AU T OM AT I C T RAN SM I SSI ON N AG1 - SERV I CE I N FORM AT I ON
DESCRIPTION
The NAG1 automat ic transmission (Fig. 1) is an
electronica lly con trolled 5-speed tr ansmission with a
lock-up clut ch in the torque con vert er. The r atios for
the gear st ages a re obta ined by 3 plan etar y gea r sets.
Fifth gea r is designed as an overdrive with a high-
speed rat io.
NAG1 iden tifies a family of tra nsmissions and
mean s “N”ew “A”u tomatic “G”earbox, generation 1.
Var ious ma rketin g names are associat ed with the
NAG1 family of t ransm issions, depending on the
transmisson var iation being u sed in a specific vehi-
cle. Some exam ples of the marketing names a re:
W5A300, W5A380, a nd W5A580. The ma rketing
name can be interpret ed as follows:
• W = A transmission using a h ydrau lic torque
conver ter.
• 5 = 5 forwar d gear s.
• A = Automatic Tran sm ission.
• 580 = Ma xim um inpu t t orque capacit y in New-
ton met ers.
The gears are actuated electr onica lly/hydr aulically.
The gears ar e sh ifted by means of an appropriate
combin ation of th ree mu lti-disc holding clutches,
three multi-disc driving clutches, and t wo freewheel-
ing clutches.
Elect ronic t ransmission cont rol en ables pr ecise
adapta tion of pressures to th e respective opera tin g
conditions and to the engine out pu t dur ing the shift
ph ase wh ich results in a significant improvemen t in
sh ift qua lity.
Furthermore, it offers the advant age of a flexible
adapta tion to var ious vehicle and engines.
Basica lly, the au tomatic tran sm ission with elec-
tronic control offer s t he following a dvantages:
• Redu ces fuel consum ption.
• Improved shift com fort.
• Mor e favoura ble step-up through t he five gears.
Fig. 1 NAG1 Automatic Transmission
1 - TORQUE CONVERTER 11 - PARKING LOCK GEAR
2 - OIL PUMP 12 - INTERMEDIATE SHAFT
3 - DRIVESHAFT 13 - FREEWHEEL F2
4 - MULTI-DISC HOLDING CLUTCH B1 14 - REAR PLANETARY GEAR SET
5 - DRIVING CLUTCH K1 15 - CENTER PLANETARY GEAR SET
6 - DRIVING CLUTCH K2 16 - ELECTROHYDRAULIC CONTROL UNIT
7 - MULTI-DISC HOLDING CLUTCH B3 17 - FRONT PLANETARY GEAR SET
8 - DRIVING CLUTCH K3 18 - FREEWHEEL F1
9 - MULTI-DISC HOLDING CLUTCH B2 19 - STATOR SHAFT
10 - OUTPUT SHAFT 20 - TORQUE CONVERTER LOCK-UP CLUTCH
VA AUTOMATIC TRANSMISSION NAG1 - SERVICE INFORMATION 21 - 3
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