MOOG 79 Series (79-100) Servo Valves

wiring.

b. Loosen the jam nut using a 15/8open end wrench.

c. Adjust transducer case to achieve required transducer null voltage.

Caution:Limit adjustment to ±2 turns.Excess loosening of transducer

case will result in the release of hydraulic fluid.

d. Tighten jam nut.Replace transducer cover,being careful not to damage the

transducer wires,using two socket head capscrews with lockwashers.

Torque to 10 inch pounds.

Tools and Equipment

a. Metric Allen wrench set

b. Standard Allen wrench set

c. Open end wrench

6.GENERAL SERVICING RECOMMENDATIONS

a. Disconnect electrical lead to servovalve.

b. Relieve hydraulic system of residual pressure.

c. Remove servovalve.

8.FUNCTIONAL CHECKOUT AND CENTERING

a. Install servovalve on hydraulic system or test fixture,but do not connect

electrical lead.

b. Apply required system pressure to servovalve and visually examine for evi

dence of external leakage.If leakage is present and cannot be rectified by

replacing O-Rings,remove the discrepant component and return for

repair or replacement.

c. Connect electrical leads to servovalve and check phasing in accordance

with system requirements.

9.AUTHORIZED REPAIR FACILITIES

If servovalve continues to malfunction after all recommended corrective

action procedures are performed,defective valve should be returned to Moog

for repair.Moog does not authorize any facilities other than Moog or Moog

subsidiaries to repair its servovalves.It is recommended you contact Moog at

(716)655-3000 to locate your closest Moog repair facility.Repair by an

independent (unauthorized) repair house will result in voiding the Moog

warranty and could lead to performance degradation or safety problems.