AW 50-40, 50-42, 50-42LE:
AF 14, 20, 22
Transmission Identification Plate
1208
818
50-42
Example:
50-42LE = Transmission designation
1208818 = Volvo P/N
95 = Year of manufacture
F = Manufactured in June (A=January and so on.
NOTE! The letter I is not used.)
W = Transmission 50-42LE*
8 = Transmission manufactured for Volvo
1243 = Manufacturing number, starting with 0001 each month.
95
F
W
8
1243
POSITION
Applied Elements
B2 = Intermediate Clutch
B3 = Low & Reverse Clutch
B4 = Underdrive Brake Band
C1 = Forward Clutch
C2 = Direct Clutch
C3 = Underdrive Clutch
P
Parking
R
Reverse
N
Neutral
*) LE indicates that the transmisson has the lock-up function and
is electronically controlled.
This transmission is an AW50-42, manufactured in June 1995.
S1 S2
C1
C2 C3
B1
B2
B3 B4
F1 F2
F3
1st
2nd
D
3rd
4th
F1 = Intermediate Sprag
F2 = Low Sprag
F3 = Underdrive Sprag
1st
3
2nd
3rd
S1 = Shift Solenoid A
S2 = Shift Solenoid B
L
1st
2nd
94659
Caution: This kit contains a Duraprene valve body cover gasket. This gasket is intended to be used on covers that are not used in
conjunction with a transmission mount. The torsional loads placed on the gasket surfaces will result in a leak on this application. It
is recommended to use a sealer in place of the gasket.
Clutch Clearances
Overrun Clutch
.023" - .057"
Intermediate Clutch
.045" - .073"
Low/Reverse Clutch
.074" - .095"
Forward Clutch
Direct Clutch
Underdrive Clutch
Underdrive Brake Band
End Play = .015" - .035"
.060" - .074"
with 4 plates
.045" - .058"
with 3 plates
.060" - .074"
with 4 plates
.045" - .058"
with 3 plates
.060" - .074"
with 4 plates
.045" - .058"
with 3 plates
.216" - .276"
Line Pressures
At idle (800 -850 rpm): 60 - 85 psi at idle.
Line pressures for all engine models.
At stall: 170 - 256 psi.
Notes: Stall speeds vary with engine model.
All pressure readings taken in Drive
or Reverse.
Underdrive Brake Band Procedure:
Install piston in reverse order of disassembly. Measure
length of piston stem protruding from case. Apply air
to servo and re-measure length of piston stem. The
difference is the piston stroke length. Specification is
.216" - .276". Adjust as needed.
Resistance for Components
Component
Remarks
Resistance ( )
Engine Speed RPM Sensor
Solenoid A
Solenoid B
300 - 600
Resistance between the solenoid
pin and the solenoid cover/
transmission housing
Solenoid Lock-up
Solenoid - Pressure Control
Oil Temperature Sensor
10 - 15
10 - 15
10 - 15
Resistance between the solenoid pins
Temperature
°C (°F)
-2-
2-6
0 (32)
1700 - 2300
20 (68)
765 - 1035
40 (104)
340 - 460
80 (176)
107 - 143
100 (212)
64 - 86
150 (302)
23 - 31
Checking System Pressure
Checking Kickdown Switch Resistance
Depress brake pedal.
Move gear selector into the various positions
and record system pressure.
The ohmmeter should read approx. 0 Ω with the
accelarator pedal (AP) fully depressed and infinite
resistance in all other positions.
Table, AW TCM 50-42 System Pressure
Engine
Idling Speed Gear Position Line Pressure
(rpm)
(MPa) (psi)
B5202
850
D/R
0.4 / 0.6
(85 / 57)
B5204S
800
D/R
0.4 / 0.6
(85 / 57)
B5254S1
8501
D/R
0.4 / 0.6
(85 / 57)
B5252S
850
D/R
0.4 / 0.6
(85 / 57)
B5234S
850
D/R
0.4 / 0.6
(85 / 57)
B5234T
1)
850
D/R
Checking Oil Temperature Sensor Resistance
Connect an ohmmeter between the transmission connector terminals 12 and 13 (transmission side).
0.4 / 0.6
(85 / 57)
800 rpm, model years 1992-1993
Correct Installation
Lead In Chamfer
Pump Seal Installation
Some, but not all, Toyota pumps
feature a deep lead-in chamfer on
the pump seal bore. To ensure
proper contact between the seal
and the seal bore, the seal should
be pressed in until it bottoms in
the bore. This should be standard
procedure on all seals that use a
nose gasket for bore sealing. This
may result in the seal being
installed below the top of the
pump bore face.
Full Contact Between
Metal Case and
Pump Bore
Pump Body
Rubber Nose on Seal
Incorrect Installation
Lead In Chamfer
Full Contact Between
Rubber Nose and
bottom of Bore
Poor Contact Between Metal
Case and Pump Body
Pump Body
Rubber Nose on Seal
-3-
No Contact Between
Rubber Nose and
bottom of Bore
Volvo/Saab AW50-42LE
"Rear" Valve Body, "Rear" Side
Speed Sensors
Pressure Relief
Valve and
Spring
Check Valve
and Spring
Volvo/Saab AW50-42LE
"Center" Valve Body, "Front" Side
Large
Filter
Screen
Requires Four Rubber Checkballs
5.0mm (.197" In Diameter
4 Small
Filter
Screens
Copyright © 1998 ATSG
Copyright © 1998 ATSG
-4-
Volvo/Saab AW50-42LE "Center" Valve Body, "Rear" Side
Check Valve
Assembly
Bypass Valve
and Spring
If the spacer plate has only one small hole over either
location DO NOT install a checkball
This checkball can go in
either location indicated by
the arrows.
Check Valve
and Spring
If the spacer plate has one large and one small
hole over location INSTALL a checkball.
Requires Four Rubber Checkballs
5.0mm (.197" In Diameter
Copyright © 1998 ATSG
-5-
Rear Valve Body Accumulator Pistons
Underdrive
Accumulator
Piston
Solenoid B
Direct Clutch
Accumulator
Piston
Note: Illustration for reference only.
Valves and springs may vary between
makes and models
Intermediate
Accumulator
Piston
Front Valve Body Solenoid Location
Lock-Up
Solenoid
Pressure Control Solenoid
Shift Solenoid A
Shift
Solenoid B
-6-
Air Check Passages
Sprag Rotation
Low Sprag
Freewheel Counterclockwise; Lock Clockwise
Outer Hub
Held
Overrun
Clutch
Intermediate Sprag
Intermediate
Clutch
Intermediate
Hub
Direct Clutch
Forward
Clutch
Overrun Hub
With Intermediate Hub Held, Overrun
Hub Freewheels Clockwise; Locks
Counterclockwise
Low/Reverse
Clutch
Held
Freewheels Counterclockwise;
Locks Clockwise
7
Forward
Accumulator
2nd Brake
Clutch
Underdrive
Clutch
Low
Sprag
Direct
Clutch
Underdrive
Brake
Intermediate
Sprag
Forward
Clutch
Underdrive
Brake
Accumulator
Overrun
Clutch
Underdrive
Sprag
SOME OF THE INFORMATION IN THIS BOOKLET MAY HAVE BEEN PROVIDED
OR APPROVED BY THE AUTOMATIC TRANSMISSION SERVICE GROUP AND/OR
THE AUTOMATIC TRANSMISSION REBUILDERS ASSOCIATION. THE INFORMATION CONTAINED HEREIN IS ACCURATE TO THE BEST OF OUR KNOWLEDGE.
WE ARE NOT RESPONSIBLE FOR ANY INACCURACIES OR WARRANTY CLAIMS
WHICH MAY RESULT FROM THE USE OF THIS INFORMATION.