4L310 V-Belt – 1/2" x 31" FHP Drive Belt

The 4L310 is a standard fractional-horsepower V-belt designed for compatible commercial garage door operators, mechanical drive systems, and other equipment requiring a 4L-section belt with a 31-inch nominal outside length.

V-belts transfer power between motor and driven pulleys through friction along the angled sides of the belt. Proper belt size and tension are critical for smooth operation, reliable power transmission, and reduced wear on operator components.

Specifications

• Belt Number: 4L310

• Belt Section: 4L

• Top Width: 1/2"

• Nominal Outside Length: 31"

• Nominal Thickness: 5/16"

• Number of Strands: 1

• Belt Type: V-Belt / Fractional Horsepower

• Application: Compatible Operator & Mechanical Drive Systems

Common Applications

Suitable for equipment specifically designed to use a 4L310 belt, including compatible:

• Commercial garage door operators

• Industrial overhead door operators

• Motor and pulley drive assemblies

• Fractional-horsepower drive systems

• Light-duty mechanical equipment

Belt Size Identification

The 4L310 designation identifies the belt size:

• 4L = approximately 1/2" top width

• 310 = approximately 31" nominal outside length

When replacing an existing belt, matching the complete belt number is the simplest way to identify the correct replacement.

Compatibility & Matching

Before ordering, verify:

• Existing belt number

• Belt width

• Belt length

• Pulley groove size

• Operator or equipment model

For a direct replacement, the existing belt should normally be marked 4L310.

Do not select a replacement based only on approximate belt length. Belts with similar dimensions but a different cross-section may not properly fit the pulley groove.

Installation Notes

A replacement V-belt should be installed with proper pulley alignment and belt tension.

A belt that is too loose may slip, generate heat, reduce power transfer, or wear prematurely. Excessive belt tension can place unnecessary load on motor shafts, bearings, and operator components.

Inspect the pulleys for excessive wear or damage when replacing the belt.

Package Contents

• 1 – 4L310 V-Belt, 1/2" x 31"

Pulleys, motors, sprockets, shafts, operators, and other drive components are sold separately.

Important Note

Disconnect electrical power and secure the door or driven equipment before servicing an operator or belt-drive assembly.

Always match the replacement belt to the original belt size and equipment requirements.