
LINEAR LLC
USA & Canada (800) 835-5666 & (800) 421-1587
Toll Free FAX (800) 468-1340
(760) 438-7000
www.linearcorp.com
MODEL LSO50 
BELT-DRIVE OR CHAIN-DRIVE 
GARAGE DOOR OPERATOR
INSTALLATION INSTRUCTIONS 
For Sectional and Jamb Type Doors
IMPORTANT SAFETY NOTES
Please read the instructions carefully! This garage door 
operator is designed to provide safe and reliable service 
if installed and tested as described in these instructions. 
A garage door is the largest mechanical appliance in a 
residence. Care must be taken to prevent injury or death 
during installation and operation of the garage door and 
garage door operator.
 WARNING 
This type of warning note is used to indicate 
possible electrical shock hazards that may 
cause serious injuries or death.
THE FOLLOWING FORMATS ARE USED FOR 
SAFETY NOTES IN THESE INSTRUCTIONS.
 WARNING 
This type of warning note is used to indicate 
possible mechanical hazards that may cause 
serious injuries or death.
CAUTION
This type of warning note is used to indicate 
the possibility of damage to the garage door or 
garage door operator.
IMPORTANT INSTALLATION SAFETY INSTRUCTIONS
WARNING
TO REDUCE THE RISK OF SEVERE INJURY OR DEATH TO PERSONS, REVIEW 
THESE INSTALLATION SAFETY STEPS BEFORE PROCEEDING
1 READ AND FOLLOW ALL INSTALLATION INSTRUCTIONS.
2 Install only on a properly balanced garage door. An improperly balanced door could result in severe 
injury or death. Repairs to cables, spring assemblies, and other hardware must be made by a qualified 
service person before installing the operator.
3 Disable all locks and remove all ropes connected to the garage door before installing the operator. 
Ropes connected to a garage door can cause entanglement and death.
4 If possible, install door operator 7 feet or more above the floor with the manual release handle 
mounted 6 feet above the floor.
5 Do not connect the operator to the power source until instructed to do so.
6 Locate the wall station within sight of the door at a minimum height of 5 feet so that small children 
cannot reach it. Locate the wall station away from all moving parts of the door.
7 Install the User Safety Label on the wall adjacent to the wall station.
8 Upon completion of the installation, the door must reverse when it comes in contact with a 1-1/2” high 
object (or a 2x4 laid flat at the center of the door) on the floor and when the infrared safety beam is 
blocked.
9 Do not wear watches, rings or loose clothing while installing or servicing an operator. Jewelry or 
loose clothing can be caught in the mechanism of the garage door or the operator.
10 DISCONNECT THE ELECTRIC POWER FROM THE GARAGE DOOR OPERATOR BEFORE MAKING 
ANY REPAIRS OR REMOVING THE COVER.
1 Check the Door Balance
1 From outside the garage, slowly open the door all the 
way, and then close it all the way. Notice if there is 
any binding, sticking or rubbing. The door should move 
smoothly in both directions.
2 Raise the garage door about halfway up. Carefully 
release the door and see if the door balances. It should 
stay in place. Close the door.
� IMPORTANT: If the garage door is unbalanced or 
the door travel isn’t smooth, have a qualified garage 
door professional adjust or repair the door.
2 Attach the Rail to the Operator
1 Place the operator head on the garage floor with 
cardboard underneath it to protect the finish.
� NOTE: To prevent upsetting the pre-adjusted door 
limits in the operator, keep the trolley at the same place 
on the rail until the sprocket is on the drive shaft.
2 Align the rail over the center of the operator head.
3 Be sure the flat on the sprocket lines up with the flat on 
the drive shaft.
4 Slide the sprocket onto the shaft.
5 Attach the rail to the operator head by installing four 
¼-20 x ¾” bolts.
6 Tighten the four bolts in the order shown with a 7/16” 
socket.
CAUTION
- BELT RAILS HBT7 ONLY! -
TURN THE OPERATOR’S OPEN LIMIT 4 TURNS IN 
THE DOWN DIRECTION BEFORE OPERATING UNIT.
CHECKING THE DOOR BALANCE
THE DOOR SHOULD 
BALANCE WITHOUT 
GOING UP OR DOWN
ALIGNING THE RAIL
CHAIN DRIVE
MATING THE SPROCKET AND SHAFT
CHAIN DRIVE
ATTACHING THE RAIL
TIGHTEN THE RAIL-TO-HEAD BOLTS IN THIS ORDER
1
2
LINE UP THE RAIL OVER THE DRIVE SHAFT 
ON TOP OF THE OPERATOR HEAD
BE SURE THE FLAT ON THE SPROCKET 
LINES UP WITH THE FLAT ON THE DRIVE SHAFT
TABS FIT INTO SLOTS
INSTALL FOUR 1/4-20 x 3/4" 
RAIL-TO-HEAD BOLTS 
USING A 7/16" SOCKET 
(SEE TORQUE ORDER BELOW)
PULL THE BELT OR CHAIN 
AWAY FROM THE RAIL TO FIT 
THE SOCKET ON THE 
FRONT BOLTS
BELT DRIVE
SLIDE THE SPROCKET 
INTO THE SHAFT
BELT DRIVE
3 Locate the Header Bracket Position
1 Check whether door is a sectional or one-piece jamb type. 
Note the differences in mounting header bracket, 
door arm assembly and hanging the operator.
2 Close the door.
3 From inside the garage, use a pencil to mark the 
vertical centerline of the door on the header wall and 
on the top panel of a sectional door or on the top edge 
of a jamb door.
4 Examine the area above the center of the door on the 
door header wall for a header bracket mounting location.
5 Open the door to the high-rise point (the point where 
the top edge of the door is highest above the floor) and 
measure the distance to the floor.
6 Close the door and use a pencil to mark the header 
wall 1” above (sectional) or 7” above (jamb) the 
measured high-rise point.
� NOTE: In some installations, the header bracket 
location will be higher than the door header. This will 
require adding a 2x4 (or larger) cross piece to the wall 
studs to provide a mounting location for the header 
bracket. Use lag screws (not supplied) to attach the 
2x4 to the studs.
7 On sectional doors with low headroom, the header 
bracket can be attached to the ceiling up to 6” back 
from the header wall (see next step).
MARKING THE CENTERLINE
MARKING ABOVE THE HIGH-RISE POINT
MARK HEADER 
1" ABOVE 
SECTIONAL DOOR JAMB DOOR
HIGH-RISE 
POINT
MARK THE CENTERLINE 
OF THE DOOR ON THE 
HEADER AND THE TOP 
DOOR PANEL
IF JAMB DOOR 
MARK THE TOP 
EDGE OF THE DOOR
HIGH-RISE 
POINT
MEASURE 
DISTANCE 
TO FLOOR
CLOSE DOOR 
AND MARK 
HEADER 7" 
ABOVE
4 Install the Header Bracket
Attaching the Header Bracket to the Wall
1 Hold the header bracket on the center line drawn 
above the door with the bottom edge of the bracket on 
the line marked above the high-rise point.
2 Use a pencil to mark the two bracket holes.
3 Drill two 3/16” pilot holes about 2” deep.
4 Use a ½” socket to fasten the bracket with two 5/16” x 2” 
lag screws.
Attaching the Header Bracket to the Ceiling 
� NOTE: On a finished ceiling, be sure there is a joist 
to fasten to under the sheetrock where the header 
bracket will be located (use a stud finder). If there is 
none, install a 2x4 cross piece between the two closest 
joists to fasten the header bracket onto.
1 Extend the center line drawn on the header wall along 
the ceiling.
2 Hold the bracket on the center line with the edge of the 
bracket no further than 6” from the header wall.
3 Use a pencil to mark the two bracket holes.
4 Drill two 3/16” pilot holes about 2” deep.
5 Use a ½” socket to fasten the bracket with two 
5/16” x 2” lag screws.
ATTACHING THE HEADER BRACKET
1/2" SOCKET
ATTACH HEADER 
BRACKET WITH 
TWO 5/16" x 2" 
LAG SCREWS
ATTACHING THE HEADER BRACKET TO THE CEILING
NO MORE
THAN 6 INCHES
DOOR 
HEADER 
WALL
FOR LOW HEADROOM SECTIONAL 
DOOR INSTALLATIONS ONLY
CENTERLINE OF DOOR
HIGH-RISE POINT 
OF DOOR
CENTERLINE OF DOOR
1 INCH (SECTIONAL) 
2 INCHES (JAMB)
5 Connect the Rail to the Header Bracket
1 Place assembled operator on the empty carton on the 
floor with rail towards the door.
2 Insert the end of the rail into header bracket.
3 Insert the 5/16” x 2-3/8” clevis pin through header 
bracket and rail.
4 Secure the clevis pin with the hitch pin.
CONNECTING THE RAIL
INSERT HITCH PIN 
INTO CLEVIS PIN
2-3/8" LONG 
CLEVIS PIN
6 Hang the Operator
Installation requirements vary with garage construction. 
Hanging brackets should be angled to provide rigid 
support. Hanging material is not provided. Angle iron 
and lag screws are recommended. DO NOT USE NAILS.  
Following are typical operator hanging methods. Cer tain 
installations will require improvised methods. 
1 Raise the operator head and set it on top of a stepladder 
(use extra spacers on top of ladder if it isn’t tall enough).
2 SECTIONAL DOORS: Carefully open the door to the 
full up position. Lay a 2x4 across the top section of the 
door as a spacer. Adjust the operator height until the rail 
touches the spacer. The rail should be close to level.
 JAMB DOORS: Carefully open the door to the high-
rise point. Adjust the operator height until the rail is 2” 
above the door high-rise point. The rail should angle 
up towards the header wall.
3 Center the operator head and rail with the centerline 
mark on the top of the door.
4 For finished ceilings only: An angle iron cross piece 
between the two closest joists above the operator will be 
required. Mark mounting hole locations, drill pilot holes 
and attach the piece with two lag screws (not supplied).
5 Measure the distance from each of the operator’s 
hanging tabs to the ceiling joists or angle iron cross piece.
6 Cut two angle iron pieces to the required lengths for 
hanging brackets. Bend brackets if required.
 • For unfinished ceilings: Hold each bracket in place  
and use a pencil to mark the locations where they will 
be attached to the joists, drill pilot holes and attach the 
pieces with two lag screws (not supplied).
 • For finished ceilings with an angle iron cross piece: 
Attach the two hanging brackets to the cross piece 
with two bolts and two keps nuts (not supplied).
7 Attach operator to hanging brackets using two 5/16-18 x 
1” hex bolts and two 5/16-18 keps nuts (supplied). Insert 
bolts from the inside of hanger brackets with the nuts on 
the outside of the operator. Tighten nuts with a ½” socket.
3
8 Tighten all hanging hardware.
9 Open and close the door manually. The door should 
clear the rail by at least 1”.
10 Attach the trolley’s release lever to the red release 
handle with the cord supplied so the handle is at least 
6 feet from the floor. Cut off any excess cord.
11 Press the light cover release tabs in to open the covers. 
4
Install two 100 watt maximum rough service lamps. 
Swing the light covers closed, snapping them shut.
PREPARING TO HANG THE OPERATOR
ADJUSTING OPERATOR HEIGHT
JAMB DOOR
HANGING BRACKET OPTIONS
TYPICAL HANGING BRACKETS 
SCREWED DIRECTLY TO JOISTS
HANGING THE OPERATOR
HANG THE OPERATOR 
WITH TWO 5/16-18 x 1" 
BOLTS AND NUTS
LIGHT COVER 
RELEASE TAB
PLACE A 2x4 SPACER 
BETWEEN THE DOOR AND RAIL
SECTIONAL DOOR
2" MAXIMUM BETWEEN 
HIGH-RISE POINT AND 
BOTTOM OF RAIL
ADJUST HEIGHT 
AS REQUIRED
TYPICAL HANGING BRACKET 
ASSEMBLY USING A CROSSPIECE
7 Install the Wall Station
 WARNING 
Children operating or playing with a garage door operator can injure themselves or others. The garage 
door could cause serious injury or death. Do not allow children to operate the remote control(s) or 
the wall station. Install the wall station out of reach of children and away from all moving parts of 
the door. The door must be clearly visible from the wall station. A moving garage door could injure 
someone under it. Only activate the door when it is properly adjusted, when it can be seen clearly 
and when there are no obstructions to the door travel.
� NOTE: 22 AWG 2-conductor wall station and safety 
beam wire is supplied with the operator, Use this wire 
or the installation’s pre-wiring. For additional wire, 
contact Linear for information regarding the 24-pack 
Model HAE00009 wire and wire clip kit.
� UL NOTE: All low voltage Class 2 cable used with this 
operator must be UL Listed Type CL2, CL2P, CL2R, or 
CL2X or other cable with equivalent or better electrical, 
mechanical, and flammability ratings.
1 Strip back ½” of insulation and connect a wire to each 
of the two terminals on the back of the wall station.
2 Use the screws provided to mount the wall station near 
an access door at a minimum height of five feet. SEE 
IMPORTANT WARNING ABOVE!
3 For non-prewired installations, route the wire to the 
back of the operator. Use insulated staples (not 
supplied) to secure the wire. Staples must straddle 
both wires to avoid electrical shorts.
4 Cut the wall station wire about 6” longer than needed to 
reach the operator terminals. Strip back ½” of insulation.
5 Connect either wire to the operator’s PUSHBUTTON 
terminal and the other wire to the operator’s COMMON 
terminal. 
6 Apply the User Safety Instruction Label to the wall next 
to the wall station. Use staples or tacks to help the 
label remain in place over time.
� IMPORTANT! DO NOT PLUG THE OPERATOR IN AT 
THIS TIME! More installation is required.
8 Install the Safety Beam
 WARNING 
Persons, particularly children, could be killed 
by a closing garage door without a properly 
installed and adjusted safety beam optical 
obstacle sensing system.
� NOTE: The safety beam’s infrared light beam must 
not be obstructed by the door, or by any part of the 
door hardware. Use wooden spacers between the 
beam brackets and wall if necessary to create proper 
clearance.
1 Assemble the two safety beam brackets from the four 
L-shaped brackets using two ¼-20 x ¾” bolts and 
¼-20 keps nuts (one nut & bolt for each bracket).
 WARNING 
To protect small children, do not install the 
safety beam higher or lower than instructed.
2 Position the assembled brackets on each side of the 
door so the center line of the safety beam lenses  
will be 6” above the floor. Use the index marks on 
the brackets to make the bracket assemblies equal 
lengths. Mark the locations for the bracket mounting 
screws (the brackets can be wall or floor mounted).
� NOTE: The safety beam receiver (the unit with two 
indicators) should be located on the “shady” side of 
the door to prevent sunlight from shining directly into 
the receiver’s lens.
3 Drill two 3/16” pilot holes for lag screws at marks. 
Mount the brackets with two ¼” x 1-1/4” lag screws 
and tighten with a 7/16” socket (or use proper concrete 
fasteners if floor mounting).
4 Insert the sender and receiver into the bracket holes 
so the lenses of the units will face each other. Twist the 
units until the spring clips lock into a detent mark on 
the brackets. To protect the units from being bumped 
after installation, it is recommended to mount the 
sender and receiver inside the brackets as shown.
� IMPORTANT: Be careful to route the safety beam wiring 
away from any moving parts of the door or operator.
5 For non-prewired installations, route the wires from 
the sender and receiver, up the wall above the door 
hardware, then over to the center of the door, then along 
the top of the rail (or ceiling), and back to the operator 
head. Cut the wires about 6” longer than needed to 
reach the operator terminals. Strip back ½” of insulation 
from the ends of the wires.
6 For non-prewired installations, secure all the wires 
to the wall and ceiling with insulated staples (not 
supplied). Staples must straddle both wires to prevent 
shorts. Secure the wire to the top of the rail with wire 
clips (supplied).
7 At the operator, twist one wire from each pair together, 
then twist the other wire from each pair together.
8 Attach either twisted connection to the operator’s 
BEAM terminal. Connect the other twisted connection 
to the operator’s COMMON terminal.
CONNECTING AND LOCATING THE WALL STATION
MOUNTING THE WALL STATION
ROUTE WIRE 
THROUGH 
SLOT IN 
CASE
CONNECTING THE WALL STATION WIRES
CONNECT THE WALL STATION
PUSHBUTTON
WIRES TO 
COMMON
 TERMINALS (EITHER
WIRE TO EITHER TERMINAL)
ASSEMBLING THE BRACKETS
SAFETY BEAM BRACKET OPTIONS
WALL MOUNTING FLOOR MOUNTING
MARKING THE CORRECT BEAM BRACKET HEIGHT
LOCATE THE SAFETY BEAM 
BRACKETS SO THE BEAM 
CENTERLINE IS 6" ABOVE THE FLOOR
INSTALLING THE BEAMS
INSERT UNIT 
INTO BRACKET
PRE-ADJUSTING THE BEAMS
CONNECTING THE BEAM WIRES
CONNECT THE SAFETY BEAM
COMMON
WIRES TO 
BEAM TERMINALS (EITHER 
WIRE TO EITHER TERMINAL)
CONNECT PUSHBUTTON WIRES 
TO WALL STATION'S TERMINALS
MOUNT WALL STATION 
AT LEAST 5 FEET ABOVE 
THE FLOOR LEVEL
USE WOOD SCREWS 
WHEN MOUNTING 
DIRECTLY TO WALL 
PUT HOLE 
PLUGS IN 
TO HIDE 
SCREWS
 AND
ADJUST UNITS SO 
LENSES POINT TOWARD 
EACH OTHER
SPRING CLIP LACTHES 
INTO DETENT MARKS 
TO HOLD UNIT'S POSITION
 AND
USE MACHINE SCREWS 
WHEN MOUNTING TO 
A SINGLE-GANG BOX
WIRES TO THE 
WALL STATION
ASSEMBLE BRACKETS 
WITH 1/4-20 x 3/4" BOLTS 
AND KEPS NUTS
BRACKET 
INDEX 
MARKS
TWIST UNIT TO 
LOCK INTO BRACKET
WALL 
STATION 
WIRES
BEAM 
WIRES
9 Install the Door Bracket and Door Arm
SECTIONAL DOORS
1 Fully close the door. Hold the door bracket against the 
inside of the door’s top panel. Align the top edge of the 
bracket 2” to 4” below the top edge of the door; or, if 
there is a structural support across the top of the door, 
place the top edge of the bracket directly below the 
support. Align the vertical centerline drawn on the door 
with the center of the bracket. See the figure for details. 
Mark the left and right holes of the bracket.
2 Drill ¼” holes at marks and insert two ¼-20 x 2” 
carriage bolts (not supplied) from outside of door 
through the door bracket.
3 Secure door bracket with two ¼-20 keps nuts (not 
supplied). Tighten with a 7/16” socket.
4 Slide the 5/16” x 1-3/8” clevis pin through one hole on 
door bracket; then the single hole on the curved door 
arm; then through the other hole on the door bracket. 
Secure the clevis pin with the hitch pin.
5 Insert the single hole end of the straight door arm into 
the slot in the trolley. Slide the 1-1/8” clevis pin through 
the hole and secure it with a hitch pin.
6 Flip the trolley release lever to disconnect the trolley.
7 Rotate the curved door arm upward to meet the 
straight door arm connected to the trolley. Align the 
two door arms so that the holes in both arms overlap.
� NOTE: The straight door arm should be slightly angled 
toward the operator head. 
JAMB DOORS
1 With the door fully open, hold the door bracket on 
the vertical centerline drawn on top edge of the door. 
Use a pencil to mark the four mounting holes of the 
bracket.
2 Drill ¼” holes at marks and fasten the bracket with two 
5/16” x 2” lag screws to the top of the door.
3 Slide the 5/16” x 1-3/8” clevis pin through one hole on 
door bracket; then the single hole on the straight door 
arm; then through the other hole on the door bracket. 
Secure the clevis pin with the hitch pin.
4 Insert the single hole end of the curved door arm into 
the slot in the trolley. Slide the 1-1/8” clevis pin through 
the hole and secure it with a hitch pin.
5 Flip the trolley release lever to disconnect the trolley.
6 Rotate the straight door arm upward to meet the 
curved door arm connected to the trolley. Align the two 
door arms so that the holes in both arms overlap.
CONNECTING DOOR ARMS
1 Line up door arms until trolley is positioned as shown. 
Connect the arms together using two 5/16-18 x 1” bolts 
inserted in the highest and lowest matching holes, 
secure the bolts with two 5/16” keps nuts, tighten with 
a ½” socket.
INSTALLING THE DOOR BRACKET (SECTIONAL DOOR)
DRILL TWO 1/4" PILOT HOLES 
USE TWO 
NUTS (NOT SUPPLIED) TO ATTACH THE DOOR BRACKET
INSTALLING THE DOOR BRACKET (JAMB DOOR)
ALIGN CENTER OF 
DOOR BRACKET 
WITH CENTERLINE 
DRAWN ON DOOR
CONNECTING THE DOOR ARM TO THE DOOR BRACKET
SECTIONAL DOOR JAMB DOOR
CONNECTING THE DOOR ARM TO THE TROLLEY
CONNECTING THE DOOR ARMS
JAMB DOOR
10 Connect the Operator to Power Source
 WARNING 
To prevent electrocution or fire, installation 
and wiring must be in compliance with local 
electrical and building codes.
Cord and Outlet Connection
The operator should be connected to a grounded 
receptacle on the ceiling or near the operator head. If 
none is available which will accept the grounded operator 
plug, one should be installed by a qualified electrician. Do 
not use an extension cord. 
1 Plug the operator into a grounded receptacle.
2 When the operator is plugged in, a click should sound 
in the operator and the lights should turn on. If the 
lights do not turn on, check the power source and light 
bulbs.
Permanent Wiring
SOME LOCAL ELECTRICAL CODES REQUIRE 
PERMANENT WIRING BETWEEN THE OPERATOR 
AND THE POWER SOURCE THROUGH A CONDUIT. 
IT IS RECOMMENDED THAT YOU HAVE A LICENSED 
ELECTRICAL CONTRACTOR FOLLOW THESE STEPS 
ONLY IF PERMANENT WIRING IS REQUIRED.
1 BE SURE POWER CORD IS UNPLUGGED.
2 Cut the power cord about 2” above the strain relief 
bushing on the operator.
3 Remove the four side screws and bottom cover of 
operator.
4 Use pliers to remove the strain relief bushing and 
discard the bushing.
5 Remove the outer insulation from the power cord and 
strip the white, black, and green wire insulation back 
about ½”.
6 Pull white (neutral), black (hot) and green (ground) 
wires through conduit.
7 Connect the conduit to the operator with the 
appropriate termination.
8 Use wire nuts (not supplied) to connect the wires to the 
matching color wires inside operator head.
9 Secure the wires away from all moving parts with a 
zip-tie as shown in the figure.
10 Replace the operator cover and the four side screws.
11 Connect the conduit wires to the power source at 
junction box.
12 When power is applied to the operator, a click should 
sound and the lights should turn on. If the lights do 
not turn on, check the power source, wiring, and light 
bulbs.
To reduce the risk of electric shock, this 
operator has a grounding pin. This plug will 
only fit into a grounding type outlet. If the plug 
doesn’t fit into the outlet, contact a qualified 
electrician to install the proper outlet. Do not 
change the plug in any way.
POWERING THE OPERATOR
REMOVING THE POWER CORD
CUT THE CORD ABOUT 
2" ABOVE THE STRAIN 
RELIEF BUSHING
REMOVING THE BUSHING
HARDWIRING THE OPERATOR
CONNECT CONDUIT 
WIRING TO OPERATOR 
WIRING WITH 
WIRE NUTS
GREEN - GROUND 
WHITE - NEUTRAL 
BLACK - HOT
CAUTION! LIGHTWEIGHT SECTIONAL DOORS 
NOT DESIGNED FOR USE WITH A GARAGE 
DOOR OPENER MUST BE EQUIPPED WITH A 
DOOR REINFORCEMENT KIT (CHECK WITH 
THE GARAGE DOOR MANUFACTURER)
DOOR
STRUCTURAL
SUPPORT
BOLTS AND
CURVED
DOOR
ARM
CONNECT
SINGLE-HOLE
END OF
DOOR ARM
LINE UP DOOR ARMS UNTIL TROLLEY 
IS POSITIONED AS SHOWN
18"
CONNECT ARMS WITH 
TWO 5/16-18 x 1" BOLTS 
IN THE HIGHEST AND 
LOWEST MATCHING HOLES
INSTALL 
HITCH PIN
1-3/8"
CLEVIS
PIN
TROLLEY
DOOR
BRACKET
1/4-20 x 2" CARRIAGE 
APPROXIMATELY
 WARNING 
PLUG OPERATOR 
INTO GROUNDED 
OUTLET
FOR PERMANENT WIRING ONLY!
BE SURE THE POWER
CORD IS UNPLUGGED!!
FOR PERMANENT WIRING ONLY!
REMOVE STRAIN 
RELIEF BUSHING 
WITH PLIERS
FOR PERMANENT WIRING ONLY!
ALIGN THE DOOR BRACKET 
ON THE CENTERLINE 2" TO 4"
BELOW THE TOP EDGE
OF THE DOOR, OR DIRECTLY
BELOW ANY DOOR
STRUCTURAL SUPPORT
USE TWO 
5/16" X 2" 
LAG SCREWS 
TO FASTEN 
BRACKET TO 
DOOR
STRAIGHT
SLIDE IN THE 
1-1/8" CLEVIS PIN
INSTALL THE 
HITCH PIN
2" TO 4"
CONDUIT
DOOR 
ARM
4" TO 6"
SECTIONAL DOOR
CEILING 
OUTLET
WIRE 
NUTS
INSTALL 
HITCH PIN
1-3/8"
CLEVIS
PIN
STRAIGHT DOOR ARM (SECTIONAL) 
CURVED DOOR ARM (JAMB)

11 Aligning the Infrared Safety Beam
The safety beam has two components, a sender and a receiver. The sender produces a narrow infrared beam that 
travels across the bottom of the door opening to the infrared receiver. If an object blocks the infrared beam while the 
door is closing, the door will stop, then reverse and fully open (the operator’s light will flash three times).
As a safety feature, the operator will ignore signals from all remote controls if the door is open and the 
infrared safety beam is blocked or out of alignment. In this case, the door can be forced closed by pressing 
and holding the wall station’s up/down arrow pushbutton (be sure the door area is in clear view).
 WARNING 
With the door closed, disengage the trolley 
from the chain during these alignment tests by 
pulling the red release handle.
Safety Beam Test
Serious injury or death from a closing garage 
door may result because of failure to test and 
adjust safety reverse system. Repeat this test 
monthly and adjust as needed.
 WARNING 
1 Check that the operator has power. The green lights on 
the sender and receiver should be lit.
2 If the receiver’s green light is on, but the red light is off, 
SAFETY BEAM INDICATORS
the receiver has power but is not detecting the infrared 
beam from the sender. The red light might flash when 
the beam is partially detected. This can be caused by 
mis-alignment or something blocking the beam. Adjust 
the safety beam sender and receiver while watching the 
receiver’s red light (stay out of the beam while aligning 
it). When the red light stays on, the beam is aligned.
SAFETY BEAM INDICATOR TABLE
GREEN ON POWER ON
GREEN OFF POWER OFF
RED ON BEAM OK - NO BLOCKAGE
RED OFF BEAM BLOCKED OR MIS-ALIGNED
RED FLASHING BEAM ALIGNED POORLY
� NOTE: If the receiver’s red light remains off, check 
GREEN LIGHT
ON = POWER ON 
OFF = POWER OFF
RED LIGHT
ON = BEAM ALIGNED, NO OBSTRUCTION 
OFF = BEAM NOT ALIGNED, OR OBSTRUCTION 
BLINKING = BEAM NEEDS BETTER ALIGNMENT
ADJUSTING THE BEAM
ADJUST THE SENDER 
AND RECEIVER UNTIL 
THE RED INDICATOR 
LIGHTS SOLID
RED LIGHT
GREEN LIGHT
for: 1) Dirt on the receiver’s lens, 2) Sunlight shining 
into the receiver’s lens, 3) A short in the safety beam 
wiring (from staples or at the operator terminals).
3 With the door closed and the operator disengaged 
from the door, press the wall station’s UP/DOWN 
ARROW button to move the traveler (the part on the 
CHECKING FOR REVERSAL
belt or chain that the trolley engages with) to the up 
position (away from the door).
4 Push the wall station’s UP/DOWN ARROW button 
again. While the traveler is moving to the down 
position (toward the door), block the safety beam. THE 
TRAVELER MUST STOP, THEN REVERSE TO THE 
UP POSITION. The operator’s lights should flash three 
times.
5 Place an object in the path of the safety beam. Check 
that constant pressure is required on the wall station’s 
UP/DOWN ARROW button to cause the traveler 
to move toward the down position. Release the 
pushbutton before the operator stops; check that the 
traveler returns to the up position.
� NOTE: The garage door operator will not respond 
BLOCK THE BEAM 
WHILE THE TRAVELER 
IS MOVING DOWN
CHECKING FORCED CLOSURE FEATURE
THE TRAVELER MUST REVERSE 
WHEN THE BEAM IS INTERRUPTED
DOWN
UP
TOWARD 
DOOR
TRAVELER
VERIFY THAT CONSTANT 
PRESSURE IS REQUIRED 
ON THE WALL STATION'S 
PUSHBUTTON TO MAKE 
THE TRAVELER GO DOWN 
to a CLOSE command from a radio transmitter if the 
safety beam is blocked.
6 To reconnect the operator, flip the release lever 
up. Raise the door manually until the operator 
reconnects.
PLACE AN OBJECT 
IN THE BEAM'S PATH
RELEASE PUSHBUTTON 
BEFORE THE OPERATOR STOPS, 
THE TRAVELER SHOULD 
RETURN TO THE UP POSITION
12 Remote Controls
The operator is supplied with a three-button remote control (the second and third buttons can be used to control an 
additional operator or gate if it contains a Linear MegaCode™ receiver). Additional single and multi-button remote 
controls can be purchased. An unlimited number of remote controls can be used with this operator. The short white 
wire on the back of the operator serves as an antenna for the remote controls. Do not cut off the white wire or the 
remote controls will not operate well.
 WARNING 
Children operating or playing with a garage door 
operator can injure themselves or others. The 
garage door could cause serious injury or death. 
Do not allow children to operate the remote 
control(s) or the wall station. A moving garage 
door could injure or kill someone under it. Activate 
the operator only when the door is clearly visible, 
free of obstructions and adjusted properly.
To Add or Remove a Remote Control
1 Press the operator’s LEARN button. The red LEARN 
light will glow. The red light will stay on for about 15 
seconds. A remote must be added or removed while 
the red LEARN light is still on.
2 Send a signal from a remote. The opener’s light and 
the red light will flash once if a remote was added, or 
the opener’s light and the red light will flash four times 
if a remote was removed.
3 Repeat Steps 1 & 2 for any additional remote controls.
To Remove all Remote Controls
1 Press and hold the operator’s LEARN button for ten 
seconds or more. 
2 Release the LEARN button. The red LEARN light will 
blink three times signaling that all of the remotes 
in the operator’s memory were erased. The red 
LEARN light will turn off, then turn on for 15 seconds. 
A remote control can be entered during this time using 
Step 2 above.
Testing
1 Before testing the remote control, straighten out the 
operator’s white antenna wire so it points up.
2 Stand clear of the door, press the remote control’s 
button and verify that the operator starts. PRESS THE 
REMOTE CONTROL’S BUTTON AGAIN TO STOP 
THE DOOR MID-TRAVEL.
3 Set the open and close limits as described in the 
next section before any further testing.
Replacing a Remote Control’s Batteries
When the red light on the remote glows dimly, or fails 
to light at all when the remote is activated, the batteries 
need replacing.
1 Open the remote’s case and remove the circuit board
2 Replace old batteries with two Type 2032 batteries.
3 Re-assemble the remote.
PREPARING TO ADD A REMOTE
1
PRESS THE 
LEARN 
BUTTON
1
SEND A SIGNAL 
FROM A REMOTE
PRESS A
- OR -
BUTTON
REMOVING ALL REMOTES
REPLACING A REMOTE'S BATTERY
1
TWIST DIME IN 
SLOT TO OPEN 
CASE
3
CAREFULLY 
REMOVE THE 
CIRCUIT BOARD
4
REMOVE OLD 
BATTERIES AND 
DISPOSE OF THEM PROPERLY
ENTER A CODE 
AND PRESS 
START/STOP
2
LEARN LIGHT WILL GLOW FOR 
15 SECONDS, REMOTE MUST BE 
ENTERED WHILE LEARN LIGHT IS ON
2
THE OPENER’S LIGHT AND RED 
LIGHT WILL FLASH ONCE IF A 
REMOTE IS ADDED, OR THE 
OPENER’S LIGHT AND RED 
LIGHT WILL FLASH FOUR TIMES 
IF A REMOTE IS REMOVED
PRESS THE LEARN BUTTON
1
FOR 10 SECONDS OR MORE
2
THE LEARN LIGHT 
WILL BLINK 3 TIMES 
SIGNALING THAT 
ALL REMOTES WERE 
REMOVED
2
LIFT OFF 
THE TOP OF 
THE CASE
NOTE: 
THE CIRCUIT BOARD WILL FIT ONLY ONE 
WAY INTO THE CASE. ALIGN THE PLASTIC POST 
IN THE CASE WITH THE HOLE IN THE CIRCUIT BOARD
5
INSERT TWO NEW 
TYPE 2032 BATTERIES 
PLUS SIDE UP THEN 
REASSEMBLE UNIT
TOWARD 
OPERATOR
13 Adjusting the Open and Close Limits
The limit adjustments that control how far the door will 
open or close are located on the side of the operator. The 
limits should be adjusted so the door opens just short of 
any door stops, and closes right at the floor level. Each 
full turn of a limit adjustment equals about 2-½” of door 
travel.
CAUTION
Set the open and close limits carefully. Setting 
the limits beyond the distance that the door can 
travel could cause damage to the door, the door 
hardware, or operator.
1 If this is a jamb door installation, with the operator 
at mid-travel, turn the CLOSE LIMIT adjustment 
five turns in the UP direction before proceeding.
2 Activate the remote control. Wait while the door moves 
to the open position and stops.
3 Examine the position of the door.
 • If the door needs to open more, turn the OPEN LIMIT 
adjustment clockwise ¼-turn (towards UP on the label) 
to raise the open limit.
 • If the door needs to open less, turn the OPEN LIMIT 
adjustment counterclockwise ¼-turn (towards DOWN 
on the label) to lower the open limit.
� NOTE: On jamb doors, set the open limit so the door 
stops just short of level (see figure).
4 Activate the remote control. Wait for the door to move 
down a few feet, then activate the remote control again 
to stop the door.
5 Repeat Steps 2-4 until the open limit is properly 
adjusted.
6 Activate the remote control. Wait while the door moves 
to the closed position and stops.
7 Examine the position of the door.
 • If the door needs to close more, turn the CLOSE 
LIMIT adjustment counterclockwise ¼-turn (towards 
DOWN on the label) to lower the close limit.
 • If the door needs to close less, turn the CLOSE LIMIT 
adjustment clockwise ¼-turn (towards UP on the label) 
to raise the close limit.
8 Activate the remote control. Wait for the door to move 
up a few feet, then activate the remote control again to 
stop the door.
9 Repeat Steps 6-8 until the close limit is properly adjusted.
� NOTE: If the door stops during opening or reverses 
during closing before reaching the limits, the door force 
adjustment needs to be set. Change the adjustment as 
described in the next section then return to this section 
to finish setting the limits.
CHECKING WHERE THE DOOR STOPS
SETTING THE OPEN LIMIT ON A JAMB DOOR
JAMB DOOR
NOTE: SETTING THE OPEN LIMIT TOO HIGH WILL CAUSE 
THE OPERATOR TO "BUCK" WHEN STARTING DOWN
SETTING THE OPEN LIMIT
OPEN LIMIT
UP
DOWN
ADJUSTMENT
CHECKING WHERE THE DOOR STOPS
UP
DOWN
SETTING THE CLOSE LIMIT
UP
DOWN
CLOSE LIMIT
ADJUSTMENT
14 Testing & Adjusting the Door Force Safety System
The door force adjustments are located on the side of the 
operator. The door force adjustments must be properly  
set at all times. The CLOSE FORCE adjustment controls 
how much force is required to cause the door to reverse 
direction if an obstruction is encountered during closing. 
The OPEN FORCE adjustment controls how much 
force is required to stop the door if an obstruction is 
encountered during opening.
SETTING THE DOOR FORCE
ADJUSTING THE 
CLOSE FORCE
 WARNING 
Too much door force will interfere with the 
proper operation of the safety system. SOMEONE 
COULD BE SERIOUSLY INJURED OR KILLED IF THE 
DOOR FORCE IS SET TOO HIGH. A closing door 
UNDER-SETTING THE CLOSE FORCE
might not reverse properly when required and 
someone could be pinned under it. An opening 
door might not stop when going up and someone 
hanging on the door could get pinned between 
the door and the header. Do not increase the 
door force beyond what is required to move the 
door. DO NOT USE THE DOOR FORCE ADJUSTMENT 
TO COMPENSATE FOR A BINDING OR STICKING 
GARAGE DOOR. PERFORM THE SAFETY REVERSAL 
SYSTEM TEST (STEPS 4-6) MONTHLY!
� NOTE: Read the following directions carefully before 
setting the door force adjustments. 
SETTING THE CLOSE FORCE
 WARNING 
Always perform the Door Force Safety System Test 
after making any adjustments to the operator.
Door Force Safety System Test
1 Start with the door open. Use the remote control to 
cycle the door during these tests.
 Adjusting the Close Force
2 Turn the CLOSE FORCE adjustment 1/8-turn at a time 
in the DECREASE direction (counterclockwise) until the 
door stops and reverses mid travel while going down.
3 Turn the CLOSE FORCE adjustment 1/8-turn at a time 
in the INCREASE direction (clockwise) until the door 
fully closes without reversing.
 Safety Reversal System Test
4 Lay a 2 x 4 board flat on the floor where it will be struck 
by the center of the door as it closes.
5 Verify that the door reverses when it strikes the board. 
The door must reverse within two seconds after 
striking the board.
� NOTE: If the door stops after encountering the board 
and does not reverse, the CLOSE FORCE needs to be 
DECREASED.
6 Repeat the Safety Reversal System Test until the door 
reverses within two seconds of striking the board.
 Adjusting the Open Force
7 Turn the OPEN FORCE adjustment 1/8-turn at a time 
in the DECREASE direction (counterclockwise) until 
the door stops mid travel while going up.
8 Turn the OPEN FORCE adjustment 1/8-turn at a time 
in the INCREASE direction (clockwise) until the door 
fully opens without stopping.
TESTING THE SAFETY REVERSAL SYSTEM
UNDER-SETTING THE OPEN FORCE SETTING THE OPEN FORCE
DECREASE
DECREASE OPEN FORCE 
ADJUSTMENT UNTIL THE 
DOOR STOPS MIDWAY 
WHILE GOING UP
OPEN FORCE
DOWN
SET THE OPEN LIMIT SO THE DOOR 
STOPS JUST SHORT OF LEVEL
2 x 4 BOARD LAID FLAT 
UNDER 
UP
EXAMINE THE SPOT WHERE 
THE DOOR STOPS OPENING
USE A SCREWDRIVER TO 
ADJUST THE OPEN LIMIT
EXAMINE THE SPOT WHERE 
DOOR STOPS CLOSING
USE A SCREWDRIVER TO 
ADJUST THE CLOSE LIMIT
ADJUSTING THE 
OPEN FORCE
DECREASE CLOSE FORCE 
ADJUSTMENT UNTIL THE 
DOOR REVERSES MIDWAY 
WHILE GOING DOWN
DECREASE
CLOSE FORCE
INCREASE CLOSE FORCE 
ADJUSTMENT UNTIL THE 
DOOR CLOSES FULLY 
WITHOUT REVERSING
INCREASE
CLOSE FORCE
TEST WITH SMALL OBSTACLE
THE DOOR MUST REVERSE 
WITHIN 2-SECONDS AFTER 
IMPACT WITH A 2 x 4 BOARD
CENTER OF DOOR
INCREASE
INCREASE OPEN FORCE 
ADJUSTMENT UNTIL THE 
DOOR OPENS FULLY 
WITHOUT STOPPING
OPEN FORCE
15 Using the Garage Door Operator
IMPORTANT USER SAFETY INSTRUCTIONS
 WARNING 
A MOVING GARAGE DOOR CAN CAUSE INJURY OR DEATH! 
TO REDUCE THE RISK OF DEATH OR SEVERE INJURY:
1 READ AND FOLLOW ALL INSTALLATION INSTRUCTIONS.
2 NEVER LET CHILDREN OPERATE, OR PLAY WITH DOOR CONTROLS! KEEP REMOTE CONTROL 
AWAY FROM CHILDREN!
3 Always keep moving door in sight and away from people and objects until it is completely closed. 
NO ONE SHOULD CROSS THE PATH OF THE MOVING DOOR.
4 NEVER GO UNDER A STOPPED, PARTIALLY OPEN DOOR.
5 Test door operator monthly. The garage door MUST reverse on contact with a 1-1/2 inch object (or a 2x4 
board laid flat at the center of the door) on the floor. If adjusting either the force or the limit of travel, 
re-test the door operator. Failure to adjust the operator properly may cause severe injury or death.
6 If possible, use the red emergency release handle only when the door is closed. Use caution when 
using this release with the door open. Weak or broken springs may cause the door to fall rapidly, 
causing injury or death.
7 KEEP GARAGE DOORS PROPERLY BALANCED. (See Garage Door Operator Maintenance) An 
improperly balanced door could cause severe injury or death. Have a qualified service person make 
repairs to cables, spring assembly and other hardware.
8 
SAVE THESE INSTRUCTIONS.
Opening the Door
1 With the door in view, press the wall station’s UP/
DOWN ARROW button or the button assigned to the 
operator on the remote control, or enter a valid access 
code and press START/STOP on a remote keypad.
2 When the operator is activated, the operator’s lights 
will turn on and the door will begin to open.
3 The door will open until the open limit is reached. If 
an obstacle is encountered (operator’s lights flash four 
times) while the door is opening, the door will stop.
4 The operator’s lights will stay on for about five minutes 
after the door stops.
Closing the Door
1 With the door in view, press the wall station’s UP/
DOWN ARROW button or the button assigned to the 
operator on the remote control, or enter a valid access 
code and press START/STOP on a remote keypad.
2 When the operator is activated, the operator’s lights 
will turn on and the door will begin to close.
3 The door will close until the close limit is reached. If 
an obstacle is encountered (operator’s lights flash four 
times), or the safety beam is interrupted (operator’s 
lights flash three times) during closing, the door will 
stop, then re-open.
4 The operator’s lights will stay on for about five minutes 
after the door stops.
Stopping the Door Mid-travel
1 The door can be stopped immediately at any time 
by pressing the wall station’s UP/DOWN ARROW 
button, the remote control’s pushbutton, or press 
the START/STOP button on a remote keypad.
2 The next time the operator is activated, the door will 
move in the opposite direction.
Vacation Lock for Additional Security
1 Slide the wall station’s LOCK switch to the locked 
position to prevent remote controls from opening the 
door after the door is completely closed. The remotes 
can close the door, but not open it. The door can 
still be opened or closed by using the wall station’s 
UP/DOWN ARROW pushbutton.
� NOTE: To signal that the vacation switch is locked, 
the operator’s lights will flash five times if a remote is 
activated in an attempt to open the door.
2 Slide the wall station’s LOCK switch to the unlocked 
position to return the operator to normal operation.
Controlling the Operator’s Lights
1 The operator’s lights can be lit by pushing the wall 
station’s LIGHT button. The lights will remain on until 
the LIGHT button is pressed again or the operator is 
cycled.
2 If the operator’s lights are on, pushing the wall station’s 
LIGHT button will turn the operator’s lights off.
Disconnecting the Door from the Operator
1 With the door in any position (preferably closed), 
carefully pull the red release handle. USE CAUTION 
IF THE DOOR IS OPEN, THE DOOR MAY DROP.
2 The disconnected door can be opened or closed 
manually.
3 To re-connect the operator, flip the release lever up. 
Raise or lower the door manually until the operator 
reconnects.
OPENING OR CLOSING THE DOOR
WALL STATION REMOTE CONTROL
PRESS THE
WALL STATION'S
UP/DOWN ARROW
SAFETY LIGHTING
WHENEVER OPERATING, 
THE LIGHTS WILL TURN ON 
FOR ABOUT 5 MINUTES
STOPPING THE DOOR
PREVENTING REMOTES 
FROM OPENING THE DOOR
LOCK UNLOCK
CONTROLLING THE 
OPERATOR'S LIGHTS
PRESS THE LIGHT 
BUTTON TO TURN THE 
LIGHTS ON OR OFF
IN CASE OF POWER FAILURE 
OR IF DOOR BECOMES OBSTRUCTED
PULL THE RED 
RELEASE HANDLE 
TO DISCONNECT 
THE OPERATOR 
FROM THE 
DOOR
PRESS A REMOTE
- OR -
CONTROL BUTTON
THE DOOR CAN BE STOPPED 
AT ANY POSITION USING THE
WALL STATION, REMOTE CONTROL,
SLIDE THE VACATION SWITCH
DOWN TO LOCK (REMOTES DISABLED)
OR UP TO UNLOCK (REMOTES NORMAL)
THE LIGHTS WILL STAY ON UNTIL 
THE LIGHT BUTTON IS PRESSED 
OR THE OPERATOR IS CYCLED
FLIP THE LEVER UP 
AND RAISE OR
NOTICE
IF DOOR BECOMES OBSTRUCTED,
PULL DOWN ON HANDLE
LOWER THE DOOR 
TO RECONNECT 
THE OPERATOR
ENTER AN
ACCESS CODE
AND PRESS
- OR -
START/STOP
NOTE: FLASHING
LIGHTS INDICATE
TROUBLE
WALL 
STATION
REMOTE 
CONTROL
OR A REMOTE KEYPAD
NOTICE
IF DOOR BECOMES OBSTRUCTED,
PULL DOWN ON HANDLE
REMOTE 
KEYPAD
REMOTE 
KEYPAD
16 Garage Door Operator Maintenance
Weather conditions may affect the door operation which could require some re-setting of the operator’s adjustments. 
Doors may swell and become heavier during wet periods, door hinges and rollers might bind during cold periods. To 
insure safe operation of the door, perform the following tests, including any additional test steps described.
Every Month
1 With the door closed, pull the red release handle to 
disconnect the operator from the door.
2 From outside the garage, slowly open the door 
manually all the way, and then close it all the way. 
Notice if there is any binding, sticking or rubbing. The 
door should move smoothly in both directions.
3 Raise the garage door about halfway up. Carefully 
release the door and see if the door balances. It should 
Garage door hardware (springs, cables, 
brackets, pulleys, etc.) are under extreme 
pressure and tension. DO NOT ATTEMPT TO 
LOOSEN, TIGHTEN OR ADJUST ANY DOOR 
HARDWARE. CALL A QUALIFIED GARAGE DOOR 
INSTALLATION PROFESSIONAL!
 WARNING 
stay in place. Close the door.
� NOTE: If the garage door is unbalanced or the 
door travel isn’t smooth, have a qualified garage door 
professional adjust or repair the door.
4 To reconnect the operator, flip the release lever 
up. Raise the door manually until the operator 
reconnects.
5 Perform the Safety Beam Test (Section 11).
The garage door operator must not be 
installed and used on an unbalanced door. The 
operator’s internal door force sensor will not 
function properly on an unbalanced door. Risk 
of serious injury or death may result.
 WARNING 
6 Perform the Safety Reversal System Test as described 
in Steps 4-6 in Section 14.
TO DISCONNECT OPERATOR
TO RECONNECT OPERATOR
After Servicing the Operator
1 Perform the Safety Beam Test (Section 11).
2 Perform the Open and Close Limit Adjustments 
(Section 13).
3 Perform the entire Door Force Safety System Test 
(Section 14).
Every 6 Months
Check the belt or chain tension.
• For belt-drive rails, examine the length of the tension 
PULL THE RED 
RELEASE HANDLE 
TO DISCONNECT 
THE OPERATOR 
FROM THE 
DOOR
IF DOOR BECOMES OBSTRUCTED,
NOTICE
PULL DOWN ON HANDLE
FLIP THE LEVER UP 
AND RAISE OR 
LOWER THE DOOR 
TO RECONNECT 
THE OPERATOR
NOTICE
IF DOOR BECOMES OBSTRUCTED,
PULL DOWN ON HANDLE
spring in the traveler. It should be about 1” long.
• For chain-drive rails, examine the spacing between 
the turnbuckle and the rail. The turnbuckle should be 
slightly above the rail.
� NOTE: Too much or too little chain tension will cause 
excessive sprocket noise.
Chain Adjustment
If necessary, use the following steps to adjust the chain. 
1 Hold the turnbuckle with a flat blade screwdriver and 
loosen the two locknuts with a 7/16” end wrench.
2 Twist the turnbuckle to adjust the chain tension. Adjust 
the chain until the turnbuckle is sightly above the rail.
Always perform the entire Door Force Safety 
System Test (see Section 14) after making any 
adjustments to the operator.
ADJUSTING A CHAIN-DRIVE
TURNBUCKLE 
LOCKNUTS
LOCKNUTS
LOOSEN
 WARNING 
CHAIN
TIGHTEN
TWIST
TURNBUCKLE
CHAIN
LOOSEN
3 Hold the turnbuckle with a flat blade screwdriver and 
tighten the two locknuts with a 7/16” end wrench.
Belt Adjustment
The tension spring in the traveler keeps the belt taut. The 
TO HEAD
LOCKNUTS
TIGHTEN
HOLD TURNBUCKLE 
WITH FLAT BLADE 
SCREWDRIVER TO 
BACKUP LOCKNUTS
factory setting for the tension spring length is .9” long. If 
the tension spring is longer than 1”, adjust the belt. 
1 Hold the traveler so the adjustment wheel is visible 
through the large slot.
ADJUSTING A BELT-DRIVE
TRAVELER
ADJUSTMENT WHEEL
MEASURE THE TENSION 
SPRING LENGTH
2 Use a flat blade screwdriver to turn the adjustment 
wheel to compress the tension spring until its length is 
between .9” and 1” long.
Every Year
Check the door hardware for lubrication needs. Lubricate 
door hinges, rollers and bearings according to door 
manufacturer’s recommended procedures.
TURN THE ADJUSTMENT 
WHEEL UNTIL THE TENSION 
SPRING IS ABOUT 1" LONG
LOOSEN
TIGHTEN
17 Troubleshooting
LAMPS FLASH 
TROUBLE CODE
1 FLASH No problem
2 FLASHES Door won’t close Shorted wall station wires
3 FLASHES Door won’t close Safety beam obstacle
4 FLASHES
5 FLASHES
6 FLASHES
FCC NOTICE
Changes or modifications not expressly described in this manual or approved by the manufacturer could void the user’s authority to operate 
the equipment.
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. 
These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment 
generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause 
harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If 
this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and 
on, the user is encouraged to try to correct the interference by one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.
LIMITED WARRANTY
This Linear product is warranted to the original consumer against defects in material and workmanship for:
  MODEL  ELECTRONICS  MECHANICAL  MOTOR  BELT 
  LSO50  1 year  5 years  Lifetime  Lifetime
This product is warranted to the original consumer against defects in material and workmanship for the periods mentioned above. Linear will 
repair, or at its option, replace, any device that it finds requires service under this warranty, and will return the repaired or replaced device 
to the consumer at Linear’s cost. Devices must be sent to Linear for service at owner’s expense. This warranty does not apply to damage to 
the product from negligence, abuse, abnormal usage, misuse, accidents, normal wear or tear or due to failure to follow Seller’s instructions, 
or arising from improper installation, storage or maintenance. In no event will Linear be responsible for incidental, compensatory, punitive, 
consequential, indirect, special or other damages. The remedies provided by this warranty are exclusive. Some states do not allow the 
exclusion or limitation of incidental and consequential damages, so the above limitation or exclusion may not apply to you. Any warranties 
implied by law are limited to the time periods set forth above. Some states do not allow limitations on how long an implied warranty lasts, 
so the above limitation may not apply to you. This warranty gives you specific legal rights, and you may also have other rights which vary 
from state to state.
For warranty service and shipping instructions contact Linear at the phone number shown below. In order to be protected by this warranty, save 
your proof of purchase and send a copy with equipment should repair be required. All products returned for warranty service require a Return 
Product Authorization Number (RPA#). Contact Linear Technical Services at 1-800-421-1587 for an RPA# and other important details.
Copyright © 2010 Linear LLC  223711 B
PROBLEM CAUSE REMEDY
Remote control entered into 
memory
Add any additional remote controls 
(MegaCode™ type only)
Check wall station wires. Be sure both are 
connected to the terminal screws. Check for 
a staple in the wall station wires. Remove 
any staples compressing the wire.
Check for obstacles. Align the safety beam 
(Section 11)
Door reverses 
or won’t open or 
close
Door won’t open 
from transmitter
Motor ran longer 
than 30 seconds
Open or Close force exceeded, 
or motor thermal shutdown
Remote was activated while 
vacation switch was locked
Mechanical or electronic failure Call Technical Services Group for assistance
Check for binding or un-balanced door. 
Adjust the door force (Section 14). If motor 
had thermal shutdown, wait 30 minutes and 
retry.
Unlock vacation switch on wall station