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Valve Body Unit 1. General: Chassis - A750E and A750F Automatic Transmissions CH-46

The document summarizes the valve body unit and solenoid valves used in A750E and A750F automatic transmissions. The valve body unit consists of upper and lower valve bodies and 7 solenoid valves that control shift changes and engage various clutches and brakes. Solenoid valves S1, S2, and SR are 3-way or 2-way valves that switch shift valves and the clutch apply control valve. Solenoid valves SL1, SL2, SLT, and SLU are proportional control valves that linearly control line pressure and clutch/brake engagement pressure based on ECM signals.

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Maxi Sardi
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1K views4 pages

Valve Body Unit 1. General: Chassis - A750E and A750F Automatic Transmissions CH-46

The document summarizes the valve body unit and solenoid valves used in A750E and A750F automatic transmissions. The valve body unit consists of upper and lower valve bodies and 7 solenoid valves that control shift changes and engage various clutches and brakes. Solenoid valves S1, S2, and SR are 3-way or 2-way valves that switch shift valves and the clutch apply control valve. Solenoid valves SL1, SL2, SLT, and SLU are proportional control valves that linearly control line pressure and clutch/brake engagement pressure based on ECM signals.

Uploaded by

Maxi Sardi
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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CH-46 CHASSIS — A750E AND A750F AUTOMATIC TRANSMISSIONS

JVALVE BODY UNIT


1. General
The valve body unit consists of the upper (No. 1 and No. 2) and lower valve bodies and 7 solenoid valves.

Solenoid Valve SLU


Solenoid Valve SR

Solenoid Valve SL2

No. 2 Upper Valve Body


Lower Valve Body
No. 1 Upper Valve Body

Solenoid Valve S2
Solenoid Valve S1

Solenoid Valve SL1


Solenoid Valve SLT
229LC161

" No. 1 Upper Valve Body A

Solenoid Modulator Valve

Clutch Lock Valve 3 - 4 Shift Valve


2 - 3 Shift Valve
B1 Accumulator 1 - 2 Shift Valve

B1 Apply
Control Valve

Secondary
Regulator Valve

229LC162

Lock-up Relay Valve Brake Control Valve


Lock-up Control Valve C3 Check Valve

NM
00M4E
CHASSIS — A750E AND A750F AUTOMATIC TRANSMISSIONS CH-47

" No. 2 Upper Valve Body A

Coast Brake Relay Valve

229LC163
CH

" Lower Valve Body A

Primary Regulator Valve

Clutch Apply Control Valve Sequence Valve

229LC164

SLT Damper Clutch Control Valve Accumulator Control Valve

NM
00M4E
CH-48 CHASSIS — A750E AND A750F AUTOMATIC TRANSMISSIONS

2. Solenoid Valve

Solenoid Valves S1, S2 and SR

D Solenoid valve S1 and solenoid valve SR use a 3-way solenoid valve.


D Solenoid valve S2 uses a 2-way solenoid valve.
D A filter is used at the tip of the solenoid valve to further improve operational reliability.

Filter
Drain

Line Pressure

Control Pressure Control Pressure

Solenoid Valve S1 OFF Solenoid Valve S1 ON


229LC165

Control Pressure

Filter
Line Pressure

Solenoid Valve S2 OFF Solenoid Valve S2 ON


229LC166

" Function of Solenoid Valves S1, S2 and SR A

Solenoid Valve Type Function


S1 3-way Switches the 2 - 3 shift valve
· Switches the 1 - 2 shift valve
S2 2-way
· Switches the 3 - 4 shift valve
SR 3-way Switches the clutch apply control valve

NM
00M4E
CHASSIS — A750E AND A750F AUTOMATIC TRANSMISSIONS CH-49

Solenoid Valves SL1, SL2, SLT and SLU

D In order to provide a hydraulic pressure that is proportional to the current that flows to the solenoid coil,
the solenoid valves SL1, SL2, SLT, and SLU linearly control the line pressure and clutch and brake
engagement pressure based on the signals they receive from the ECM.
D The solenoid valves SL1, SL2, SLT, and SLU have the same basic structure.

Sleeve Solenoid Coil

Spool Valve

Solenoid Valve SLT


CH

Hydraulic Hydraulic
Pressure Pressure

Current Current
229LC181

Solenoid Valves SL1, SL2 and SLT Solenoid Valve SLU

" Function of Solenoid Valves SL1, SL2, SLT and SLU A

Solenoid Valve Function


· C1 clutch pressure control
SL1
· Accumulator back pressure control
SL2 B1, B2 and B4 brake pressure control
· Line pressure control
SLT
· Accumulator back pressure control
· Lock-up clutch pressure control
SLU
· Accumulator back pressure control

NM
00M4E

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