Mercedes-Benz Sprinter / Dodge Sprinter. Service manual — part 456

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

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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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(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

to

21

-

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

T

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

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. 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

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(8) Note the locations of the major shift valve

group components for assembly reference. (Fig. 127)

A - Operating and Lubricating Pressure Regulating

valves and 2-3 Overlap valve

B - 1-2/4-5 Shift Group and Shift, Shift Valve, and

Regulating Valve Pressure Regulating Valves

C - 3-4 Shift Group
D - 2-3 Shift Group, TCC Lock-up, and B2 Regu-

lating Valves

NOTE: Pay great attention to cleanliness for all
work on the shift plate. Fluffy cloths must not be
used. Leather cloths are particularly good. After dis-
mantling, all parts must be washed and blown out
with compressed-air, noting that parts may be
blown away.

(9) Unbolt leaf spring (5) (Fig. 128).
(10) Unscrew Torx

t bolts (1) (Fig. 128).

(11) Remove valve housing (2) from valve body (4)

(Fig. 128).

(12) Remove sealing plate (3).

Fig. 127 Shift Valve Group Locations

A - OPERATING AND LUBRICATING PRESSURE REGULATING
VALVES AND 2-3 OVERLAP VALVE
B - 1-2/4-5 SHIFT GROUP AND SHIFT, SHIFT VALVE, AND REG-
ULATING VALVE PRESSURE REGULATING VALVES
C - 3-4 SHIFT GROUP
D - 2-3 SHIFT GROUP, TCC LOCK-UP AND B2 REGULATING
VALVES

Fig. 128 Shift Plate Components

1 - BOLTS - 29
2 - VALVE HOUSING
3 - SEALING PLATE
4 - VALVE BODY
5 - LEAF SPRING

Fig. 129 Solenoid Valve Strainer Locations

1 - SOLENOID VALVE STRAINERS

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