MAINTENANCE OF AIR CONTROL BOX DISCONNECT SWITCH OP3

MAINTENANCE OF FUEL QUANTITY TRANSMITTER MT4.

TM-9-6115-604-12 Generator Set Diesel Engine Driven Tactical Skid Rtd. 60 Kw 3 Phase 4 Wire 120/208 and 240/416 Volts Manual
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ARMY TM 9-6115-604-12 NAVY NAVFAC P-8-633-12 CAUTION Fuel which is to be reused must be kept free from contaminants. Drain fuel to be reused only into a container which has been thoroughly cleaned. (1) Open the fuel drain valve (34, Figure 4-31 ) and drain fuel into a suitable container. (2) Remove the control room fire extinguisher and bracket in accordance with paragraph 4-12. (3) Remove hexagon head cap screws (44), hexagonal nuts (45), and lock washers (46), and remove rear door stop plate (47). (4) Remove floor mat (53) Remove machine screws (48), and remove floor plates (49) from the skid base. (5) Remove electrical connector from fuel quantity transmitter MT4 (12, figure 3-16). (6) Remove screw and captive washer assemblies (11), and remove fuel quantity transmitter MT4 (12) and gasket (13) from fuel tank. Discard gasket (13). b. Test. (1) Set multimeter to RX1 scale. Connect one multimeter lead to connector terminal and the other multimeter lead to the fuel quantity transmitter body (ground). (2) With float at end of pivot mechanism point at full downward position (empty position) multimeter reading should be 0.000 to 0.50 ohms. Gradually raise the float at end of the pivot mechanism fully upwards to the “full” position and monitor resistance reading. Multimeter reading should increase smoothly from the minimum resistance (0 to 0.5 ohms) to 30.5 1 ohms maximum with the float at the full upwards (FULL) position. There should be no erratic jumps in resistance reading while float Is gradually being raised. (3) Replace fuel quantity transmitter MT4. If it falls testing as described above. c. Install. (1) Install replacement gasket (13, figure 3-16) and fuel quantity transmitter MT4 (12) in fuel tank using sealant compound MIL-S-7916. Secure with screw and captive washer assemblies (11). (2) Install electrical connector to fuel quantity transmitter MT4 (12). (3) Install floor plates (49, Figure 4-31) to the skid base with machine screws (48). Install floor mat (53). (4) Install rear door stop plate (47) with hexagon head cap screws (44), hexagonal nuts (45), and lock washers (46). (5) Install the control room fire extinguisher and bracket in accordance with paragraph 4-12. (6) Close fuel drain valve (34) and refill fuel tank. 4-32. MAINTENANCE OF AIR CONTROL BOX DISCONNECT SWITCH OP3 . Air control box disconnect switch OP3 senses engine lubricating oil pressure. When lubricating oil pressure rises above 40 psi (276 kPa), the normally open contacts close. The switch is used to disconnect air box solenoids L2A and L2B once the engine has stopped and oil pressure drops. a. Test. (1 ) See figure 3-3 Tag and disconnect wiring from air control box disconnect switch OP3. (2) Using a multimeter set to RX1 scale, check continuity across air control box disconnect switch OP3 contacts. (3) Multimeter should indicate infinite resistance. (4) See figure 2-13. Start the generator set and operate at rated speed. Ensure that LUBE OIL PRESSURE gage M1 indicates a minimum of 60 psi (414 kPa). (5) Multimeter should indicate zero resistance. 4-87

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