Gate Stops; Suspension System; Manual Operation - Chamberlain LiftMaster HS670 Owner's Manual

GATE STOPS

1. When properly installed the gate will open or close in
approximately 3" to 4" after limit shoe shuts the unit off, the
"gate stop" will contact the upper drive wheel stopping the
gate.
2. After operator has been installed and the limit shoes have been
attached to the top of the drive rail, locate and install the (2)
"gate stops" to the top of the drive rail.
NOTE: The 7" dimension is a reference. You may have to adjust
this slightly for your particular application.

SUSPENSION SYSTEM

1. The suspension system is semi-factory set; simply loosen the
suspension separator bolt completely. This will allow both
wheels to pinch the drive rail.
NOTE: It is suggested that the separator bolt be removed and left
with unit. If it is not removed, make sure that it can not interfere
with suspension system.
2. If more or less pressure is required, adjust both upper and
lower suspension spring lock nuts as desired. Both springs
should apply about the same amount of pressure.
IMPORTANT:
If using the LiftMaster drive rail, make sure that the drive rail
guide wheel is positioned properly.
It is very important that the suspension system is adjusted
properly. This system puts pressure on the drive wheels so they
can pinch together on the drive rail. This system also allows the
drive wheels to "float" so they can follow any slight misalignment
of the drive rail. If the springs are over tightened, it will reduce
their life span. But, on the other hand, if they are under tightened,
the drive wheels may slip on the drive rail.

MANUAL OPERATION

NOTE: When manually opening or closing the gate, it is not, in
the beginning, easy to get the gate started. Since fluid has
accumulated in the drive motors, it may take more force to get
the gate started.
The pump is equipped with a manual bypass valve. By positioning
the valve handle down (manual operation), the gate can be
manually opened or closed.
NOTE: A back-up to this is the suspension separator bolt. By
tightening this bolt, the drive wheels will be pushed off by the
drive rail.
I N S T A L L A T I O N
Lock Adjustment
Lower Nut
(Use 3/4" Wrench)
Bypass Valve Handle In
Automatic Position
11
Gate Stops
Limit
Shoe
Screw
Gate Stop
Lockwasher 11/16"
Hex Nut
Limit Shoe
Upper Drive
Wheel
Separator Bolt
(Use 9/16" Socket)
Guide Wheel
(provided on operator for use
with LiftMaster Drive Rail)
Rotate 90° (Down) For
Manual Operation
Limit
11/16"
Shoe
Upper Drive
Wheel
Drive
Rail
Guide
Wheel
Lower Drive
Wheel