Continental Contitech 20039591 BX78 Cogged V-belt Bx Section

Product Description

The CONTINENTAL CONTITECH 20039591 is a BX-section cogged V-belt designed for industrial and HVAC drive applications requiring reliable, high-flex power transmission. Built with Fiber-Reinforced Vytracord construction and a cogged profile, this belt reduces bending resistance for greater efficiency on smaller-diameter sheaves. The BX78 designation reflects an 81.0-inch outside length and 79.80-inch internal length. Its oil-resistant compound resists degradation in environments where lubricant splash or mist is present. HVAC technicians, mechanical contractors, and industrial maintenance professionals install this belt on blower, fan, and compressor drive assemblies.

This belt is suited for residential and commercial HVAC air-handling units, industrial fans, compressors, and general-purpose belt-drive equipment that spec a BX-section cogged belt. The Torque-Flex style designation indicates the belt is engineered for high-torque, variable-speed, and reversing-drive applications where a standard wrapped belt would generate excess heat or slip. The oil-resistant formulation makes it appropriate for machine rooms and mechanical spaces where fluid contamination is likely. Install it as a direct replacement for any application calling for a BX78 belt.

Key Features

• Cogged profile reduces flex stress and improves efficiency on small-sheave drives
• Fiber-Reinforced Vytracord tensile cords provide high tensile strength and dimensional stability
• Oil-resistant compound extends service life in environments with lubricant exposure
• Torque-Flex design handles high-torque, variable-speed, and reversing-drive loads
• Wide operating temperature range: -40 degrees F to 140 degrees F (-40 degrees C to 60 degrees C)
• BX78 industry-standard belt number ensures cross-reference compatibility

Compatibility

Designed as a direct OEM-style replacement for drive systems specifying a BX78 cogged V-belt with an 81.0-inch outside length and BX cross-section profile.

Installation Notes

Belt replacement is typically performed by licensed HVAC technicians or mechanical maintenance personnel. Disconnect and lock out all power to the drive unit before removing the old belt or adjusting sheaves. Proper belt tension is critical — both over-tensioning and under-tensioning shorten belt and bearing life; follow the equipment manufacturer's deflection specification. Never pry a V-belt over sheave flanges using sharp tools, as this can damage the tensile cords.