# 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

## Details

- **Price:** 1429.18 AUD
- **Vendor:** Volvo Penta
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 1429.18 AUD | In stock |

## Images

- 22275073 Pump Piston | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/22275073-pump-piston-genuine-volvo-penta)
> Updated: 2026-08-04