# 21840806 Trimming Cylinder | Genuine Volvo Penta Part

## 🔧 Product Description

Complete starboard hydraulic trim cylinder for Volvo Penta DPH and DPR sterndrive transom-shield systems. It replaces cylinder 3888301 and is the right-hand cylinder when viewed from behind the vessel.

## 🚤 Compatibility

Typically suits:

-   Volvo Penta DPH-D1
-   Volvo Penta D6-330A-F
-   Volvo Penta D6-370A-F
-   Volvo Penta D4-260A-F
-   Volvo Penta D4-300A-F
-   Volvo Penta D6-300A-F
-   Volvo Penta D4-225A-F
-   Volvo Penta D6-300A-G
-   Volvo Penta D6-340A-G
-   Volvo Penta D6-380A-G
-   Volvo Penta DPH-E
-   Volvo Penta TSK DPH-E
-   Volvo Penta D6-400A-G
-   Volvo Penta D6-400A-F
-   Volvo Penta DPR-D
-   Volvo Penta D4-150A-G
-   Volvo Penta D4-230A-G
-   Volvo Penta D4-270A-G
-   Volvo Penta D4-300A-G
-   Volvo Penta TSK DPH-E1

-   **Engine Family:** DPH, D, TSK, DPR
-   **HP Range:** 150-400 HP

## ⚙️ Key Features

-   Starboard/right-hand trim-cylinder position
-   Complete hydraulic cylinder assembly
-   Direct replacement for 3888301
-   DPH and DPR sterndrive application
-   Supports precise trim and tilt control
-   Engine type: Marine diesel sterndrive

## 🔌 Function

Converts hydraulic pressure into controlled movement of the sterndrive, setting running trim and raising the drive for service or shallow-water operation.

## ⚠️ Common Signs of Failure

-   Drive trims slowly or unevenly
-   Drive drifts down and will not hold position
-   Hydraulic fluid leakage at the rod or end cap
-   Pitted, bent or corroded piston rod
-   Cylinder binds, knocks or fails to complete its travel

## 🛠️ Service Notes

-   This is the starboard-side cylinder for DPH/DPR — the port-side equivalent is a separate, differently numbered cylinder, so confirm which side is being replaced before ordering
-   A rebuild kit (dust seal, pressure seal, wiper, O-rings and end cap) is available if the cylinder is otherwise sound but weeping — bleed the trim system and check the fluid level after either a rebuild or a full replacement

## 🔄 Supersession & Cross Reference

### OEM Supersession Chain

-   21840806 → Supersedes 3888301 → Supersedes 3862853

### OEM / Related Numbers

-   3888301 earlier number superseded by this part
-   3862854 earlier number superseded by this part
-   3862853 earlier number superseded by this part
-   21840807 (port-side counterpart)
-   22121309 (later port-side cylinder reference)
-   SK-301 trim-cylinder seal kit

### Aftermarket / Verified Equivalents

-   SLP TP-806 complete starboard trim cylinder
-   RECMAR REC21840806 complete replacement
-   RECMAR REC19088 service end cap
-   RECMAR REC22169 seal kit

## 📦 Condition

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

## Details

- **Price:** 1221.77 AUD
- **Vendor:** Volvo Penta
- **Type:** Drives & Propulsion
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 1221.77 AUD | In stock |

## Images

- 21840806 Trimming Cylinder | Genuine Volvo Penta Part
- 21840806 Trimming Cylinder | Genuine Volvo Penta Part - photo 2 of 2

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/21840806-trimming-cylinder-genuine-volvo-penta)
> Updated: 2026-09-19