Osco JG User Manual
Model JG
Industrial Gearhead Jackshaft
Door Operator
Safety, Installation, and
Service Manual
OSCO requires use of an electric edge or photoelectric control
for pedestrian protection on all automatic or
remotely controlled door operators.
OPERATOR SPECIALTY CO., INC.
P.O. BOX 128, CASNOVIA, MI 49318
032498
1-5-98
OSCO Model JG Instructions Page 2
Safety Information and Warnings
Read all of the following before beginning to install the
Model JG operator:
1. Read the green “SAFETY INSTRUCTIONS” sheet
provided with the operator information. It’s extremely important that the safety warnings and
precautions be understood and followed by the
installing contractor. Leave all instructions with
the end user.
2. Do not attempt to operate the machine unless it is
completely installed as instructed.
3. The installation must be made in a neat and
professional manner, observing all rules of good
workmanship and personal safety.
4. All electrical connections to the power supply must
be made by a qualified and licensed electrician.
All local and national codes must be observed.
5. A power-disconnect switch should be located
within sight of the operator so that primary power
can be turned off when necessary.
6. Do not remove the operator cover unless you are
qualified to service this equipment and the power
is turned off. There are no user-serviceable parts
inside.
Features
Mechanical
• Continuous-duty industrial C-face motor
• Heavy-duty right-angle gear reducer
• Dependable roller chain drive
• Magnetic disc brake standard
• Emergency disconnect for manual operation
• Chain hoist operation with precision machine-cut bevel
gears
• Easily field converted to any mounting position
Electrical
• Easily adjustable rotary limit switches
• Heavy-duty 3-button control station
• Industrial across-the-line magnetic starter
• 24V control circuit
• Electric disconnect when chain hoist is engaged
• Adapted for pull cord, radio control, or photoelectric control
• Adaptable for reversing door edge
• Available with adjustable plug-in timer to close
CAUTION
OSCO STRONGLY RECOMMENDS USE OF AN
ELECTRIC EDGE OR PHOTOELECTRIC CONTROL
FOR PEDESTRIAN PROTECTION ON ALL AUTOMATIC OR REMOTELY CONTROLLED DOOR OPERATORS.
7. Install enclosed warning signs so as to be visible
to all persons passing near or through the door.
Children should never be allowed to play on, near, or
around a motorized door. Any control devices should be
placed so as to be inaccessible to small children.
8. Operate the door only when it is in full view.
The door should never be operated unless it is in visual
9. Do not permit children to play on or around the
sight of the user.
door.
10. Never reach through or around a door frame to
Warning signs must be installed on or near the door.
operate the door controls.
A pushbutton or keyswitch should not be installed within
11. Install all recommended safety equipment.
reach of the door or operator.
LIMITED ONE-YEAR WARRANTY
This electric operator is warranted for a period of one (1) full year from date of installation against defects in materials or workmanship. Any part, parts, or complete unit which fails because of such defects within this period shall,
at the manufacturer’s option, be repaired or replaced at no charge. The manufacturers will not be responsible for
transportation and/or field service charges.
This warranty is in lieu of all other warranties, expressed or implied, and shall be considered void if visible evidence implies recommended installation procedures and maintenance instructions were not followed.
1-5-98
OSCO Model JG Instructions Page 3
General Product Information
The Model JG gearhead jackshaft operator will electrically operate service doors, rolling grilles, sectional vertical-lift
doors, and sectional high-lift doors (minimum 24" of high lift). The operator is equipped with a chain hoist mechanism for
manual door operation in case of power failure. The mechanism is pre-installed and will operate in the vertical mounting
position. The chain hoist assembly may be moved for right-hand or left-hand operation as desired. A disconnect cable is
supplied for engaging the chain hoist from the floor level. This pull cable also electrically disconnects the control circuit.
Speed reduction is achieved by means of a heavy-duty wormgear in oil bath gear reduction unit, prelubricated at the
factory. Output speed is 43 RPM. The motor may be removed from the gear reducer without affecting limit switch adjustment or chain hoist operation.
Limit switches are actuated by rotary motion of a shaft driving threaded limit nuts, fully adjustable over a wide range.
A standard operator is supplied with six feet of #40 roller chain, a 14-tooth drive sprocket, and a 24-, 36-, or 48-tooth
driven sprocket. Other driven sprockets are available.
The standard operator is wired for control by an OPEN–CLOSE–STOP pushbutton station with momentary contact on the
OPEN, CLOSE, and STOP buttons or can be controlled either open or closed by optional 24V three-wire radio, pull cord,
or single-button station.
The Model JG gearhead jackshaft operator can be
mounted in a variety of positions.
Pre-Installation and Inspection
Unpack the carton, checking for possible damage during shipment. Damage claims must be filed with the freight carrier.
The following parts (one each) are included in the carton:
Power Unit Shaft Collar for Door Shaft
Hand-Operating Chain Sprocket Key
Hoist-Engagement Cable (attached to power unit) #40 Roller Chain (6 feet)
Cable Retaining Bracket #40 Master Link
Drive Sprocket (14-tooth, attached to output shaft) 3-Button Control Station
Driven Sprocket (includes set screws), one of— Wiring Diagram (in controller enclosure)
24-tooth for sectional doors Installation Manual
36-tooth for vertical-lift doors Spreader Arm
48-tooth for rolling-curtain doors Shaft Collar for Operator
Chain Wheel Rope Clip
Chain Guide Assembly Vent Plug
Check to make sure that the available power supply to be connected to the operator is of the same voltage, phase,
frequency, and wattage as indicated on the operator nameplate.
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OSCO Model JG Instructions Page 4
Installation Instructions
Before installing the Model JG operator, read through the following steps and examine the drawings to help ensure a
satisfactory installation.
Operator Mounting—Right/Left Conversion
The Model JG operator may be mounted on either the right or left side of the door (see drawings below and on Page 3).
If it is necessary to move the chain hoist mechanism to the opposite hand, remove the shaft collar on the end of the
disconnect shaft, move the chain guide assembly and chain wheel to the opposite side, and replace the shaft collar.
Wall Mounting
The operator should generally be installed below the door
shaft and as close to the door as possible. The optimum
distance between the door shaft and the operator output
shaft is 12–15 inches. A greater distance can be allowed if
conditions prevent installation as prescribed:
1. Using the center line of the door shaft as a reference
point, locate four mounting holes as shown in the drawing
and chart at right and below.
2. For a secure installation, the operator should be mounted
using 1/2" through bolts. If the wall is of such construction
as to prohibit the use of through bolts, lag bolts and
shields of sufficient size may be used. At this point, bolts
should be hand-tightened only.
1-5-98
OSCO Model JG Instructions Page 5
Attachment of Spreader Arm and Door Sprocket
1. Remove the drive sprocket from the JG operator
drive shaft.
2. Slide the proper door shaft sprocket onto the door
shaft, with the key inserted into the keyway.
3. Slide the spreader arm assembly onto the door shaft.
4. Make necessary adjustments in the spreader arm so
the lower end will slide onto the operator drive shaft.
5. Slide the drive sprocket onto the drive shaft and
tighten the set screw securely.
6. Position the door sprocket to be exactly in line with
the drive sprocket. Tighten the set screw securely.
7. Slide the 1" shaft collar onto the door shaft. Tighten.
8. Connect the two sprockets with #40 drive chain. If the
chain supplied is too long, shorten it to the proper
length, using a chain tool or by driving out the
necessary rivets with a punch. Lock the chain with
the #40 master link. Adjust the chain so there is no
more than 1/4" of slack when the chain is depressed
between the sprockets.
9. Attach the wall retainer bracket onto the wall for
securing the disconnect cable.
IMPORTANT
1. Power supply must be of correct voltage and phase.
2. Always disconnect power from operator before servicing.
3. Keep clear of door during operation.
Wiring Instructions
Read the section titled “Limit Switch Adjustment” on Page 7 before starting the following steps.
1. Consult local electrical codes for permanent wiring requirements at your installation site.
2. Remove the cover from the controller enclosure. Refer to the wiring diagram supplied inside for all electrical connections described below.
3. Bring the power supply to the controller and connect wires according to the wiring diagram. On three-phase machines,
incorrect phasing of the power supply will cause the motor to rotate in the wrong direction (open when CLOSE button
is pressed and vice versa). To correct this, interchange any two of the incoming three-phase leads.
NOTE: This unit must be properly grounded. A green grounding wire is supplied for connection to the power supply
grounding lead.
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OSCO Model JG Instructions Page 6
Wiring Instructions (Cont’d)
4. Connect the three-button control station using four
wires, 14 GA or larger, to the terminal block in the
controller as shown in the upper illustration at right.
Connection of other types of control stations is shown
in the lower illustration.
5. The methods of installation for any passive auxiliary
control equipment, such as treadles or pull switches,
are at the discretion of the installer. Interconnections
between these devices and the operator should be to
the terminal block inside the controller. For electrical
connection points, refer to your wiring diagram.
Connection of an External Interlock Device
Circuitry is provided on all standard Model JG operators
for the connection of a two-wire external interlock device
that, when actuated, prevents the door from being
electrically operated. This should be wired into the
terminal block in the controller (see the upper diagram
at right, as well as the wiring diagram).
Nonstandard Wiring
If your operator is supplied with a nonstandard wiring type (see “Wiring Specifications,” on Page 13), for your particular
application refer to your wiring diagram for connection of all control equipment. If the wiring diagram is missing or has
been lost, call the factory for a replacement. Do not install any wiring or attempt to run this operator without consulting
the wiring diagram.
IMPORTANT NOTICE
This operator is supplied with a 3-button control
station (OPEN–CLOSE–STOP) accompanied by
the precautionary sign at right.
It is vital that the 3-button station be mounted
within sight but out of reach of the door and that
the warning sign be mounted adjacent to the 3button station.
The 3-button station must be connected so the STOP
circuit between terminals #2 & #4 is not bypassed.
Also, if additional 3-button stations are to be connected, the STOP buttons must be wired in series.
NOTE: A STOP button must be used when the instal-
lation has radio controls or a single button.
Desired Function Connecting Terminals
OPENING DEVICE #1 & #4
STOP #2 & #4
CLOSE #3 & #4
OPEN & CLOSE #4 & #5
SAFETY TO REVERSE #1 & #6
24V AC POWER #2 & #10
032498
1-5-98
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