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8. At the test completion, switch the DIRECTION tog-
gle to the right towards the HOME light. Press the
stop button when Zero load is reached on the load
cell, channel 1 of the readout box.
8A. If Residual Shear values are needed, these can be
determined during this time.
9. Reduce the vertical load to Zero by adjusting the
Fairchild Pressure Regulator until Zero psi is
reached on the digital readout box.
10. The Shear Box can now be removed from the
water chamber and the sample can be inspected.
MAINTENANCE
Special care should be taken to see that the four roll-
er bearings between the water chamber and the base
slide track are properly cleaned and contain a slight
amount of oil during and after use. It is recommended
to cover the Direct Shear machine when not in use to
prevent dust buildup.
Empty the water chamber after each test to prevent soil
and sand buildup inside the chamber. The water can be
drained from the port, or the chamber can be removed
from the Direct Shear Machine for thorough cleaning.
ACCESSORIES
HMA-739 Shear Box Counterbalance
HMA-610 Direct/Residual Shear Data Acquisition
Software
4
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