Maintenance
MTS Landmark™ Tabletop Load Units - Product Information 103
Align the Force Transducer
Warning:
Alignment takes place in a crush zone.
The crosshead could drop suddenly, crushing hands and damaging load unit components.
Be sure you lock the crosshead, turn off electrical power, and use the clamp ring as described in
the following procedure.
1. Get things ready:
A. Be sure that the crosshead is locked.
B. If grips are installed, remove them.
C. Turn on system electrical power.
D. If necessary, reset any active interlocks at the test controller.
E. Loosen the clamp ring (located on one of the columns) and slide it down the column.
F. Turn on low hydraulic pressure; turn on high hydraulic pressure if low pressure is not
available.
G. Position the actuator at midstroke.
Caution:
Do not leave a crosshead unlocked.
It can drift slowly down when hydraulic pressure is turned off and damage any
test fixtures, grips, and specimen in its path.
Unlock the crosshead only to reposition it. Always lock the crosshead after you
have repositioned it.
2. Set the crosshead position.
Move the crosshead or actuator so that there is about 360 mm (14 in) between the bottom of
the actuator and the top of the force transducer. You need enough room to use a dial indicator.
l If you have hydraulic lifts, see the “Move the Crosshead Hydraulically” section to
position the crosshead.
l If you have manual lifts, see the “Position the Crosshead Manually” section to position
the crosshead.
Set and enable the test controller’s upper and lower limit detect interlocks to limit the actuator’s
movement to 2 mm (0.1 in) in each direction.
3. Check the alignment.
In this step, check the alignment between the force transducer and the actuator.
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