# 21735439 Gear | Genuine Volvo Penta Part

## 🔧 Product Description

A genuine Volvo Penta timing / fan-hub drive gear used in Volvo Penta TAD8 timing-gear and auxiliary-drive systems. It is manufactured to the factory dimensions and operating specification for the catalogued installation.

## 🚤 Compatibility

Typically suits:

-   Volvo Penta TAD840GE
-   Volvo Penta TAD841-43GE
-   Volvo Penta D8A2-A MP
-   Volvo Penta TAD853VE
-   Volvo Penta TAD851-53GE
-   Volvo Penta TAD880-82GE
-   Volvo Penta D8A5-A MH
-   Volvo Penta D8A6-A MH
-   Volvo Penta D8A5-A MG
-   Volvo Penta D8A6-A MG
-   Volvo Penta TAD880-84VE
-   Volvo Penta D8A4-A MP
-   Volvo Penta D8A1-A MP
-   Volvo Penta TAD840-43VE
-   Volvo Penta TAD850-52VE
-   Volvo Penta TAD870-73VE
-   Volvo Penta D8A3-A MP
-   Volvo Penta TAD840GE-B
-   Volvo Penta TADH880-82GE
-   Volvo Penta TADH880-84VE

-   **Engine Family:** TAD, D, TADH
-   **HP Range:** Approximately 250-400 HP
-   **Year Range:** Approximately 2010 - 2021

## ⚙️ Key Features

-   Engine group timing and drive gear, 0.773 kg
-   Listed for 20 applications across TAD, D and TADH series engines

## 🔌 Function

Transmits drive within the engine's timing gear train, passing rotation between the crankshaft gear and a driven component at the designed ratio and phase.

## ⚠️ Common Signs of Failure

-   Gear whine or a rattle from the timing end that tracks engine speed
-   Noise that changes when the driven accessory is loaded
-   Fine metallic debris in the oil or on the sump magnet
-   Pitted, chipped or unevenly worn teeth and slack backlash found on inspection

## 🛠️ Service Notes

-   Three gears share this number group: 21735434 at 0.538 kg and 21735437 at 0.907 kg, the latter specific to engines without an air compressor, so order by number
-   Renew a worn gear together with the gear it meshes against, as a damaged tooth form quickly ruins a new partner

## 🔄 Supersession & Cross Reference

### OEM / Related Numbers

-   21736277 - associated hub
-   975206 - mounting screws

## 📦 Condition

-   Genuine Volvo Penta part
-   Brand new
-   Supplied in original or equivalent packaging

## Details

- **Price:** 570.11 AUD
- **Vendor:** Volvo Penta
- **Type:** Transmission & Gearbox
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 570.11 AUD | In stock |

## Images

- 21735439 Gear | Genuine Volvo Penta Part
- 21735439 Gear | Genuine Volvo Penta Part - photo 2 of 2

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/21735439-gear-genuine-volvo-penta)
> Updated: 2026-10-12