Load Unit: Maintenance Intervals - MTS Systems 318 Series Product Information

318 Load Unit: Maintenance Intervals

318 Load Unit
The following table lists the recommended interval for each of these procedures.
W D
HAT TO O
Make daily inspections
Clean the load unit columns
Prevent rust
Maintain airmount pressures
Bleed the hydraulic lift cylinders
Adjust the hydraulic locks
Lubricate the Crosshead
Locking Bolts
Lubricate the crosshead locking
bolts
Align the force transducer
Check the accumulators'
precharge pressures. Adjust if
necessary
Clean exposed actuator piston
rod
Change 298 HSM filter.
Perform 252 Servovalve
maintenance: change filter.
Perform 252 Servovalve
maintenance: adjust mechanical
null.
Routine Maintenance Overview Checklist
W D I
HEN TO O T
Before the start of each day's
testing.
When the columns become greasy
or dirty.
Depends on the operating
environment; more often in humid
environments.
When the load unit sits unevenly.
When the crosshead begins to
move roughly; if the sealed side of
the hydraulic supply is opened to
air.
When the crosshead sticks or
moves jerkily on the column.
Whenever they begin to be hard to
tighten or sticky when loosened.
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.
At least once a month; more often
as required by operating
conditions.
Weekly; more often as required by
operating conditions.
When indicator is in bypass
position or when hydraulic fluid is
changed.
When servovalve performance has
deteriorated.
After the valve balancing
procedure (electrical
compensation) has been completed
and the results are judged
unsatisfactory.
Maintenance 77