# 3804725 Lower Gear Core | Genuine Volvo Penta Part

## 🔧 Product Description

Core deposit for a lower gear, in the Marine Propulsion group. It is the refundable charge raised against the old lower gear when the exchange unit is bought, and it comes back once the worn lower gear 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 3801725, which is the number to quote for the component itself. It is one of 7 lower gear cores running through this block, and nothing published against them separates one from another, so order the number that matches the lower gear actually coming off rather than working from the description. The upper gear cores 3804709 and 3804720 cover the section above the cavitation plate, and the inboard drive cores a complete drive.

## ⚙️ Key Features

-   Core deposit line, not a lower gear you can fit
-   Belongs with the exchange unit, part number 3801725
-   Refunded when the old lower gear is returned
-   Not separable from the other lower gear cores here, so order by part number
-   Marine Propulsion group

## 🔌 Function

As a line item it carries the refundable core charge on the exchange; the lower gear itself turns the drive through ninety degrees at the foot of the leg and carries the propeller shaft with its bearings and seals.

## ⚠️ Common Signs of Failure

-   This is a deposit line and has nothing to fail in itself; the signs below are what normally condemns the lower gear being exchanged
-   Whine or growl from the lower unit that changes with engine speed or with the gear selected
-   Milky or grey gear oil at the drain, or water standing in the leg after a season afloat
-   Vibration felt through the hull, or play found at the propeller shaft
-   On strip-down, pitted or chipped gear teeth, brinelled bearings and hardened or cut shaft seals

## 🛠️ Service Notes

-   The charge is refunded when the worn lower gear 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 3801725
-   Find out how the water got in before the exchange unit goes on, since a cut propeller-shaft seal or a damaged carrier will drown the replacement in the same way

## 📦 Condition

-   Refundable core deposit - not a physical part

## Details

- **Price:** 26400.0 AUD
- **Vendor:** Volvo Penta
- **Type:** Exchange & Reman Units
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 26400.00 AUD | In stock |

## Images

- 3804725 Lower Gear Core | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/3804725-lower-gear-core-genuine-volvo-penta)
> Updated: 2026-10-08