This document serves as a Dealer's Manual for Shimano front hubs and freehubs designed for disc brake systems, specifically covering models HB-M3050, FH-M3050, HB-MT200, FH-MT200-B, HB-RM33, FH-RM33, FH-RM35, HB-TX505, FH-TX505, FH-TY505, and FH-UR600. It provides essential information for professional bicycle mechanics regarding the installation, adjustment, and maintenance of these components.
Function Description
The manual details the installation and maintenance procedures for front hubs and freehubs, which are critical components of a bicycle's wheel system. The front hub allows the front wheel to rotate smoothly around its axle, while the freehub, typically found on the rear wheel (though this manual focuses on front hubs and freehubs for disc brakes), allows the cassette to rotate independently of the wheel when coasting. Both components are designed for disc brake compatibility, indicating they are built to accommodate disc brake rotors for effective braking performance.
Usage Features
The manual emphasizes safety and correct usage throughout its instructions. Key usage features and considerations include:
- Secure Wheel Installation: Users are strongly advised to ensure that wheels are securely fastened to the bicycle before riding. Loose wheels can detach, leading to serious injury.
- Disc Brake Rotor Interference: For quick release type hubs, it is crucial to confirm that the quick release lever does not interfere with the disc brake rotor. Interference can cause the bicycle to fall forward, resulting in injury. If interference occurs, usage should be stopped, and a dealer contacted.
- Disc Brake Rotor Cooling: Before operating the quick release lever, users must ensure the disc brake rotor has cooled down to prevent burns or injury.
- Proper Quick Release Hub Installation: The quick release hub must be properly installed on the bicycle to prevent the wheel from detaching during a ride.
- Front Suspension Fork Compatibility: When installing the front wheel to a front suspension fork, users must strictly follow the instructions provided in the front suspension fork manual, as securing methods and tightening torques vary. Failure to do so can lead to the front wheel falling out.
- Wheel Retention Mechanism: For quick release type hubs, the front fork must be equipped with a wheel retention mechanism for added safety.
- Spoke Lacing: The manual illustrates correct spoke lacing patterns, specifically noting that radial lacing cannot be used for these hubs. This ensures proper wheel strength and integrity.
- Disc Brake Rotor Installation: Instructions are provided for installing the disc brake rotor using a lock ring and a specific tool (TL-LR15), with a specified tightening torque of 40 N·m.
Maintenance Features
The manual outlines detailed maintenance procedures for both front hubs and freehubs, emphasizing the importance of periodic inspection and lubrication to ensure optimal performance and longevity.
- Front Hub Disassembly and Lubrication: The front hub can be disassembled, and grease should be applied to its various parts at periodic intervals. The manual provides an exploded view of the front hub components to guide this process. Tools such as a 10 mm hexagon wrench (TL-HS33), a 12 mm hexagon wrench (TL-HS35), and an adjustable wrench (TL-HS37) are listed for this purpose.
- Freehub Disassembly and Lubrication: Similar to the front hub, the freehub can also be disassembled, and its components require periodic greasing. Exploded views are provided for different freehub models (FH-M3050 / RM33 / RM35 / UR600 and FH-MT200-B / TX505 / TY505).
- Freewheel Body Replacement: The manual details the procedure for replacing the freewheel body.
- For FH-M3050 / RM33 / RM35 / UR600 models, after removing the hub axle, the freewheel body fixing screw (located inside the freewheel body) is removed using a 10 mm hexagon wrench (TL-HS33), and then the freewheel body can be replaced. The tightening torque for assembly is 35-50 N·m.
- For FH-MT200-B / TX505 / TY505 models, after removing the hub axle, the freewheel body is replaced. A 12 mm hexagon wrench (TL-HS35) is used for this process, with a significantly higher tightening torque of 147-200 N·m.
- Non-Disassembly of Freewheel Body: A critical notice for FH-MT200-B / TX505 / TY505 models advises against attempting to disassemble the freewheel body itself, as this may lead to malfunction.
- General Maintenance Advice:
- If the wheel becomes stiff or difficult to turn, an inspection is required.
- Internal parts of the hub should not be lubricated, as this can cause grease to flow out.
- The use of SHIMANO lubricants and maintenance products is highly recommended for maximum performance.
- Products are not guaranteed against natural wear and deterioration from normal use and aging.
- The product is not warranted against damage from improper use, such as jumping or falls, unless malfunctions are due to manufacturing methods.
The manual also lists specific tools required for these maintenance tasks, including various hexagon wrenches and an adjustable wrench, identified by their Shimano tool codes (TL-LR15, TL-HS33, TL-HS35, TL-HS37).
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