Viking Access T21GB80K Worm Gearbox for T21NX

Replacement Worm Gearbox for T21NX Next-Generation Swing Gate Operators

The Viking Access T21GB80K is a worm gear drive assembly built specifically for the Viking Access T21NX next-generation swing gate operator. The gearbox transfers motor torque into controlled output at the operator's drive shaft, governing gate travel speed and holding force during normal cycling. When a worm gearbox wears, installers typically observe symptoms such as drivetrain grinding, increased backlash, inconsistent gate movement, or loss of holding torque at the closed position. Replacing the gearbox with the correct OEM unit restores controlled motion and removes uneven loading from the rest of the operator drivetrain.

The T21GB80K is dedicated to the next-generation T21NX platform and is not interchangeable with the original-generation Viking Access T21 operator, which uses the T21GB80 gearbox. Both operator generations remain in active service in the field, so confirming the operator generation before ordering is required. The K suffix is the indicator of next-generation compatibility.

Key Features

• Worm gear drive gearbox for the Viking Access T21NX next-generation swing gate operator
• 30:1 gear ratio with #80 worm gear for controlled torque output and gate travel
• Addresses drivetrain symptoms tied to gearbox wear, including grinding, backlash, and inconsistent movement
• Restores correct motor-to-output torque transfer when the original gearbox has failed or worn
• Dedicated to the T21NX generation; the original-generation T21 uses a different gearbox (T21GB80)
• K suffix in the part number identifies the next-generation T21NX-compatible version

Technical Specifications

• Part Number: T21GB80K
• Component Type: Worm gearbox assembly
• Drive Type: Worm gear
• Worm Gear Size: #80
• Gear Ratio: 30:1
• Compatible Operator: Viking Access T21NX next-generation swing gate operator
• Not Compatible With: First-generation Viking Access T21 operator (uses T21GB80)
• Application: Swing gate operator drivetrain replacement
• Manufacturer: Viking Access Systems

Conclusion

The T21GB80K fits the Viking Access T21NX next-generation operator only. If the operator is an original-generation T21, the correct gearbox is the T21GB80 without the K suffix. Both generations remain active and look similar externally, so verify the operator model and generation on the unit nameplate or in the original purchase documentation before ordering. When replacing the gearbox, inspect the drive shaft, coupling, and motor output for concurrent wear.