Owner's manual

Series 322 Load Unit Maintenance

Mixing different brands of hydraulic fluid can contaminate your system.

Contaminated hydraulic fluid can cause premature wear of the hydraulic

components in your system.

Do not mix different brands of hydraulic fluid. MTS Systems Corporation

recommends using Mobil DTE-25 or Shell Tellus 46 AW hydraulic fluid.

The filter element should be replaced whenever:

• The indicator on the top of the filter housing is in the bypass position, which

indicates a dirty filter condition.

• The hydraulic fluid in the hydraulic power unit is changed.

Replace the filter element with one of the same rating or better.

To change the filter element:

1. Ensure that system hydraulic pressure has been reduced to zero before

proceeding. To do this, turn off the hydraulic power unit and exercise the

actuator until it stops moving.

2. Turn off electrical power at the controller.

3. Place a waste fluid pan beneath the filter housing, which will accumulate

any small amount of drainage from the filter housing.

4. Remove the inlet filter bowl.

5. Remove the disposable filter element from the filter bowl.

6. Empty the oil in the filter bowl into the pan. Wipe out any remaining

sediment with a clean lint-free cloth.

7. Inspect the O-ring in the filter housing for any sign of deterioration. If

necessary, replace the defective O-ring (part number 010-010-726).

8. Lubricate the filter element and filter housing O-rings with clean hydraulic

fluid. Insert the replacement filter element into the filter bowl. Tighten the

filter bowl to 34–41 N·m (25–30 lbf·ft).

9. Apply low, then high, hydraulic pressure to the actuator manifold and

inspect the seal between the filter bowl and housing for any signs of

leakage. If leakage exists, turn off system hydraulic and electrical power and

repeat Steps 4 through 9.

ILTER PART NUMBER KIT NUMBER

3 micron (Beta

= 75) 011-395-937 044-205-301

10 micron (Beta

7.4

= 75) 011-395-936 044-205-201

CAUTION