JRG V2 Garage Door Chain Hoist – 1-1/4-Inch Bore, 4.5:1 Gear Reduction

Product Description

The JRG V2 garage door chain hoist is a gear-reduced manual operator designed for sectional overhead doors equipped with a 1-1/4-inch keyed shaft.

Its 4.5:1 gear-reduction system reduces the effort required to manually open and close large or heavy garage doors. The shaft-mounted design installs directly onto the torsion shaft, making it suitable for commercial, industrial and agricultural sectional-door applications where electrical operation is unnecessary or unavailable.

Features

• Designed for sectional overhead garage doors
• Fits a 1-1/4-inch keyed torsion shaft
• 4.5:1 gear-reduction ratio
• Gear-driven manual operation
• Shaft-mounted jackshaft design
• Plastic hand-chain guide helps maintain proper chain travel
• Fits installations with a minimum 3-3/8-inch shaft offset
• Provides controlled manual operation for large or heavy doors
• Suitable for commercial and industrial applications
• No electrical power required

How It Works

The operator mounts directly onto the garage door’s torsion shaft. Pulling the galvanized hand chain turns the internal gear mechanism, which rotates the shaft and moves the door through the track system.

The 4.5:1 reduction ratio provides additional mechanical advantage, allowing the user to operate the door with less pulling force than a direct-drive chain hoist.

Package Contents

• JRG V2 gear-reduced chain hoist
• 26 ft of galvanized hand chain
• One hand-chain keeper
• Two shaft collars

Doors higher than approximately 15 feet may require additional hand chain.

Compatibility & Fitment

Designed for compatible sectional overhead garage doors with:

• A 1-1/4-inch keyed torsion shaft
• A minimum 3-3/8-inch shaft-to-wall or shaft-to-door offset
• A properly balanced torsion spring system
• Sufficient side clearance for the hoist assembly
• A compatible standard, high-lift or vertical-lift configuration, as determined by the installer

Verify the shaft diameter before ordering. This model is not interchangeable with the 1-inch-bore version.

Important Matching Notes

The 1-1/4-inch measurement refers to the hoist bore and the torsion shaft diameter it is designed to fit.

Do not select the hoist based only on the garage door’s width or height. Confirm the shaft diameter, shaft keyway, mounting clearance, door balance and required hand-chain length.

The chain hoist is intended to operate a correctly balanced garage door. It is not designed to compensate for broken, incorrectly sized or improperly adjusted torsion springs.

Installation Requirements

Installation may require:

• Properly sized shaft key
• Suitable shaft mounting location
• Secure hand-chain keeper mounting
• Correct shaft alignment
• Adequate side-room clearance
• Additional galvanized hand chain for taller doors

The hand chain should hang at a convenient operating height without dragging on the floor or interfering with the doorway.

Installation & Safety

The garage door must be properly balanced before the chain hoist is installed or operated. An unbalanced door may be difficult to control and can overload the hoist or other door components.

Secure the door against movement before working near the torsion shaft. Garage door torsion springs, cables, drums and shafts can be under extreme tension.

Installation should be performed by a qualified garage door technician familiar with commercial sectional-door hardware and torsion systems.

SEO Title: JRG V2 Chain Hoist 1-1/4-Inch Bore | 4.5:1 Garage Door Hoist

Meta Description: JRG V2 gear-reduced garage door chain hoist for 1-1/4-inch keyed shafts. Features a 4.5:1 reduction ratio and includes 26 ft of galvanized hand chain, chain keeper and shaft collars.