J.R.G. V2 Sectional Garage Door Chain Hoist for 1" Shaft
Gear-reduced jackshaft chain hoist designed for smooth, controlled manual operation of compatible commercial sectional garage doors.
The J.R.G. V2 Sectional Door Chain Hoist mounts directly onto a compatible 1-inch keyed solid torsion shaft. It provides a dependable floor-level operating system for commercial sectional garage doors where an electric operator is not required or available.
Its internal 4.5:1 gear reduction multiplies the operator’s pulling force, making a properly balanced door easier to raise and lower by hand. The enclosed gear-drive design eliminates the exposed roller-chain drive used on some other shaft-mounted hoists, creating a compact and controlled operating assembly.
4.5:1 Gear Reduction Reduces the effort required to manually operate a properly balanced sectional garage door.
Internal Gear Drive Uses an enclosed gear mechanism without an exposed drive chain or separate shaft sprocket.
Complete Installation Kit Includes the hand chain, chain keeper, shaft collars, support bracket, and shaft key.
Key Features
- J.R.G. V2 manual sectional-door chain hoist
- Designed for a compatible 1" keyed solid torsion shaft
- Jackshaft-mounted installation
- 4.5:1 internal gear reduction
- Requires a minimum shaft offset of approximately 3-3/8"
- Allows controlled garage door operation from floor level
- Enclosed gear-drive design helps protect operating components
- Two shaft collars help hold the hoist in position
- Wall L-bracket helps stabilize the hoist during operation
- Suitable for compatible commercial and industrial sectional doors
- Designed for professional overhead-door installation
Kit Includes
- J.R.G. V2 internal gear-drive chain hoist
- Approximately 26' of galvanized hand chain
- 1 hand-chain keeper
- 2 shaft collars
- 1 stabilizing wall L-bracket
- 1/4" shaft key
- Related hoist installation components supplied with the assembly
Product Specifications
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Supplier: Service Spring Corporation
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SSC Product Number: 726
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Reference Part Number: 126689
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Product Type: Sectional garage door manual chain hoist
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Mounting Style: Jackshaft mounted
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Reduction Ratio: 4.5:1
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Drive Type: Internal gear drive
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Shaft Compatibility: 1" keyed solid shaft
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Shaft Key: 1/4"
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Minimum Shaft Offset: Approximately 3-3/8"
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Included Hand Chain: Approximately 26'
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Door Type: Compatible sectional overhead doors
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Package Quantity: One complete chain-hoist kit
Common Applications
- Commercial sectional overhead doors
- Warehouse and loading-area doors
- Automotive service-bay doors
- Agricultural and utility-building doors
- Industrial sectional garage doors
- Doors requiring dependable manual operation without an electric operator
Solid Keyed Shaft Required: This hoist is designed for a compatible 1-inch solid shaft with a keyway. It should not be installed on an unkeyed, undersized, oversized, damaged, or incompatible hollow shaft unless specifically approved by the manufacturer.
Minimum Shaft Offset: The installation requires at least approximately 3-3/8 inches between the torsion-shaft centerline and the supporting wall or mounting surface. Verify that the hoist housing, hand chain, collars, and stabilizing bracket have sufficient clearance.
Hand-Chain Length: The included 26-foot hand chain is formed into a continuous operating loop. Doors higher than approximately 15 feet may require additional compatible hand chain. The completed loop should remain accessible while staying clear of the floor and pedestrian traffic.
Dimensions Notice: Overall housing height, width, depth, internal gear dimensions, shaft-engagement length, wall-bracket hole spacing, and maximum rated door weight were not published in the accessible product listing. Confirm all available shaft and wall clearances before ordering.
Compatibility Notice
Verify the 1-inch solid keyed shaft, 1/4-inch keyway, minimum 3-3/8-inch shaft offset, available shaft length, mounting side, door type, total door weight, door balance, hand-chain length, side clearance, and structural wall-bracket location before ordering. This model is intended for sectional doors and should not be substituted for a rolling-door hoist without manufacturer approval.
Important Operation Notice: A chain hoist is designed to operate a properly balanced and freely moving garage door. Do not use the hoist to force a door with broken springs, damaged tracks, seized bearings, jammed rollers, obstructed sections, or excessive resistance.
Safety Warning: Garage door shafts, springs, hand chains, cable drums, and lifting cables can cause serious injury if improperly installed or serviced. Secure the door, keep hands and clothing away from moving parts, and completely release spring tension whenever the installation procedure requires shaft or torsion-system service. Professional installation is strongly recommended.
