21122907 Hub | Genuine Volvo Penta Part

🔧 Product Description

Genuine machined hub used in the Volvo Penta drive or transmission assembly that specifies part number 21122907. The available data does not establish a safe drive model, so the hub must be matched by spline, bore, mounting geometry and assembly number.

⚙️ Key Features

• Genuine Volvo Penta torque-transmission component
• Precision-machined bore or spline
• Maintains concentric alignment
• Designed for marine propulsion loading
• drive or transmission fitment

🔌 Function

The hub connects rotating components and transmits torque while maintaining alignment.

⚠️ Common Signs of Failure

• Worn or stripped splines
• Excess rotational backlash
• Fretting or metal powder
• Cracking around the bore

🛠️ Service Notes

• Get the hub off with the correct puller rather than levering or hammering it; a hub driven off or on is enough to damage the shaft, the bearing behind it and the hub itself
• Clean and inspect the shaft, keyway or taper and check for scoring, wear steps and fretting; a hub will not run true on a damaged seat and the fault will come straight back
• Inspect and renew the seal that runs on or behind the hub while access is good, and check the sealing surface for a wear groove
• Draw the hub on square, fully home to the position the workshop manual for your engine gives, and tighten the retaining fastener to the manual figure with any specified locking method
• Check the drive belt alignment and run-out after fitting, then run the engine and watch for wobble, noise or a belt tracking off to one side

📦 Condition

• Genuine Volvo Penta part
• Brand new
• Supplied in original or equivalent packaging