Mercury 859101T03 Forward Gear Assembly for 35–60HP 4-Stroke Outboard Engines
Mercury · Mechanical & Power Transmission
Description The Mercury 859101T03 Forward Gear is a precision gear assembly designed for Mercury 35–60HP four-stroke outboard engines. It operates within the lower unit gearcase to transmit rotational power from the driveshaft to the propeller shaft during forward operation. Built to OEM specifications, this gear ensures smooth propulsion and reliable drivetrain performance. Technical Specifications Condition New/Never Used Surplus Brand Mercury Category Marine Engine Components Part Number 859101T03 Subcategory Forward Gears Manufacturer Mercury Marine Product Type Forward Gear Assembly Engine Compatibility Mercury 35–60 HP EFI Four-Stroke Outboards Gear Ratio Compatibility 1.83:1 Gearcase Gear Teeth 22 Teeth Application Outboard Lower Unit Gearcase Function Forward Drive Power Transmission Weight 1.40 lb Information About 859101T03 The 859101T03 is a forward gear assembly used in Mercury and Mariner outboard gearcases equipped with a 1.83:1 gear ratio. It is engineered to mesh with the pinion and reverse gears inside the lower unit to deliver efficient power transfer when the engine is shifted into forward gear. This component is commonly installed in Mercury 35, 40, 50, and 60 HP EFI four-stroke outboard engines with compatible gear housing assemblies. Designed with precision-machined teeth and durable marine-grade materials, the gear supports consistent propulsion and long-term drivetrain reliability. Key Features: Forward Gear Assembly: Transfers rotational power to the propeller shaft when the outboard operates in forward drive. Mercury OEM Component: Manufactured to factory specifications for proper fit and drivetrain compatibility. 1.83:1 Gearcase Compatibility: Designed for gear housings with a 1.83:1 gear ratio. Multi-Engine Fitment: Compatible with Mercury 35–60 HP EFI four-stroke outboard engines. Precision-Cut Gear Teeth: Ensures smooth engagement with pinion and reverse gears inside the gearcase. Marine-Grade Construction: Built to withstand high loads, vibration, and continuous marine operation. Lower Unit Integration: Designed to operate within the outboard gear housing assembly. The 859101T03 delivers the reliability and precision required for efficient power transfer within marine outboard lower unit drivetrain systems.
Brand: Mercury · Category: Mechanical & Power Transmission
Key features
- Forward Gear Assembly: Transfers rotational power to the propeller shaft when the outboard operates in forward drive.
- Mercury OEM Component: Manufactured to factory specifications for proper fit and drivetrain compatibility.
- 1.83:1 Gearcase Compatibility: Designed for gear housings with a 1.83:1 gear ratio.
- Multi-Engine Fitment: Compatible with Mercury 35–60 HP EFI four-stroke outboard engines.
- Precision-Cut Gear Teeth: Ensures smooth engagement with pinion and reverse gears inside the gearcase.
- Marine-Grade Construction: Built to withstand high loads, vibration, and continuous marine operation.
- Lower Unit Integration: Designed to operate within the outboard gear housing assembly.
Specifications
| Manufacturer part number | 859101T03 |
|---|---|
| Condition | New/Never Used Surplus |
| Brand | Mercury |
| Category | Marine Engine Components |
| Part Number | 859101T03 |
| Subcategory | Forward Gears |
| Manufacturer | Mercury Marine |
| Product Type | Forward Gear Assembly |
| Engine Compatibility | Mercury 35–60 HP EFI Four-Stroke Outboards |
| Gear Ratio Compatibility | 1.83:1 Gearcase |
| Gear Teeth | 22 Teeth |
| Application | Outboard Lower Unit Gearcase |
| Function | Forward Drive Power Transmission |
| Weight | 1.40 lb |
| Product type | Forward Gears |
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