Series 4 Clamp Bolt PTO Yoke — 1-3/8″ 6 Spline (27×74.6 mm Cross)

Interfering Clamp Bolt Lock

The bolt threads into the yoke clamp collar and bites into the spline bore wall when tightened, creating a mechanically interlocked connection. Unlike a spring-loaded push-pin, the clamp bolt connection does not depend on any spring element — there is no spring to fatigue, no collar to wear, and no retention pin to lose in field conditions.

High Vibration Resistance

The bolt-secured connection maintains its clamping force under sustained vibration loads that cycle a push-pin spring mechanism. Specified for rotary cutters, forage harvesters, and high-duty-cycle implements where vibration fatigue is a concern over 300+ hour operating seasons. Retorque inspection at 50-hour intervals ensures sustained clamping force.

1-3/8″ Z6 Spline Bore

Standard 540 rpm agricultural interface — fits all Z6 PTO stubs worldwide. Induction-hardened spline bore for long-term engagement durability.

27×74.6 mm Cross-Kit Seat

Precision-machined cross-kit bearing cup bores hardened to accept 27 mm pin diameter needle-roller cross-kit cups. Cross kit (code 4.01) is shared with the Quick Release version at Series 4 — one part number covers both variants.

20CrMnTi Forged Steel Body

Drop-forged chromium-manganese-titanium alloy steel yoke body, normalised and induction-hardened at the bearing seat bores. Phosphate surface coating provides corrosion resistance in outdoor agricultural conditions. Clamp bolt collar is machined integral with the yoke body — no separate clamp ring to lose or misalign.

CE Certified — LGPD Ready

CE Declaration of Conformity and ISO 9001:2015 documentation included with every shipment. LGPD data handling compliance for Brazil import submissions. SGS third-party inspection available for contract orders.

• —Use clamp bolt when the shaft is installed at the start of the season and not disconnected daily
• —Use clamp bolt on high-vibration rotary cutters and brush hogs where push-pin spring fatigue is a concern after 300+ hours
• —Use clamp bolt for OEM factory-fit on implement drivelines that are shipped fully assembled
• —Use quick release when the tractor services multiple implements requiring daily changes

• —Series 4 cross kit: 27×74.6 mm, code 4.01
• —Identical to Series 4 Quick Release — one cross kit covers both variants
• —Cross kit is also shared with T4, L4, and G4 drive shaft assemblies

• —Series 4 clamp bolt: tighten to 25–30 Nm
• —Use a calibrated torque wrench — do not tighten by feel alone
• —Inspect and retorque at the first 10 hours and then every 50 hours in high-vibration applications
• —A loose clamp bolt allows axial yoke movement which causes spline fretting wear

• —Italian (Bondioli & Pavesi): 6.05.08
• —Weasler (North American): 103-0406
• —Sparex (European): S.7507
• —The ‘interfering bolt’ terminology in Sparex/European catalogs is the same product as ‘clamp bolt’ in North American terminology

• —No — the yoke bodies are different components and are not interchangeable
• —Order the Quick Release version (EPG-YK-QR-4-Z6) if quick release functionality is required
• —The cross kit (4.01) is shared between the two variants and is interchangeable

★★★★★

★★★★★