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3
2-1/4"
FIGURE 1
Shaft Support Bracket
with Bearing (Not Supplied)
Door Sprocket
2.75 for MGJ, butt together for LGJ
SITE PREPARATIONS
It is imperative that the wall or mounting surface provide
adequate support for the operator.
This surface must:
a) Be rigid to prevent play between operator and door
shaft.
b) Provide a level base.
c) Permit the operator to be fastened securely and with
the drive shaft parallel to the door shaft.
The safety and wear of the operator will be adversely
affected if any of the above requirements are not met.
For metal buildings, fasten 2” x 2” x 3/16” (or larger)
angle iron frames to the building purlins. For proper
spacing, retain .2.75” between for model MGJ, butt
purlins together for model LGJ. See Figure 1.
OPERATOR PREPARATION
IMPORTANT SAFETY NOTES
Model LGJ: Shipped from the factory for right hand mounting, refer to preparation instructions on page 4 for Left hand
mounting.
Model MGJ: Shipped from the factory for either left hand or right hand mounting. Refer to the last digit in the model
number for handing of your unit. If necessary, model MGJ may also be field modified to accommodate
opposite handing. Refer to the conversion instructions below and on page 4.
Disc Lever
Shaft
Bracket
Yok e
Keys
Spring
Disc Hub
Sprocket
E-Ring
MGJ OPPOSITE HANDING PREPARATIONS
1. Remove Disconnect Assembly Components
Remove the master link from the limit chain, remove the
chain and set it aside.
Remove the two E Rings securing the sprocket on the gear
reducer shaft. Remove the screws securing the yoke to the
disconnect shaft, set the yoke aside.
To prevent possible SERIOUS INJURY or DEATH:
• DO NOT connect electric power until instructed to do so.
• If the door lock needs to remain functional, install an interlock
switch.
• ALWAYS call a trained professional door serviceman if door
binds, sticks or is out of balance. An unbalanced door may not
reverse when required.
• NEVER try to loosen, move or adjust doors, door springs,
cables, pulleys, brackets or their hardware, ALL of which are
under EXTREME tension and can cause SERIOUS PERSONAL
INJURY.
• Disable ALL locks and remove ALL ropes connected to door
BEFORE installing and operating door operator to avoid
entanglement.
WARNING
CAUTION
WARNING
WARNING
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