Chain Hoist Shaft Mount 4:1 Reduction

Upgrade your sectional or rolling garage door with the JR-ST Chain Hoist Manual Door Operator. Designed for jackshaft mounting on a 1" torsion bar, this robust manual garage door chain hoist delivers a 4:1 mechanical reduction—ideal for commercial or industrial doors requiring reliable manual lift capability.

The JR-ST operator includes all essential components for a smooth and secure installation, including a 22" #41 roller chain, 26' of hand chain, wall bracket, shaft collars, and more. Its external chain and sprocket drive system ensures high-efficiency operation, while its compatibility with a wide range of mounting types provides installation flexibility. Whether you’re setting up a new door system or replacing an existing one, the JR-ST chain hoist offers the durability, performance, and ease-of-use professionals trust.

Product Highlights:

• Model: JR-ST
• Part Number: 9-8-10N
• Alternate SKU: JR-ST-1
• Mounting Style: Jackshaft mount for 1" torsion bar
• Reduction Ratio: 4:1
• Chain Type: #41 Roller Chain
• Includes:
• 22" of #41 roller chain
• 26 ft. of hand chain
• Chain keeper
• 2 shaft collars
• Wall bracket
• 1/4" shaft key
• Sprocket
• Applications: storage facilities, mini warehouses, ad commercial applications

Installation Overview

• Shaft Mounted (1:1, JR-ST, JR-RD, JRG):
• Mount unit to shaft and align sprockets
• Use shaft keys, set screws, and collars to secure in place
• Install roller chain with connector link
• Secure wall bracket to reduce swing
• Wall Mounted (3:1 or 4:1 models):
• Attach sprocket to shaft
• Mount hoist to wall ensuring proper chain tension
• Align sprockets, install roller chain accordingly
• General Chain Setup:
• Loop hand chain around pocket wheel (add extra if door is greater than 14ft)
• Adjust to hang ~1 ft. from floor
• Use pliers to open/close a link to complete loop
• Secure chain with wall-mounted chain keeper