21846852 Servo Unit | Genuine Volvo Penta Part

🔧 Product Description

Hydraulic steering servo unit used on D8A5-A MH marine-commercial installations. It converts helm or control-system input into assisted steering movement at the propulsion steering mechanism.

🚤 Compatibility

• Engine Family: D, IPS
• HP Range: 110-435 HP

Full model list at the end of this description.

⚙️ Key Features

• Hydraulic assisted-steering unit
• D8A5-A MH steering application
• Factory mounting and port arrangement
• Designed for marine-commercial duty
• Engine type: Marine-commercial diesel propulsion

🔌 Function

Provides hydraulic steering assistance and controlled movement of the connected steering mechanism.

⚠️ Common Signs of Failure

• Heavy or intermittent steering effort
• Delayed or uneven steering response
• Hydraulic leakage at the body or ports
• Noise, heat or binding during operation

🛠️ Service Notes

• At around 12.5 kg this is a heavy assembly for a servo unit — arrange proper support before the last fixing comes out, particularly in a confined engine space
• Check the fluid supply, wiring and connectors before condemning the unit, as low fluid or a poor electrical connection on the EVC steering system gives the same symptoms as a failed servo

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 21846852 → Supersedes 22796035

OEM / Related Numbers

• 22796035 earlier number superseded by this part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 D6-330D-E, D6-370D-E, D6-330A-F, D6-370A-F, D6-330D-F, D6-370D-F, D6-300A-F, D6-300D-F, D6-300I-F, D6-310D-E, D6-330I-F, D6-370I-F, D6-435D-E, D6-435D-F, D6-400A-F, D6-435I-F
• Volvo Penta D13C1-A MP, D13C2-A MP, D13C3-A MP, D13C4-A MP, D13B-E MH, D13B-E MH (FE), D13B-N MH, D13B-N MH (FE), D13C6-A MP, D13C1-A MH, D13C2-A MH, D13C5-A MP
• Volvo Penta D4-260A-F, D4-260D-E, D4-260D-F, D4-260I-F, D4-300A-F, D4-300D-E, D4-300D-F, D4-180I-F, D4-225I-F, D4-300I-F, D4-225A-F
• Volvo Penta D3-110I-H, D3-140A-H, D3-170A-H, D3-200A-H, D3-220A-H, D3-150I-H, D3-170I-H, D3-200I-H, D3-220I-H, D3-140I-H
• Volvo Penta D8A5-A MH, D8A6-A MH, D8A1-A MP, D8A2-A MP, D8A3-A MP, D8A4-A MP
• Volvo Penta D11B3-A MP, D11B4-A MP, D11B2-A MP, D11B1-A MP
• Volvo Penta IPS-F
• Volvo Penta 8.1IPSCE-Q