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Lists necessary tools and the initial step of securing the hub axle in a vice for disassembly.
Instructions for removing the left hand cone and dust cap from the hub axle.
Details the removal of ball retainer I and the hub shell from the hub assembly.
Covers the removal of stop springs, carrier units, and gear units from the hub.
Focuses on the removal of ball retainer M from the driver unit.
Securing the hub axle in a vice and placing ball retainer M onto the driver unit.
Connecting planet pinion teeth in carrier unit 1 with driver unit teeth, requiring careful turning.
Engaging sun gear units and placing ring gear unit 2 onto carrier unit 1.
Engaging carrier components and ring gear unit 2, and inserting the stop spring.
Installing internal assembly, ball retainer I, and adjusting the left hand cone.
Attaching the right hand dust cap to the hub shell and checking for smooth rotation.
Lists necessary tools and the initial step of securing the hub axle in a vice for disassembly.
Instructions for removing the left hand cone and dust cap from the hub axle.
Details the removal of ball retainer I and the hub shell from the hub assembly.
Covers the removal of stop springs, carrier units, and gear units from the hub.
Focuses on the removal of ball retainer M from the driver unit.
Securing the hub axle in a vice and placing ball retainer M onto the driver unit.
Connecting planet pinion teeth in carrier unit 1 with driver unit teeth, requiring careful turning.
Engaging sun gear units and placing ring gear unit 2 onto carrier unit 1.
Engaging carrier components and ring gear unit 2, and inserting the stop spring.
Installing internal assembly, ball retainer I, and adjusting the left hand cone.
Attaching the right hand dust cap to the hub shell and checking for smooth rotation.
The Shimano Nexus SG-7R46 is a 7-speed internal gear hub designed for bicycles, offering a reliable and low-maintenance shifting solution. This service manual, volume 1, provides detailed instructions for the disassembly and assembly of the hub, along with a comprehensive spare parts list.
The SG-7R46 hub integrates a 7-speed planetary gear system within its shell, providing a wide range of gears suitable for various riding conditions without the need for an external derailleur. This internal mechanism protects the gears from dirt, impacts, and weather, contributing to its durability and consistent performance. The hub is designed to work with a Hi-Power Roller Brake (BR-IM41-R Inter-M Brake), ensuring effective stopping power. The internal assembly consists of several key components, including carrier units, sun gears, ring gears, and ball retainers, all working in concert to provide smooth gear changes. The driver unit connects to the bicycle's chain, transmitting power to the internal gears, which then drive the hub shell and the wheel. The design emphasizes a sealed system to minimize the ingress of contaminants, thus extending the life of the internal components.
The internal gear hub offers several advantages for the rider. Its enclosed design means less exposure to the elements, resulting in reduced wear and tear compared to external derailleur systems. This translates to fewer adjustments and a more consistent shifting experience over time. The 7-speed range provides sufficient gearing for commuting, touring, and general recreational cycling, allowing riders to tackle both inclines and flats with ease. Shifting can be performed while stationary, which is particularly useful in urban environments with frequent stops and starts. The hub's robust construction makes it a suitable choice for daily use, offering a dependable and hassle-free cycling experience. The compatibility with a roller brake system further enhances its utility, providing reliable braking performance in various weather conditions.
The SG-7R46 hub is designed for relatively straightforward maintenance, primarily involving disassembly, cleaning, lubrication, and reassembly. The service manual outlines a step-by-step process for these tasks.
This detailed process ensures that the hub is correctly assembled and lubricated, maintaining its optimal performance and extending its lifespan. The use of specific Shimano grease (Y-041 20800) is highlighted throughout the assembly steps, emphasizing the importance of proper lubrication for the internal mechanisms. The manual also includes a comprehensive spare parts list with Shimano code numbers and descriptions for easy identification and ordering of replacement components.
General| Model Number | SG-7R46 |
|---|---|
| Series | Nexus |
| Category | Industrial Equipment |
| Speed | 7-speed |
| Gear Ratio Total | 244% |
| Gear Change Support Mechanism | Yes |
| Brake Type | Roller Brake |
| Material | Aluminum |
| Type | Internal Gear Hub |
| Spoke Hole | 36H |
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