872765 Lower Gear | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta lower gear unit for the 2.30:1 ratio, from the Marine Propulsion group, listed for 27 applications across the TMD, AD, DP, SP, MS and TAMD series and also available as an exchange part. It supersedes 3803184 and 854641, numbers that were catalogued earlier as a gear housing and a gear under. The 1.95:1 unit is 872766, and ratio is the only safe way to choose between them: the weight published here, 98.0 kg, is nearly three times the 35.834 kg listed against 872766 and higher than any of the four complete Aquamatic drives in this run, so it should be checked before it is relied on.

🚤 Compatibility

• Engine Family: TMD, AD, DP, SP, MS, TAMD, MD

Full model list at the end of this description.

⚙️ Key Features

• For the 2.30:1 ratio
• Available as an exchange part
• Supersedes 3803184 and 854641
• 27 applications across TMD, AD, DP, SP, MS and TAMD
• The 1.95:1 alternative is 872766
• Ratio 2.30:1 (Volvo assembly listing)
• Also supersedes Volvo part number 854050

🔌 Function

Carries the drive from the vertical shaft to the propeller shaft through the final gear pair, turning the drive through ninety degrees and setting the reduction ratio.

⚠️ Common Signs of Failure

• Whine, growl or howl from the lower unit that rises with speed
• Milky or creamy gear oil, showing water has got in
• Metallic glitter or chips on the drain plug magnet
• Play or clonk felt at the propeller shaft
• Drive jumping out of gear or refusing to engage

🛠️ Service Notes

• Order by the ratio stamped on the unit, not by the published weight - the figures against the two ratios are too far apart to trust
• An exchange unit is available against this number
• Renew the gear oil, seals and anodes whenever a lower unit is fitted

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 872765 → Supersedes 3803184 → Supersedes 3803158 → Supersedes 3803115 → Supersedes 3803003 → Supersedes 877039

OEM / Related Numbers

• 854641 earlier number superseded by this part
• 3803184 earlier number superseded by this part
• 3803158 earlier number superseded by this part
• 3803115 earlier number superseded by this part
• 3803003 earlier number superseded by this part
• 877039 earlier number superseded by this part

📦 Condition

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

🔎 Full Model Compatibility

Typically suits:

• Volvo Penta 740B, 501B, 570A, 572A, 430A, 430B, 431A, 431B, 432A, 434A, 570, 500B, 430
• Volvo Penta DP-C, DP-C1, DP-D, DP-D1, DP-A, DP-A2
• Volvo Penta SP-C, SP-A2, SP-C1
• Volvo Penta AD31B
• Volvo Penta MD31A
• Volvo Penta MS4B
• Volvo Penta TAMD31B
• Volvo Penta TMD31B