Chamberlain GJ User manual

©
The Chamberlain Group, Inc.
A DUCHOSSOIS ENTERPRISE
845 Larch Avenue
Elmhurst, Illinois 60126
OWNER'S MANUAL
MODEL GJ
SOLID STATE
INDUSTRIAL DUTY
GEARHEAD JACKSHAFT OPERATOR
1
2
3
NEC CLASS 2 CIRCUIT
CONTROL
WIRING
CONNECT REVERSING EDGE
SWITCH - SEE INSTALLATION
INSTRUCTIONS
CAUTION
FOR INDOOR USE ONLY
INSTALL MORE THAN 8' ABOVE THE FLOOR
LOCATE CONTROL STATION SO THAT IS WITHIN
SIGHT OF PERSON OPERATING THE CONTROL. DOOR
MUST BE CONTROLLED BY 3 BUTTON STATION ONLY.
Lift-Master
The Professional Line
UL
169l LISTED
COMERCIAL DOOR OPENER
ASSEMBLED IN MEXICO
Model No.
Seial No.
Horsepower.
Voltage/Phase
Amperage
Rated Load
®
COMMERCIAL DOOR OPERATOR
LISTED
NOT FOR RESIDENTIAL USE
Serial #
(located on electrical box cover)
Installation Date
Wiring Type

2
MECHANICAL
DRIVE REDUCTION:.............40:1 Reduction
Heavy duty bronze worm
gear reducer
OUTPUT SHAFT SPEED:.....43 R.P.M.
DOOR SPEED:......................4 - 10" per sec.
depending on door
BRAKE: .................................Solenoid drum brake
HOIST WHEEL:.....................Standard mounting on
left or right side
SAFETY
DISCONNECT:.............Spring loaded floor level
disconnect arm
CLUTCH: (optional)....Adjustable torque limiter type
REVERSING EDGE:.....(Optional) Electric or pneumatic
sensing device attached to the bottom edge of door.
A REVERSING EDGE IS STRONGLY
RECOMMENDED FOR
ALL COMMERCIAL
OPERATOR INSTALLATIONS.
REQUIRED WHEN
THE 3 BUTTON CONTROL STATION IS OUT OF
SIGHT OF DOOR OR ANY OTHER CONTROL
(AUTOMATIC OR MANUAL) IS USED.
MOTOR
TYPE:.....................................Continuous duty
HORSEPOWER:....................1/2, 3/4 & 1 Hp
Single or Three phase
1-1/2 & 2 HP Three phase
SPEED:..................................1725 RPM
VOLTAGE:.............................115/208-230 Single phase
208-230 Three phase
CURRENT: ............................See motor nameplate
SPECIFICATIONS
ELECTRICAL
CONTROL VOLTAGE:.5V dc
AUXILIARY VOLTAGE: 24V dc
CONTROL STATION: ..3 Button
OPEN/CLOSE/STOP, NEMA 1
WIRING TYPE:.............B2 (Standard)
Momentary contact to OPEN/CLOSE/STOP plus wiring
for sensing device to reverse and auxiliary devices to
open and close with open override.
(Other types available. See chart, Pg. 14)
LIMIT ADJUST:............Linear driven, fully
adjustable screw type cams. Adjustable to 30 feet.
A
12 3/4"
8 3/4"
5 1/2"
7 3/8"
14 3/4"
B
4 3/4"
GJ OPERATOR
CLUTCH
1/2 HP
YES NO YES NO YES NO YES NO YES NO
DIMENSION A 28 9/16" 24 13/16" 28 11/16" 24 15/16" 28 15/16" 25 3/16" 29 1/16" 25 5/16" 29 11/16" 25 15/16"
DIMENSION B 14 5/16" 10 9/16" 14 7/16" 10 11/16" 14 11/16" 10 15/16" 14 13/16" 11 1/16" 15 7/16" 11 11/16"
3/4 HP 1 HP 1-1/2 HP 2 HP
WEIGHTS AND DIMENSIONS
HANGING WEIGHT:.........80-110 LBS.

3
INSTALL OPERATOR
FOR SECTIONAL AND ROLLING TYPE DOORS
CAUTION: AT LEAST 2 PERSONS AND A SAFE
WORKING PLATFORM ARE REQUIRED FOR
INSTALLATION.
Check the operator name plate mounted on the
electrical box to be sure the voltage, phase and h.p.
are correct for your needs.
1. Close door.
2. For metal buildings, fasten 2"x2"x3/16" (or larger)
angle iron frames to the building purlins. Retain
2-1/4" between frames. See Figure 1.
3. Place door sprocket and shaft support bracket
(sectional door only) on door shaft as shown.
Attach shaft support bracket to angle brace.
On concrete buildings, attach shaft support bracket
to wall of building.
NOTE 1: On concrete or block walls, install the
operator as shown in Figure 2.
NOTE 2: For standard rolling steel doors, install
operator as shown in Figure 3. (If mounting to a
steel building, make an angle iron mounting
frame as shown in Figure 1.)
6" FIGURE 1
Shaft Support Bracket
with Bearing
(Not Supplied)
Door Sprocket
FIGURE 3
Door
Sprocket
Mounting
Bracket
(Optional)
Drive
Sprocket
Direction of Output Shaft
Rotation for OPEN
FIGURE 2
Mount Door Sprocket to Door.
Sprocket Supplied with Door,
(Not with Operator).
Refer to Door Owner's Manual
for Installing Door Sprocket
Installation of Operator to
Sheet Type Rolling Doors 
or Rolling Doors without
Live Drive Shaft
TO AVOID DAMAGE TO DOOR AND OPERATOR,
MAKE ALL DOOR LOCKS INOPERATIVE. SECURE
LOCK(S) IN "OPEN" POSITION.
IF THE DOOR LOCK NEEDS TO REMAIN
FUNCTIONAL, INSTALL AN INTERLOCK SWITCH.
DO NOT CONNECT ELECTRIC POWER UNTIL
INSTRUCTED TO DO SO.
KEEP DOOR BALANCED. STICKING OR BINDING
DOORS MUST BE REPAIRED. DOORS, DOOR
SPRINGS, CABLES, PULLEYS, BRACKETS AND
THEIR HARDWARE MAY BE UNDER EXTREME
TENSION AND CAN CAUSE SERIOUS PERSONAL
INJURY. CALL A PROFESSIONAL DOOR
SERVICEMAN TO MOVE OR ADJUST DOOR
SPRINGS OR HARDWARE.
CAUTION WARNING

4
4. Place drive sprocket on the appropriate side of
the operator. Do not insert the key at this time.
5. Join roller chain ends together with master link.
6. Raise operator to approximate mounting position
and position chain over door and operator
sprockets.
7. Raise or lower operator until the chain is taut (not
tight). Make sure the operator output shaft is
parallel to door shaft and sprockets are aligned.
When in position, secure the operator to wall or
mounting bracket.
8. Hand chain wheel is factory installed. To change
position to opposite side of operator, remove E-
ring, chain guide, hand chain wheel and re-install
on operator in reverse order of disassembly.
Place hand chain around hand chain wheel. Be
sure to pass it through both openings in the chain
guide. Remove enough links so chain hangs
approximately two feet above the floor.
9. Uncoil emergency operating cable assembly and
mount the chain keeper bracket to the wall of the
building four feet above the floor, using two 1/4"
dia. bolts.
10. Insert cable assembly into bracket (Figure 6) and
remove slack from the cable by sliding spacer,
handle and set collar up the cable until spacer
touches underside of bracket. Temporarily tighten
set screw in set collar.
11. Remove cable assembly from bracket and slide
spacer, handle and set collar up the cable for a
distance of 3" +1/4". Permanently tighten set
screw in set collar and cut off excess cable about
1/4" from collar.
12. To engage the gears for manual hand chain
operation, pull down on handle and insert chain
keeper into bracket (Figure 6).
NOTE: To maintain proper cable tension during
manual operation, the cable assembly must be
pre-tensioned. Refer to steps 11 and 12 above.
FIGURE 4
Installation of Operator to
Standard Rolling Steel Doors.
Chain Keeper
FIGURE 6
Handle
Spacer
Set Collar
4 Ft.
Above Floor
Cable
NOTE: Vertical installations are standard, as
shown in Figures 2, 3 and 4.
For horizontal mounting applications, relocate the
cable sheave bracket (Figure 5) before proceeding
with the cable assembly installation.
Position of cable sheave bracket for
HORIZONTAL mounting of operator.

Position of cable 
sheave bracket for 
VERTICAL (standard) 
mounting of operator.
FIGURE 5
Relocate bracket using existing hardware.

5
INSTALL CONTROL STATION
WARNING
TO PREVENT ENTRAPMENT
DO NOT START DOOR DOWNWARD
UNLESS DOORWAY IS CLEAR
OPEN
CLOSE
STOP
Control Station
WARNING Notice
Push
Buttons
WARNING
DISCONNECT POWER AT THE FUSE BOX BEFORE
PROCEEDING.
OPERATOR MUST BE PROPERLY GROUNDED AND
CONNECTED IN ACCORDANCE WITH LOCAL
ELECTRICAL CODES. NOTE: THE OPERATOR
SHOULD BE ON A SEPARATE FUSED LINE OF
ADEQUATE CAPACITY.
ALL ELECTRICAL CONNECTIONS MUST BE MADE
BY A QUALIFIED INDIVIDUAL.
WARNING
TO AVOID DAMAGE TO DOOR AND OPERATOR,
MAKE ALL DOOR LOCKS INOPERATIVE. SECURE
LOCK(S) IN "OPEN" POSITION.
IF THE DOOR LOCK NEEDS TO REMAIN
FUNCTIONAL, INSTALL AN INTERLOCK SWITCH.
WARNING
INSTALL THE CONTROL STATION WHERE THE
DOOR IS VISIBLE, BUT AWAY FROM THE DOOR AND
ITS HARDWARE. IF CONTROL STATION CANNOT BE
INSTALLED WHERE DOOR IS VISIBLE, OR IF ANY
DEVICE OTHER THAN THE CONTROL STATION IS
USED TO ACTIVATE THE DOOR,
A REVERSING
EDGE MUST BE INSTALLED ON THE BOTTOM OF
THE DOOR.
FAILURE TO INSTALL A REVERSING
EDGE UNDER THESE CIRCUMSTANCES MAY
RESULT IN SERIOUS INJURY OR DEATH TO
PERSONS TRAPPED BENEATH THE DOOR.
Install the optional Reversing Edge before
proceeding with the Control Station installation.
OPTIONAL FEATURES AVAILABLE
REEL (OPTIONAL)
Take-up reel should be installed 12" above the top of
the door. COIL CORD (OPTIONAL)
Connect operator end of coil cord to junction box (not
supplied) fastened to the wall approximately halfway
up the door opening.
Electrician must hardwire the junction box to the
operator electrical box in accordance with local
codes.
FIGURE 7
Installation of Operator
to Sectional Door
(Metal Building)
Make-up Box
(Not Provided)
Take-up Reel
(Optional)
Coil Cord
(Optional)
Pneumatic Air Switch:
Not required or supplied
when electric sensing
edge is used
Air Hose
Reversing Edge
Wire (24V)
13. Complete electrical connections to the operator
and the control station. Fasten the control station
to the wall and MOUNT THE WARNING NOTICE
BESIDE OR BELOW THE PUSH BUTTONS.
14. Apply power to the operator. Press OPEN push
button and observe direction of output shaft
rotation. See Figure 3, page 3. Press the
STOP button.
If shaft does not rotate in the correct direction,
check for improper wiring at the control station or
between operator and control station.
If the operator is three phase and control station
wiring is correct, exchange any two of the three
incoming power leads.
If electrical problems persist, call our Toll Free
number for assistance (1-800-528-6563).
7/8" Hole for
CONTROL
(LOW Voltage) Wires
Hole for POWER
(HIGH Voltage) Wires
Sprocket
CONTROL
WIRING
Electrical
Box
CABLE CONNECTION NOTE:
Be sure to use the control box opening with the
1-1/16" hole for the POWER cable. All control wires
use the 7/8" hole.
Refer to Master Wiring Diagram. Make connection
through holes labeled for power and control. Do
not run control wires in the same conduit as
power wires.

6
ADJUST LIMITS
MAKE SURE THE LIMIT NUTS ARE POSITIONED BETWEEN THE LIMIT SWITCH ACTUATORS BEFORE
PROCEEDING WITH ADJUSTMENTS.
1. Depress open limit switch. The operator should stop.
2. To increase door travel, spin nut away from actuator. To decrease door travel, spin limit nut toward actuator.
3. Adjust open limit nut so that door will stop in open position with the bottom of the door even with top of door
opening.
4. Repeat Steps 1 and 2 for close cycle. Be sure close limit actuator is engaged as door fully seats at the floor.
If other problems persist, call our toll-free number for assistance - 1-800-528-6563.
CLOSEOPEN
Open Limit
Nut Close Limit
Nut Travel Nut
Retainer
Close Limit
Switch
Open Limit
Switch
OLS CLS
SLS
Actuator
Press Travel Nut Retainer Down
Toward Frame TO DISENGAGE.
TO AVOID SERIOUS PERSONAL INJURY OR DEATH
FROM ELECTROCUTION, DISCONNECT ELECTRIC
POWER BEFORE MANUALLY MOVING LIMIT NUTS.
WARNING

ADJUST CLUTCH (OPTIONAL)
7
Remove clutch cover and adjust clutch so that it is
tight enough to open and close the door but will slip
when the door meets an obstruction. Either loosen or
tighten the clutch nut with 1/4 turn increments. After
adjustment is completed, tighten locking set screw
and re-install clutch cover. Reconnect power to
operator and test for proper operation. The clutch will
require periodic inspection and adjustment.
Motor
Clutch
Adjusting
Nut
CONNECT REVERSING EDGE DEVICE (OPTIONAL)
The operator has been pre-wired to accept
connection of a reversing edge device. Connect the
normally open contacts to terminals T4 and T8 on the
low voltage terminal block. A cut-off switch will de-
activate the safety device during the last few inches
of the door's downward travel.
✳Use SAE 30 Oil (Never use grease or silicone spray).
✳✳ Use Mobil SHC75W90 all climate synthetic oil.
✔Repeat ALL procedures.
■ Do not lubricate motor. Motor bearings are rated for continuous operation
■Do not lubricate clutch.
■Inspect and service whenever a malfunction is observed or suspected.
■CAUTION: BEFORE SERVICING, ALWAYS DISCONNECT OPERATOR FROM POWER SUPPLY.
EVERY EVERY EVERY
ITEM PROCEDURE 3 MONTHS 6 MONTHS 12 MONTHS
Drive Chain Check for excessive slack.
Check & adjust as required.
Lubricate.* ●✔
Sprockets Check set screw tightness ●✔
Clutch (Optional) Check & adjust as required ●✔
Gear Reducer** Check for leaks and replace
seals as needed ●✔
Fasteners Check & tighten as required ●✔
Manual Disconnect Check & Operate ●✔
Bearings & Shafts Check for wear & lubricate ●✔
MAINTENANCE SCHEDULE
Check at the intervals listed in the following chart.
WARNING
IF CONTROL STATION CANNOT BE INSTALLED
WHERE DOOR IS VISIBLE, OR IF ANY DEVICE OTHER
THAN THE CONTROL STATION IS USED TO ACTIVATE
THE DOOR,
A REVERSING EDGE MUST BE INSTALLED
ON THE BOTTOM OF THE DOOR.
FAILURE TO INSTALL
A REVERSING EDGE UNDER THESE CIRCUMSTANCES
MAY RESULT IN SERIOUS PERSONAL INJURY OR
DEATH TO PERSONS TRAPPED BENEATH THE DOOR.
WARNING
TO AVOID SERIOUS PERSONAL INJURY OR DEATH
FROM ELECTROCUTION, DISCONNECT ELECTRIC
POWER TO OPERATOR BEFORE ADJUSTING SLIP
CLUTCH.
CAUTION: The torque limiter clutch is NOT an
automatic reversing device. An electric or
pneumatic reversing edge can be added to bottom
edge of door if desired.

Brake
Shoe
1-1/4"
(+ or - 1/32")
Cone
Shaped Stud
Set
Screw "A" Tighten Screw
to Adjust
Spring Compression
Spring
8
ADJUST THE BRAKE
Refer to illustration below. Tighten the screw until the spring compresses to the 1-1/4" dimension. Adjust screw
"A" until cone shaped stud just touches the two brake shoes as shown.
CAUTION: Do NOT over-adjust screw "A". If the cone shaped stud spreads the shoes, the brake will not
function correctly.
OUR LARGE SERVICE ORGANIZATION
SPANS AMERICA
INSTALLATION AND SERVICE INFORMATION
ARE AVAILABLE 6 DAYS A WEEK
CALL OUR TOLL FREE NUMBER – 1-800-528-6563
HOURS 7:00 TO 3:30 p.m. (Mountain Std. Time)
MONDAY Through SATURDAY
IN CANADA
CALL OUR TOLL FREE NUMBER – 1-800-654-4736
WHEN ORDERING REPAIR PARTS
PLEASE SUPPLY THE FOLLOWING INFORMATION:
PART NUMBER DESCRIPTION MODEL NUMBER
ADDRESS ORDER TO:
THE CHAMBERLAIN GROUP, INC.
Electronic Parts & Service Dept.
2301 N. Forbes Blvd., Suite 104
Tucson, AZ 85745
HOW TO ORDER REPAIR PARTS

9
MEMO:
NOTE:
This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to
Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful
interference when the equipment is operated in a commercial environment. This equipment generates, uses, and
can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may
cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to
cause harmful interference, in which case the user will be required to correct the interference at his own expense.

10
P1-
12345678910
P6- P7-
E21 E4
E3 E1
E2
TB1-
XMFR SECONDARY
E6 E7
1
1
15
4
ON OFF
234
U1
P2-
P3-
L3 L2
HL1
N
P4-
E9 E8
E12
E11
E13
E16
E19
E17
E15
E20
E18
E10
Q11 Q10
Q9 Q8 Q7
E14
OVERLOAD
PROTECTOR
LINE
LOAD
Orange
Blue
Black
Black Black
Blue
Blue
Internal Interlock
(when used)
Blue
Yellow
Yellow
Yellow
White White
TO
MECHANICAL
BRAKE
White OrangeOrange RedRedRed
Neutral115V
208-230V, 1Ø
Hot 115V
208-230V,1Ø
Black
Black
White*
Orange
Yellow
Black
Black
Black
Red
Black 115V
Orange 208-230V Orange 115V
Black 208-230V
Black
Black
White
TRANSFORMER
RADIO CONTROL
MOTOR
GND
OPEN
LIMIT
SWITCH
CLOSE
LIMIT
SWITCH
SENSING
LIMIT
SWITCH
NC
NO
NC
NO
NC
NO
C
C
C
Yellow
Blue
Blue
White
Yellow
Red
Red
Yellow
Blue
White
Blue
White
White
Yellow
White
White
White
White
Red
Red
3 2 1Brown
Gry./Wht.
Yellow
Open
Open / Close
Remove Jumper
to Install Interlock
Stop
Sensing Device
Close
Red
SOLID STATE SINGLE PHASE 
WIRING DIAGRAM
*THIS WIRE NOT USED 
WITH POWER INDUCTOR
POWER
INDUCTOR
