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pressure and provides oil for charging the torque
(2) Neutral. In neutral, only the front oil
converter (b below).
pump is rotating. Oil is picked up from the sump
through the oil filter element and pumped into
(8) Trimmer valve. At the trimmer valve, main
main pressure circuit. Through various branches of
pressure enters the valve bore at two points. Oil
the main pressure circuit, oil is directed to the
passing into the bore at the lower end of the
trimmer valve flows also through the valve's orifice.
throttle regulator valve, manual selector valve, low-
This pressure is exerted against the bottom of the
intermediate shift valve, lockup valve, flow valve,
main regulator valve, and trimmer valve.
trimmer plug but, due to main pressure plus spring
pressure above the plug, cannot lift it. Oil entering
(3) Throttle regulator valve. At the throttle
regulator valve, main pressure is blocked because
the right side of the trimmer valve bore through an
the valve is downward (when engine throttle is
orifice cannot escape past the extender valve ball
because main pressure plus spring pressure holds
closed, throttle valve is against the stop). Opening
the ball seated. The trimmer is inactive during
the throttle will move the throttle valve upward
neutral operation but is set for operation and will
against a spring. The spring will push the throttle
regulator valve upward and allow oil to flow into
act when any shift (except lockup) manual or
the throttle valve (TV) circuit. Further movement
automatic occurs. Refer to paragraph 2-16i, for
will allow oil to flow into the throttle (T) circuit. T
trimmer operation.
and TV are regulated pressures which increase as
(9) Rear pump check valve. The rear pump
check valve ball is seated during neutral operation
the throttle is opened. Their effects will be ex-
plained in subsequent paragraphs.
(when vehicle is standing) because the rear pump is
not operating. Oil from the main pressure circuit
(4) Manual selector valve. At the manual
passes through an orifice between the front and rear
selector valve, main pressure fills the valve bore at
pump output lines and supplies oil, through a
the valve detent area. In neutral position of the
second orifice, to fill the rear governor pitot ring.
manual selector valve, main pressure flows only to
b. Converter-In Circuit (yellow--fig. 2-3).
the area above the low-intermediate shift plug. This
holds the low-intermediate shift plug downward
(1) The converter-in circuit is supplied from oil
escaping at the main regulator valve. The volume of
and the low-intermediate shift valve and blocker
this oil varies with engine speed (and vehicle speed
plug upward. This action is of no consequence
when vehicle is moving forward). Slight and / or
during neutral operation.
temporary changes in volume will be caused by
(5) Lockup valve. At the lockup valve, main
shifting, action of the throttle valve, lockup valve,
pressure is available for lockup but is blocked
trimmer valve, or inhibitor valves. However, in
because the valve is downward. The valve will
neutral, only the throttle valve can be actuated.
remain downward in neutral because no front
(2) Converter-in oil flows to three points.
governor (G1) pressure is available in neutral or
Trhese are an orifice to the converter-in line, the
reverse (c below).
(6) Flow valve. At the flow valve, main
lockup valve, and the converter-in regulator valve:
pressure enters the valve bore at three points. In
In neutral, or at any other time the lockup valve is
neutral, pressure at these three points is equal.
downward (converter operation), the orifice is
Pressure at the middle point is blocked. The lower
ineffective. It is ineffective because oil can flow
surface area of the valve is slightly greater than the
unrestricted to the converter-in line through the
upper surface area. As a result, the valve is held
lockup valve bore. The branch leading downward
upward against its stop. The action of the flow
to the converter-in regulator valve exhausts ex-
valve is dependent upon a significant flow of oil
cessive oil to the sump when the valve opens.
through the orifice at the left of the valve (para 2-
(3) The converter-in regulator valve opens
16a(1)). A branch of main pressure extends from
when the pressure in  the circuit exceeds a
the flow valve bore, when the flow valve is upward,
predetermined value. Input speed (and output
to the area between the extender valve and the
speed) and position of the lockup valve influences
extender valve ball above the trimmer.
its opening and degree of opening. It is shown in the
closed position in neutral because the engine is
(7) Main regulator valve. At the main
regulator valve, pressure acting against the lower
idling, only the front pump is supplying oil, and
surface area of the valve's large land raises the
there is unrestricted flow to the converter.
valve against spring pressure. This produces main
2-9

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