23778956 Lower Gear | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta lower gear unit from the Marine Propulsion group, weighing 51.001 kg. Six lower gears are listed together in this run, 23778954, 23778956, 23778957, 23778958, 23778959 and 23778963, and this is the only one of them carrying a published weight, so nothing in the listing separates the other five. Order strictly by part number.

⚙️ Key Features

• 51.001 kg
• Marine Propulsion group
• One of six lower gears listed in this run
• Only member of that group with a published weight
• Heavy assembly needing mechanical lifting

🔌 Function

Takes the drive from the vertical shaft through the bevel gears to the propeller shaft, setting the direction of rotation and the final gear reduction.

⚠️ Common Signs of Failure

• Whining or growling from the drive that changes with speed
• Milky or emulsified oil drained from the drive
• Metal particles on the drain plug magnet
• Vibration or a knock felt under load
• Drive not taking up properly in forward or astern

🛠️ Service Notes

• At 51 kg this is a mechanical lift, not a manual one, and must be supported properly while it is off the boat
• Renew the shaft seals, gaskets and drive oil at the same time, and inspect the propeller shaft and bearings for the wear that caused the failure
• Confirm the number against the parts listing for your drive, as the six lower gears listed here share one name and are not interchangeable

📦 Condition

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