955886 Castle Nut | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta castle nut of the early type for the 1.98:1 reverse gear ratio, weighing 0.027 kg and listed for 33 applications across the MD, TMD, TAMD and THAMD families. It supersedes 951778.

🚤 Compatibility

• Engine Family: MD, TMD, TAMD, THAMD

Full model list at the end of this description.

⚙️ Key Features

• For the 1.98:1 reverse gear ratio
• Early type
• 0.027 kg
• Supersedes 951778
• Quantity varies by assembly, most commonly six

🔌 Function

Retains the reverse gear shaft or pin and is locked by a cotter pin through its slots.

⚠️ Common Signs of Failure

• Cotter pin sheared or missing
• Slots spread or burred where the pin passes
• Play developing at the retained joint
• Thread pulled or stretched

🛠️ Service Notes

• Castle nut 955887 is the equivalent for the 3.00:1 ratio - confirm the reverse gear ratio before ordering, because the two are different sizes
• Fit a new cotter pin whenever the nut is disturbed

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 955886 → Supersedes 951778

OEM / Related Numbers

• 951778 earlier number superseded by this part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 TAMD70B, TAMD70E, TAMD70C, TAMD70D
• Volvo Penta MD100A, MD100B, MD100B-CC
• Volvo Penta TAMD122A, TAMD122A/C, TAMD122D
• Volvo Penta TAMD72A, TAMD72P-A, TAMD72WJ-A
• Volvo Penta MD70B, MD70C
• Volvo Penta TAMD102A, TAMD102D
• Volvo Penta TAMD60B, TAMD60C
• Volvo Penta TAMD71B, TAMD71A
• Volvo Penta THAMD70C, THAMD70B
• Volvo Penta TMD70C, TMD70B
• Volvo Penta MD120A
• Volvo Penta TAMD120A
• Volvo Penta TAMD121D
• Volvo Penta TAMD61A
• Volvo Penta TAMD62A
• Volvo Penta TMD100A
• Volvo Penta TMD120A
• Volvo Penta TMD121C