LiftMaster CHAINTENSDC MAXUM Commercial Operator Chain Tensioner – 1" Door Shaft

Maintain proper drive-chain spacing and tension on a compatible LiftMaster MAXUM commercial door operator installation with the CHAINTENSDC tensioner and spreader-bar kit. It is designed for applications using a 1-inch door shaft.

Specifications:

• Brand: LiftMaster

• Product type: Chain tensioner / spreader bar

• Operator family: MAXUM DC commercial operators

• Door-shaft size: 1"

• Application: Standard-duty and industrial-duty commercial operators

• Production compatibility: Qualifying operators manufactured after 2023

• Product number: CHAINTENSDC

Compatibility:

• Compatible with qualifying LiftMaster MAXUM DC JDC, JHDC, and related commercial operator configurations

• Use only on installations specifying a 1-inch door shaft

• Verify the exact operator model, duty rating, shaft diameter, sprocket arrangement, and mounting configuration

• Not a universal tensioner for older Logic-series operators

• Not the correct version for a 1-1/4-inch door shaft

Cross-Reference:

• CHAINTENSDC: Chain tensioner for a 1" shaft

• CHAINTENS125DC: Related chain tensioner for a 1-1/4" shaft

• CHNGUARD: MAXUM chain guard kit

• FOHMODDC: MAXUM front-of-hood mounting bracket kit

• HOISTMOUNTMODDC: MAXUM JDC/JHDC hoist-mount bracket kit

Choose between CHAINTENSDC and CHAINTENS125DC by measuring and confirming the door shaft. The two versions should not be interchanged.

This listing is for the chain-tensioner kit only. The operator, door shaft, drive and driven sprockets, roller chain, chain guard, shaft keys, and mounting bracket are not included unless expressly stated.

Disconnect and lock out all electrical and battery power before installation. A qualified commercial door technician should align the shafts and sprockets, establish correct chain tension, tighten all hardware, and confirm that the chain does not bind throughout a complete operating cycle.

Order LiftMaster CHAINTENSDC when a qualifying post-2023 MAXUM commercial operator installation requires the 1-inch-shaft chain-tensioner and spreader-bar configuration.