*TM 1-1500-204-23-5
3-4.20
Change 3
(2)
Oil Circulation. Oil is drawn from the sump,
through the screen to the inlet of the pressure pump. The
pump pressurizes the system and pumps the oil through
the filter and cooler and back to the transmission. Oil is
supplied through external piping to the aft rotary--wing
drive shaft (mast) thrust bearing. Drilled and cored pas-
sages in the transmission unit distribute oil to lubricators
and jets. The lubricators and jets spray oil into the trans-
mission bearings and onto the rotating gears. A scav-
enge pump in the fan drive housing is driven by the fan
drive shaft. The pump returns scavenged oil which col-
lects in the forward part of the transmission when the
aircraft is in a nose--down attitude.
m.
Drive Shafts. The purpose of drive shafting is to
transmit torque from the engines to the transmissions
and rotors. It also transmits torque to the fan assembly.
(1)
Engine Drive Shaft. There are two engine
drive shaft assemblies each tandem--rotor power train
system (Figure 3-3.Q). The purpose of the engine drive
shaft assembly is to transmit torque from each of the
engine transmissions to the combining transmission.
The shaft is a hollow, dynamically balanced tube. Each
shaft is connected to the combining transmission and
engine transmission by an adapter and plate assemblies,
one on each end of the shaft. The adapter and plate
assemblies provide flexibility in the shaft assembly.
1.
Bolt
2.
Adapter and Plate Assembly
3.
Special Washer
4.
Nut
5.
Shaft Assembly
6.
Bolt
7.
Adapter and Plate Assembly
8.
Retainer Nut
9.
Cotter Pin
Figure
3-3.Q. Engine Drive shaft Assembly.
