The LiftMaster K41-0157-000 is the right-side cable tension monitor for select MAXUM Series DC commercial door operators. A cable tension monitor, often called a slack-cable monitor, helps detect loss of cable tension on sectional or high-lift door systems. When the monitor senses a slack or unsafe cable condition, the operator can stop or reverse depending on the system design, helping reduce the risk of cable drum unspooling, door damage, and unsafe operation. This right-hand kit is intended for MAXUM DC models including JDC, JHDC, and TDC where the installation uses a right-side CTM. It should be selected by side and operator model, not by appearance alone. Left- and right-side kits are different part numbers and both sides may be recommended or required depending on the door and operator installation.
Do not bypass a cable tension monitor or operate a commercial door with slack cables. Cable, spring, and commercial door service can be dangerous and should be handled by a qualified commercial door technician.
Yes. K41-0157-000 is the right-side cable tension monitor kit. The left-side version is K41-0156-000.
This right-side CTM is commonly listed for LiftMaster MAXUM DC JDC, JHDC, and TDC commercial door operators.
No. Do not bypass this safety-related device. Find and correct the slack-cable, wiring, door balance, or sensor issue before returning the door to service.
