Single Spring Counterbalance (Operator) – Installing & Adjusting
From TODCO, this video demonstrates the process for installing and adjusting a single spring counterbalance (operator) for a trailer’s roll-up door.
Training Video
- Title: Single Spring Counterbalance Install & Adjustment
- Source: TODCO
- Run Time: 6:22
High-tension springs can cause severe injury or death. Repairs and adjustments must be made by trained Service Technicians.
Spring Winding
- To determine the amount of winds on the counterbalance spring, divide 10 into the door opening height in inches and add 3 turns.
- Example: 75 divided by 10 = 7.5 turns + 3 turns = 10.5 or 10 and one-half turns.
- Run a chalk mark the full length of the counterbalance spring. Leave the vice grip clamped to the shaft to keep tension on the cables.
- Place a 1/2″ diameter x 18″ winding bar in the hole in the spring winding plug. Wind the spring by lifting up the bar. While holding the first bar, place a second bar in the next hole and lift in the same manner after removing the first bar. Repeat this until the correct number of complete turns are obtained by counting the chalk marks which show up as stripes as the spring is wound.
- Properly tighten both set screws on the spring winding plug and remove the vice grips from the counterbalance shaft.