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ENTRANCE GATE INSTALLATION AND SETUP
DO NOT TIGHTEN THE MECHANISM MOUNTING HARDWARE MORE
THAN THE RECOMMENDED 105 FT-LBS OR DAMAGE TO THE CAST
SADDLES MAY OCCUR.
Install conduit into the junction box base. The S-80 housing is shorter than previous S-style
4.
gates (by 4 inches), so longer conduit may be required.
5.
Install the counterweight support arms. Remove the nuts and washers from each side of the
main shaft. Ensure the woodruff keys are in place and install the counterweight support arms
securing them with the six bolts. Install the main shaft nuts and washers but do not fully tighten
any hardware until after installing the conversion bracket.
Install the conversion bracket or gate saving device. Bolt to the counterweight support arms
6.
and now fully tighten the main shaft nuts and all of the remaining hardware,
7.
Ensure the gate conversion bracket is in the horizontal position so the gate arm can be
installed.
8.
Install the gate arm and gate arm lights per the manufacturer's recommendations. If the
gate arm weight is fully compressing the vertical buffer, it may be necessary to add a few
counterweights to relieve some of the pressure on the buffer so the horizontal position on the
gate arm can be properly adjusted. Refer to the following steps, 9 and 10. This is typically
needed when heavier gate saving devices are being used.
9. Install the counterweight stud plates. Be sure the roller spacers are over the studs and in
the arm support slot before mounting clamp bar and locking piece.
10. Install counterweights. Install the gate arm supports and counterweights with the gate arm in
the up position. The number of counterweights required is shown in Table 4-2. Weights are
based on the use of AREMA compliant gate arms and may vary slightly between different
manufacturer's gate arm types. Use of a gate saving device may change the number of
counterweights required.
11. Torque the gate arm per Section 4.2.2.
12. Adjust the horizontal buffer per the instructions below to ensure the arm is level and at
the proper vertical height above the roadway per railroad and/or MUTCD requirements.
Spring Buffer Adjustment: The S-80 Entrance gate mechanism is equipped with an external,
adjustable spring buffer for horizontal gate arm positioning. This is the upper buffer on the
mechanism's housing. The vertical (lower) buffer is a fixed synthetic bumper that does not
require field adjustment. The horizontal buffer controls the height of the gate arm above the
roadway. To adjust the horizontal position:
a) With the arm horizontal, remove the buffer cap from the top buffer.
b) Loosen the locking ring using Siemens Buffer Nut Wrench P/N NYK:070903-5 (pictured
below), and thread the buffer into the gate housing to raise the gate arm.
c) Adjust the buffer so that the gate arm is level (as close to zero degrees as possible) and
ensure the gate arm height above the crown of the roadway is adjusted in accordance
with railroad and/or local DOT standards.
d) Once the horizontal buffer is properly set, resecure the locking ring using the Buffer Nut
Wrench (shown below) and replace the buffer cap.
SIG-QG-21-01
Version: A
CAUTION
Figure 4-2 Buffer Nut Wrench
4-4
NOVEMBER 2021
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