3857012 Gear | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta gear from the Marine Propulsion group, weighing 0.941 kg and listed for 42 applications across the SX, AD, D, TMD, BB and DP series. It supersedes part number 3852410, catalogued earlier as a shift mechanism, so what was once listed as a mechanism is now supplied as this gear.

⚙️ Key Features

• 0.941 kg
• 42 applications across six series
• Supersedes 3852410, catalogued earlier as a shift mechanism

🔌 Function

Meshes with its partner to pass drive through the assembly, its teeth carrying the full load the shaft transmits.

⚠️ Common Signs of Failure

• Whine or howl that changes with load
• Teeth pitted, chipped or spalled along the flanks
• Wear stepped unevenly across the tooth face
• Clunk or backlash felt as drive is taken up
• Bright metal or glitter in the oil

🛠️ Service Notes

• The number it replaces was catalogued as a shift mechanism, so on an older unit check what is actually fitted before ordering
• Gears wear as a pair — inspect the mating gear and the shift components, and renew the oil on reassembly

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 3857012 → Supersedes 3852410 → Supersedes 850309

OEM / Related Numbers

• 3852410 earlier number superseded by this part
• 850309 earlier number superseded by this part

📦 Condition

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