ISUZU TF SERIES 2004 Workshop Manual

TRANSFER CASE 7D-33

Main Data and Specifications
General Specifications
Type Synchronized type gears shifting between the 2 and 4 wheel drive mode.
Planetary type gears shifting between “low" and “high".
Control method Remote control with the button switch on the instrument panel for gears
shifting among “2H" , “4H" and “4L".
Gear ratio High; 1.000
Low; 2.482
Oil capacity 1.3 lit. (1.37 U.S. quart)
Type of lubricant BESCO GEAR OIL TRANSAXLE (5W-30)
Refer to chart in Section 0

Torque Specifications
Nm (kgm/lb ft)

RTW47DLF000201

7D-34 TRANSFER CASE

N
m (kg
m/lb ft)


RTW47DLF000401

TRANSFER CASE 7D-35

N
m (kg
m/lb ft)
E07R300008

7D-36 TRANSFER CASE

Special Tools

ILLUSTRATION PART NO.
PART NAME
ILLUSTRATION
PART NO.
PART NAME

5-8840-2786
Transfer case oil seal
installer 5-8840-2784-0

Ring gear installer
5-8840-0084-0

Sliding hammer 5-8840-0133-0
Flange holder
5-8840-0027-0

Rear output shaft needle
bearing replacer 5-8840-2782-0

Needle bearing installer
5-8840-2293-0
Punch; end nut 5-8840-2783-0

Needle bearing installer
5-8840-2788-0

Front output shaft needle
bearing replacer 5-8840-0007-0
Driver handle
5-8840-2785-0
Input shaft and/or front
output shaft oil seal
installer 5-8840-1268-0

Rear output shaft ball
bearing installer

TRANSFER CASE 7D-37

ILLUSTRATION PART NO.
PART NAME
5-8840-2787-0
Snapring installer

7D-38 TRANSFER CASE
MEMO

TRANSFER CONTROL SYSTEM 7D1-1
SECTION 7D1
TRANSFER CONTROL SYSTEM
TABLE OF CONTENTS
PAGE
Service Precaution .................................................................................................... 7D1 - 2
General Description ................................................................................................... 7D1 - 3
System Components ................................................................................................. 7D1 - 5
Parts Location ...................................................................................................... 7D1 - 5
Functions of Switch and Indicator Lamp ................................................................. 7D1 - 11
Parts Location ............................................................................................................ 7D1 - 23
Circuit Diagram .......................................................................................................... 7D1 - 27
Connector List ........................................................................................................... 7D1 - 31
Diagnosis .................................................................................................................... 7D1 - 34
Before determining trouble ................................................................................. 7D1 - 34
Memory erasing procedure ....................................................................................... 7D1 - 40
Diagnosis from symptom .......................................................................................... 7D1 - 41

7D1-2 TRANSFER CONTROL SYSTEM

Service Precaution
WARNING:
THIS VEHICLE HAS A SUPPLEMENTAL RESTRAINT
SYSTEM (SRS). REFER TO THE SRS COMPONENT AND
WIRING LOCATION VIEW IN ORDER TO DETERMINE
WHETHER YOU ARE PERFORMING SERVICE ON OR
NEAR THE SRS COMPONENTS OR THE SRS WIRING.
WHEN YOU ARE PERFORMING SERVICE ON OR NEAR
THE SRS COMPONENTS OR THE SRS WIRING, REFER TO
THE SRS SERVICE INFORMATION. FAILURE TO FOLLOW
WARNINGS COULD RESULT IN POSSIBLE AIR BAG
DEPLOYMENT, PERSONAL INJURY, OR OTHERWISE
UNNEEDED SRS SYSTEM REPAIRS.

CAUTION:
Always use the correct fastener in the proper location.
When you replace a fastener, use ONLY the exact part
number for that application. ISUZU will call out those
fasteners that require a replacement after removal. ISUZU
will also call out the fasteners that require thread lockers
or thread sealant. UNLESS OTHERWISE SPECIFIED, do
not use supplemental coatings (Paints, greases, or other
corrosion inhibitors) on threaded fasteners or fastener
joint interfaces. Generally, such coatings adversely affect
the fastener torque and the joint clamping force, and may
damage the fastener. When you install fasteners, use the
correct tightening sequence and specifications. Following
these instructions can help you avoid damage to parts
and systems.

TRANSFER CONTROL SYSTEM 7D1-3
General Description





RTW47DLF000301

Transfer Position and Drive Mode
Three drive modes can be selected through operation of 4WD switch.

Transfer Position 4WD SWITCH Mode Drive mode
2H RWD Rear wheel drive
HIGH
4H 4WD (HIGH) High-speed mechanical
lock-up four wheel drive
LOW 4L 4WD (LOW) Low-speed mechanical
lock-up four wheel drive
NEUTRAL 2H & 4L (10 Sec) NEUTRAL Towed by other vehicle

7D1-4 TRANSFER CONTROL SYSTEM
Summary of transfer control system
The transfer control system switches between the 2-wheel
drive (2H), 4-wheel drive high-speed (4H), 4-wheel drive low-
speed (4L), and neutral positions electrically when the driver
operate the switches.
This system has following functions.
1. Connection or disconnection of drive force distribution to
the front wheel front shaft (axle shaft) (The drive force
distribution to the front propeller is connected o
r
disconnected with the motor actuator.)
2. Try to repeat the connection or disconnection of the front
wheel drive function as described above.
3. Option: Shift on the fly type only.
Instruction of connection or disconnection of the drive force
transmission between the front wheel axle (axle shaft) and
front wheel
(The motor actuator connects or disconnects the left front
wheel ad front wheel axle (axle shaft).).
4. Shifting of auxiliary transmission gears, connection o
r
disconnection of wheel and engine drive force (4H, 4L,
neutral).
5. Operation of indicator on the instrument panel.
6. Transmission of position signal to other controllers.