318 Load Unit
88
Routine Maintenance Overview Checklist
Maintenance
A. Position the actuator at midstroke.
B. Set and enable the test controller’s upper and lower limit detect
interlocks to limit the actuator’s movement to 2 mm (0.10 in) in each
direction.
C. Move the crosshead so there is about 360 mm (14 in) between the top
of the actuator and the bottom of the force transducer.
D. Lock the crosshead.
Alignment takes place in a crush zone with hydraulic pressure on.
Hands can be crushed and equipment can be damaged equipment when
hydraulics are turned on. Be careful when working in a crush zone.
Observe the following to reduce the hazards in this procedure:
• Ensure that you set and enable displacement interlocks to limit the
actuator’s movement.
• Ensure that the crosshead is locked.
• Reduce the load unit’s hydraulic pressure to low.
• Keep your hands out of the crush zone except when performing the steps
needed to complete this procedure.
E. Turn the load unit’s hydraulic pressure to high.
F. If your load unit has an antirotate actuator, unscrew the four cap screws
that attach the antirotate plate to the bottom of the piston. The antirotate
plate is at the bottom of the actuator, inside the base of the load unit.
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