Hy-Security HTG 320-2 Installation And Maintenance Manual Download Page 17

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Installation and Maintenance Manual

HTG 320 Adjustments

The HTG 320 gate operator is pre-adjusted at the factory to perform correctly with the barrier arm
shipped. If the arm length, or weight is changed, it may be necessary to re-adjust the gate operator to
perform correctly. To properly adjust the HTG 320 gate operator, perform all adjustments in the
sequence listed.

Be certain to disconnect the power before performing any adjustments!

Arm Leveling:

This adjustment is accomplished with the threaded anchor at the base of the

hydraulic cylinder (see drawing HTC35 ST on page 10). The cylinder must be fully extended when the
arm is exactly level. By hand, physically pull the arm downward, until the maximum cylinder travel is
reached. If the anchor is set too low, the cylinder will run out of travel before the arm is fully level. If the
anchor is set too high, the arm will appear to sag since the cylinder is intended to act as an internal
physical stop. If adjustment is necessary, disconnect the cylinder from the anchor, by loosening the
Allen set screws on the lower clevis, then removing the lower clevis pin. Loosen the 1" lock nut and
screw the anchor as required. Adjust upward to lower arm, or down to raise the arm. Be certain to
firmly re-tighten set screws and the 1” locking nut.

Balance:

Before adjustments can be performed correctly, the operating weight of the arm must be

verified to be within the proper range for this machine. NOTE: All arms longer than 18' require
counterweight. If this is a new installation using a factory supplied arm, and no additional components
have been added, this test is not required because the factory has already provided the correct
counterweight for the arm as ordered. To determine the operating weight of the arm, first pull and twist
release the manual bypass valve (see drawing HTC35 ST on page 10), then manually lift the arm from
a position ten feet distant from the operator. The arm should appear to weigh forty pounds, or less,
regardless of the length or actual weight of the arm. If the operating weight of the arm is heavier than
our maximum specification, the operator is overloaded which adversely affects both automatic and
manual operation. The only remedy for an arm that is too heavy is to reduce the length of the arm, or
add additional counterweight.

Limit Switches:

For the arm to stop smoothly, when opening or closing, the limit switches must trip

approximately ten degrees before the arm achieves full travel. If adjustments are necessary, use an
Allen wrench to adjust the cam collars on the drive shaft (see drawing HTC35 ST on page 10).

Brake Valves:

When the limit switches are correctly set to trip a little early, the speed of the barrier

arm may decelerated to allow smooth stops.  The rate of deceleration is adjusted by the silver colored
brake valves, one for each direction of travel. The brake valve closest to the electric motor controls the
close direction (see drawing HTC35 ST on page 10). The brake valve on the left controls the open
direction. If adjustment of a brake valve is necessary, loosen the 9/16" lock nut and turn the adjuster
screw, in ¼ turn increments, with an Allen wrench.  The adjustment works opposite of typical, such that
a counter-clockwise will stop the arm more rapidly.  The correct brake valve adjustment will allow the
arm to smoothly stop just before the arm reaches full travel.   Tighten the 9/16" lock nut on the brake
valve when complete.

Note 1:

The brake valves do not control the closing of the arm when the manual bypass knob is pulled.

For adjustment of the manual mode, see step #3 on page 12.

Note 2

: Careful adjustment of the open limit switch and brake valve may be especially important in

installations where there is truck traffic and the gate operator is close to the edge of the road. Be aware
that the later the open limit switch trips when the gate is opening, the sooner the open circuit will be
able to accept a safety reverse when the arm is closing. The best adjustment requires a rapid, but
smooth, stop of the arm at the end of the open cycle.