820637 Gear | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta gear from the Engine group, weighing 1.338 kg and listed for 47 applications across the MD, TMD, D, TD, AQD and TAMD series. It supersedes part numbers 820957, 823974 and 821192.

🚤 Compatibility

• Engine Family: MD, TMD, D, TD, AQD, TAMD, TAD

Full model list at the end of this description.

⚙️ Key Features

• Supersedes 820957, 823974 and 821192
• 1.338 kg
• 47 applications across six engine series
• The note points to catalogue group 2A for the surrounding assembly

🔌 Function

Transmits drive between two shafts, its teeth setting the speed and direction of the driven component.

⚠️ Common Signs of Failure

• Whine or growl that rises and falls with engine speed
• Chipped, pitted or broken teeth
• A bright polished wear band down one tooth flank
• Metal debris in the oil or clinging to the magnetic plug
• Excessive backlash felt when the gear is rocked by hand

🛠️ Service Notes

• Number 823974 is also listed among the numbers superseded by seawater pump 822787, so confirm which assembly the old number came off before ordering
• If the tooth flanks are pitted, inspect the meshing gear and its bearings at the same time

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 820637 → Supersedes 820957

OEM / Related Numbers

• 820957 earlier number superseded by this part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 TAMD122A, TAMD122A/C, TAMD122D, TAMD122P-A, TAMD122P-B, TAMD122P-C
• Volvo Penta TAMD70B, TAMD70E, TAMD70C, TAMD70D
• Volvo Penta AQD70B, AQD70D, AQD70C
• Volvo Penta MD100A, MD100B, MD100B-CC
• Volvo Penta TAMD60A, TAMD60B, TAMD60C
• Volvo Penta TAMD72A, TAMD72P-A, TAMD72WJ-A
• Volvo Penta MD70B, MD70C
• Volvo Penta TAMD102A, TAMD102D
• Volvo Penta TAMD120A, TAMD120B
• Volvo Penta TAMD71B, TAMD71A
• Volvo Penta TMD100A, TMD100C
• Volvo Penta TMD120A, TMD120B
• Volvo Penta TMD70C, TMD70B
• Volvo Penta D70CHC
• Volvo Penta MD120A
• Volvo Penta TAD121CHC
• Volvo Penta TAMD103A
• Volvo Penta TAMD121D
• Volvo Penta TAMD61A
• Volvo Penta TAMD62A
• Volvo Penta TD70CHC
• Volvo Penta TMD102A
• Volvo Penta TMD121C
• Volvo Penta TMD122A