TM 9--2350--292--20--10005 00--13THEORY OF OPERATION -- CONTINUED0005 00AUXILIARY POWER UNIT (APU) -- CONTINUEDThe APU lubrication system includes a gear--type oil pump assembly (4) with oil intake cup (5), a bypass valve (6),an oil cooler (7) and an oil filter (8). Oil lines and passages distribute oil to the working parts of the auxiliary powerunit (1). A crankcase breather (9) is used to aid oil consumption control. The standpipe breather (10) vents crank-case fumes from the rocker arm cover (11) to the cylinder head intake port. Normal oil pressure should be 16 to 25psi (110.2 to 172.2 kPa) under normal operating conditions. A crankcase oil drain valve (12) with operating handle(13) is provided to drain the lubricating oil without removing the unit from the vehicle.113124871196105A constant speed governor is set to maintain engine speed at 2400 + 50 rpm at rated load. The governor uses aflyball (14) and cup mechanism (15) on the camshaft gear (16) as the sensing device. Any change in engine speedis transmitted from the yoke (17), through the governor shaft (18), arm and linkage (19) to the control lever (20) onthe injection pump (21). The speed may be adjusted by changing the spring tension, using the speed adjusting nut(22).161914151718222021
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