2 leveling the base and securing the girder chair, 3 re-leveling and securing the base – Rice Lake TSA Truck Scale Assembly User Manual
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2.32 Leveling the Base and Securing the Girder Chair
Leveling is the single most important part of the installation for achieving high-
accuracy weighing.
1.
Check to see whether the girder chair is centered longitudinally with the
scale deck I-beam, and adjust the mount if necessary. Place shims between
the top of the girder chair and the bottom of the scale deck I-beam, because
the scale deck I-beam is never even. The shims should cover the entire
surface to prevent bending.
2.
Using a high-quality bubble level, level the base stand within 0.2
°
of
horizontal to achieve a scale accuracy of 0.1% or better. The base stand
should be parallel with the girder chair, and the link plumb.
3.
Mark the girder chair hole locations on the scale deck I-beam (see
appendix).
Note:
The smaller capacity mount only has four girder chair bolts.
4.
Remove the load cell mount while noting the placement and height of the
shims.
5.
Use a cutting torch to drill the holes into the scale deck I-beam.
6.
Replace the mount and the shims. Bolt the girder chair to the scale deck I-
beam. The TSA will adjust slightly with the I-beam when the bolts are
loosely fitted. If needed, use jam nuts to lock the girder chair bolts in place.
Girder chair bolts are not supplied.
2.33 Re-leveling and Securing the Base
1.
Re-level the mount. If necessary, move the base stand around. A perfectly
level system will minimize side loads and bending moments.
2.
Remove the blocking for the particular mount, so that the platform and
scale deck I-beam are resting solely on the mount. Re-level the base stand
as necessary.
3.
Install all the other mounts in the system in the above manner before
bolting the base stands. After all the mounts are in place, remove all other
blocking, and remove the platform wedges making sure the platform is still
centered in the pit. If not, then re-wedge and adjust the mounts as
necessary. When you are sure that the platform is at the final height and has
the proper clearance, then proceed to anchor the base stands.
4.
Drill holes in the concrete foundation. Use concrete stud anchors or
equivalent to bolt the base to the foundation (see appendix). Make a final
check to see that everything is in place and level.