# 3804709 Upper Gear Core | Genuine Volvo Penta Part

## 🔧 Product Description

Core deposit for an upper gear, in the Marine Propulsion group. It is the refundable charge raised against the old upper gear when the exchange unit is bought, and it comes back once the worn upper 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 3801709, which is the number to quote for the component itself. The other upper gear core running through this block is 3804720, and nothing published against them separates one from another, so order the number that matches the upper gear actually coming off. The lower gear cores in this block cover the foot of the leg only, and the inboard drive cores a complete drive, so check which section is being exchanged.

## ⚙️ Key Features

-   Core deposit line, not an upper gear you can fit
-   Belongs with the exchange unit, part number 3801709
-   Refunded when the old upper gear is returned
-   Not separable from the other upper 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 upper gear itself takes the drive from the engine through the transom and turns it down into the leg, carrying the shafts, bearings and the shift mechanism.

## ⚠️ Common Signs of Failure

-   This is a deposit line and has nothing to fail in itself; the signs below are what normally condemns the upper gear being exchanged
-   Whine or growl from the top of the leg that changes with engine speed
-   Shifting heavy, slow or refusing to engage cleanly one way
-   Milky or grey oil at the drain, or the oil level dropping between services
-   On strip-down, pitted or chipped gear teeth, brinelled bearings and worn shift components

## 🛠️ Service Notes

-   The charge is refunded when the worn upper 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 3801709
-   Find out how water or debris got in before the exchange unit goes on, since a failed bellows or a cut seal will drown the replacement in the same way

## 📦 Condition

-   Refundable core deposit - not a physical part

## Details

- **Price:** 11000.0 AUD
- **Vendor:** Volvo Penta
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 11000.00 AUD | In stock |

## Images

- 3804709 Upper Gear Core | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/3804709-upper-gear-core-genuine-volvo-penta)
> Updated: 2026-08-22