20799739 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 20799737 without checking the unit identification.

🚤 Compatibility

Typically suits:

• Volvo Penta TAD560VE
• Volvo Penta TAD561VE
• Volvo Penta TAD752GE
• Volvo Penta TAD753GE
• Volvo Penta TAD754GE
• Volvo Penta TAD765VE
• Volvo Penta TAD764VE
• Volvo Penta TAD763VE
• Volvo Penta TAD762VE
• Volvo Penta TAD761VE

• 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
• 0.328 kg
• 10 applications across TAD-series engines
• Pulley 20799737 sits in the same assembly at 0.334 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 20799737 - 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, 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• 21259035 cable - later superseded by 22843492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