# 20799737 Pulley | Genuine Volvo Penta Part

## 🔧 Product Description

Rotating belt-drive component used in the generator-engine charging/regulator and belt-pulley assembly. It maintains the specified diameter, groove profile, offset and drive ratio for the connected accessory or cooling system. Application note: Pulley selection is alternator/generator-configuration specific; do not interchange with 20799739 without checking the unit identification.

## 🚤 Compatibility

Typically suits:

-   Volvo Penta TAD734GE

-   **Engine Family:** TAD
-   **HP Range:** Approximately 320 HP
-   **Year Range:** Approximately 2000s-2010s

## ⚙️ Key Features

-   Pulley for the generator-engine charging, regulator and belt-pulley drive
-   0.334 kg
-   One TAD-series application
-   Pulley 20799739 sits in the same assembly at 0.328 kg - only 6 grams apart, so weight cannot separate them

## 🔌 Function

Takes the belt drive and turns the alternator or generator rotor at the ratio set by its groove diameter.

## ⚠️ Common Signs of Failure

-   Belt squeal or a chirp that follows engine speed
-   Black belt dust collecting around the drive
-   Low or intermittent charging output
-   Groove found polished, worn or with the flanks chewed
-   Wobble or run-out as the shaft is turned, or bearing noise from behind the pulley

## 🛠️ Service Notes

-   Do not interchange with 20799739 - only 6 grams separate the two, so identify from the alternator or generator unit identification and drawing
-   Pulley 20798458 in the same group is 0.336 kg, within 2 grams of this part, so weight is no guide across any of the three
-   Renew the belt when the pulley is changed

## 🔄 Supersession & Cross Reference

### OEM / Related Numbers

-   21034749 connector
-   20834412 regulator mounting plate
-   973924 and 955271 mounting screws
-   20859762 washer
-   990940 nut
-   20459181 clamp
-   969405 socket screw
-   21259035 cable - later superseded by 22843492
-   20799737 and 20799739 pulley configurations
-   20796079 flange nut

## 📦 Condition

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

## Details

- **Price:** 399.82 AUD
- **Vendor:** Volvo Penta
- **Type:** Belts, Pulleys & Tensioners
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 399.82 AUD | In stock |

## Images

- 20799737 Pulley | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/20799737-pulley-genuine-volvo-penta)
> Updated: 2026-09-06