1995 NISSAN ALMERA N15 Service Manual

MODEL34X81 DESCRIPTION
Cross-sectional View(Cant' d)

Reverse clutchdrum Band
servo piston
High clutch
Front planetary gear
Reduction piniongear
Low

&
reverse brake
Idler gear
Forward one-way clutch Low
one-way clutch
Rear planetary gear
Forward clutch
Overrun clutch

,"'I
Reverse
clutch
Brake band
Final gear

AT-9
Oil
pump assembly
Converterhousing
Torque converter
Input shaft

c
...
-;-

I

L_

Differential case

SAT101EA
•

MODEL34X68

4th

speed cut
valve
Overrunclutch
control
valve
Lock-up
control
valve
Torque '~..•.•
converter
>..•.••••

relief ..••.....
valve ..
Governor
valve
X:Drain port
: Orifice DESCRIPTION
Hydraulic ControlCircuit
Low
&
reverse
brake
High clutch
Detent valve
AT-10 Forward
clutch
1-2
shift
valve

SAT1961

MODEL34X69AND34X70 DESCRIPTION
Hydraulic ControlCircuit(Cont'd)
00 cancel
solenoid
Lock-up
control
valve

X :
Drain port
•

1-2
shift valve
Forward
clutch
accumulator
valve
High
clutch
Torque
converter
Oil
pump

i

=:= :
Orifice
Overrun
clutch
II

control
valve
4th
speed
cut
valve
SAT509H

AT-11

DESCRIPTION
Hydraulic ControlCircuit(Cont'd)
MODEL 34X80
1-2

shift
valve
1-2
accumulator

valve

~ 1

i i

xU

::l.

x

-

Detent valve

L-
_
-

cooler- Low

&
reverse
Torque brake
Oil converter Overrun ReverseForward

I
,clutch Highclutch Bandservo clutchclutch

pump
I
tJ
(Jp::-
(T,
tf1
--;::;-;r.]O~
~J
1~
g~ (~ ~~
l]
J~ ~

~iJ -
N
~%~
UL"-'
IU4~1~~

C-1
-!
~frEJ!
1

6 ~, -~

m
~,--J
0

- ILJ
,-O...J

r
ar

r::r=< I'---,
II .(
I'
IJ

,'-
~
,,'
(
-

I -

=-
~tL ',
~H

I~

~ ~M~ ·

F=
f='l .,.11
1-
~I" ~

" ~r'
I
L...---...l
reducing_

L
2-3 .4-2
I
~valve= ~
shift ~seq!!.enc~
~ -valve ,-=-valve---j
h
1J;;;.Q"t....

=--=-.J
II
Ma~alve
lJl.
"~'L--.J

:;;; ~I 11
p
URNb'21
nn

=-.--'
I~
II
'i-V
D

I I -,

." c:
I
Throttle
':fj'~1 .

modifier

If.'

valve .

II
I
1"
";'Jnn!
l...,

:=~-' \~

Throttle valve ~Klckdown
modifier
valve
X
:Drain port
:::::: :Orifice
Pressure
regulator
valve
!lJF

D

00 cancel
I
~Y&

solenoid •
Pressure
modifier valve
Lock-up_
control
valve

4th

speed cut
valve
Overrun
clutch
control-
valve

-=~
I
r

rr=-
LL:
J~

L~

Torque
x'"~

converter
i
i

relief '
valve
2~ '-

3-4 shift valv~-HiliJI
Governor../l ..-
valve

SAT1971

AT-12

MODEL34X81
4th speed
cut valve
Lock-up
control valve
Overrun
clutch
control valve
3-4 shift valve
X Drainport

:::::= :
Orifice Oil
pump Torque
converter DESCRIPTION
Hydraulic ControlCircuit(Cont'd)
High clutch
AT-13 1-2
shift valve
SAT1981
•

DESCRIPTION
Shift Mechanism
CONSTRUCTION

18

,:-1
SAT214H

ill
Torque converter

@
Oilpump

@
Input shaft

@
Brake band

@
Reverse clutch

@
High clutch

o
Front sungear

@
Front pinion gear
@

Front internal gear

@l
Front planetary carrier

@
Rear sungear

@
Rear pinion gear

@
Rear internal gear

@
Rear planetary carrier

@
Forward clutch

@
Forward one-way clutch
@

Overrun clutch

@
Lowone-way clutch

@
Low
&
reverse brake

@
Parking pawl

@
Parking gear

@
Output shaft

@
Idlegear

@
Output gear

FUNCTION OFCLUTCH ANDBRAKE

Glutch andbrake components Abbr. Function
Reverse clutch
RIG
To
transmit inputpower tofront sungear
High clutch
HIG
To
transmit inputpower tofront planetary carrier
Forward clutch
FIG
To
connect frontplanetary carrierwithforward one-way clutch
Overrun clutch
OIG
To
connect frontplanetary carrierwithrearinternal gear
Brake band BIBTo
lock front sungear
Forward one-way clutch
F/O.G
When
forward clutchisengaged, tostop rearinternai gearfrom rotat-
ing inopposite direction againstenginespeed
Low one-way clutch LlO.GTo
stop front planetary carrierfromrotating inopposite direction
against enginespeed
Low
&
reverse brake L
&
RIB To
lock front planetary carrier

AT-14

DESCRIPTION
Shift Mechanism (Cont'd)
OPERATION OFCLUTCH ANDBRAKE

Bandservo
ForwardLow
Low
&

Shift posi- Reverse
HighForward
Overrun
Lock-upRemarks
tion clutch clutchclutchclutch 2nd
3rd4thone-way
one-way reverse
apply release
applyclutch
clutch brake
P PARK
POSITION
0 0REVERSE
POSI-
R TION
N NEUTRAL
POSI-
TION
1st 0'10

••

D 2nd
0'10
0

•
Automatic
shift
'4 00'10
'2@
@

•
1<-->2<-->3<-->4
3rd
4th 0@ '3@
@0
0
1st 00

••
Automatic
shift
2 1<-->2
2nd 00 0

•

1st 00

•
•
0
Locks
(heldsta-
1 tionary)
in1st
2nd 00 0

•
speed
1
<--
2
'1 Operates whenoverdrive switchissel to"OFF".
'2 Oilpressure isapplied toboth 2nd"apply" sideand3rd"release" sideofband servo piston. However, brakebanddoes notcontract
because oilpressure areaonthe "release" sideisgreater thanthatonthe "apply" side.
'3 Oilpressure isapplied to4th "apply" sideincondition '2above, andbrake bandcontracts.

'4 AIT
will notshift to4th when overdrive switchisset to"OFF" position.

o
Operates.
• Operates. During"progressive" acceleration.
@ Operates butdoes notaffect power transmission.

Control System
CONTROL SYSTEM

Engine
AIT
•

Lock-up cancel
solenoid'1
Overdrive
control switch
1:1

Governor valve

I
11
1

I

1
1

OD cancel solenoid :

; I

L
J
AT-15
'1:
Equipped onmodel
34X69, 34X70and34X80
: Electrical signal
.... :Hydraulic pressure

SAT985HA

NOTE DESCRIPTION
AT-16