LiftMaster 655208118STK Dual-Trolley Modification Kit – 18', 3/4 HP and Higher Model T Operators

Stabilize the drive system on a very wide standard-lift sectional door with this LiftMaster 18-foot dual-trolley modification kit. The dual-track arrangement distributes the operator’s pulling force across two door-arm locations instead of relying on one centered trolley connection.

Specifications:

• Brand: LiftMaster

• Product type: Dual-trolley modification kit

• Operator series: Model T drawbar operator

• Operator power: 3/4 HP or higher

• Door height / track length: 18'

• Recommended door width: Greater than 22'

• Door type: Standard-lift sectional door

• Drive-chain configuration: #41 chain for 3/4 HP and higher operators

• Product number: 655208118STK

Compatibility:

• Designed for qualifying LiftMaster Model T trolley operators

• Intended for 3/4 HP and higher operator configurations

• Intended for 18-foot-high door and track applications

• Used on very wide standard-lift sectional doors

• Not automatically compatible with Model GT, MAXUM TDC, jackshaft, hoist, rolling-door, high-lift, or vertical-lift applications

Related Dual-Trolley Kits:

• 655208112STK: 12', 3/4 HP and higher Model T

• 655208114STK: 14', 3/4 HP and higher Model T

• 655208116STK: 16', 3/4 HP and higher Model T

• 655208118STK: 18', 3/4 HP and higher Model T

• 65520812STK through 65520818STK: Related 1/2 HP Model T configurations using the appropriate #48-chain arrangement

The modification uses two trolley tracks connected through a cross-header shaft and sprocket system. Correct track spacing, alignment, shaft support, chain selection, and equal trolley positioning are essential for proper operation.

Depending on the exact configuration, the kit may include specialized trolley-drive components, door arms, brackets, bearings, sprockets, idlers, a slider, coupling components, and installation hardware. Confirm the current LiftMaster packing list before ordering.

This kit is not a complete commercial operator. The Model T operator and any components not identified in the packing list must be purchased separately.

Installation should be engineered and completed by a qualified commercial door technician. Disconnect and lock out operator power, support the door, align both tracks, and connect both door arms before activating the operator.

Order LiftMaster 655208118STK for an approved 18-foot, 3/4 HP-or-higher Model T dual-trolley installation on a standard-lift sectional door wider than 22 feet.