TM 55-2840-241-23 Change 19          5-13 CAUTION Do not attempt to open a clogged screen with a sharp instrument. (4) Clean  filter  assembly  parts  ultrasonically  if equipment is available. If equipment is not available, agi- tate parts in solvent (item 3, table  2-2). Dry parts using clean shop air regulated to approximately 15 psig. Air pressure should be applied to the exterior of the strainer. Repeat the procedure if visual inspection with a bright light shows that the interior of the strainer is not entirely free of contaminates. CAUTION Be sure strainer (8) is installed as shown in figure 5-8. Open end of strainer toward the outside of the control, away from the spring. Do not install backwards. (5) Install  strainer  (8),  spring  (9),  and  washer (10) in filter sleeve (5). Secure components in the filter sleeve with spring pin (6) and retaining clip (7). CAUTION Use extreme care to insure that the pneu- matic lines and fittings are not leaking. Er- roneous pressures will cause fuel control malfunction. (6) Lightly lubricate a new preformed packing (2) with  engine  fuel  and  place  it  on  plug  (1).  Install  filter assembly  (4),  spring  (3)  and  plug  (1)  in    fuel  control. Tighten the plug 65-70 in. lb and  lockwire (item 10, table 2-2). 5-13.  Power Turbine Governor.   a.  Removal.   NOTE Before replacing the power turbine governor to correct an engine malfunction, ensure that the pneumatic tubes and fittings are not leak- ing and the double check valve is functioning properly. A malfunction which appears to be a  governor  malfunction  may  be  caused  by erroneous pressures. (1) Remove the self-locking nut and remove the lever from the governor (10, figure 5-2). (2) Remove air tube (11) between the P_c filter (12) and governor tee. (3) Remove air tube (5) between the governor tee and fuel control. (4) Remove air tube (7) between the governor and fuel control. (5) Remove air hose (6) between the governor and accumulator (1). (6) Remove air tube (9) between the governor and control. (7) Remove  three  self-locking  nuts  (19,  figure 5-3) and washers (20) securing the governor to the gear- box. Remove the governor from the mounting studs. b.  Deleted.   c.  Installation. (1) Deleted. (2) Coat  the  governor  drive  shaft  splines  with lubricant (item 14, table  2-2) and the studs with  anti- seize compound (item 15, table  2-2) . Do not lubricate tube fittings. (3) Install  the  governor  on  the  mounting  pad studs. Make certain the governor drive splines are prop- erly engaged in the gearbox drive splines; the governor must be flush against the gearbox mounting pad. Secure the  governor  with  three  washers  (20,  figure  5-3)  and self-locking nuts (19). Tighten the nuts to 70-85 in. lb. (4) Install  air  tube  19,  figure  5-2)  between  the control and the governor. Tighten the coupling nuts to 80-120 in. lb. (5) Install air hose (6) between the governor and accumulator (1). Tighten the coupling nuts to 80-120 in. lb. (6) Install air tube (7) between the governor and control. Tighten the coupling nuts to 80-120 in. lb. Tighten elbow jam nut to 55-80 in. lb. (7) Install air tube (5) between the governor tee and the control. Tighten coupling nuts to 80-120 in. lb. Tighten the tee jam nut to 55-80 in. lb. (8) Install air tube (11) between P_c filter, (12) and governor tee. Tighten the coupling nuts to 80-120 in. lb. (9) Perform a fuel system pneumatic leak check. (Refer to paragraph 5-8.) (10)  Install  the  governor  lever  on  the  governor shaft and position approximately 90 degrees to the cent- erline of the indicator on the stop assembly. Secure the lever with the self-locking nut. Tighten the nut to 40-50 in. lb. (Overtorquing will cause binding of the lever shaft.)