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318 load unit: maintenance intervals, 318 load unit: maintenance intervals 77 – MTS 318 Load Unit User Manual

Page 77

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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

D

O

W

HEN

TO

D

O

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.