EP-2250B Baler Speed Increaser Gearbox — 70 to 100 KW, 1125 mm Extended Tube Output

EP-2250B Baler Speed Increaser Gearbox — Product Overview

The Extended-Reach Baler Drive

Large-frame round balers and wide-pickup straw return machines position their main drive input hub significantly deeper inside the implement frame than compact models. When a standard 900 mm tube gearbox cannot bridge the full distance from the PTO attachment point to the baler’s internal mechanism, the EP-2250B provides the answer: an extended 1,125 mm output tube that reaches 225 mm further into the round baler gearbox mounting zone without requiring intermediate shafts, couplings, or additional bearing supports.

Identical Gear Set, Longer Reach

The EP-2250B shares its entire internal gear mechanism with the EP-1800B — the same 0.4375 : 1 spiral bevel gear pair, the same 70–100 KW power rating, and the same 1,234 rpm output speed. The housing, bearings, seals, and input spline (8×42×48×8) are identical. The only engineering difference is the output tube: 1,125 mm instead of 900 mm, with a correspondingly longer internal output shaft, additional mid-span bearing support, and recalculated torsional stiffness for the extended length.

Output Interface & Compatibility

The output end of the 1,125 mm tube terminates in the same Ø50 mm keyed shaft (14 × 70 mm keyway) and Ø220 mm flange (4-Ø13 bolts on Ø190 PCD) as the EP-1800B. This means any baler designed for the EP-1800B’s output interface can accept the EP-2250B simply by accommodating the longer tube — no changes to the baler’s internal drive hub, chain system, or mounting hardware are required.

Full Technical Specifications

EP-1800B vs. EP-2250B — Which Tube Length Fits Your Baler?

The EP-1800B and EP-2250B are mechanically identical except for tube length. Choosing the correct variant is a simple measurement exercise — measure the distance between your baler’s PTO gearbox mounting point and its internal drive hub, then select the model that matches:

1,125 mm Tube Engineering — Maintaining Rigidity at Extended Length

Torsional Stiffness Over 1,125 mm

Extending the output tube from 900 mm to 1,125 mm increases the unsupported shaft span by 25%, which directly reduces torsional stiffness by the same proportion if no countermeasures are taken. Korea Ever-Power addresses this by adding a mid-span bearing support inside the tube at the 560 mm position, dividing the shaft into two shorter segments that each maintain the same stiffness-per-unit-length as the EP-1800B. This ensures angular deflection at the output flange remains below 0.5 degrees per meter at rated torque — the same specification as the shorter variant.

Critical Speed Margin at 1,234 RPM

At 1,234 rpm, the internal output shaft must operate well below its first critical speed (the RPM at which resonant vibration begins). A longer shaft has a lower critical speed, so the EP-2250B’s shaft is designed with a slightly larger effective diameter at the mid-span bearing point to push the first critical speed above 2,500 rpm — providing more than a 2× safety margin above operating speed. This engineering prevents the shaft whip vibration that can destroy bearings, seals, and even the tube itself in poorly designed extended-length gearboxes.

Structural Load Distribution

The 1,125 mm tube carries not only torsional drive loads but also the bending moments from the baler frame’s weight distribution during field operation and transport. The 160 × 76 mm tube cross-section provides the section modulus needed to resist these bending loads without permanent deformation, even when the baler traverses rough field boundaries and drainage channels at transport speed. The tube must be supported by the baler frame’s guide brackets at intervals not exceeding 375 mm along its length.

Key Dimensions & Mounting Interface

How to Measure & Select the Correct Tube Length

Selecting between the EP-1800B (900 mm) and EP-2250B (1,125 mm) requires one critical measurement from your baler. Follow these steps:

Field Application Scenarios

Large-Frame Round Balers

Modern large-frame round balers with 1.2–1.5 meter bale diameter and wide pickup assemblies (2.2+ meters) have longer frames than compact models. The additional 225 mm of tube reach in the EP-2250B bridges this extended frame length, connecting the PTO input directly to the baler’s central chain-drive distribution hub without requiring the adapters or extension couplings that become failure points under sustained high-RPM operation.

Wide-Pickup Straw Return Machines

Straw return machines designed for wide windrow processing (2.5+ meters) position their high-speed chopping rotors deep inside a long frame to maximize material handling capacity. The EP-2250B’s 1,125 mm tube reaches these distant rotor inputs, delivering 1,234 rpm for fine straw shredding while the gearbox housing remains at the front of the machine near the PTO attachment for optimal driveline geometry.

Multi-Crop Baling Operations

Farms and contract operators baling rice straw, wheat straw, and corn stover across multiple crop types benefit from the EP-2250B’s 100 KW power ceiling. The thicker, more fibrous corn stalks demand higher compression force than rice straw, and the 1,234 rpm output ensures consistent pickup reel and chamber roller speeds regardless of crop material density.

Why Choose the EP-2250B

Installation & Maintenance

Mounting Procedure

❶ Mount the EP-2250B gearbox housing to the baler’s front crossmember. Ensure the 1,125 mm tube is supported by frame guide brackets at intervals not exceeding 375 mm.

❷ Engage the Ø50 keyed output shaft into the baler’s internal drive hub and secure the Ø220 flange (4-Ø13 on Ø190). Torque flange bolts to specification in a star pattern.

❸ Connect the PTO drive shaft to the 8×42×48×8 input spline. Verify full engagement and install the safety guard.

❹ Fill gear oil (SAE 80W-90 GL-5) through the breather valve. Run a 5-minute idle test and verify smooth 1,234 rpm output at full PTO speed before field engagement.

Maintenance Schedule

◆ Before every baling session — Check oil level; inspect output keyway, flange bolts, and all tube support brackets.

◆ After first 100 hours — First oil change: drain, flush, refill.

◆ Every 400 hours — Oil change (high-RPM thermal interval).

◆ Every 800 hours — Inspect output shaft bearing play; check mid-span bearing condition; examine keyway for deformation.

◆ End of straw season — Top off oil, apply corrosion inhibitor to exposed shaft surfaces, store with PTO disconnected.

Companion Products & Driveline Components

PTO Drive Shafts

Korea Ever-Power supplies heavy-duty cardan shafts rated for the EP-2250B’s 70–100 KW input torque requirements. Baler PTO shafts experience higher angular variation than tillage shafts due to the baler’s swinging drawbar geometry — matched shaft selection with correct CV joint capacity is critical for driveline longevity.

Off-Season Tillage Gearboxes

Tractors running the EP-2250B for autumn straw baling typically mount a rotary cultivator gearbox for spring and summer tillage work. Korea Ever-Power manufactures the complete range of intermediate gearboxes from 40 to 150 KW, keeping your tractor productive year-round.

Frequently Asked Questions

Customer Reviews & Field Reports