Page 45 - Hydra-matic 6 Speed RWD Technician's Guide (October 2005)

HYDRAULIC CONTROL COMPONENTS

BALL CHECK VALVES LOCATION AND FUNCTION

#1 DRIVE 1-6/DRIVE BRAKING: #6 2-6 CLUTCH/1-2-3-4 CLUTCH FEED:
Located in the upper control valve body, this "ball shuttle valve" Located in the upper control valve body, this "one way orifice
style check ball allows drive braking fluid, in a Drive 1st gear control" style check ball is used to differentiate the flow rate of
engine braking condition, to enter the 2-6 clutch/1234 clutch feed fluid between applying and releasing the 1-2-3-4 clutch. 26 clutch/
fluid circuit to apply the 1-2-3-4 clutch. When the transmission is 1234 clutch feed fluid pressure opens the ball check valve
operating in Drive 1st, 2nd, 3rd, 4th, 5th or 6th gear ranges, drive while the transmission is operating in Drive 1st (engine brak-
1-6 fluid seats the ball check valve against the drive braking ing), 1st, 2nd, 3rd, 4th, 5th or 6th gear ranges. With the ball
passage and enters the 2-6 clutch/1234 clutch fluid feed circuit to check valve in this position, 26 clutch/1234 clutch feed fluid
apply the 1-2-3-4 clutch. flows freely into the 1234 clutch feed fluid passage. When
Park, Reverse or Neutral gear is selected after the transmis-
sion was operating in Drive, exhausting 1234 clutch feed fluid
#2 SOLENOID 1/REVERSE: seats the ball check valve and fluid is forced through orifice #32.
Located in the upper control valve body, this "ball shuttle valve" This allows for a controlled exhaust of 1234 clutch feed fluid.
style check ball is seated against the reverse fluid passage while
the transmission is operating in Park, Neutral and Drive 1st (En-
gine Braking). With the ball check valve in this position, solenoid #7 3-5 REVERSE SUPPLY/3-5 REVERSE FEED:
1 fluid enters the CSV2 enable fluid circuit to apply the clutch Located in the upper control valve body, this "one way orifice
select valve 2. When the transmission is operating in Reverse, the control" style check ball is used to differentiate the flow rate of
ball check valve seats against the solenoid 1 fluid passage to allow fluid between applying and releasing the 3-5 reverse clutch. 35
reverse fluid to enter the CSV2 enable fluid circuit and hold the reverse supply fluid pressure seats the ball check valve against the
clutch select valve 2 in the applied position. 35 reverse feed passage while the transmission is operating in
Reverse, Drive 1st, 2nd, 3rd, 4th, 5th or 6th gear ranges. With the
ball check valve in this position, 35 reverse supply fluid is forced
#3 SOLENOID 2/4-5-6 CLUTCH: through orifice #25 before entering the 35 reverse feed fluid pas-
Located in the upper control valve body, this "ball shuttle valve" sage. The orifice helps control the apply rate of the 3-5 clutch
style check ball is seated against the 456 clutch passage while the when the transmission shifts into Reverse, 3rd and 5th gears.
transmission is operating in Park, Reverse, Neutral, Drive 1st, 2nd When Park or Neutral gear is selected after the transmission was
and 3rd gear ranges. With the ball check valve in this position, operating in Drive, or Reverse, exhausting 35 reverse feed fluid
solenoid 2 fluid enters the CSV3 enable fluid circuit to apply the unseats the ball check valve. This allows for a faster exhaust of 35
clutch select valve 3. When the transmission is operating in Drive reverse feed fluid and a quick release of the 3-5 reverse clutch.
4th, 5th or 6th gear ranges, the ball check valve seats against the
solenoid 2 fluid passage to allow 456 clutch fluid to enter the
CSV3 enable fluid circuit and hold the clutch select valve 2 in the
applied position.

#4 PS5/4-5-6 CLUTCH:
Located in the upper control valve body, this "ball shuttle valve"
style check ball is seated against the 456 clutch passage by PS5
fluid while the transmission is operating in Drive 1st, 2nd and 3rd
gear ranges. With the ball check valve in this position, PS5 fluid
enters the CSV2 latch fluid circuit to hold the clutch select valve 2
in the released position. When the transmission is operating in
Drive 4th, 5th or 6th gear ranges, 456 clutch fluid pressure seats
the ball check valve against the PS5 fluid passage to allow 456
clutch fluid to enter the CSV2 latch fluid circuit to hold the clutch
select valve 2 in the released position.

#5 DRIVE 1-6/3-5 REVERSE SUPPLY:
Located in the upper control valve body, this "ball shuttle valve"
style check ball is seated against the Drive 1-6 fluid passage by 35
reverse feed fluid while the transmission is operating in Reverse.
With the ball check valve in this position, 35 reverse feed fluid
enters the 35 reverse supply circuit and is routed to the #7 ball
check valve. When the transmission is operating in Drive 1st,
2nd, 3rd, 4th, 5th or 6th gear ranges, Drive 1-6 clutch fluid pres-
sure seats the ball check valve against the 35 reverse feed passage
to allow Drive 1-6 clutch fluid to enter the 35 reverse supply fluid
circuit.

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