EP-Square Baler PTO Shaft for Krone BIGpack 1290 / 1290HDP / 1290XC / 12130XC

The CSHR121U2WR0017G carries a factory-verified maximum torque rating of 6,750 Nm — one of the highest torque specifications in the aftermarket large square baler pto shaft category. Krone BIGpack 1290 HDP and 12130 XC machines are high-density balers that generate some of the most intense cyclic torque spikes encountered in any agricultural PTO application. Every plunger compression stroke on a fully loaded BIGpack at maximum bale density creates a torque peak that must be absorbed by the PTO shaft without accumulating fatigue damage. A shaft rated to 6,750 Nm provides the structural safety margin that sustained high-density baling demands, particularly during the long daily operating windows of contract baling in wheat and barley regions across Europe, Australia, and the Americas.

The CAT 7/8 SFT SH Series Constant Velocity (CV) joint at the tractor-side end of this square baler pto shaft is the central engineering differentiator from standard double-cross-joint configurations. A CV joint transmits torque at a constant angular velocity regardless of the operating angle between tractor and baler — eliminating the velocity variation that a standard u-joint introduces at working angles above approximately 7 degrees. For BIGpack operators who work on irregular terrain, tight headlands, or hillside fields, the CV joint means the baler input shaft receives smooth, pulse-free power even when the tractor-to-baler angle is large, reducing the cyclic loading on the baler's flywheel shaft and input gearbox bearings that standard joints would impose.

The Krone BIGpack 1290 XC and 12130 XC are among the highest-throughput large square balers on the market, typically paired with tractors in the 180–280 HP range running at 1,000 rpm PTO. This square baler pto shaft is rated for operation at 200 HP and beyond at 1,000 rpm, giving it the power capacity to cover the full spectrum of tractors used with this baler series — from the lower end of the BIGpack pairing range up to the largest modern high-HP tractors used in North American and Eastern European high-output baling operations. Any tractor drive shaft under-specified for the actual tractor power in use will fail through cross-joint fatigue within a season; this unit provides genuine headroom above the 200 HP threshold.

The tractor-side CV joint assembly is rated to operate at up to 75 degrees of angular displacement from the shaft centreline — a specification visible in both engineering drawings. This extreme angle capability is not needed in normal straight-line baling but becomes critical during tight headland turns on smaller fields, where the tractor may need to turn sharply while the PTO remains engaged to keep the baler flywheel running at operational speed. A standard double-cross-joint shaft would bind or transmit severe velocity pulses at angles above 25–30 degrees; the 75-degree CV joint rating of this assembly provides the flexibility to handle any headland geometry likely to be encountered in practical field use across Europe, the UK, and North America.

While the standard telescoping tube configuration is adequate for typical baling conditions, the splined tube variant of this pto shaft baler assembly offers meaningfully extended service life in high-intensity use. The 45 mm x 16 spline profile (as shown in the second engineering drawing) provides a greater load-bearing contact area across the sliding interface compared to a profile-bore arrangement, reducing the local surface pressure at the tube contact zone and slowing the wear rate under sustained high-torque telescoping action. For large contractors running BIGpack machines at or near maximum capacity across extended daily shifts through peak harvest seasons, the splined version is the investment that pays back through fewer mid-season replacement events.

Length & Telescoping Range

The overall minimum closed length of 1,669 mm and a working telescoping section minimum of 1,210 mm give this shaft the length needed to span the tractor-to-baler distance on the large-frame tractors paired with the Krone BIGpack range. The 48"-to-54" working range in the imperial drawing corresponds to the typical distance variation encountered on BIGpack operations during headland turns and field undulations. Measuring the correct tractor pto shaft length for a specific tractor-baler combination before ordering ensures the shaft telescopes freely throughout the full working range without bottoming out or over-extending.

Spline Interface Options

Both 1 3/4" Z=20 and 1 3/4" Z=6 tractor-side spline options are available, covering the full range of large-frame tractors used with the BIGpack series in Europe, North America, and Australia. The 45 mm x 16 spline profile in the splined tube version provides a substantially larger contact area across the telescoping interface than a standard profile-bore design — the key engineering advantage that justifies the splined version for operators in high-intensity, extended-duration baling contexts. The square baler pto shaft components in both versions are dimensionally matched to the BIGpack input shaft specification to ensure correct engagement depth and spline contact at both ends of the assembly.

Safety Guard System

The full-coverage safety guard — Ø233 mm at the tractor-side CV joint and Ø201 mm at the baler-side cross-joint — meets EN 12965 requirements for PTO shaft guards in EU and UK markets, and satisfies the equivalent ASABE S203 requirements for North American agricultural operations. Two safety retaining chains are visible in the engineering drawing, securing the guard to both the tractor and baler to prevent co-rotation. The larger-diameter guard at the CV joint end reflects the physically larger CV joint housing — a practical consequence of the higher torque capacity and greater joint complexity of the constant velocity design relative to a simple cross-joint.

Universal Joints at Baler End

The baler-side connection uses a standard heavy-duty cross-joint (u-joint) rather than a second CV joint, which is the typical design arrangement for this application — the baler input shaft angle relative to the shaft body is smaller and more consistent than the tractor-side angle, making the additional cost and complexity of a second CV joint unnecessary. The baler-side pto shaft u joint is dimensioned for the 6,750 Nm rated torque of the assembly, with cross-journal size and needle roller bearing cup specifications chosen for the cyclic high-load duty cycle of BIGpack operation.

Locking Groove Mechanism

The locking grooves visible in the Drawing 2 configuration allow the telescoping tube to be locked at a fixed length for transport or storage, preventing the inner tube from extending under gravity when the shaft is disconnected and stored horizontally. The 1,219 mm (48") closed-groove length and the 33" fully collapsed dimension bracket the range of storage and transport configurations the operator needs to accommodate. The reference tooth marking on the outer tube aids re-engagement in the correct angular position when reconnecting the telescoping sections after cleaning or maintenance.

Tractor Compatibility — BIGpack Fleet Coverage

Krone BIGpack 1290, 1290 HDP, 1290 XC, and 12130 XC machines are paired with tractors ranging from 180 HP mid-size to 350 HP+ articulated or large-frame units across global markets. The CSHR121U2WR0017G's 200 HP+ at 1,000 rpm rating and 6,750 Nm torque capacity cover the full tractor size range used with this baler series. The 1 3/4" Z=20 and Z=6 spline options on the tractor side ensure compatibility with the major tractor brands used with these balers in Germany, France, the UK, the US midwest, and Australia without requiring adaptor collars or shaft modification.

How to Measure the PTO Shaft Length

To confirm the correct square baler pto shaft length for your specific tractor-BIGpack combination: hitch the baler to the tractor in the normal working position on level ground. Measure the straight-line distance from the tractor PTO stub face to the baler gearbox input stub face. This is the working length. The shaft must compress to approximately 75% of this distance to accommodate full headland turns (the 1,219 mm locking groove dimension is a reference). Verify that the 54" extended length provides the required clearance at maximum extension. Confirm the tractor PTO stub spline count (Z=20 or Z=6) and diameter (1 3/4") before ordering to select the correct tractor-side yoke configuration.

How to Attach the PTO Shaft to the BIGpack

Before connecting the shaft, ensure the tractor is parked, the engine is off, and the PTO is disengaged. Align the tractor-side CV joint yoke with the tractor PTO stub — the splines must align before the yoke can slide on. Rotate slightly until the splines engage, then push fully home until the locking collar clicks into the retention groove on the stub. Secure the tractor-side guard chain to the tractor drawbar or designated anchor point. Connect the baler-side yoke to the Krone BIGpack input shaft in the same way, engaging the locking collar and securing the baler-side chain to the baler frame anchor.

How to Remove the PTO Shaft from the Tractor

Safe removal of the pto shaft begins with stopping the tractor completely — engine off, PTO disengaged, parking brake engaged, and all rotation confirmed to have ceased. Disengage the guard chains at both tractor and baler anchor points. At the tractor PTO stub, press or pull the CV joint yoke's spring-loaded locking collar to release the retention engagement, then pull the yoke clear of the stub splines. The baler-side cross-joint yoke is released at the Krone BIGpack input shaft in the same way. When removing the shaft from a warm baler after a working session, be aware that CV joint housings can retain heat for extended periods — use gloves when handling the CV joint end for the first few minutes after PTO disengagement. Store the shaft horizontally with the locking grooves engaged to prevent unintended extension.

High-Density Straw Baling — Germany, France & UK

The Krone BIGpack HDP models are specifically engineered for maximum bale density, making them a preferred choice for straw export markets across Germany, France, and the UK, where bale density directly affects transport economics. High-density baling places the greatest cyclic torque demand on the pto shaft baler drivetrain — the 6,750 Nm rated CSHR121U2WR0017G provides the structural margin needed for sustained HDP operation across long daily contract shifts during harvest. Dealers serving BIGpack HDP fleet operators in these markets benefit from stocking this shaft ahead of the harvest season when replacement demand peaks and lead time tolerance is minimal.

Hay & Haylage Baling — Australia & New Zealand

Large square balers including the Krone BIGpack 1290 XC are used for high-value export hay production across Australia's hay belt and New Zealand's pastoral regions. The variable moisture content of hay crops — from 15% in well-cured lucerne to over 35% in haylage — creates highly variable torque demand on the baler PTO drivetrain. The CV joint design of this shaft maintains smooth, consistent power delivery regardless of how abruptly the torque demand changes as the baler moves from light to dense crop zones across the paddock, protecting both the baler input gearbox and the tractor PTO from the velocity pulses that a standard joint would introduce under variable loading.

Corn Stover & Biomass Collection — US Midwest & Canada

Krone BIGpack machines are widely used for corn stover and biomass collection across Iowa, Illinois, Indiana, and the Canadian prairie provinces. Stover is an abrasive, high-volume crop that places sustained load on the baler drivetrain across extended daily operating windows. The CSHR121U2WR0017G's 200 HP+ at 1,000 rpm rating covers the large-frame tractors — typically 225–300 HP — used in high-volume stover collection contracts. The replacement pto shaft for this application needs to be in dealer stock ahead of the autumn stover harvest window, when lead times for urgent orders become problematic.

Energy Grass & Reed Baling — Netherlands & Poland

Large square balers are the preferred format for miscanthus, reed canary grass, and Phragmites baling for combustion biomass markets across the Netherlands, Poland, and Baltic region. These crops are among the most demanding for baler drivetrains — fibrous, tangled stems with highly variable feed rates create torque spikes that require both the 6,750 Nm capacity and the overload protection behaviour that the slip clutch or shear pin options on this shaft provide.

Contractor Fleet Service & Dealer Aftermarket

Krone BIGpack 1290 and 12130 series machines are widely distributed through agricultural contractor fleets across Europe, North America, and Australasia. Dealers serving these contractors need the CSHR121U2WR0017G in stock with both tractor-side spline options before the baling season to cover urgent replacement demand. A BIGpack breakdown during peak harvest represents a significant daily revenue loss to the contractor — fast parts availability is the dealer service capability that builds and retains contractor loyalty.

Agricultural Gearbox

The CSHR121U2WR0017G drives the Krone BIGpack input gearbox — and when the gearbox input bearings or shaft seals require replacement concurrently with a PTO shaft service, sourcing both from the same supplier streamlines the repair. Our Agricultural Gearbox range covers the torque classes and PTO input specifications used across large square baler drivetrains, with ISO 9001:2015 quality documentation available for both components.

Universal Joint

The baler-side universal joint in the CSHR121U2WR0017G assembly is the component most likely to require replacement before the rest of the shaft assembly reaches end of service life. A correctly dimensioned replacement u joint for pto shaft matched to the baler-side cross-journal specification allows worn cross-journals to be replaced in the field or workshop without scrapping the complete shaft — an important cost and lead-time advantage during harvest-season breakdowns.