Dodge Sprinter. Manual - part 287

Shift Pressure Shift Valve

When the multiple-disc brake B1 (3) is activated,

the working pressure (p-A) is applied to the end face
of the 1-2 / 4-5 shift pressure shift valve (4) (Fig. 117)
via the command valve (1). Its shift state is main-
tained during the shift phase by substituting the
shift element pressure acting on its end face (and
which is variable during the shift phase) with a cor-
responding constant pressure. When the multi-plate
clutch K1 (2) is activated, the end face of the shift
valve is unpressurized during the stationary and
shift phases, so the shift state is maintained during
the shift phase in this case too.

Lubrication Pressure Regulating Valve

At the working pressure regulating valve surplus

oil is diverted to the lubrication pressure regulating
valve (1) (Fig. 118), from where the lubrication pres-
sure (p-Sm) is used in regulated amounts to supply
the transmission lubrication system including the
torque converter.

Fig. 117 Shift Pressure Shift Valve

1 - 1-2/4-5 COMMAND VALVE
2 - DRIVING CLUTCH K1

3 - HOLDING CLUTCH B1
4 - 1-2/4-5 SHIFT PRESSURE SHIFT VALVE

Fig. 118 Lubrication Pressure Regulating Valve

1 - LUBRICATION PRESSURE REGULATING VALVE

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AUTOMATIC TRANSMISSION NAG1 - SERVICE INFORMATION

Shift Pressure Regulating Valve

The shift pressure is determined by the shift pres-

sure regulating solenoid valve and the shift pressure
regulating valve (3) (Fig. 119). In addition, pressure
from the clutch K2 (1) is also present at the annular
surface (2) of the shift pressure regulating valve (3).
This reduces the shift pressure in 2nd gear.

Regulating Valve Pressure Regulating Valve

The regulating valve pressure (p-RV) is set at the

regulating valve pressure regulating valve (1) (Fig.
120) in relation to the working pressure (p-A) as far
as the maximum pressure.

Shift Valve Pressure Regulating Valve

The non-constant regulating valve pressure (p-RV)

is regulated to a constant shift valve pressure (p-SV)
at the shift valve pressure regulating valve (1) (Fig.
121) and is used to supply the 1-2 and 4-5 / 3-4 / 2-3
solenoid valves and the torque converter lockup
clutch PWM solenoid valve.

Fig. 119 Shift Pressure Regulating Valve

1 - SHIFT PRESSURE REGULATING VALVE

Fig. 120 Regulating Valve Pressure Regulating

Valve

1 - REGULATING VALVE PRESSURE REGULATING VALVE

Fig. 121 Shift Valve Pressure Regulating Valve

1 - SHIFT VALVE PRESSURE REGULATING VALVE

AUTOMATIC TRANSMISSION NAG1 - SERVICE INFORMATION

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REMOVAL

(1) Drain transmission oil by unscrewing oil drain

plug (8) (Fig. 122).

NOTE: If the transmission fluid is burnt or contains
abraded particles, the oil cooler lines and oil cooler
must be flushed out.

(2) Move selector lever to position “P”.
(3) Raise vehicle.
(4) Remove bolt (3) (Fig. 123) and screw (1) hold-

ing the heat shield (2) to the transmission.

(5) Disconnect 13-pin plug connector (1) (Fig. 124).

Turn bayonet lock of guide bushing (2) anti-clock-
wise.

(6) Loosen guide bushing (2) and remove from

transmission housing.

Fig. 122 Remove Electrohydraulic Unit

1 - HEAT SHIELD
2 - ELECTROHYDRAULIC UNIT
3 - BOLT
4 - OIL FILTER
5 - OIL PAN
6 - CLAMPING ELEMENT
7 - BOLT
8 - DRAIN PLUG
9 - DRAIN PLUG GASKET
10 - 13-PIN PLUG CONNECTOR
11 - BOLT
12 - GUIDE BUSHING

Fig. 123 Remove Heat Shield

1 - SCREW
2 - HEAT SHIELD
3 - BOLT

Fig. 124 Remove Wiring Connector Plug

1 - PLUG CONNECTOR
2 - GUIDE BUSHING

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AUTOMATIC TRANSMISSION NAG1 - SERVICE INFORMATION

(7) Detach oil pan (5) (Fig. 125).
(8) Remove oil filter (4).
(9) Unscrew Torx socket bolts (3) and remove elec-

trohydraulic control module (2).

DISASSEMBLY

(1) Remove electrohydraulic unit from the vehicle.

(Refer

TRANSMISSION/AUTOMATIC

TRANSMISSION

NAG1/ELECTROHYDRAULIC

UNIT - REMOVAL)

(2) Remove solenoid caps (1, 2) (Fig. 126).
(3) Unscrew Torx

t socket bolts (3, 4) (Fig. 126).

NOTE: Pay attention to the different lengths of the
Torx

socket bolts.

(4) Remove leaf springs (5).
(5) Withdraw solenoid valves (6 - 11) from shift

plate (13).

NOTE: Check O-rings on solenoid valves for dam-
age and replace if necessary.

(6) Bend away retaining lug on stiffening rib on

transmission oil temperature sensor.

(7) Remove electrohydraulic control module (12)

from the shift plate (13).

Fig. 125 Remove Electrohydraulic Unit

Fig. 126 Electrical Unit Components

1 - SOLENOID CAP
2 - SOLENOID CAP
3 - BOLT - M6X32
4 - BOLT - M6X30
5 - LEAF SPRING
6 - MODULATING PRESSURE REGULATING SOLENOID VALVE
7 - SHIFT PRESSURE REGULATING SOLENOID
8 - 3-4 SHIFT SOLENOID
9 - TORQUE CONVERTER LOCK-UP SOLENOID
10 - 1-2/4-5 SHIFT SOLENOID
11 - 2-3 SHIFT SOLENOID
12 - ELECTRICHYDRAULIC CONTROL MODULE
13 - SHIFT PLATE

AUTOMATIC TRANSMISSION NAG1 - SERVICE INFORMATION

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