# 22275076 Pump Piston | Genuine Volvo Penta Part

## 🔧 Product Description

The strength required to steer a boat with a hydraulic steering system is inversely proportional to the number of turns of the wheel lock-to-lock. Wheel turns are determined by the ratio between the cylinder volume, the pump displacement and the free movement of the steering device. A large cylinder volume with a small pump displacement gives more wheel turns; a small cylinder volume with a large pump displacement gives fewer. Fewer wheel turns means quicker steering response but more effort; more wheel turns means slower response but less effort. The helm pumps are available in three displacement sizes - 28 cc, 33 cc and 39 cc - each in three mountings: front mount, rear mount and tilt mount. This is the 28 cc tilt mount pump, with 5 pistons, a 70 bar relief valve setting and a maximum wheel diameter of 508 mm.

## ⚙️ Key Features

-   28 cc displacement per wheel revolution
-   Tilt mount
-   Five piston pump
-   70 bar relief valve setting
-   For steering wheels up to 508 mm in diameter
-   Requires tilt mechanism 22299003, ordered separately
-   5.392 kg
-   Replaces 21639576
-   Tilt mount helm pump
-   5 pistons
-   Maximum wheel diameter 508 mm
-   5 kg
-   Displacement per rev: 28 cc
-   Max wheel diameter: 508 mm
-   Pistons: 5
-   Mounting: Tilt mount helm pump
-   Relief valve setting: 70 bar
-   Weight: 5 kg
-   Fits: Volvo Penta hydraulic steering systems

## 🔌 Function

Converts steering wheel rotation into pressurised hydraulic oil flow to the steering cylinder, on a helm whose angle can be adjusted.

## ⚠️ Common Signs of Failure

-   Heavy, notchy or inconsistent steering
-   Wheel turning without the drive following, from internal bypass
-   Hydraulic oil weeping at the shaft seal or the port fittings
-   Helm will not hold its set tilt angle
-   Air drawn into the circuit giving a spongy helm

## 🛠️ Service Notes

-   Budget for tilt mechanism 22299003 as well - a tilt mount pump cannot be installed without it
-   Check the wheel diameter: tilt mount pumps are rated to 508 mm, so a wheel sized for a fixed helm may be too large
-   The same 28 cc pump is 22275070 in front mount and 22275073 in rear mount
-   Tilt mechanism 22299003 is required and must be ordered separately
-   Displacement and mounting together are the product: the same 28 cc displacement is also listed as 22275070 and 22275073, and the other tilt mount pumps are 22275077 and 22275078
-   Cylinder volume and pump displacement together set how many turns the wheel takes lock to lock

## 🔄 Supersession & Cross Reference

### OEM Supersession Chain

-   22275076 → Supersedes 21639576 → Supersedes 21135049 → Supersedes 3809978

### OEM / Related Numbers

-   21639576 earlier number superseded by this part
-   21135049 earlier number superseded by this part
-   3809978 earlier number superseded by this part
-   22299003 (required tilt mechanism)

## 📦 Condition

-   Genuine Volvo Penta part
-   Brand new
-   Supplied in original or equivalent packaging

## Details

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

## Variants

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

## Images

- 22275076 Pump Piston | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/22275076-pump-piston-genuine-volvo-penta)
> Updated: 2026-10-11