Angular Gearbox T-19A — 28 HP Multi-Application Right-Angle Drive with 1.46:1 Ratio for Tillers, Mowers, and Spreaders

T-19A Angular Gearbox — 28 HP Right-Angle Multi-Application Drive

The T-19A is a right-angle angular gearbox that redirects PTO power through a 1.46:1 bevel gear ratio, serving as the universal drivetrain building block behind a wide range of agricultural implements. Where most gearboxes in our catalog are designed for a single machine type — one ratio for mowers, another for balers — the T-19A's combination of right-angle output, moderate ratio, and three interchangeable shaft positions makes it the standard choice for implement manufacturers who need a compact, proven right-angle drive for machines from multi-row rotary tillers to fertilizer spreaders to workshop band saws.

Manufactured as a direct replacement for the Comer Code T-19A, T-19B, and T-19G series, this gearbox replicates every mounting dimension, shaft profile, and internal gear configuration of the original. The three shaft positions — X, Y, and Z — each accept a 1-3/8 inch 6-spline connection. Position Z uses the C-type profile while X and Y use A-type, giving implement designers the ability to route the power path through the most mechanically convenient angle for their specific machine layout.

Korean agricultural equipment manufacturers, implement dealers, and farm operators across the country use this pto gearbox wherever a right-angle drive with 28 HP (20.6 kW) capacity is needed. The cast iron GG25 housing weighs 14 kg, holds 0.9 liters of 80W-90 gear oil, and is rated for 500-hour oil change intervals under normal agricultural duty.

Technical Specifications

Complete parameters for the T-19A/B/G replacement angular gearbox. Both increasing and reducing configurations share the same housing and bearings.

Why Implement Builders Choose the T-19A

Multi-Implement Applications Across Korean Agriculture

Multi-Row Rotary Tillers

Korean vegetable and rice paddy operations in Chungcheong, Jeolla, and Gyeongsang provinces use multi-row rotary tillers with 2-4 tilling rotors, each driven through its own angular gearbox. The T-19A provides the right-angle drive at each rotor position, redirecting the central PTO shaft's horizontal rotation into vertical tiller blade rotation. At 540 RPM input in increasing mode, the 788 RPM output drives tiller blades through clay-loam and sandy-loam soils at the optimum depth-per-pass rate for Korean paddy preparation.

Mower Deck Blade Drives

Rotary mower manufacturers use angular gearboxes at each blade spindle to convert horizontal driveshaft power into vertical blade rotation. The T-19A's 28 HP rating handles a single blade on mower decks up to 1.5 meters — Korean landscaping crews and park maintenance departments use these configurations on 40-50 HP tractors for amenity grass cutting in urban green spaces across Seoul, Daejeon, and Busan.

Fertilizer Spreader Mechanism Drives

Disc-type agricultural spreader gearbox applications use the reducing configuration, converting 540 RPM PTO input to approximately 370 RPM at the spinning disc. This output speed creates the 4-8 meter spread pattern needed for granular fertilizer distribution on Korean grain and vegetable fields. The angular drive changes the PTO shaft direction to match the rear-mounted disc orientation.

Workshop Band Saws and Industrial Use

Agricultural workshops and timber processing operations use the T-19A to drive band saws and belt conveyors where a right-angle axis change is needed between the PTO or electric motor and the cutting or conveying mechanism. The sub-28 HP rating covers most workshop-scale saw and conveyor applications found on Korean farms that process their own timber for fence posts, barn repairs, and firewood production.

Angular vs. Parallel Gearbox — Choosing the Right Drive Configuration

Agricultural implements use either angular (right-angle bevel) or parallel (in-line spur/helical) gearboxes depending on the required output shaft orientation. Understanding the trade-off helps operators and implement builders select correctly.

When the implement requires a change in drive axis direction — horizontal PTO shaft to vertical blade spindle, for example — an angular gearbox is the only option. When input and output shafts are on the same axis, parallel gearboxes offer slightly higher efficiency and simpler bearing arrangements. The T-19A dominates applications where multiple drive points branch off a central PTO shaft at right angles, which is why it appears in multi-row tillers, multi-spindle mowers, and combination implement systems where each working element needs its own right-angle takeoff.

Operating Conditions and Durability Factors

• ◆ Continuous Tilling Duty — On multi-row rotary tillers, the T-19A runs at near-maximum load for extended periods — 6-8 hour days during spring paddy preparation. The cast iron GG25 housing dissipates heat more effectively than aluminum alternatives, keeping oil temperature within the range that maintains proper viscosity and lubrication film thickness throughout long tilling sessions.
• ◆ Abrasive Soil Contact — Tiller-mounted angular gearboxes operate partially below ground level, exposing the housing and output shaft seal to direct soil contact. Korean paddy soils contain fine sand particles that abrade seal lips and accumulate on exposed shaft surfaces. The T-19A's double-lip output seals resist abrasive intrusion better than single-lip designs, but seal replacement at 1,500-hour intervals is recommended for tilling applications.
• ◆ Impact Loading From Stone Contact — Tiller blades striking buried stones transmit shock loads back through the output shaft into the gearbox. The GG25 cast iron housing absorbs these impacts without cracking — GG25 has higher tensile strength and shock resistance than standard grey iron. Korean agricultural fields, particularly reclaimed paddy land in Chungcheong and Gyeongsang, contain subsurface gravel that generates frequent moderate-impact events.
• ◆ Multi-Gearbox Drive Trains — When three or four T-19A units run in series on a multi-row tiller, the combined torsional load on the central driveshaft reaches 80-100 HP. Each individual gearbox operates within its 28 HP rating, but the cumulative effect means the PTO shaft and driveline components must be sized for the total system load, not the per-gearbox rating.

Field Report: Multi-Row Tiller Gearbox Replacement in Gimje

The operation had been using original Comer T-19A gearboxes on both tillers since 2016. After 8 years and approximately 5,000 operating hours, the output shaft bearings on four of the six gearboxes showed measurable play, and two units had visible oil weepage at the output seals. Replacing all six with Comer originals would have required an 8-week European import order — arriving too late for the April paddy preparation window.

The farm manager sourced six Ever-Power T-19A replacement units through a Jeonju-based dealer. All six installed on the same afternoon — bolt patterns, shaft splines, and housing envelopes matched the 2016 Comer units exactly. The spring 2025 paddy preparation season ran the six new gearboxes through 280 hours of intensive tilling (6-8 hours per day, 5 days per week for 7 weeks). Oil analysis at 280 hours showed normal iron particle levels and no bearing anomalies. The operation saved approximately 45% on the gearbox cost compared to Comer original pricing, and avoided a 6-week delay that would have compressed their planting schedule.

Pair With Compatible Drive Components

The T-19A connects to the tractor through a pto shaft rated for the total system power demand. For multi-gearbox tillers, size the PTO shaft for the combined load of all angular gearboxes in the drive train — not just one unit. A shear-bolt or friction clutch on the PTO shaft protects the gear train from overload when tiller blades strike buried objects.

Our agricultural gearbox catalog includes parallel gearboxes, speed increasers, and dedicated implement drives for applications where a right-angle configuration is not needed. Browse the full pto gearbox for sale collection.

Frequently Asked Questions

What is the difference between the T-19A, T-19B, and T-19G variants?
The three letters (A, B, G) designate different shaft configuration options offered by Comer — each positions the input and output at slightly different angles relative to the housing mounting face. The Ever-Power replacement covers all three variants through the same internal gear set and three-position shaft system. Specify your original Comer model letter when ordering to receive the correct shaft configuration.

Can I use one gearbox as both a speed increaser and reducer by changing the input shaft?
The mode is determined by which shaft serves as input and which as output. Changing from increasing to reducing mode requires reconfiguring the internal gear arrangement — a workshop procedure, not a field adjustment. Order the correct configuration for your application.

How many T-19A gearboxes can run in series on a single PTO shaft?
The limit is set by the tractor's PTO power output divided by 20.6 kW (28 HP) per gearbox. A 90 HP tractor can theoretically drive four units. In practice, driveline friction and the need for a power reserve limit most installations to three or four units. Ensure the intermediate drive shaft between gearboxes is rated for the cumulative torque of all downstream units.

Why does the T-19A use GG25 cast iron instead of aluminum?
GG25 provides superior vibration damping, heat dissipation, and impact resistance compared to aluminum alloy housings of similar wall thickness. For agricultural applications where stone impact, sustained thermal load, and corrosive soil contact are routine, cast iron's durability advantage outweighs its higher weight. The 14 kg total is still light enough for 3-point hitch implements.

What seal type does the output shaft use, and how often should it be replaced?
Double-lip nitrile rubber seals with spring-loaded inner lip. Replace every 1,500 hours for tilling applications (soil contact accelerates wear) or every 2,000 hours for mowing and spreading applications in cleaner environments. Signs of due replacement include oil weepage at the shaft exit and visible lip hardening or cracking.

What Implement Users Report

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Jeong Hae-won, Rice Farm Manager — Gimje, Jeollabuk-do, April 2025

"Replaced all six T-19A gearboxes on our two 3-row tillers. Bolt pattern matched the Comer originals exactly — installation was a matter of unbolting the old and bolting on the new. 280 hours of spring tilling with zero issues. The 45% cost savings over Comer originals let us stock two spare units for emergency mid-season replacement."

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Kim Byeong-cheol, Implement Manufacturer — Iksan, Jeollabuk-do, February 2025

"We build rotary tillers for the Korean market. Switched from importing Comer T-19A units to sourcing the Ever-Power replacement. The dimensional match is confirmed — our quality team measured all critical dimensions on a batch of 50 units against the Comer CAD drawings. No deviations outside tolerance. Lead time dropped from 12 weeks to 5 days."

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Song Jin-woo, Landscaping Company — Daejeon, Chungcheongnam-do, November 2024

"Three T-19A units on our mower deck — one per blade spindle. Two seasons of park and school ground maintenance without gearbox problems. The GG25 housing shrugs off the occasional rock strike that our workers cannot always avoid on uneven park surfaces."

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Yu Seon-mi, Agricultural Cooperative — Nonsan, Chungcheongnam-do, September 2024

"Our cooperative's 8 member farms share two rotary tillers during paddy preparation. The T-19A gearboxes see heavy use — estimated 500-600 hours per season. Oil change at 500 hours keeps them running clean. We stock 4 spare units at the cooperative warehouse for same-day replacement if one fails during the tight spring planting window."

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Ha Seung-min, Equipment Dealer — Jeonju, Jeollabuk-do, July 2024

"The T-19A is my highest-volume agricultural gearbox. Every tiller, mower, and spreader manufacturer in the region needs this unit. Moved over 200 pieces in the first year of stocking. Zero warranty returns. The three-variant compatibility (A, B, G) means one SKU covers the entire installed base of Comer-equipped implements in my territory."