Screen Reader users press enter to Limit by product. Screen Reader users press enter to Limit by category. Find the answer to your question Suggestions:Make sure all words are spelled correctlyUse different words that mean the same thing How to program a remote control How to add, program or change a Keyless Entry PIN Why do the lights on my garage door opener flash and my door will not close? How do I contact Chamberlain Technical Support? How do I erase the remote control from the garage door opener's memory? How do I adjust the travel and force limits? How to align safety reversing sensors How to set up Wi-Fi for the MyQ® Garage LiftMaster® Garage Door Opener Model 8500 Owner's Manual < Previous 1 2 3 4 5 6 Next >Get expert tips and advice while watching our pros install, program and troubleshoot Chamberlain products. Find more installation videos and learn about new product innovations on Chamberlain’s YouTube channel.
Learn how to install your new Chamberlain garage door opener and accessories!How do I adjust the travel and force limits? Limit adjustment settings regulate the points at which the door will stop when moving up or down. After adjusting the limit settings, check the Safety Reversal System and Test the Protector System. Note: Manual travel and force adjustments are adjusted using a flathead screw driver. To operate the opener, press the door control push bar. Run the opener through a complete travel cycle. Does the door open or close completely? Does the door stay closed and not reverse unintentionally when fully closed? If your door passes both of these tests, no limit adjustments are necessary unless the reversing test fails. Adjustment procedures are outlined below. Run the opener through a complete travel cycle after each adjustment. Step 1: Adjust the UP and DOWN Travel LimitsStep 2: Adjust the ForceStep 3: Test the Safety Reversal System Step 4: Test the Protector System
Repeated operation of the opener during adjustment procedures may cause the motor to overheat and shut off. Simply wait 15 minutes and try again. If anything interferes with the door’s upward travel, it will stop. If anything interferes with the door’s downward travel (including binding or unbalanced doors), it will reverse. Without a properly installed safety reversal system, persons (particularly small children) could be SERIOUSLY INJURED or KILLED by a closing garage door. Incorrect adjustment of garage door travel limits will interfere with proper operation of safety reversal system. After ANY adjustments are made, the safety reversal system MUST be tested. Door MUST reverse on contact with 1-1/2" (3.8 cm) high object (or 2 x 4 laid flat) on floor. To prevent damage to vehicles, be sure fully open door provides adequate clearance. How and when to adjust the limits:Turn the UP limit adjustment screw clockwise. One turn equals 2" (5 cm) of travel.
NOTE: To prevent the trolley from hitting the cover protection bolt, keep a minimum distance of 2-4" (5 cm - 10 cm) between the trolley and the bolt. Adjust the UP (open) force as explained in Adjustment Step 2.Turn the DOWN limit adjustment screw counterclockwise. If door still won't close completely and the trolley bumps into the pulley bracket, try lengthening the door arm (page 18) and decreasing the down limit. If the opener reverses in fully closed position:Turn the DOWN limit adjustment screw clockwise. If the door reverses when closing and there is no visible interference to travel cycle: If the opener lights are flashing, the Safety Reversing Sensors are either not installed, misaligned, or obstructed. Test the door for binding: Pull the emergency release handle. Manually open and close the door. If the door is binding or unbalanced, call for a trained door systems technician. If the door is balanced and not binding, adjust the DOWN (close) force.
See Adjustment Step 2. Step 2: Adjust the Force Too much force on garage door will interfere with proper operation of safety reversal system. NEVER increase force beyond minimum amount required to close garage door. NEVER use force adjustments to compensate for a binding or sticking garage door. If one control (force or travel limits) is adjusted, the other control may also need adjustment.Door MUST reverse on contact with 1-1/2" high (3.8 cm) object (or 2 x 4 laid flat) on floor. How and when to adjust the forces: Test the DOWN (close) force If the door reverses during the down (close) cycle and the opener lights aren't flashing, INCREASE DOWN (close) force by turning the control clockwise. Make small adjustments until the door completes a close cycle. After each adjustment, run the opener through a complete travel cycle. Do not increase the force beyond the minimum amount required to close the door. Test the UP (open) force If the door doesn't open at least 5 feet (1.5 m), INCREASE UP (open) force by turning the control clockwise.
Make small adjustments until door opens completely. Readjust the UP limit if necessary. After each adjustment, run the opener through a complete travel cycle. Step 3: Test the Safety Reversal System Safety reversal system MUST be tested every month.Door MUST reverse on contact with 1-1/2" (3.8 cm) high object (or 2 x 4 laid flat) on the floor Press the remote control push button to close the door. The door will not move more than an inch (2.5 cm), and the garage door opener lights will flash 10 times. The garage door opener will not close from a remote control if the LED in either safety reversing sensor is off (alerting you to the fact that the sensor is misaligned or obstructed). If the garage door opener closes the door when the safety reversing sensor is obstructed (and the sensors are no more than 6 inches [15 cm] above the floor), call for a trained door systems technician. Answers others found helpful How do I program the travel and force limits using black and purple or black and yellow buttons?