Starter Drive for Agritalia (Carraro) Atlas Copco 9 T CW 10 SPL 54-9121

One loud click and no crank usually points at the solenoid or the battery connection. Rapid clicking is nearly always a flat battery or a bad ground, not the starter. A whirring noise with no engine turning means the drive gear is not engaging. Silence with good battery voltage points at the ignition switch, a relay or the starter itself.

Before replacing anything, load test the battery and clean both cable ends. A poor ground imitates a failed starter closely enough to sell a lot of unnecessary parts.

The tooth count is the number of teeth on the drive gear that meets the engine flywheel. It has to match the flywheel it engages. A starter that is otherwise identical but carries a different tooth count will not mesh correctly and will chew the ring gear.

Count the teeth on your old drive gear if you are unsure. Our glossary explains the rest of the spec vocabulary.

A gear reduction starter puts a small gearbox between the motor and the drive. It spins a smaller, lighter motor faster and gears it down for torque, so you get more cranking power for less weight and less current draw. Direct drive starters skip the gearbox and are simpler but heavier for the same output.

The two are not interchangeable by eye. Match the mounting and the part number, not the look.

New. Every starter we list is a new unit, not a rebuilt core, and it carries a one year warranty. There is no core to return and no deposit to chase.

Orders leave within three business days. Ships from USA. You can read the full terms in our shipping policy, and returns are covered in the return and refund policy.

Returns are accepted within the window set out in our return and refund policy,and a restocking fee applies unless the part is defective or we made the error. A unit that has been installed or used cannot be returned, so it is worth confirming fitment by part number before you fit it.