TB Wood's MS-77 Variable Sheave

Description:

The TB Wood's MS-77 Variable Sheave is used in industrial variable speed belt drive systems to provide adjustable speed control by changing the effective pitch diameter of the sheave. Commonly installed in conveyors, pumps, fans, blowers, mixers, machine tools, and other industrial equipment requiring mechanical speed adjustment. Maintenance teams, OEMs, and system integrators use this variable sheave for equipment replacement, drive system upgrades, preventive maintenance, and new variable speed drive installations.

Applications:

The TB Wood's MS-77 Variable Sheave is commonly used in industrial automation environments including conveyor systems, HVAC equipment, material handling machinery, pump and fan drives, textile equipment, and manufacturing production lines where adjustable output speed, efficient power transmission, and reliable mechanical speed control are essential. Its variable-pitch design allows belt position adjustment to optimize machine performance without changing motor speed.

Technical Specifications:

• Manufacturer: TB Wood's (Regal Rexnord)
• Model / Part Number: MS-77
• Product Type: Variable Sheave
• Sheave Type: Variable Pitch Mechanical Speed Sheave
• Belt Compatibility: Classical V-Belts (application dependent)
• Maximum Pitch Diameter: 7.75 in.
• Sheave Construction: Adjustable Split Sheave
• Material: High-Tensile Cast Iron
• Speed Adjustment: Mechanical Variable Pitch Design
• Mounting: Shaft Mounted
• Balance: Dynamically Balanced Assembly
• Lubrication: Grease Lubricated Moving Components
• Service Kits Available: MS77K1 Seal Kit, MS77K2 Resilient Key Kit
• Features: Adjustable speed ratio, durable cast iron construction, precision-machined faces, field-adjustable belt pitch diameter
• Application Environment: Industrial variable speed power transmission systems

Common Replacements:

• TB Wood's MS-77
• Eaton 20S
• Reeves 98