Figure 3-37. Speed Switch

Figure 3-36. Alternator and Related Parts

Figure 3-38. Oil Level Gage and Adapter and Filler Elbow and Cap

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 3-37. (4) follows: Recommended Above 100° F . . . . voltage settings are as . . 26.2 Vdc O°Fto 1000 F..... 28. OVdc S e c t i o n X X I X . 3 - 1 8 5 . G e n e r a l . The speed switch is driven by the camshaft through a drive assembly and an angle adapter. The speed switch provides sequenced control of circuits during engine startup and protection against engine over- speed during’ operation. 3 - 1 8 6 . T e s t i n g a n d R e p l a c e m e n t . a. Testing. A complete test of the speed switch can–only be performed at a higher maintenance level. Organizational level testing is accomplished as fol- lows ( s e e f i g . 3 - 3 7 ) . (1) Remove connector (3) from the speed switch (5) and perform the continuity measurements as indi- cated in steps (2) and (3) with the engine off. If any continuity measurement is not verified, replace the speed switch. 0°Fto-650F . . . . . . ..30. OVdc (5) At completion of adjustment, discon- nect voltmeter and reconnect battery negative terminal. S P E E D S W I T C H (2) Short circuit between speed switch connec- tor pins A and B; G and H. (3) open circuit between speed switch connec- tor pins F and J, A and C, D and E. (4) Reconnect connector (3) to the speed switch (5). Q. Replacement. Replace speed switch ( 5 , f i g . 3 - 3 7 ) as follows: (1) Removal. (~) Remove cable connector (3). (Q) Loosen nut from adapter (2) and remove speed switch (5) from adapter (2). (2) Installation. Install speed switch (5) using removal steps in reverse order. C h a n g e 3 3 - 9 1

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