LiftMaster MGJ LGJ Manual - Page 3

Important Safety, Operator Prep, Site Preparations, Operator, Preparation

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IMPORTANT SAFETY NOTES CAUTION WARWNAINRGNING W 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 CAUTION SPRINGS OR HARDWARE. 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. Shaft Support Bracket with Bearing (Not Supplied) Door Sprocket 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. 22.-715/4fo" r MGJ, butt together for LGJ FIGURE 1 OPERATOR PREPARATION 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. 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. KEYS SPRING DISC HUB SPROCKET E RING BRACKET YOKE SHAFT DISC LEVER 3

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3
2-1/4"
FIGURE 1
Shaft Support Bracket
with Bearing (Not Supplied)
Door Sprocket
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
CAUTION
WARNING
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
2.75 for MGJ, butt together for LGJ
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.
KEYS
SPRING
DISC
HUB
E RING
SPROCKET
YOKE
BRACKET
SHAFT
DISC
LEVER
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.