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