원형 베일러 PTO 기어박스 T-304A | 1:3 비율, 고하중용

Round Baler PTO Gearbox Overview

The T-304A is a heavy-duty PTO 기어박스 engineered for round baler equipment and other high-torque agricultural applications. With a 1:3 speed-increasing ratio, this unit converts the tractor's 540 RPM PTO output to approximately 1,620 RPM at the driven end, matching the speed requirements of baler pickup mechanisms and compression rollers. The maximum output torque rating of 94.5 daNm places this gearbox firmly in the heavy-duty class — well above the lighter units used on mowers and spreaders — reflecting the sustained loading that round balers impose during hay and straw baling operations.

Manufactured as a direct replacement for the Comer Industries T-304A, this 농업용 PTO 기어박스 matches the original mounting dimensions, shaft specifications (1 3/8-inch, 6-spline input), and bolt patterns. The cast iron housing provides the structural rigidity needed to contain the higher bearing loads that come with the 94.5 daNm torque rating. Oil capacity is 1.1 litres — larger than smaller-frame gearboxes — to maintain adequate lubrication under the sustained, high-load operating conditions typical of baling work. The gearbox ships without oil, allowing operators to fill with SAE 80W-90 gear lubricant before first use.

기술 사양

Verified performance and dimensional data for the T-304A 트랙터 PTO 기어박스. All values correspond to standard 540 RPM input conditions.

How the Round Baler Gearbox Works

In a round baling operation, the tractor PTO drives a driveshaft at 540 RPM. That shaft connects to this gearbox through a 1 3/8-inch, 6-spline input coupling. Inside the cast iron housing, a spiral bevel gear pair redirects the power 90 degrees and multiplies the speed by a factor of three. The output shaft, now spinning at roughly 1,620 RPM, feeds into the baler's pickup mechanism, compression belts, or roller chain drive depending on the baler model.

The torque demands on a 원형 베일러 PTO 기어박스 are substantially higher than on mower or spreader gearboxes. As the bale chamber fills, the resistance on the compression rollers increases steadily until the bale reaches its target diameter and density. At peak compression, the gearbox may see sustained loads near its 94.5 daNm output torque limit for extended periods — unlike a flail mower where loads are intermittent and impact-driven. This is why the T-304A uses a larger housing, heavier-duty bearings, and a 1.1-litre oil reservoir compared to lighter models in the same ratio family. The larger oil volume dissipates heat more effectively during the sustained high-load baling cycles that can last 30-60 minutes per field pass.

Application Scenarios

Round Hay Baling

The primary application for this gearbox. Round balers compress cut hay, straw, or grass into cylindrical bales ranging from 1.2 m to 1.8 m in diameter. The PTO 기어박스 delivers the speed and torque needed to drive the baler's belt or chain system through the full compression cycle — from an empty chamber to a tightly packed 400-500 kg bale — without stalling or overheating.

Straw and Crop Residue Baling

After grain harvesting, round balers collect and compress rice straw, wheat straw, and corn stalks. This material is denser and more abrasive than grass hay, placing higher demands on the gearbox. The T-304A's 94.5 daNm torque rating provides the necessary margin for these tougher materials.

Silage Wrapping Operations

Some combined baler-wrapper machines use gearboxes in this power class to drive both the baling mechanism and the wrapping turntable. The 1:3 ratio delivers adequate speed for the wrapper while the high torque handles the compression rollers simultaneously.

Operating Environment and Conditions

Round baling is a high-duty-cycle operation. The PTO 기어박스 runs at or near full rated load for the duration of each bale, typically 3-5 minutes, with only brief pauses between bales for the wrapping or ejection cycle. On a typical Korean hay farm, a baler may produce 50-100 bales per day during peak season, meaning the gearbox accumulates 4-8 hours of near-continuous heavy loading daily. The T-304A is rated for this kind of sustained service — the 1.1-litre oil reservoir, combined with the heat-dissipating properties of the cast iron housing, keeps operating temperatures within safe limits even during extended baling sessions in summer ambient temperatures of 30-35 degrees Celsius.

Dust is a constant factor in baling environments. Chaff, fine grass particles, and soil dust settle on the gearbox exterior during every field pass. The double-lip shaft seals prevent contamination from entering the bearing cavity, but operators should periodically wipe down the housing to prevent debris accumulation around the breather vent, which could restrict pressure equalization and lead to seal leakage.

Related and Companion Products

Round baler driveshafts operate under higher sustained torque than mower or spreader shafts. A correctly rated PTO shaft with proper guard coverage is a safety requirement, not an optional accessory. Korea Ever-Power supplies wide-angle PTO shafts with the torque ratings needed for baler service. For the full range of PTO shaft assemblies, visit our shaft catalogue. For other 농업용 기어박스 models, see our complete product line.

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