# 21186657 Tandem Pump | Genuine Volvo Penta Part

## 🔧 Product Description

Genuine Bosch hydraulic tandem or steering pump used on selected Volvo Penta D9, D11 and TAD11 diesel engines. It is an anti-clockwise vane-pump assembly with documented M16x1.5 and M26x1.5 connections.

## 🚤 Compatibility

-   **Engine Family:** D, TAD
-   **Serial Range:** With servo pump., 25L/min, SN1090227177-

Full model list at the end of this description.

## ⚙️ Key Features

-   Anti-clockwise rotation
-   M16x1.5 and M26x1.5 hydraulic connections
-   Three-bore mounting arrangement
-   Confirmed D9, D11 and TAD11 applications

## 🔌 Function

The pump supplies pressurised hydraulic fluid to the steering or servo system from the engine-driven accessory gear.

## ⚠️ Common Signs of Failure

-   Heavy or intermittent steering
-   Low hydraulic pressure
-   Pump whine
-   Foaming or aerated hydraulic fluid
-   Shaft play or drive noise

## 🛠️ Service Notes

-   Work clean and cap the connections as they come off — a tandem pump serves two circuits from one drive, and dirt entering either one damages the pump and everything downstream of it
-   Renew the sealing rings, gaskets and mounting seals specified for the job, and check the drive and the mounting face for wear before fitting
-   Check the drive engages correctly and is neither preloaded nor misaligned as the fixings are tightened to the figures in the manual for your engine
-   Prime and bleed both circuits by the procedure for your engine before cranking, and do not run the pump dry
-   Work out why the old pump failed — contamination, a starved supply or a restricted return will take out the replacement as well — and renew the relevant filters at the same time

## 🔄 Supersession & Cross Reference

### OEM Supersession Chain

-   21186657 → Supersedes 20902692 → Supersedes 20453452

### OEM / Related Numbers

-   20902692 earlier number superseded by this part
-   20453452 earlier number superseded by this part
-   21488865 related reference
-   8002141 related reference

### Other-Brand OEM Numbers

-   Bosch: K S00 000 450
-   Hella: 8TL 359 000-891

### Aftermarket / Verified Equivalents

-   Febi Bilstein: 106028
-   Trucktec Automotive: 03.37.064
-   Sampa: 034.415
-   ST-Templin: 05.050.4014.080
-   4U Autoparts: 12312VO
-   PE Automotive: 142.510-00A
-   EBS: 20.01.1167
-   KTK Germany: 22725
-   DSS: 250085
-   DT Spare Parts: 2.53455
-   Vaden Original: 330.03.0025
-   OSSCA: 56181
-   Auger: 83481
-   Stellox: 84-32767-SX
-   Casals: 97513
-   Motorherz: P1601HG
-   Germo: VM10236

## 📦 Condition

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

## 🔎 Full Model Compatibility

Typically suits:

-   Volvo Penta D11C1-A MP, D11C3-A MP, D11C2-A MP, D11C4-A MP, D11B3-A MP, D11B4-A MP, D11A-A, D11A-B, D11A-C, D11A-D, D11A-E, D11B2-A MP, D11A-C MP, D11A-D MP, D11A-E MP, D11A-C (IPS), D11B1-A MP
-   Volvo Penta D9A2J, D9A2G, D9A2L MH, D9A2D, D9A2B, D9A2F, D9A2K, D9A2H, D9A2M MP, D9A2A, D9A2C, D9A2E
-   Volvo Penta D8A5-A MH, D8A6-A MH, D8A3-A MP, D8A4-A MP
-   Volvo Penta TAD1140-42VE
-   Volvo Penta TAD1150-52VE
-   Volvo Penta TAD1170-72VE
-   Volvo Penta TAD1180-83VE
-   Volvo Penta TAD950VE
-   Volvo Penta TAD951VE
-   Volvo Penta TAD952VE

## Details

- **Price:** 3731.55 AUD
- **Vendor:** Volvo Penta
- **Type:** Pumps
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 3731.55 AUD | In stock |

## Images

- 21186657 Tandem Pump | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/21186657-tandem-pump-genuine-volvo-penta)
> Updated: 2026-09-06