Figure 12-1. Speed Setting Adapter Plate

CHAPTER 12 MAINTENANCE OF ELECTRIC HYDRAULIC ACTUATOR

TM-5-6115-593-34 Generator Set Diesel Engine Driven Tactical Skid Mtd. 600 Kw 3 Phase 4 Wire 120/208 and 240/416 Volts Manual
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TM5-6115-593-34 NAVFAC P-8-631-34 TO-35C2-3-463-2 Figure 12-1. Speed Setting Adapter Plate with the shaft hole in the droop lever (33). (7) Close needle valve (92) 1/4 to 1/2 turn from bottoming to stabilize unit. (8) Check governor section for leaks, hunting, drifting and oil pressure. c. Governor Needle Valve Setting. Eliminate any air trapped in the actuator passages if not already done in the preliminary set-up. With the governor controlling, open needle valve (92) until the unit hunts or surges. After 2 or 3 minutes, gradually close the needle valve until the speed just settles out. Closing the needle valve further than necessary makes the unit slow to return to set speed after a load change. Never close the needle valve tight. Test the unit by manually disturbing the speed. Only a small overshoot or undershoot should occur before the unit returns to its steady-state speed. The actuator has no needle valve adjustment. d. Speed Droop Adjustment. Speed droop is adjustable internally. The speed droop bracket (32) is clamped to the speed droop lever with a setscrew. A pin on the droop bracket carries the floating lever (19). When this pin is aligned with the droop lever shaft the droop will be zero. Move the speed droop bracket towards the ballhead to increase droop. Speed droop is normally set in the range of 3 to 6 percent. e. Centering Pilot Valve Plunger. (1) Adjust speed adjusting screw until governor is approximately 5 percent above steady-state speed. (2) Disconnect test stand linkage from terminal shaft. (3) Back out actuator pilot valve plunger screw (63) 1-1/2 to 1-3/4 turns after bottoming very carefully against spring. Use a 7/64 inch (2.8mm) hex wrench. (4) Set test circuit (figure 12-2) to OFF and connect to transducer plug on actuator case. (5) Connect a 9 VDC power source to test circuit. Set test circuit to CENTER. (6) Adjust test circuit potentiometer to 400 ma then set switch to OFF. (7) Adjust spring seat screw (56) with a 1/8 inch (3.2 mm) hex wrench until terminal shaft rotates approximately to its midpoint of travel. Turn spring seat screw (56) clockwise to move terminal 12-2

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