4.20.
DESCRIPTION AND OPERATION OF LUBRICATION SYSTEM
The engine lubrication system consists of the main oil
pressure supply system and the oil scavenge system. The principal
components of the lubrication system are the oil filter assembly,
powerdriven rotary oil pump, powerdriven rotary boost pump, and
associated oil lines and internal passages. Figure 4.30 shows the
internal lubrication system for the T53L13. The operation of the
oil system is covered in the following subparagraphs.
a. Main oil pressure supply system. Engine lubricating oil
is supplied from an aircraftmounted oil tank. Oil enters the power
driven rotary oil pump, which is mounted on the N1 accessory drive
gearbox, along with the main oil filter, shown in figure 4.31A.
Filter oil is directed into two main flow paths. Oil is directed
through internal passages in the inlet housing to supply lubricating
oil to the front section of the engine, including the reduction
gearing, torquemeter, accessory drive gearing, the No. 1 main
bearing, and the power shaft forward bearing. The second oil path is
through the external oil pressure lines to the rear section of the
engine to lubricate the No. 2, 3, and 4 main bearings.
In the inlet housing section, oil is directed through the
accessory drive carrier flanges into the main oil transfer assembly
located in the rear support flange of the carrier, as illustrated in
figure 4.31(A). Oil from this passage is directed to the oil
transfer assembly for forcedfeed spray lubrication of the reduction
gears through three oil transfer tubes. Oil flows through internal
passages in the output reduction carrier liner, under pressure, to
three jets in the liner. One jet sprays oil forward, lubricating the
main output shaft bearing runner, the second lubricates the reduction
gear forward bearing, and the third sprays aft, lubricating the
output gear shaft bearing.
Oil from the transfer tube sprays against the output shaft
plug deflector. This deflector is manufactured with a predetermined
angle to splash the oil rearward, to lubricate the sun gear and power
shaft splines. Three oil jets located 120 degrees apart in the main
oiltransfer assembly, shown in figure 4.31(A), direct oil to the
rear planetary support bearings. The main oiltransfer support
assembly also houses an oil jet positioned so that high pressure oil
is directed to impinge or the power shaft bearing runner, thus
lubricating the bearing. Machined oil grooves in the accessory drive
carrier assembly, illustrated in figure 4.31A(B), transport oil
through an internal strainer to an oil nozzle located in the power
shaft support bearing retainer. The oil nozzle has three machined
jets. The first
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