EP-130-1100HP Square Baler Gearbox

1 · Dual-Output Architecture — One Gearbox, Two Drive Speeds

The FK155 delivers two independently optimized shaft speeds from one 540 r/min PTO input: 1328 r/min for the main baler crankshaft drive and 1070 r/min for the follow-up automatic feed mechanism. This dual-output capability eliminates the internal countershaft and secondary chain drive that single-output square baler gearbox designs require on automatic-feed platforms, reducing machine frame complexity, weight, and the number of drivetrain components that can fail or require maintenance on a commercial baling operation.

2 · 1100 hp Peak — The Highest in This Series

With a follow-up output peak rating of 1100 hp and a primary output peak of 1080 hp, the EP-FK155 carries more than twice the peak tolerance of the previous highest-rated model in this range. At 1100 hp, this square baler gearbox is built for the worst-case kinetic energy discharge event that occurs on very large, fast-cycling automatic-feed balers when the plunger encounters a dense, fully-packed bale chamber under high-throughput field conditions. USA and Australian large baler operations running automatic-feed platforms consistently find that the drivetrain event that destroys a 550 hp-rated gearbox is the normal operating condition — not an exception — for machines at this scale.

3 · Gleason Helical Teeth — Higher Contact Ratio at Extreme Loads

Helical bevel teeth, ground to Gleason standards, provide a contact ratio typically 40–60% higher than equivalent straight teeth. At 1100 hp peak, this difference is the reason the FK155 can achieve its power rating within a housing envelope that remains installable in a large baler frame. Multiple tooth pairs share the load simultaneously, keeping per-tooth bending and contact stresses within the fatigue limits of the carburized gear material without requiring impractically large face widths. The helical tooth form also produces quieter operation — a secondary benefit for operators working long daily shifts on commercial square baler operation platforms.

4 · Large-Bore Precision Output — Ø125 mm to h6 Tolerance

The primary output bore at Ø125 mm (+0.05/−0.02 mm) — h6 tolerance — is the largest precision bore in the square baler gearbox series. This diameter accommodates the heavy shafting required at 1080 hp peak continuous output without elastic deflection that would misalign the gear mesh or overload the bearing. The tolerance band ensures that bearing installation is consistent and controlled across the production batch — a requirement that OEM machine manufacturers in the Netherlands, Canada, and South Korea include in their quality incoming inspection specifications for drivetrain components.

5 · Splined Input Hub for Heavy-Duty PTO Connection

The 6-Ø8 splined hub at Ø26 mm with +0.2/0 mm tolerance matches the input engagement geometry of heavy-duty PTO shafts used on high-horsepower agricultural tractors in the automatic baler market. A splined connection distributes input torque across six engagement points rather than a single key, dramatically reducing the peak contact stress at the input interface during 1080 hp surge events. For buyers sourcing an agri supply square baler gearbox for automatic-feed platforms, this input geometry detail directly determines compatibility with the tractor's driveline and must be confirmed before ordering.

Тұрғын үй

Ductile iron GGG50 / QT500-7, multi-rib casting with bosses at all four shaft bearing positions. The 552.5 mm overall length and bilateral shaft layout impose significant bending moments on the housing under peak torque in both stages simultaneously. Wall thicknesses and rib geometry are calculated to maintain bearing bore concentricity within 0.02 mm under rated load — the tolerance within which gear mesh geometry is preserved.

Gear Sets — Helical

20CrMnTi alloy steel, gas-carburized to case depths calculated for helical bevel contact stress at 1100 hp peak. Surface hardness HRC 58–62. Gleason Helical Teeth flanks finish-ground after heat treatment on 5-axis bevel gear grinding equipment. Contact pattern and lead deviation measured by CMM and confirmed on a hypoid gear roll-test machine before assembly sign-off.

Shafts — All Four Positions

42CrMo4 alloy steel, quenched and tempered to 310–350 HB for maximum torsional fatigue resistance. Input shaft stub: Ø26 mm splined to 6-Ø8 geometry. Primary output: Ø125 mm h6 bore. Intermediate and follow-up shafts sized individually to the torque they carry. All journals ground to h6 after heat treatment; thread forms on preload nuts rolled (not cut) for fatigue performance.

Bearings — Four Positions

Heavy-duty tapered roller bearings at all four shaft positions — input, primary output, intermediate, and follow-up output. The helical tooth geometry generates axial thrust forces at each stage that must be fully absorbed by the bearing arrangement; preload is set with precision-ground spacers and confirmed by measuring the rolling torque after assembly. Bearing dynamic load ratings are individually calculated for each shaft position under the specific torque and speed conditions at that location.

Sealing — All Shaft Exits

FKM (Viton) double-lip seals at both high-speed output positions — primary and follow-up — for resistance to the elevated temperatures that sustained high-power operation generates. Input shaft: double-lip NBR with inboard labyrinth shield against crop dust. All four seal positions include a dust lip on the atmospheric side to intercept field contamination before it reaches the primary oil-retention lip.

Quality System

ISO 9001:2015 certified. Raw material: batch-tested for chemistry, microstructure (carburization depth), and hardness. Assembled unit: CMM dimensional check, dual-stage contact pattern record, thermal run-in at rated speed for both outputs simultaneously, oil temperature stabilization measurement, and full documentation package. Test records supplied to commercial buyers as standard.

Automatic-Feed Large-Square Baler Platforms

The EP-FK155's defining application is the automatic-feed large-square baler — machines where crop is fed into the bale chamber by a driven pre-compression rotor or stuffer mechanism rather than a simple passive intake. These machines require two synchronized drive speeds from the gearbox: a higher speed for the main plunger crankshaft and a slightly lower speed for the feeder mechanism. The FK155's dual-output architecture provides exactly this, eliminating the need for an additional countershaft or chain-drive ratio stage in the machine frame. Square baler operation on automatic-feed platforms running across North American alfalfa production, UK silage baling, and Australian wheat straw recovery requires precisely this type of integrated dual-output transmission.

Ultra-High-Throughput Commercial Baling

Commercial baling contractors operating at maximum field throughput — where the baler runs continuously for 12–16 hours per day during peak harvest windows — expose their drivetrain to the highest cumulative fatigue loading in any agricultural application. At throughput rates that require plunger cycle frequencies at the upper limit of the machine design, every gearbox jam event discharges more energy than on a slower machine. The 1100 hp peak rating of the EP-FK155 provides the structural margin that keeps the drivetrain intact through the entire harvest season without the mid-season failures that undermine profitability for large commercial operations in Canada, Brazil, and Australia.

Heavy-Stalk Biomass and Energy Crop Baling

Hemp stalks, miscanthus, and densely-seeded switchgrass present the most resistant crop conditions in the square baling world. On automatic-feed platforms processing these materials at high throughput, the interplay between the feeder mechanism speed and the plunger cycle rate is critical — if they fall out of synchronization, the bale chamber overfills and the resulting jam event is far more energetic than normal. The FK155's dual-output design maintains the designed kinematic relationship between these two drive circuits automatically, reducing the probability of overfill events and the associated drivetrain shock. This makes it the appropriate new square baler gearbox for biomass processing facilities in the Netherlands, UK, and South Korea specifying new automatic-feed equipment.

OEM Automatic-Feed Machine Development

Agricultural machinery manufacturers designing new automatic-feed large-square baler platforms for the global market face a fundamental drivetrain architecture decision: single-output gearbox with internal machine countershafts, or dual-output gearbox with direct drives to both primary and secondary mechanisms. The FK155 enables the second architecture, which produces lighter, simpler machine frames with fewer wear points. OEM buyers in Brazil and South Korea developing automatic-feed balers for their domestic markets can engage our engineering team for dimensional review, gear ratio optimization for their specific plunger-to-feeder speed requirement, and documentation packages for CE marking. Custom follow-up output ratios are available to match specific machine design speeds.

Continuous-Feed Industrial Processing Lines

Industrial baling installations — straw processing for livestock bedding, biomass fuel preparation, or agricultural residue compaction for transport — increasingly use automatic-feed large-square balers in near-continuous fixed installations rather than field-mobile configurations. In these environments, the gearbox runs at sustained duty cycles without the rest periods that field baling provides between windrow passes. The FK155's thermal specification — confirmed by a stabilized oil-temperature run-in test at rated speed for both outputs — ensures it stays within operating temperature limits in this continuous-duty installation context, where intermittently-rated gearboxes would overheat and fail within a processing season.

Square Baler PTO Shaft

The FK155's 6-splined input hub requires a matching PTO shaft with the correct spline engagement geometry, rated for the full 1080 hp peak torque at the input interface. Our square baler pto shaft range includes heavy-duty wide-angle models with overrunning clutch protection sized for this power level, with yoke cross sizes and spline dimensions confirmed for compatibility with the FK155's input hub geometry and the major tractor PTO flange standards used on high-horsepower tractors in USA, UK, Australian, and European automatic-feed baler applications. Providing spline geometry and overall length requirements at enquiry stage speeds up specification confirmation.

Full Range Square Baler Machines

For buyers evaluating a complete automatic-feed baling system rather than a standalone gearbox, our full series square baler range — including hammer-claw type machines with 2200 mm picking width — is produced under the same ISO 9001:2015 certified manufacturing system as the FK155 gearbox. Machine and drivetrain from one source eliminates all interface uncertainty on shaft diameters, spline geometry, and frame mounting dimensions. This integrated supply model significantly reduces the engineering validation burden for OEM manufacturers and importers in Canada, South Korea, Brazil, and the Netherlands who need a documented, validated system rather than independently specified components.