Mts 318 Load Unit Manuel d'utilisateur télécharger pdf (Page 77)

Routine Maintenance Overview Checklist

318 Load Unit Maintenance

318 Load Unit: Maintenance Intervals

The following table lists the recommended interval for each of these procedures.

HAT TO DO WHEN TO DO IT

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.

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Mts 318 Load Unit Manuel d'utilisateur Page 77

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