# Advance D300A Marine Reduction Gearbox — Ratio 5.05:1

> Advance D300A Marine Reduction Gearbox — Ratio 5.05:1. The Advance D300A is a heavy-duty marine reduction gearbox for ship and boat propulsion.Its rugged…

- URL: https://www.marine-equipment-supply.com/products/marine-gearboxes/advance-d300a-marine-reduction-gearbox-ratio-5-05-1/
- Category: [Marine Gearboxes](https://www.marine-equipment-supply.com/products/marine-gearboxes/)
- Brand: Advance
- Supplier: Shanghai Mars Industrial Co., Ltd. (MARS), Shanghai, China
- Price: on request — [request a quote](https://www.marine-equipment-supply.com/contact/) · WhatsApp +86 176 2154 1688 · inquiry@marine-equipment-supply.com

## Overview

The Advance D300A is a heavy-duty marine reduction gearbox for ship and boat propulsion. Its rugged cast-iron housing, precision helical gears, and multi-plate clutch transmit high thrust smoothly from the main diesel engine to the propeller shaft. Configured with a 5.05:1 reduction ratio, an SAE 0/1 bell housing, and rated for 60 KN propeller thrust, it is supplied ready for global export.

## Key selling points

- 5.05:1 reduction ratio with 60 KN rated propeller thrust for demanding propulsion
- Heavy-duty cast-iron housing for long service life in harsh marine environments
- Precision helical gears and multi-plate clutch for smooth, reliable transmission
- SAE 0/1 bell housing for standard engine matching
- 1 Year / 1500 hrs warranty with wooden-box export packing

## Technical specifications

| Parameter | Value |
| --- | --- |
| Brand | Advance |
| Model | D300A |
| Type | Heavy Duty |
| Reduction Ratio | 5.05:1 |
| Bell Housing | SAE 0 / 1 |
| Input Speed | 750–2500 rpm |
| Rated Propeller Thrust | 60 KN |
| Centre Distance | 355 mm |
| Dimensions (L×W×H) | 786 × 1010 × 1041 mm |
| Weight | 680 kg |
| Certificate | CCS |
| Application | Marine / Ship |
| Warranty | 1 Year / 1500 hrs |

## Features & highlights

- Rigid cast-iron construction resists vibration and supports high loads
- Helical gearset with heavy-duty thrust bearing for smooth engagement and axial-load handling
- Machined output flange for secure, precise shaft connection
- Control valve and dipstick for easy operation and maintenance
- Lifting eyes for safe handling and installation

## Typical applications

Marine main propulsion for fishing boats, cargo ships, tug boats, and yachts, matched to the vessel's engine power and required reduction ratio.

## Customization options

Alternative reduction ratios, input-speed matching, bell-housing and coupling configurations, and OEM requirements available on request. Contact us with your engine model and vessel specifications for a tailored recommendation.

## Ordering information

Supplied in protective wooden-box packing for safe global transport. Warranty: 1 Year / 1500 hrs. Please confirm engine model, power, and required reduction ratio when ordering.

## FAQ

### What is the Advance D300A Marine Reduction Gearbox used for?

Marine main propulsion for fishing boats, cargo ships, tug boats, and yachts, matched to the vessel's engine power and required reduction ratio.

### What warranty comes with the Advance D300A Marine Reduction Gearbox?

The Advance D300A Marine Reduction Gearbox is supplied with a 1 Year / 1500 hrs warranty. The exact warranty terms are confirmed on your quotation.

### Can the Advance D300A Marine Reduction Gearbox be customized?

Alternative reduction ratios, input-speed matching, bell-housing and coupling configurations, and OEM requirements available on request.Contact us with your engine model and vessel specifications for a tailored recommendation.

### How is it inspected, packed and shipped?

Each unit is checked against your order before dispatch, with a written outgoing-inspection report and video (machinery is run-tested). Goods are packed in export wooden-box or crate packing and shipped FOB or CIF from Shanghai; stock items ship promptly and built-to-order items typically within about 20 working days.

### How do I get a price for the Advance D300A Marine Reduction Gearbox?

Send an inquiry with the required configuration, quantity and destination port using the form on this page, email inquiry@marine-equipment-supply.com or WhatsApp +86 176 2154 1688. We reply with a matched recommendation and quotation within 24 hours on working days.