AW 50-40, 50-42, 50-42LE:
AF 14, 20, 22
94659
Applied Elements B2 = Intermediate Clutch B3 = Low & Reverse Clutch B4 = Underdrive Brake Band C1 = Forward Clutch C2 = Direct Clutch C3 = Underdrive Clutch F1 = Intermediate Sprag F2 = Low Sprag F3 = Underdrive Sprag S1 = Shift Solenoid A S2 = Shift Solenoid B
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.
*) LE indicates that the transmisson has the lock-up function and is electronically controlled.
This transmission is an AW50-42, manufactured in June 1995.
Transmission Identification Plate
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.
50-42
1208 818
8 1243 W
95 F
POSITION S1 S2 C1 C2 C3 B1 B2 B3 B4 F1 F2 F3
Parking Reverse Neutral
1st 2nd 3rd 4th 1st 2nd 3rd 1st 2nd L
P R N
D
3
Line Pressures Clutch Clearances
Overrun Clutch .023" - .057"
Intermediate Clutch .045" - .073"
Low/Reverse Clutch .074" - .095"
.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"
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.
Forward Clutch
Direct Clutch
Underdrive Clutch Underdrive Brake Band
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.
End Play = .015" - .035"
Component Remarks Resistance ( )
Engine Speed RPM Sensor 300 - 600
Solenoid A 10 - 15
Solenoid B 10 - 15
Solenoid Lock-up 10 - 15
Solenoid - Pressure Control Resistance between the solenoid pins 2 - 6
0 (32) 1700 - 2300
20 (68) 765 - 1035
Oil Temperature Sensor 40 (104) 340 - 460
80 (176) 107 - 143
100 (212) 64 - 86
150 (302) 23 - 31
Temperature
°C (°F)
Resistance between the solenoid pin and the solenoid cover/
transmission housing
Resistance for Components
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.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 850 D / R 0.4 / 0.6
(85 / 57)
1) 800 rpm, model years 1992-1993
Checking System Pressure
Depress brake pedal.Move gear selector into the various positions and record system pressure.
Checking Kickdown Switch Resistance
The ohmmeter should read approx. 0 Ω with the accelarator pedal (AP) fully depressed and infinite resistance in all other positions.Checking Oil Temperature Sensor Resistance
Connect an ohmmeter between the transmission con- nector terminals 12 and 13 (transmission side).Incorrect Installation Correct Installation
Full Contact Between Metal Case and Pump Bore
Lead In Chamfer
Pump Body
Full Contact Between Rubber Nose and bottom of Bore
Poor Contact Between Metal Case and Pump Body
Pump Body
No Contact Between Rubber Nose and bottom of Bore Rubber Nose on Seal
Rubber Nose on Seal
Lead In Chamfer
Table, AW TCM 50-42 System Pressure
Copyright © 1998 ATSG
Volvo/Saab AW50-42LE
"Rear" Valve Body, "Rear" Side
Check Valve and Spring
Speed Sensors
Requires Four Rubber Checkballs 5.0mm (.197" In Diameter
Volvo/Saab AW50-42LE
"Center" Valve Body, "Front" Side
4 Small Filter Screens Large
Filter Screen
Pressure Relief Valve and
Spring
Copyright © 1998 ATSG
Volvo/Saab AW50-42LE "Center" Valve Body, "Rear" Side
Copyright © 1998 ATSG Check Valve
Assembly Bypass Valve
and Spring
Check Valve and Spring This checkball can go in
either location indicated by the arrows.
If the spacer plate has only one small hole over either location DO NOT install a checkball
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
Solenoid B
Direct Clutch Accumulator Piston
Intermediate Accumulator Piston
Underdrive Accumulator Piston
Rear Valve Body Accumulator Pistons
Note: Illustration for reference only.
Valves and springs may vary between makes and models
Shift Solenoid B
Shift Solenoid A Lock-Up
Solenoid Pressure Control Solenoid
Front Valve Body Solenoid Location
Air Check Passages Sprag Rotation
Intermediate Clutch Overrun
Clutch
Outer Hub Held
Freewheel Counterclock- wise; Lock Clockwise
Overrun Hub Intermediate
Hub
Direct Clutch
Forward Clutch
Low/Reverse Clutch
Held
Intermediate Sprag
With Intermediate Hub Held, Overrun Hub Freewheels Clockwise; Locks
Counterclockwise
Freewheels Counterclockwise;
Locks Clockwise
Low 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 INFOR- MATION 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.
2nd Brake Clutch
Intermediate Sprag
Overrun
Clutch Underdrive Sprag
Low Sprag Underdrive Clutch
Forward Accumulator
Direct Clutch
Forward Clutch
Underdrive Brake Accumulator
Underdrive Brake
