There could be several issues preventing your door from lifting easily.
Garage door too heavy to lift manually.
Usually a properly working garage door will roll open easily due to the torque in the springs but it is important to lift with your back straight up.
If the spring is to small the door will be difficult to open if the spring is to large the door will be difficult.
Lift up the door halfway from the inside using one of the cross members.
Position a stepladder at the area of the automatic opener.
We recommend having a maintenance done to your garage door every 12 to 18 months.
Open the door fully by hand.
Unplug the power cord to the opener.
Instead you want to lift with your lower body as if you are picking up a heavy box.
If your garage door spring is failing or broken it will not provide enough force to lift the garage door.
If the spring is not the proper size the door will not be balanced.
Consider updating the drums that guide the lifting cables.
Pull the emergency cord on your door opener and gently lift your garage door.
Close the garage door.
Is your garage door hard to lift by hand.
So my 2 car garage door takes at least 30 50lb to lift manually.
Many older drums are not correct for doors with heavy top sections such as those with windows.
Raynor s new trubalance drums can provide 87 better balance throughout the full open close motion.
Bending over and attempting to put your weight into the door may result in lower back injuries.
I had a company came and replaced the spring once years ago and the guy must not have wound it to the correct amount.
I was thinking about taking a couple steel rods and adjust the torsion spring myself.
When the garage door spring is working properly a 200 pound door would feel weightless but when one or both springs break you will feel the weight when you work the door manually.
If the door remains at the halfway position.
A properly balanced garage door weighs about 10 to 15 pounds which can easily be lifted with one hand.
The result will be that the door will be too heavy to lift by yourself or the opener because a standard garage door opener is only designed to move the door with 10 pounds of pressure.