Ariens 9478400 Pinion Sprocket 7 Tooth Spline Bore

Product Description

The ARIENS 9478400 is a pinion sprocket designed for use in Ariens lawn and garden equipment drive systems. This 7-tooth sprocket features a spline bore configuration, allowing it to seat securely on a splined shaft within the drivetrain. Pinion sprockets transfer rotational force from a drive shaft to a chain or gear assembly, making them a critical component in the power transmission path. Replacement is typically performed by a qualified equipment technician when the original sprocket shows wear, tooth damage, or slippage under load.

This sprocket is suited for Ariens lawn and garden equipment that uses a spline-shaft pinion drive arrangement. It is commonly found in the drivetrain assemblies of walk-behind and self-propelled units. Technicians replacing worn or broken drive components during seasonal maintenance or after impact damage will find this a direct OEM-equivalent part. Consult the equipment service manual or parts diagram to confirm fitment before installation.

Key Features

• 7-tooth pinion configuration for precise chain or gear engagement
• Spline bore design locks securely onto splined drive shafts without slipping
• OEM Ariens part number ensures correct form, fit, and function
• Designed for lawn and garden equipment drivetrain applications

Compatibility

Designed as an OEM-style replacement pinion sprocket for Ariens lawn and garden equipment drivetrain assemblies. Verify fitment against the equipment model number and parts diagram prior to ordering.

Installation Notes

Installation should be performed by a qualified equipment technician familiar with small engine and drivetrain service. Disconnect the spark plug wire and ensure the unit is fully powered down before accessing any drivetrain components. Inspect the mating splined shaft for wear or damage before installing the new sprocket. Refer to the Ariens service manual for the specific disassembly sequence and any fastener requirements applicable to your equipment model.