Figure 4-4. Ajusting Flame Switch

Figure 4-3. Fuel Rgulator Valve Adjustment

TM-5-6115-545-12 Power Unit Utility Pack Gas Turbine Engine Driven (Air Research Model PPU85-5) Non-Winterized and (Air Research Model PPU85-4) Winterized Manual
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Figure 4-4. Figure 4-5. 4 - 1 2 . R e c e p t a c l e A s s e m b l y R e p l a c e m e n t . a. Removal. (1) Remove protective cover ( 7 5 , f i g . 4 - 1 ) . b. Fill a suitable container with antifreeze soliition and place thermometer in container. Place temperature sensing end of switch in Solutiom (2) Remove screws (76) and remove receptacle assembly (77) terminals from terminal board. (3) Remove screws (76) and remove recep- tacle assembly (77) from br~ket. Q. Installation. Install receptacle assembly ( 7 7 , f i g . 4 - 1 ) using removal steps of a, above in reverse order. 4 - 1 3 . I g n i t e r A s s e m b l y R e p l a c e m e n t . To replace igniter assembly, remove protective cover ( 7 5 , f i g . 4 - 1 ) and proceed as follows: ~. Disconnect power lead to igniter. ~. Remove igniter from heater using a 7/8 inch socket or spark plug wrench. c. Install igniter and reconnect power lead to ign~ter, 4 - 1 4 . W i r i n g H a r n e s s R e p l a c e m e n t . See f i g u r e 4 - 1 and proceed as follows: a. Removal, Tag and disconnect all electrical le~s and connectors from wiring harness ( 4 o r 1 1 , f i g . 4 - 1 ) to be removed. Remove all harness clamps and remove wiring harness, If 30% of the harness wires are defective, the harness must be rebuilt at next higher level of maintenance. b. Installation. Place wiring harness in position, ins~all all harness clamps, and reconnect electrical leads and connectors. Remove tags. 4 - 1 5 . T h e r m o s t a t S w i t c h T e s t i n g a n d R e p l a c e m e n t . “a. Disconnect and tag electrical connections and refiove switch as illustrated in f i g u r e 4 - 5 . Plug engine opening. c. Vary the temperature of the solution to det~rmine that switch opens at 155° * 3°F. and closes at 35 * 5°F. d. Replace defective switch. e. To install switch, see f i g u r e 4 - 5 . Connect ele~trical connections removed in step a. above. 4 - 1 6 . H o s e s , L i n e s , a n d F i t t i n g s R e p l a c e m e n t . See figure 4-1 and proceed as follows: ~. Removal. (1) Remove hose or line being replaced after closing cock (41, 45). (2) If fitting is to be replaced, remove fitting and plug opening until part is replaced. b. Installation. Install hose assembly using reriioval steps m reverse order. 4 - 1 0 C h a n g e 3

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