3804993 Servo Unit Core | Genuine Volvo Penta Part

🔧 Product Description

Core deposit for a servo unit, from the Ignition and Control Systems group. It is the refundable charge raised against the old servo unit when the exchange unit is bought, and it comes back once the worn servo unit is returned. The line itself is an accounting entry rather than a part, so nothing ships against it on its own. Under Volvo Penta's core numbering the exchange unit it belongs to takes part number 3801993, which is the number to quote for the servo unit itself. Servo unit core 3804994 sits alongside it in this run with no weight, fitment or note published against either, so nothing separates the two here - order the number that matches the servo unit actually coming off, or the number the exchange unit was quoted against.

⚙️ Key Features

• Core deposit line, not a servo unit you can fit
• Belongs with the exchange unit, part number 3801993
• Refunded when the old servo unit is returned
• Not separable from servo unit core 3804994, so order by part number
• Ignition and Control Systems group

🔌 Function

As a line item it carries the refundable core charge on the exchange; the servo unit itself turns the control signal it is sent into physical movement, driving and then holding the position it has been asked for against the load working back through the linkage.

⚠️ Common Signs of Failure

• This is a deposit line and has nothing to fail in itself; the signs below are what normally condemns the servo unit being exchanged
• Slow, lazy or dead response to a control input, or movement that only comes after a delay
• The unit hunting, buzzing or stepping back and forth instead of settling on a position
• Position drifting away from the demand on its own, so what the helm asks for and what the engine does no longer agree
• Stored control faults that come straight back after the wiring, connectors and earths have been proved good

🛠️ Service Notes

• The charge is refunded when the worn servo unit is returned, so keep the old unit and send it back rather than scrapping it
• Ordering this number on its own supplies no part - it goes on the order beside the exchange unit, part number 3801993
• Check the linkage it drives for stiffness, wear or binding before condemning the unit, as a tight linkage will overload and kill the replacement in the same way

📦 Condition

• Refundable core deposit - not a physical part