OUTPUT SHAFT SEAL
REMOVAL ............................125
INSTALLATION ........................125
PARK LOCK CABLE
REMOVAL ............................125
INSTALLATION ........................126
PISTONS
DESCRIPTION ........................128
OPERATION ..........................128
PLANETARY GEARTRAIN
DESCRIPTION ........................130
OPERATION ..........................130
DISASSEMBLY ........................131
ASSEMBLY ...........................131
SHIFT MECHANISM
DESCRIPTION ........................133
OPERATION ..........................133
REMOVAL ............................134
INSTALLATION ........................135
SOLENOID
DESCRIPTION ........................136
OPERATION ..........................138
TEMPERATURE SENSOR/PARK-NEUTRAL
CONTACT
DESCRIPTION
DESCRIPTION - PARK/NEUTRAL CONTACT . 139
DESCRIPTION - TRANSMISSION
TEMPERATURE SENSOR ..............140
OPERATION
OPERATION - PARK/NEUTRAL CONTACT . . 140
OPERATION - TRANSMISSION
TEMPERATURE SENSOR ..............141
TORQUE CONVERTER
DESCRIPTION ........................141
OPERATION ..........................143
REMOVAL ............................146
INSTALLATION ........................146
TORQUE CONVERTER HUB SEAL
REMOVAL ............................147
INSTALLATION ........................147
AUTOMATIC TRANSMISSION -
NAG1
DESCRIPTION
The NAG1 automatic transmission (Fig. 1) is an
electronically controlled 5-speed transmission with a
lock-up clutch in the torque converter. The ratios for
the gear stages are obtained by 3 planetary gear sets.
Fifth gear is designed as an overdrive with a high-
speed ratio.
The gears are actuated electronically/hydraulically.
The gears are shifted by means of an appropriate
combination of three multi-disc holding clutches,
three multi-disc driving clutches, and two freewheel-
ing clutches.
Electronic transmission control enables precise
adaptation of pressures to the respective operating
conditions and to the engine output during the shift
phase which results in a significant improvement in
shift quality.
Furthermore, it offers the advantage of a flexible
adaptation to various vehicle and engines.
Basically, the automatic transmission with elec-
tronic control offers the following advantages:
• Reduces fuel consumption.
• Improved shift comfort.
• More favourable step-up through the five gears.
• Increased service life and reliability.
• Lower maintenance costs.
TRANSMISSION IDENTIFICATION
The transmission name, NAG1, means New Auto-
matic Gearbox, generation 1.
The transmission can be generically identified
visually by the presence of a round 13-way connector
located near the front corner of the transmission oil
pan, on the right side. Specific transmission informa-
tion can be found stamped into a pad on the left side
of the transmission, above the oil pan rail.
TRANSMISSION GEAR RATIOS
The gear ratios for the NAG1 automatic transmis-
sion are as follows:
1st Gear .............................3.59:1
2nd Gear ............................2.19:1
3rd Gear ............................1.41:1
4th Gear ............................1.00:1
5th Gear ............................0.83:1
Reverse .............................3.16:1
TRANSMISSION HOUSING
The converter housing and transmission are made
from a light alloy. These are bolted together and cen-
tered via the outer multi-disc carrier of multi-disc
holding clutch, B1. A coated intermediate plate pro-
vides the sealing. The oil pump and the outer multi-
disc carrier of the multi-disc holding clutch, B1, are
bolted to the converter housing. The stator shaft is
pressed into it and prevented from rotating by
splines. The electrohydraulic unit is bolted to the
transmission housing from underneath. A sheet
metal steel oil pan forms the closure.
21 - 2 AUTOMATIC TRANSMISSION - NAG1 VA
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