Dodge Sprinter. Manual — part 286
Torque Converter Lockup Clutch Regulating Valve
The torque converter lockup clutch regulating
valve (6) (Fig. 113) regulates the torque converter
lock-up clutch working pressure (p-TCC) in relation
to the torque converter clutch control pressure (p-S/
TCC). According to the size of the working pressure
(p-A), the torque converter lockup clutch is either
Engaged, Disengaged, or Slipping. When the regulat-
ing valve (6) is in the lower position, lubricating oil
flows through the torque converter and oil cooler (8)
into the transmission (torque converter lockup clutch
unpressurized). In its regulating position (slipping,
torque
converter
lockup
clutch
pressurized),
a
reduced volume of lubricating oil flows through the
annular passage (7) bypassing the torque converter
and passing direct through the oil cooler into the
transmission. The rest of the lubricating oil is
directed via the throttle “a” into the torque converter
in order to cool the torque converter lockup clutch.
Fig. 113 Torque Converter Lockup Clutch Regulating Valve
1 - TORQUE CONVERTER LOCK-UP CLUTCH
2 - TORQUE CONVERTER OUTPUT
3 - TORQUE CONVERTER INPUT
4 - LUBRICATION
5 - TORQUE CONVERTER LOCK-UP SOLENOID
6 - TORQUE CONVERTER LOCK-UP CLUTCH REGULATING
VALVE
7 - OIL COOLER
8 - LINE PRESSURE REGULATING VALVE
9 - OIL PUMP
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AUTOMATIC TRANSMISSION NAG1 - SERVICE INFORMATION
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Overlap Regulating Valve
During the shift phase the pressure (Fig. 114) in
the deactivating shift actuator is regulated in rela-
tion to the engine load (modulating pressure, p-Mod)
and the pressure in the activating actuator. The reg-
ulated pressure is inversely proportional to the trans-
fer capacity of the activating shift actuator (regulated
overlap).
Fig. 114 Overlap Regulating Valve
1 - OVERLAP REGULATING VALVE
2 - ANNULAR SURFACE ON OVERLAP REGULATING VALVE
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AUTOMATIC TRANSMISSION NAG1 - SERVICE INFORMATION
21 - 115
Command Valve
When the end face is unpressurized (stationary
phase), the working pressure (p-A) is directed to the
actuated shift element. If the end face of the com-
mand valve (Fig. 115) is subjected to the shift valve
pressure (p-SV) (shift phase), then the shift pressure
(p-S) is switched to the activating element and the
overlap pressure (p-Ü) is switched to the deactivating
element.
Fig. 115 Command Valve
1 - HOLDING CLUTCH B1
2 - DRIVING CLUTCH K1
3 - 1-2/4-5 COMMAND VALVE
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Shift Valve Holding Pressure
The holding pressure shift valve (1) (Fig. 116) is
actuated by the pressures present at the end face in
the actuators and a spring. It assigns the working
pressure (p-A) to the actuator with the higher pres-
sure (taking into account the spring force and the
effective surface area). The other element of the shift
group is then unpressurized. The valve switches over
only during the shift phase and only at a certain
pressure ratio between the overlap pressure (p-Ü)
and the shift pressure (p-S).
Fig. 116 Shift Valve Holding Pressure
1 - HOLDING PRESSURE SHIFT VALVE
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AUTOMATIC TRANSMISSION NAG1 - SERVICE INFORMATION
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