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LiftMaster 3900 Support Question

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Question posted by cobra66 on July 15th, 2011

How Mush Of The Shaft Has To Stick Out To Connect This Opener? I Have About 1'

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Answer #1: Posted by lkelch on August 7th, 2011 10:10 AM

This answer was accepted by the poster of the original question.

lkelch

Member since:
August 7th, 2011

Points: 1,160

1,110
points

You must have 1 to 5 inches past the bearing plate and must be a 1 inch torsion bar with tortion springs.

AlphaHozer

Related LiftMaster 3900 Manual Pages

3900PLD Manual - Page 1

... ■ Please read this manual and the enclosed safety materials carefully! ■ Fasten the manual near the door after installation. ■ The door WILL NOT CLOSE unless The Protector System® and cable tension monitor are connected and properly aligned. ■ Periodic checks of the operator are required to ensure safe operation. ■...

3900PLD Manual - Page 2

...safety instructions 7 Position the operator 7 Attach the emergency release rope and handle 8 Install power door lock (Not Provided 8 Attach the cable tension monitor (Required 9 Install the single button control...monitor 20 To open door manually 20 Operation 21-25 Operation safety instructions 21 Using your door operator 21 Care of your garage door and/or the garage door operator if you...

3900PLD Manual - Page 3

... installation. Must have minimum of 2-1/2" (6.4 cm) between floor Sensor and bottom of door must not exceed 1/4" (6 mm). 3 Must have minimum of 3" (7.6 cm) between the floor and the bottom of the door must extend at least 1" to 5" (2.5 cm to the garage, as you proceed with the installation of your operator. Motor unit Cable Tension...

3900PLD Manual - Page 4

...; Disable ALL locks and remove ALL ropes connected to door BEFORE installing and operating door operator to make sure your door binds, sticks or is out of balance, call a trained door systems technician if door binds, sticks or is not sticking or binding: 1. If your door is balanced and is out of door operation per Hour Stepladder 12 Drill Tape Measure...

3900PLD Manual - Page 6

Ensure that the collar is seated all the way on motor shaft until stop is reached (Figure 1). • Position the collar so that the screws are for...(12-14 ft./lbs. ASSEMBLY STEP 1 Attach the Collar to the Operator To avoid installation difficulties, do not run the door operator until instructed to do so. • Loosen the collar screws. • Attach collar to either the left side ...

3900PLD Manual - Page 7

.... • ALWAYS call a trained door systems technician if door binds, sticks or is too long or damaged. 3. Install wall-mounted door control: • within sight of the door. • out of reach of ...Disable ALL locks and remove ALL ropes connected to door BEFORE installing operator to do so. 7. Place manual release/safety reverse test label in a door roller. It may not reverse when ...

3900PLD Manual - Page 8

... to cut the rope, heat seal the cut end with a match or lighter to the outside of the garage door track with hardware provided. 5. Weak or broken springs or unbalanced door could result in an open door falling rapidly and/or unexpectedly. • NEVER use emergency release handle to achieve a 3" (7.6 cm) distance between the center...

3900PLD Manual - Page 9

...tip Screw #6 (2) Wall Anchor (2) 9 Attach the cable tension monitor to the green quick-connect terminals (polarity is shipped for left side installation. The cable tension monitor MUST be no ...same side of the cable. 5. NOTE: Cable must be connected and properly installed before the door operator will reverse the door when excessive slack is located over a wood support member....

3900PLD Manual - Page 10

... (1.5 m) and away from electrocution: • Be sure power is not connected BEFORE installing door control. • Connect ONLY to cross path of closing door: • Install door control within sight of door, out of reach of door. • NEVER permit children to door travel. • ALWAYS keep door in place for proper operation. Fasten the warning placards to the...

3900PLD Manual - Page 12

... installation difficulties, do not run the operator at this time. To make a permanent connection through conduit, cut to make it fit outlet. Reinstall operator to torsion bar. •... Be sure the operator is not connected to the operator, and disconnect power to circuit BEFORE removing cover to establish permanent wiring connection. • Door installation and wiring MUST be in ...

3900PLD Manual - Page 14

...sectional doors without additional hardware. above floor Invisible Light Beam Protection Area Facing the door from a closing door: • Correctly connect ...beam. This required safety device MUST NOT be installed inside the garage 14 Safety Reversing Sensor 6" (15 cm) max. If ... light beam while the door is closing , the door will stop and reverse to full open position, and the operator...

3900PLD Manual - Page 16

...3. Figure 6 To CableTension Monitor Bell Wire Motor unit Bell Wire Connect Wire to grey (Figure 6). Be sure the lens is already open wire to the operator. • A short in both safety ...to connect to the operator quick-connect terminals: white to white and white/black to Quick-Connect Terminals Sensor Connections WHT/RED WHT WHT/BLK WHT To Door Control Quick-Connect Terminals...

3900PLD Manual - Page 17

... the door is binding or sticking. Immediately when the door begins to stop the door. Once the door is closed, if there appears to Set the Force. Black moves the door UP (open ) position. Push and hold until the door reaches the desired DOWN (closed position. 7. Repair door first. • Incorrect adjustment of the door by a closing the door (Figure 3). 4. Door MUST...

3900PLD Manual - Page 18

... time to enter into Force Adjustment Mode BLACK PURPLE Figure 3 18 If the garage door opener cannot open and close (DOWN). 3. If the door is not stopping exactly where you would like it is balanced properly and is binding or sticking. Push the door control or programmed remote control. Figure 1 LED Purple Button Black Button Figure 2 Push...

3900PLD Manual - Page 19

... (or a 2x4 laid flat) on the floor, centered under the door. • Operate the door in the down direction. ADJUSTMENT STEP 3 Test the Safety Reversal System TEST • With the door fully open the door. • Place the operator carton in the path of the door. • Press the remote control push button to close from...

3900PLD Manual - Page 23

... operate from the Single Button Control Station: • Are the wiring connections correct? If it is complete. 8. The door opens but won 't work: • The door springs may have electric power? For an existing installation, see installation step 4). • Is something obstructing the door? The door reverses for no apparent reason: • Check the safety reversing...

3900PLD Manual - Page 24

... operator is connected, the operator should be opened and closed manually. When power is restored, pull manual release a second time. • If a Standby Power Unit is mounted at a right angle to disconnect the door. The operator moves when the door is in ... (Continued) 12. If not, move the position of the mounting bracket. 24 Door loses limits. • Collar not tightened securely.

3900PLD Manual - Page 25

...garage door...eye sensor, clean lens and secure brackets. • Verify door track is properly connected to operate motor unit, check diagnostic code. • ...door control/wires for the sensors. The "Learn" button/diagnostic LED will not operate replace logic board. Motor Unit "Learn" Button LED or Diagnostic LED "Learn" Button Diagnostic Chart 1 FLASH Safety reversing sensors wire open...

3900PLD Manual - Page 27

... an existing, known PIN If the existing PIN is installed, the light will no longer open the door. Press the new 4-digit PIN you have chosen, then press Enter. After a programmed ...Release the button. 2. The operator light will blink three times. The door should move. Press the four buttons for your garage door operator. To Add, Program or Change a Keyless Entry PIN (Not ...

3900PLD Manual - Page 28

... the Single Button Control Station (or hand-held remote control or keyless entry, if programmed). 3. Programming Remote Light (Not Provided) The garage door operator remote light will need to be programmed to program the light. 1. It has learned the code and the light turns on light until LED ...