ISUZU AXIOM 2002 Service Repair Manual

7A±87 AUTOMATIC TRANSMISSION (4L30±E)
Disassembly
1. Position overrun clutch assembly upright, using the
overdrive internal gear as a support.

Remove snap ring (1).
252RS009
2. Remove overdrive carrier assembly (2), sun gear (3)
and turbine shaft (4).
3. Remove snap ring (5), backing plate (6), and clutch
plates (7).
4. Compress diaphragm spring with the J±23327±91
compressor, then remove snap ring (8).
252RS010
5. Remove overrun roller clutch cam (9) and roller clutch
assembly (10).
6. Remove overrun clutch release spring retainer (11)
and diaphragm spring (12).
7. Remove piston assembly (13) from overrun clutch
drum (14).
8. Remove turbine shaft seal rings (15).
Inspection And Repair
Overdrive Carrier Check

Check pinion end play with a feeler gauge.
Clearance: 0.24mm±0.64mm (0.0094in±0.025in)
If clearance is outside specified value, replace overdrive
carrier assembly.
252RS011
Visual Check:
If any damage, deformation or local wear is found,
replace the damaged part.
Reassembly
1. Install turbine shaft seal rings (15) with grease
(petroleum jelly).
241RS008

7A±88
AUTOMATIC TRANSMISSION (4L30±E)
2. Install the J±38555 inner installer on the drum (14).

Pre±install piston assembly into J±38555 outer
installer.

Install overrun clutch piston assembly (13). Use the
outer installer while pushing piston into drum (14).

Remove the installer.
252RS012
252RS013
3. Install diaphragm spring (12).
4. Install overrun clutch release spring retainer (11) (lip
faces upwards), overrun roller clutch assembly (10),
and cam (9).
5. Place snap ring loosely on spring retainer.

Hold the J±23327±91 compressor in a vise and
compress piston return spring with compressor.

Set snap ring (8) in ring groove.

Remove the compressor.
6. Install clutch plates (7), start with steel plate and
alternate with lined plates.
7. Install backing plate (6).
8. Install snap ring (5).
9. Install overdrive sun gear with countersink pointing
downwards.
10. Install the overdrive carrier assembly (2).
NOTE: Tu r n t h e a s sembly in a counter±clockwise
direction only until roller clutch enters the outer race.
After installation, rotate the assembly and listen for loose
rollers.
11. Install turbine shaft (4) and snap ring (1).

7A±89 AUTOMATIC TRANSMISSION (4L30±E)
Main Data And Specification
General Specifications
Remarks
ModelTHM 4L30±E
EngineV6 3.5L 6VE1DOHC
TypeAutomatic four speed overdrive in
4th gear lock±up clutch torque
converter
Shift controlHydraulic
Control systemsShift patternElectronicControl systemsShift qualityElectronic
Lock±up clutchElectronic
1st2.856
2nd1.618
Gear ratio3rd1.000
4th (O/D)0.723
Reverse2.000
Gear setNoiseless, high torque capability
Oil usedNameATF DEXRON)±IIIOil usedQ'ty liter (qt)8.6 (9.1)
Torque converter2,100 + 150Stall speed (rpm)
Reverse clutchRC4
Second clutchC26Number of discsThird clutchC36Number of discs
Brake bandDouble wrap
Fourth clutchC42Number of discsOverrun clutchOC1Number of discs
OverdriveOFW10Number of rollers
PrincipalPFW26Number of sprags
Input sun gear30
Pinion gear19
Ravigneaux plan-Long pinion23g
etary gear setRing gear90
Long pinion19Number of teeth
Output sun gear46
Odi l
Sun gear31
Overdrive plane-
tary gear setPinion gear24tary gear set
Ring gear81

7A±90
AUTOMATIC TRANSMISSION (4L30±E)
Torque Specifications
E07R200003

7A±91 AUTOMATIC TRANSMISSION (4L30±E)
E07RY003

7A±92
AUTOMATIC TRANSMISSION (4L30±E)
E07R200002

7A±93 AUTOMATIC TRANSMISSION (4L30±E)
Special Tools
ILLUSTRATIONTOOL NO.
TOOL NAME
J±23075
Spring compressor
(For servo piston)
J±38450±A
Third clutch snap ring
compressor
J±23075±12
Third clutch spring
compressor adapter
(Use with J±23075)
J±23084
Third clutch piston
installer
J±23327
Third clutch spring
compressor
J±23080±A
Second clutch piston
installer
ILLUSTRATIONTOOL NO.
TOOL NAME
J±23085±A
Selective washer
gauging tool
J±23327±90
Fourth clutch spring
compressor
(Use with J±23327)
J±38553
3/4 Accumulator piston
fitter
J±41096
Cover remover
(Use with J±38584)
J±38584
Slide hammer adapter
(Use with J±23907)
J±38554
Fourth clutch piston fitter

7A±94
AUTOMATIC TRANSMISSION (4L30±E)
ILLUSTRATIONTOOL NO.
TOOL NAME
J±38588
Guide pins; adapter
case to main case
J±38555
Overrun clutch piston
seal installer set
J±3387±2
Guide pins; gasket and
transfer plate to valve
body
J±25022
Turbine shaft puller
(Use with J±24773±1)
J±23129
Oil seal remover
(Use with J±23907
and J±38584)
J±38557
Oil pump centering tool
ILLUSTRATIONTOOL NO.
TOOL NAME
J±23082±01
Oil pump rotation tool
J±25025±B
Guide pins; valve body
to main case
J±38428
Servo piston fitter
J±23327±91
Overrun clutch spring
compressor
J±38559±A
3/4 Accumulator piston
cover compressor
J±8763±02
Holding fixture

7A±95 AUTOMATIC TRANSMISSION (4L30±E)
ILLUSTRATIONTOOL NO.
TOOL NAME
J±36797
A/T extension assembly
oil seal installer (Inside)
J±3289±20
Holding fixture base
J±29770±A
Pressure gauge
J±24773±1
End play fixture
(Use with J±25022)
J±23907
Slide hammer

7A±96
AUTOMATIC TRANSMISSION (4L30±E)
4L30±E Parts List
Case And Associated Parts
241RY00021
Legend
(1) Torque Converter
(2) Screw, Seal Ring Assembly
(3) Seal Ring Assembly, Converter Housing
(4) Screw, Converter Housing/Main Case
(5) Screw, Converter Housing/Oil Pump
(6) Housing, Converter
(7) Plug, Converter Housing
(8) Seal, O±Ring
(9) Wear Plate, Oil Pump Body
(10) Pump Assembly, Oil
(11) Gasket
(12) Washer, Thrust Selective
(13) Ring, Snap
(14) Cover, 3±4 Accumulator Piston
(15) Seal, O±Ring, 3±4 Accumulator
(16) Spring, 3±4 Accumulator Piston(17) Pin, 3±4 Accumulator Piston
(18) Piston, 3±4 Accumulator
(19) Ring, 3±4, Accumulator Piston
(20) Case, Adapter
(22) Connector, Electrical/Adapter Case
(23) Screw, Pan
(27) Restrictor, Oil
(28) Gasket, Transfer Plate/Adapter
(29) Plate, Transfer Adapter/Center Support
(30) Support Assembly, Center
(31) Screw, Center Support
(32) Ring, Oil Seal
(33) Seal, O±Ring Main Case
(34) Fitting, Cooler
(35) Fitting Assembly, Cooler
(36) Case, Main
(37) Breather, Pipe