There is no power flow through the transmission in
Notice in figure 2-73 that there are two pumps--a
neutral. However, the oil pump is functioning to
front pump and a rear pump. The front pump operates
provide oil for the torque converter and, at the same
any time the engine is running and furnishes oil flow
time, developing a regulated line oil pressure to be used
and pressure for all of the hydraulic circuits except the
when other transmission ranges are selected. Figure
governor. The rear pump, driven by the output shaft,
2 - 7 3 s h ow s t h e n e u t r a l p o s i t i o n f o r a t y p i c a l
furnishes oil for the governor and assists the front
transmission.
pump, when necessary. Check valves are used to
PLANET CARRIER
DIRECT CLUTCH
REVERSE BAND
REVERSE RING GEAR
INPUT SHAFT
OUTPUT SHAFT
REVERSE SUN GEAR
REVERSE PLANET GEAR
KICKDOWN RING GEAR
KICKDOWN SUN GEAR
POWER FLOW IN NEUTRAL
KICKDOWN
REVERSE
(LOW)
SERVO
SERVO
CLUTCH
THROTTLE
VALVE
SHIFT
KICKDOWN
VALVE
CHAMBER
KICKDOWN
VALVE
LINKAGE
MANUAL
VALVE
LDNR
CONVERTER
T.C.
CONTROL
VALVE
SECONDARY
REACTION
AREA
COOLER
GOV.
VALVE
PRIMARY
REACTION
AREA
WEIGHT
REGULATOR
VENT
VALVE
OUTPUT
TO
SHAFT
LUB
REAR PUMP
FRONT PUMP
OIL FILTER
ASf02073
Figure 2-73.--Neutral (N) operating range.
2-56
