MTS Landmark System - Manual (Page 114)

Load Unit Maintenance Intervals
When to Do It What to Do
Before the start of each day’s testing. Make daily inspections
When the columns become greasy or dirty. Clean the load unit columns
Depends on the operating environment; more often
in humid environments. Prevent rust
When the load unit sits unevenly. Maintain airmount pressures
At least once a month. Perform label inspection
When the crosshead sticks or moves jerkily on the
column. Adjust the hydraulic locks
Whenever they begin to be hard to tighten or sticky
when loosened. Lubricate the crosshead locking bolts
When the bolts begin to loosen or tighten stiffly
(manual locking crossheads only).
After actuator or force transducer installation; when
a better alignment between the two is desired. Align the force transducer
At least once a month; more often as required by
operating conditions. Check the accumulators’ precharge pressures.
Adjust if necessary
Weekly; more often as required by operating
conditions. Clean exposed actuator piston rod
When the indicator is in bypass position or when
hydraulic fluid is changed. Change HSM filter
When servovalve performance has deteriorated. Perform 252 Servovalve maintenance: change filter
After the valve balancing procedure (electrical
compensation) has been completed and the results
are judged unsatisfactory. Perform 252 Servovalve maintenance: adjust
mechanical null
Calibration intervals depend on system requirements
and are typically performed during scheduled Perform sensor calibration
maintenance by MTS trained personnel. Sensors can
include LVDT, load cell, and extensometer.
114 | MTS Landmark Test System Operation
Maintenance