Noise Level	< 82 dB at 1m	Shifter Type	Mechanical Lever (Rear)
Weight (Dry)	26.5 KG	Mounting	4-Bolt Base (120x120mm)
IP Rating	IP65 (Dust/Water)	Fatigue Life	> 6000 Hours (L10)
Tooth Profile	Helical (High Speed Stage)	Efficiency	96% per stage
Service Factor	1.5 AGMA	Vibration Class	VDI 2056 Class G
Paint Finish	Epoxy Powder Coat	Certifications	CE, ISO 9001:2015

Orchard sprayer application in high density apple farm

Figure 1: High-density orchard spraying requires precise air velocity control managed by the gearbox.

South Korea: Extreme Operating Conditions & Compliance

Terrain Adaptation: The “70% Slope” Challenge

South Korea’s topography is uniquely challenging for agricultural machinery, with over 70% of the land being mountainous. In regions like Gangwon-do (high-altitude vegetables) and Gyeongsangbuk-do (apples), Speed Sprayers often operate on inclines exceeding 25 degrees. Standard splash lubrication systems fail at these angles, starving the upper bearings of oil. ever-power has redesigned the internal oil channels of the EP-FanDrive series to ensure active lubrication even at extreme tilt angles, preventing the “dry start” failures common in competitor units during uphill spraying runs.

Regulatory Alignment: FACT & KS Standards

Our gearboxes are not just physically robust; they are compliant with the regulatory framework necessary for the Korean market. We engineer our units to meet the strict safety and noise standards required for certification by the Foundation of Agri. Tech. Commercialization & Transfer (FACT).

KS B 7943 Compliance: Our input shaft safety guards align perfectly with Korean Safety Standards for agricultural power take-off.
Noise Abatement: Designed to keep operating noise below 85dB, critical for orchards near residential zones in provinces like Gyeonggi-do.
PTO Interface: Standard 1-3/8″ 6-spline compatibility with major Korean tractor brands (Daedong, LS Mtron, TYM).

Engineer’s Notebook: Overcoming the “Heat Trap”

Subject: Thermal Saturation in Enclosed Cowlings

Date: Field Test, July 2024

Location: Naju Pear Orchard, South Korea
“We identified a critical failure mode in competitor gearboxes used in SS (Speed Sprayer) machines. The gearbox is typically buried deep inside the aerodynamic cowling. While the fan moves air away from the machine, the gearbox itself sits in a ‘dead zone’ of stagnant air, leading to case temperatures exceeding 110°C during the humid Korean summer. This cooks the oil seals.
Design Iteration 5.0: We modified the casting mold to include vertical cooling fins that protrude into the low-pressure zone of the fan intake. This induces a forced convection effect. We also upgraded the input seal to a Viton (FKM) compound capable of withstanding 200°C. Subsequent thermal imaging in Naju showed a 22°C drop in operating temperature compared to the previous generation.”
– Lead Engineer, Drivetrain Division

Why Choose ever-power?

In a global market flooded with generic components, ever-power stands apart through a philosophy of “Metallurgical Integrity.” We understand that a gearbox is only as durable as its weakest gear tooth. Unlike many suppliers who outsource heat treatment, we maintain strict control over our carburizing processes. Our gears undergo a precise multi-stage heat treatment that achieves a case depth of 0.8mm to 1.2mm, tailored specifically to the module of the gear. This creates a diamond-hard wear surface while retaining a ductile core capable of absorbing the shock loads when a heavy axial fan is engaged at high RPMs.

Our commitment extends beyond manufacturing to comprehensive support. We recognize that downtime during the critical spraying window—often just a few days for fungal treatments in wet seasons—is unacceptable. Therefore, we have implemented a “Rapid Response” protocol for our B2B partners. We provide full 3D CAD models to help your designers integrate our gearbox into your chassis seamlessly, and our engineering team offers customization in gear ratios to perfectly match the aerodynamic curve of your specific fan blade design.

Furthermore, reliability is quantified. Every single unit leaving our factory undergoes a 100% spin test for noise, vibration, and leak detection. We do not rely on statistical sampling for final quality checks. When you partner with ever-power, you are gaining a transmission specialist who acts as an extension of your own R&D department. For more on our capabilities.

ever-power Factory Quality Control

Advanced CNC machining ensures ISO-grade tolerance on all bearing seats.

Global Success Cases: Solving Real-World Problems

Case 1: The “Burnt Leaf” Issue (Korea)

Client: SS Manufacturer, Daegu, South Korea.

Challenge: Farmers complained that high wind velocity (40m/s) was damaging young apple saplings, yet they needed that power for mature trees. Single-speed boxes lacked versatility.

Solution: Adoption of EP-FanDrive-2S. The “Low” ratio (1:3.5) provided a gentle 25m/s breeze for nurseries, while “High” gear retained full power. Result: Zero crop damage claims in the following season.

Case 2: The Silent Valley (Italy)

Client: Vineyard Sprayer OEM, Trentino, Italy.

Challenge: New EU noise regulations were strict. The rattling from straight-cut gears in competitor boxes was exceeding 85dB, requiring expensive foam lining.

Solution: Switching to ever-power’s helical gear set reduced high-frequency whine. Result: The machine passed homologation without additional acoustic insulation, saving €150 per unit.

Case 3: The Dust Bowl (Australia)

Client: Macadamia Farm Service, Queensland.

Challenge: Abrasive silica dust was destroying standard output seals within 200 hours of operation.

Solution: We implemented a “Cassette Seal” system with an integrated grease labyrinth. Result: Seal life extended to over 1200 hours, significantly reducing maintenance downtime.

Compatibility & Interchangeability

Our gearboxes are designed as drop-in replacements for many standard configurations found in the market. While we engineer our own improvements, the mounting interfaces are often compatible with sprayers using components from brands such as Comer, Bondioli & Pavesi, or various Korean OEM transmissions.

*Disclaimer: All original equipment manufacturer (OEM) names, part numbers, and descriptions are for reference purposes only. ever-power is an independent manufacturer and our products are aftermarket replacement parts.

Frequently Asked Questions

Q1: How do I engage the Neutral position for tank mixing?

A: The gearbox shift lever has three positions: Low (1), Neutral (0), and High (2). By placing the lever in the center “0” position, the output shaft is disengaged, allowing the tractor PTO to drive the pump for chemical agitation without spinning the fan. This saves fuel and reduces noise during filling.

Q2: What is the recommended oil change interval for Korean climate conditions?

A: For the Korean climate (hot summers, cold winters), we recommend the first oil change after 50 hours of break-in. Subsequent changes should be every 500 hours or once per season. We suggest a high-quality SAE 80W-90 (API GL-5) gear oil.

Q3: Can this gearbox support fans larger than 800mm?

A: Yes, the EP-FanDrive-2S is rated for axial fans up to 900mm in diameter. For larger fans (1000mm+), which exert significantly higher gyroscopic forces, please consult our engineering team for our Heavy-Duty (HD) series.

Q4: Is the shift lever position adjustable?

A: Standard units come with a rear-mounted lever. However, we offer remote cable-shift kits that allow the operator to change fan speeds from the safety of the tractor cabin, a feature increasingly requested for modern cabin tractors.

Q5: How do you handle spare parts for international orders?

A: We supply a “Critical Spares Kit” with every bulk order, containing seals, bearings, and shifter forks. We also maintain a stock of standard parts for immediate air freight dispatch to our global partners.