JR Shaft-Mounted Garage Door Chain Hoist – 1-1/4-Inch Bore, 4:1 Reduction

Product Description

The JR shaft-mounted garage door chain hoist is a manual operator designed for sectional overhead doors equipped with a 1-1/4-inch keyed torsion shaft.

Its 4:1 gear-reduction system provides mechanical advantage to make properly balanced commercial and industrial garage doors easier to open and close manually. The hoist mounts on the torsion shaft and transfers motion through a sprocket-and-roller-chain drive system.

Features

• Shaft-mounted manual garage door operator
• Designed for a 1-1/4-inch keyed shaft
• 4:1 gear-reduction ratio
• 41B36 drive sprocket
• Uses #41 roller chain
• Requires only a 3/8-inch minimum shaft centerline offset
• Includes 26 feet of hand chain
• No electrical power required
• Suitable for properly balanced sectional overhead doors
• Ideal for commercial, industrial, agricultural and warehouse applications

How It Works

Pulling the hand chain rotates the hoist mechanism. The internal gear reduction transfers movement through the included sprocket and #41 roller chain, turning the garage door torsion shaft to raise or lower the door.

The 4:1 reduction decreases the pulling effort required compared with direct-drive manual operation.

Package Contents

• JR shaft-mounted chain hoist
• 41B36 sprocket with 1-1/4-inch bore
• 26 ft of hand chain
• 22 in of #41 roller chain
• Hand-chain keeper
• Two shaft collars
• 1/4-inch square shaft key
• Wall stabilizer bracket

The package contents and specifications correspond to model CHS401-114, also cross-referenced as OMI 4020.

Compatibility & Fitment

Designed for compatible sectional overhead garage doors with:

• A 1-1/4-inch keyed torsion shaft
• At least 3/8 inch of shaft centerline offset
• Adequate space for the sprocket and roller-chain assembly
• A properly balanced torsion spring system
• Sufficient clearance for the hanging hand chain

This model is not interchangeable with the JR chain hoist made for a 1-inch shaft. Confirm the shaft’s outside diameter before ordering.

Important Matching Notes

The 1-1/4-inch measurement refers to the bore of the included sprocket and the torsion shaft it fits.

Do not select a chain hoist solely according to the garage door’s width or height. Verify the shaft diameter, keyway, available mounting clearance and roller-chain alignment.

This hoist is intended to operate a correctly balanced garage door. It will not correct broken springs, incorrect spring sizing, binding tracks or damaged door hardware.

Installation Requirements

Installation requires correct alignment between the hoist sprocket and the drive sprocket on the torsion shaft. The #41 roller chain must be properly sized, aligned and tensioned.

The included wall stabilizer bracket should be securely installed to prevent unwanted movement of the hoist assembly. Mount the hand-chain keeper at a convenient height where the chain will not obstruct the doorway.

Additional hand chain or roller chain may be required depending on the door height and mounting arrangement.

Installation & Safety

Secure the garage door against movement before working near the torsion shaft, cable drums or spring assembly.

Test the door balance before operating it with the hoist. Excessive pulling force may indicate a spring, cable, track or alignment problem.

Garage door springs, cables, drums and shafts may be under extreme tension. Installation should be performed by a qualified commercial garage door technician.

SEO Title: JR Garage Door Chain Hoist 1-1/4-Inch Bore | 4:1 Reduction

Meta Description: JR shaft-mounted garage door chain hoist for a 1-1/4-inch keyed shaft. Features 4:1 reduction and includes a sprocket, hand chain, #41 roller chain, collars, key, keeper and stabilizer bracket.