STC SmartScanIS, User Manual

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14 January 2021, SmartScanIS User’s Guide for Union Pacific, EUD-2016026-00 Rev.2
10 At trackside, check all transducer-mounting bolts on all tracks to make sure that all
transducers are snug against the rail.
Four bolts are needed to hold the transducer in place. Two square-head bolts go
through the mounting plate and transducer body. Two hex-head bolts go through the
mounting plate and rail. If any of these bolts are sheared or missing, they must be
replaced with the correct replacement bolt. Also, if any washers or nuts are missing,
they must be replaced.
11 If all transducers aren't snug against the rail, fix this problem before proceeding.
Each installed transducer body should be 1-9/16 inches (3.97 centimeters) below the
top of the rail and parallel to it. Checking for these characteristics should be done with
the transducer height bracket on the bottom of the alignment fixture.
12 Place the alignment fixture across both rails, centered over each transducer in turn.
13 Check if each transducer body just touches the bracket.
The fixture should be snug against the top and gauge of both rails. This may be
impossible if the transducer body is less than 1-9/16 inches (3.97 centimeters) below
the top of the rail or if the transducer body is not parallel to the top of the rail.
14 If a transducer body doesn't just touch the bracket:
a Loosen the nuts holding the transducer body to its mounting plate.
b By sliding it up and down, adjust the transducer body to the proper height.
c Tighten each hex nut with a 9/16-inch torque wrench to a torque of 12 to
15 foot-pounds (16.3 to 20.3 newton-meters) .
Don't exceed a torque of 15 foot-pounds (20.3 newton-meters). Doing so can
weaken or break a bolt, requiring the bolt to be replaced.
d Wait until three more trains have passed over the site and then return to step 1 .
15 If a transducer body just touches the bracket, call STC for help in fixing the problem
that caused the values under "Axles," "T01," and "TO2" to be uneven.