EP-DSO80 Dual-Side Output Gearbox — 60 to 80 KW, Twin-Shaft Speed Increaser

EP-DSO80 Dual-Side Output Gearbox — Product Overview

One Input, Two Outputs — Symmetric Power Splitting

Many cultivation implements require simultaneous power delivery to two working elements positioned on opposite sides of the machine frame — twin rotor assemblies in straw choppers, dual spindle heads in side-delivery cultivators, or paired seed-incorporation units in combined tillage systems. The EP-DSO80 dual-side output gearbox solves this by splitting a single 540 rpm PTO input into two synchronized output shafts, one on each side of the housing, delivering identical speed and torque to both implement sides without requiring separate drive lines or chain-and-sprocket distribution systems.

Speed Increase, Not Reduction

Unlike the majority of intermediate gearboxes in Korea Ever-Power’s rotary cultivator gearbox range (which reduce PTO speed), the EP-DSO80 is a speed increaser. Both available ratios produce output speeds higher than the 540 rpm input: 825 rpm at 0.654 : 1 or 1,234 rpm at 0.4375 : 1. This speed multiplication drives implements whose working elements operate most efficiently at rotor speeds above PTO speed — such as high-speed straw choppers, flail mechanisms, and centrifugal distribution heads.

Power Rating & Build Quality

Rated at 60–80 KW (80–110 HP), the EP-DSO80 is built for mid-power tractors driving wide cultivation implements. The distinctive blue-painted HT250 cast-iron housing is CNC-machined to ±0.02 mm bore tolerance, ensuring perfect bearing seat alignment and output shaft concentricity. The dual-output architecture uses matched spiral bevel gear sets ground as lapped pairs, providing smooth, quiet power distribution with balanced torque splitting between the two sides.

Full Technical Specifications — Both Ratio Configurations

Dual-Output Architecture — How the EP-DSO80 Splits Power

Bevel Gear Power Splitting

The EP-DSO80 uses a central input bevel pinion that meshes with two symmetrically opposed ring gears — one driving each output shaft. Because both ring gears share the same pinion and are manufactured as a matched set, both outputs rotate at precisely identical speeds and receive equal torque. This mechanical synchronization is inherently more reliable than electronic or hydraulic torque-balancing systems, as there are no sensors, controllers, or actuators that can fail in the harsh agricultural environment.

Why Two Different Output Shaft Sizes

The EP-DSO80 features asymmetric output shafts: Ø42/Ø36 mm on one side and Ø48/Ø42 mm on the other. This is a deliberate design choice for implements where the two driven elements have different inertial loads or startup torque requirements. The larger shaft side handles the heavier working element (such as the main cutting rotor), while the smaller shaft side drives the lighter element (such as a distribution fan or secondary rotor). Both shafts transmit equal steady-state torque, but the larger shaft provides greater torsional stiffness for absorbing startup and impact transients.

Speed Increase Engineering

In a speed-increase gearbox, the input torque is divided by the ratio while speed is multiplied. At the 0.654 : 1 ratio, each output receives approximately 625 N·m of torque (at 80 KW input) at 825 rpm. At 0.4375 : 1, each output receives approximately 415 N·m at 1,234 rpm. The gear tooth profiles and bearing selections are specifically calculated for these higher speeds and the associated centrifugal loading — the EP-DSO80 is not a reversed reducer but a purpose-engineered speed increaser with appropriate bearing preloads, oil splash patterns, and seal lip speeds for sustained high-RPM operation.

Two-Ratio Selection Guide — 825 rpm vs. 1,234 rpm

The EP-DSO80 is available in two ratio configurations. The ratio is fixed at the factory — unlike the EP-225 multi-ratio gearbox, the EP-DSO80’s dual-output architecture does not support field-swappable gear sets. Specify the correct ratio when ordering based on your implement’s required rotor speed.

Key Dimensions & Output Shaft Details

Field Application Scenarios

Dual-Rotor Straw Choppers

Wide straw choppers used for rice straw and corn stubble incorporation frequently use twin counter-rotating rotors to process crop residue across their full working width. The EP-DSO80 drives both rotors from a single PTO input, eliminating the chain-and-sprocket side-drive systems that require constant tensioning and periodic replacement. The 825 rpm output (0.654 ratio) provides the rotor speed most Korean choppers are designed for, while the 1,234 rpm option (0.4375 ratio) suits high-speed fine-shredding machines.

Twin-Spindle Cultivation Equipment

Certain specialized cultivators use twin vertical spindles positioned symmetrically across the implement width to achieve uniform soil processing. The EP-DSO80’s synchronized dual outputs ensure both spindles operate at identical speeds, preventing uneven soil treatment or asymmetric draft forces that can cause the implement to track off-center during field passes.

Side-Delivery Residue Management

Implements that windrow or side-deliver crop residue use paired conveying mechanisms driven from opposite sides of the machine. The EP-DSO80 provides the symmetric power source for these mechanisms, with the asymmetric shaft sizes accommodating the difference in load between the cutting element (heavier) and the conveying element (lighter) without requiring separate belt or chain drives.

Why Choose the EP-DSO80 for Your Dual-Drive Implement

Installation & Commissioning

Mounting Procedure

❶ Position the EP-DSO80 on the implement frame with both output shafts aligned to their respective driven elements. Verify that keyway orientations match the coupling or pulley hub positions on both sides.

❷ Secure the housing to the implement frame using the base mounting bolts. Torque to specification in a star pattern. Re-check after 8 operating hours.

❸ Connect the PTO drive shaft to the top input boss. Ensure proper spline engagement depth and install the shaft safety guard.

❹ Fill gear oil (SAE 80W-90 GL-5) through the breather port — approximately 2.5 liters. The higher oil capacity is necessary for the thermal load generated by speed-increase operation.

❺ Run a 5-minute idle test at low PTO speed. Verify both outputs rotate freely, no abnormal noise from either side, and no oil seepage at any seal point. Then bring to full 540 rpm and confirm stable, quiet operation before field engagement.

Maintenance Schedule

◆ Before every work session — Check oil level; inspect both output shaft seals and keyway couplings.

◆ After first 100 hours — First oil change: drain, flush, refill with fresh SAE 80W-90 GL-5.

◆ Every 400 hours — Oil change (shorter interval than reducers due to higher operating speeds and heat generation).

◆ Every 800 hours — Inspect both keyways for deformation; check bearing play on both output shafts.

◆ Cold climates (below −20°C) — Switch to SAE 75W-90 full-synthetic GL-5.

Companion Products & Driveline Components

PTO Drive Shafts

Korea Ever-Power supplies matched cardan shafts rated for the EP-DSO80’s input torque requirements. Because the gearbox operates as a speed increaser, the input shaft sees the full tractor PTO torque without reduction — the drive shaft must be sized accordingly. Our engineering team can recommend the correct shaft series based on your tractor model and working conditions.

Seasonal Equipment Pairings

Farms using the EP-DSO80 on dual-rotor choppers during autumn straw season often run standard rotary tiller gearboxes for spring tillage and round baler gearbox assemblies for straw baling. Korea Ever-Power manufactures the complete range of intermediate, speed-increaser, and rear-drive gearboxes to cover every seasonal implement change.

Frequently Asked Questions

Customer Reviews & Field Reports