3855907 Gear Under | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta lower gear unit for the 2.11:1 and 1.78:1 ratio drives, from the Marine Propulsion group, weighing 32.205 kg and listed for 6 applications across the DP drive family. It supersedes part numbers 3803266 and 3801183, both catalogued earlier as remanufactured lower gears.

🚤 Compatibility

Typically suits:

• Volvo Penta DP-S
• Volvo Penta DP-S1
• Volvo Penta DP-SM
• Volvo Penta DP-SMTD
• Volvo Penta DP-SMTD1
• Volvo Penta DP-SMTD3

• Engine Family: DP

⚙️ Key Features

• For the 2.11:1 and 1.78:1 ratios
• 32.205 kg
• Supersedes 3803266 and 3801183
• 6 applications across the DP drive family

🔌 Function

Takes the drive from the vertical shaft round to the propeller shafts and provides the final reduction ratio.

⚠️ Common Signs of Failure

• Rising whine or howl from the drive under load
• Emulsified or metallic oil drained from the unit
• Water contamination in the gear oil
• Notchy feel or backlash at the propeller shafts
• Broken or spalled teeth found once the unit is opened

🛠️ Service Notes

• This number covers two ratios, 2.11:1 and 1.78:1, so check the drive's ratio before ordering and compare against 3855906 for 1.68:1
• The superseded numbers were listed as remanufactured lower gears, so confirm whether a new or an exchange unit is supplied against this number
• At 32.205 kg it is the heaviest item in this range and needs lifting gear and freight handling

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 3855907 → Supersedes 3803266

OEM / Related Numbers

• 3801183 earlier number superseded by this part
• 3803266 earlier number superseded by this part

📦 Condition

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