22275073 Pump Piston | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta 28 cc Rear Mount Hydraulic Steering Helm Pump - Part Number: 22275073

Complete hydraulic steering helm pump with 28 cc displacement per steering-wheel revolution, a 5-piston pumping mechanism and a 70 bar relief setting. This is the rear mount version and replaces earlier helm-pump reference 21639573.

⚙️ Key Features

• 28 cc displacement per wheel revolution

• Rear Mount configuration

• 5-piston hydraulic pump

• 70 bar relief-valve setting

• Maximum recommended steering-wheel diameter 711 mm

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 22275073 → Supersedes 21639573

OEM / Related Numbers:

• 22275073

• 21639573

Aftermarket / Verified Equivalents:

• No aftermarket equivalent

🚤 Compatibility

Commonly used on:

• Volvo Penta accessory hydraulic steering systems for rudder installations

Typically suits:

• Engine models:

• Fitment is controlled by the exact Volvo Penta assembly and product serial number; no broader engine-model list is published for this service item.

• Engine Type: Marine hydraulic steering system

• Displacement: 28 cc per revolution

• Mounting: Rear Mount

• Pump Pistons: 5

• Relief Pressure: 70 bar

• Maximum Steering-Wheel Diameter: 711 mm

• Approximate Weight: 5 kg

🔌 Function

Converts steering-wheel rotation into pressurised hydraulic-oil flow for the vessel steering cylinder.

Common signs of failure:

• Heavy, notchy or inconsistent steering

• Internal bypass causing excessive wheel turns

• Hydraulic fluid leakage

• Air repeatedly entering the steering circuit

• Steering will not hold the commanded position

📦 Condition

• Genuine Volvo Penta part

• Brand new

• Supplied in original or equivalent packaging