One of the most common problems with a block and tackle window balance is when the rope which runs on the pulley wears. This wear comes over time because most ropes used in the block and tackle window balance are made of nylon. Once a rope on one side of the window begins to wear, the window becomes difficult to open or keep open.
Balance Breaks Off
A balance device is located on either side of the window of the block and tackle window balance. The balance of the device can break off or fall off over time and use. The balance allows the window sash to be opened and closed smoothly as well as keep the window open to the desired height. Once the balance falls off, the window sash cannot be opened or closed easily.
Ropes Jumps Pulley
The block and tackle window balance works on a pulley device which rotates with the ropes threaded through the pulley grooves. These sheaves guide the rope on either side of the block and tackle window balance and keep the rope separated as the window sash travels in an up-and-down motion. The ropes can jump the pulley device or sheaves of the pulley, jamming up one side of the window sash or the rope can tangle, jamming the window sash in place.
The pulley on the block and tackle window balance can jam over time. The pulley rotates as the window sash is opened and closed. Once the pulley jams, the window sash will not operate smoothly on one side. The window sash will become hard to open on one side and can become misaligned on the travel guides.