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driven by the aft transmission. The No. 1 flight control
hydraulic pump is mounted on and driven by the forward
transmission.
2-7-2. Transmission Lubrication Systems.
The forward, aft, and combining (mix) transmissions
have independent main and auxiliary lubrication systems
which operate concurrently. Each transmission has a
filter with an impending bypass indicator. If the differential
pressure across the filter exceeds 15 to 18 psi, the bypass
indicator will extend to indicate a partially clogged
filter. When the differential pressure reaches 25 to 30 psi,
lubrication oil will bypass the filter. Refer to table 2-15-1
for transmission oil system capacities, oil specifications,
and servicing procedures.
2-7-3. Forward Transmission.
The forward transmission lubricating system supplies
lubricating oil to the gears and bearings in the forward
transmission. Main system oil flows from the sump,
through the main oil pump, oil filter, cooler, and a jet
protection screen to jets from which the oil is discharged
to the various gears and bearings. Auxiliary system oil
flows from the auxiliary sump through the auxiliary oil
pump, and the auxiliary system filter to separate auxiliary
oil jets. An oil cooler mounted on the aft end of the transmission
around the input pinion cools mains system oil.
Air is forced through the cooler by a transmission-driven
fan.
2-7-4. Aft Transmission.
The aft transmission lubricating system supplies lubricating
oil to the various gears and bearings in the aft transmission
and to the aft rotor shaft bearing. In addition, the
main lubrication system circulates cooling oil through the
two AC generators on the aft transmission. Transmission
oil flows from the sump through the main lube pump,
main filter, cooler, and the jet protection screen to jets
where the oil is sprayed onto the various gears and bearings.
In addition, after the oil leaves the jet protection
screen, alternate paths routes some of the lubricating oil
to the aft shaft bearing and cooling oil to the generators.
Auxiliary system oil flows from the auxiliary sump through
through the auxiliary pump and filter to the various gears
and bearings. The auxiliary system does not lubricate the
aft shaft bearing or the generators. An oil cooler mounted
on the aft end of the transmission cools main system oil.
Cooling air is drawn through the cooler by a transmission-
driven fan.
2-7-5. Combining and Engine Transmission Lubrication
Systems.
The combining (mix) transmission contains the oil reservoirs
to supply lubrication oil to the various gears and
bearings in the combining (mix) transmission, No.1 engine
transmission, and the no. 2 engine transmission.
Two lubricating pump assemblies with four elements
each are within the combining (mix) transmission: leftpump
assemblies provides main lubrication to the combining
(mix) transmission and the no. 1 engine transmission.
The right pump assembly provides auxiliary
lubrication to the combining (mix) transmission and lubricates
the No. 2 engine transmission. Each pump assembly
contains two pumping elements and two scavenge
elements.
Combining transmission main lubrication oil flows from
the combining (mix) transmission oil reservoir through
the left pump assembly, filter, cooler, jet protection
screen, and to the jets which spray the oil onto the various
gears and bearings. One of the scavenge elements
of the left pump assembly returns the oil from the combining
(mix) transmission sump to the combining (mix)
transmission oil reservoir. The auxiliary lubrication oil
flows from the combining (mix) transmission auxiliary oil
reservoir to the right pump assembly, auxiliary lubrication
filter, and to the jets which spray the oil on the various
gears and bearings. One of the scavenge elements of the
right pump assembly returns the oil from the combining
(mix) transmission sump to the combining (mix) transmission
oil reservoir. the right pump assembly does not
route oil through a cooler.
No. 1 engine transmission oil flows from the No. 1 engine
transmission oil reservoir on the combining (mix) transmission
through the left pump assembly, filter, cooler, jet
protection screen, and to the jets which spray the oil on
to the various gears and bearings. One of the scavenge
elements of the left pump assembly returns the oil from
No. 1 engine transmission sump through a debris indicating
screen and back to the No. 1 engine transmission oil
reservoir. No. 2 engine transmission oil flows from the
TM 1-1520-240-10
2-7-2
No. 2 engine transmission oil reservoir on the combining
　
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