LiftMaster, 41D794, motor kit, installation manual

Motor Kit
Model 41D794
Overview
This motor kit is for use with DC garage door openers that
utilize electronic controls to set the open (UP) and close
(DOWN) travel. The images are for reference and your product
may look different.
To prevent possible SERIOUS INJURY or DEATH:
• Disconnect ALL electric and battery power BEFORE
performing ANY service or maintenance.
Installation
The garage door MUST be in fully closed position during
installation.
1. Close the garage door.
2. Disconnect all electrical and battery power to the garage
door opener.
Square End
Spring Nut
3. Place an open-end wrench on the square end of the spring
nut, loosen nut to release the belt tension (Figure 1).
4. Remove light lens by gently pressing on the upper corners
of the lens to disengage tabs.
Trolley Threaded Shaft
5. Remove the 6 cover screws (Figure 2).
Open-ended Wrench
Figure 1
6. Remove the cover.
7. Remove the belt cap retainer on top of opener by removing
the three screws that secure it (Figure 3). Remove the belt
from the sprocket. Position the trolley at the center of the
rail.
Screws
Screws
Screw
8. Use screwdriver to remove C-clip from motor shaft. Then
slide the sprocket off motor shaft (Figure 3).
Screw
Lens Tab
9. Disconnect motor wire harness from logic board.
Disconnect travel module wire harness from travel module.
Lens
Figure 2
10. Remove the motor by loosening the three bolts and washers
on the top of the opener (Figure 3).
#8x3/8" Hex Screws
11. Reverse steps 4 through 10 to reassemble. When
reconnecting the wire harness, be sure the tabs on the wire
harness are facing the end panel, not the logic board
(Figure 4).
Belt Cap Retainer
C-Clip
Sprocket
Motor Retaining Bolts
12. Reset the belt tension by tightening the spring nut by hand.
Place an open-end wrench on the square end of the spring
nut and tighten clockwise until spring is compressed to
1-1/4" (3.18 cm). This sets the spring to optimum tension.
Belt may slip off sprocket if belt is too loose. If belt does
slip, reset belt and re-tighten spring nut by turning nut
clockwise an additional 1/2 turn. Do NOT over tighten belt
(Figure 5).
Figure 3
End
Panel
Wire Harness
13. Reconnect power to the garage door opener.
Proceed to Adjustment
Tabs
Logic Board
Trolley
For more information:
www.devancocanada.com
or call toll free at 855-931-3334
Nut Ring
1-1/4"
(3.18 cm)
1
Figure 4
Figure 5
Adjustment
Set the Force
WARNING
The force setting measures the amount of force required to
open and close the door.
1. Push the purple button twice to enter into the Force
Adjustment Mode. The LED will flash quickly.
2. Push the door control or programmed remote control. The
door will close (DOWN).
3. Push the door control or programmed remote control again.
The door will open (UP).
4. Push the door control or programmed remote control a third
time to close the door (DOWN).
The LED will stop flashing when the force has been
programmed.
The door must travel through a complete cycle, up and down, in
order for the force to be set properly. If the garage door opener
cannot open and close the door fully, inspect the door to ensure
that it is balanced properly and is not sticking or binding.
If the door is not stopping exactly where you would like it,
repeat Program the Travel Limits.
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.
• NEVER use force adjustments to compensate for a
binding or sticking garage door.
• 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 2x4 laid flat) on floor.
To prevent damage to vehicles, be sure fully open door
provides adequate clearance.
Program the Travel Limits
Travel limits regulate the points at which the door will stop
when moving up or down.
Adjust the position of the door by using the black and purple
buttons. Black moves the door UP (open) and purple moves the
door DOWN (close).
Setting the UP position:
1. Press and hold the black button until the LED starts flashing
slowly, then release.
2. Push and hold the black button until the door reaches the
desired UP (open) position.
NOTE: Make sure the door opens high enough for your vehicle.
3. Push the door control or programmed remote control.
This sets the UP (open) limit and begins closing the door.
4. Immediately when the door begins to close, press and
release either the black or purple button. This will stop
the door.
Setting the DOWN position:
5. Push and hold the purple button until the door reaches the
desired DOWN (closed) position.
6. Once the door is closed, if there appears to be too much
pressure on the door, you may toggle the door back and
forth using the black and purple buttons to reach the desired
closed position.
7. Push the door control or programmed remote control. This
sets the DOWN (close) limit and the door should open.
Proceed to Set the Force.
Test the Safety Reversal System
WARNING
Without a properly installed safety reversal system,
persons (particularly small children) could be SERIOUSLY
INJURED or KILLED by a closing garage door.
• Safety reversal system MUST be tested every month.
• After ANY adjustments are made, the safety reversal
system MUST be tested. Door MUST reverse on contact
with 1-1/2" high (3.8 cm) object (or 2x4 laid flat) on the
floor.
TEST
1. With the door fully open, place a 1-1/2" (3.8 cm) board (or a
2x4 laid flat) on the floor, centered under the garage door.
2. Operate the door in the down direction. The door must
reverse on striking the obstruction.
ADJUST
• If the door stops on the obstruction, it is not traveling far
enough in the down direction. Complete Adjustment Steps 1
and 2 Program the Travel Limits and Set the Force.
NOTE: On a sectional door, make sure limit adjustments do
not force the door arm beyond a straight up and down
position.
• Repeat the test.
• When the door reverses on the 1-1/2" (3.8 cm) board
(or 2x4 laid flat), remove the obstruction and run the opener
through 3 or 4 complete travel cycles to test adjustment.
• If the unit continues to fail the Safety Reverse Test, call for a
trained door systems technician.
2
HOW TO ORDER
REPAIR PARTS
DEVANCO CANADA
19192 HAY ROAD, UNIT Q
SUMMERSTOWN, ON K0C 2E0
TOLL FREE: 855-931-3334
www.devancocanada.com
WHEN ORDERING REPAIR PARTS
PLEASE SUPPLY THE
FOLLOWING INFORMATION:
3 PART NUMBER
3 DESCRIPTION
3 MODEL NUMBER
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