2003 SSANGYONG MUSSO wheel

5D2-4 TRANSFER CASE (TOD)FUNCTION DESCRIPTION
TOD System Select Mode (4H and 4L) 4H is the mode when drive normally of which gear ratio is 1:1 and 4L mode distributes power to front and rear wheels 50:50 of which gear ratio is 2.48:1.
TOD System Function (select 4H mode) TOD system controls clutch mechanism to comply with rotation in front and rear propeller shaft and if its difference exceeds the permissible range, corresponding power is distributed into front wheel through EMC (Electro-MagneticClutch). Hall effect sensor signals speed on front and rear propeller shafts going through with TOD control unit.
Transfercase clutch coil is activated by variable current on exceeding difference of speed in front and rear propeller shafts.
Function of 4L Mode When select 4L mode, EMC is locked to apply maximum torque into front and rear propeller shafts. Shift motor rotates also 4L position by rotation of cam thus propeller shaft torque changes from 1:1 to 2.48:1 by planetarygear set.
Shift Motor It locates backside transfer case, which drives rotary helical cam. When mode select switch changes to 4L, shift fork is on position for 2.48:1 by rotation of helical cam.
Transfer Case
TOD transfer case distributes power into front and rear axle by operation of 4H/4L switch and shift motor. Shifting 4H to 4L, is performed towards reducing HI-LO collar by means for connection HI-LO shift fork with
output shaft in order to join with planetary gear. Torque transmits input shaft then sun gear rotating front planetary
gear. Front planetary gear join with output shaft and drives LO position.

TRANSFER CASE (TOD) 5D2-5
Definitions
Rear Speed Sensor A Hall Effect speed sensor which produces a square wave. 0-5Vdc signal inresponse to a rotating 30 tooth wheel coupled to the rear propshaft inside the
Transfer Case. Each rotation of the rear propshaft will result in 30 speed sensor pulse.
Front Speed Sensor A Hall Effect speed sensor which produces a square wave. 0-5Vdc signal in response to a rotating 30 tooth wheel coupled to the front propshaft inside the
Transfer Case. Each rotation of the front propshaft will result in 30 speed sensor pulse.
EMC An Electromagnetic clutch used to control the amount of torque applied to the front propshaft.
TOD TM
Torque on DemandTM
.
Duty Cycle Duty Cycle is the time the EMC is on divided by the period in which it is being modulated.
Touch-off A minimum amount of duty cycle applied to the EMC.
Front OverrunA condition where the front propshaft is turning at a rate which is faster than the rear propshaft.
Rear Overrun A condition where the rear propshaft is turning at a rate which is faster than the
front propshaft.
High Range The highest (numerically lowest = 1 :1) gear ratio between the input and outputsof the Transfer Case.
Low Range The lowest (numerically highest = 2.48:1) gear ratio between the input and outputs
of the Transfer Case.
4H/4L Switch A switch which selects the desired gear ratio.
Shift Motor Electric motor which changes the Transfer Case range.
Position Encoder A set of 4 Gray code switches which provide feedback to the TCCU indicating theposition of the Shift Motor.
Clutch Interlock Switch A switch on vehicles equipped with a manual transmission which indicates that the clutch pedal is depressed.
Neutral Safety Switch A switch on vehicles equipped with an automatic transmission which indicatesthat the transmission is in neutral.
Shift Inhibit Speed The vehicle speed above which Transfer Case shifts are disallowed. Vehicle speedis indicated by propshaft speed measurement.

TRANSFER CASE (TOD) 5D2-11
4. Electric Shift Default ModeIf the motor fails to reach its destination, the TCCU will attempt the following (in order):
a. The TCCU will wait 3 seconds then attempt the shift again.
b. If the second attempt to reach the destination fails the TCCU will wait 3 seconds then attempt to rotate the motor back to the original position. If successful, all future shifts will be inhibited until the Ignition is cycled.
c. If the attempt to return to the original position fails, the TCCU will wait 3 seconds then attempt to rotate the motor to the original position again. If the second attempt to return to the original position is successful, the “4WD CHECK ” lamp will be illuminated, and all future shifts will be inhibited until the Ignition is cycled.
d. If the second attempt to return to the original position fails the motor will be turned off, the “4WD CHECK ” lamp
will be illuminated, and all future shifts will be inhibited until the Ignition is cycled.
TOD TM
System Operation
The TOD TM
System is responsible for distributing torque between the front and rear axles. The TCCU monitors the
propshaft speeds, operating range (High/Low), and ABS activity and then applies a calculated amount of torque tothe front axle by Pulse Width Modulating the current applied to the EMC.
1. Touch-off Torque
The minimum EMC Duty Cycle is based on the vehicle speed and throttle positionThe TCCU receives the TPS signal from the following sources:On vehicles equipped with CAN, the TCCU receives the TPS signal from the CAN bus.
2. When Slip Detection
The TCCU continuously monitors the front and rear propshaft speeds to detect wheel slip.
3. Wheel Slip Control When wheel slip is detected the TCCU controls the EMC duty cycle as necessary until the wheel slip is reduced
below the allowable limit. The EMC Duty Cycle will then be reduced to the Touch-Off value.
4. Brake/ABS Strategy When the ABS System is active, the EMC Duty Cycle is set to a fixed duty cycle (30%) to aid in braking without counteracting the ABS System.
5. 4L Strategy When the system is operating in 4L, the TCCU continues TOD TM
(operation provided that the propshaft speed is
below 175 rpm (5220 pulses/minute)). When the speed increases above 175 rpm, the EMC Duty Cycle is set tothe maximum value (88%) which applies the maximum available torque to the front axle.

5D2-16 TRANSFER CASE (TOD)g. If the shift motor/position encoder assembly failure (other than a motor failure which occurs when the motor isenergized) recovers continuously for one second the TCCU will function normally. The “4WD CHECK ” lamp is
turned off but the fault code will remain in memory.
h. A motor failure (i.e. open or short circuit) which occurs when the motor is energized can only be cleared by cycling the ignition off-on.
3. Front Speed Sensor Test If a Front Speed Sensor fault is detected continuously for 0.5 second the “4WD CHECK ” lamp is illuminated. The
TCCU then responds as follows:
a. If the system is in High Range the TCCU uses the Rear Speed Sensor to determine the EMC Touch Off level and wheel slip control is suspended.
b. If the system is in Low Range, the EMC Duty Cycle is set to maximum (independent of vehicle speed) until the system is shifted out of 4L.
c. All Electric Shift activity is halted until the Ignition is cycled. If a shift is in progress it will be completed.
If the Front Speed Sensor recovers continuously for O.5 second the TCCU will function normally. The “4WD
CHECK ” lamp is turned off but the fault code will remain in memory.
4. Rear Speed Sensor Test If a Rear Speed Sensor fault is detected continuously for 0.5 second the “4WD CHECK ” lamp is illuminated. The
TCCU then responds as follows:
a. If the system is in High Range the TCCU uses the Front Speed Sensor to determine the EMC Touch Off level and wheel slip control is suspended.
b. If the system is in Low Range, the EMC Duty Cycle is set to maximum (independent of vehicle speed) until the system is shifted out of 4L.
c. All Electric Shift activity is halted until the Ignition is cycled. If a shift is in progress it will be completed.
If the Rear Speed Sensor recovers continuously for 0.5 second the TCCU will function normally. The “4WD
CHECK ” lamp is turned off but the fault code will remain in memory.
5. Both Speed Sensor Faulty If both the Front and Rear Speed Sensors are faulty continuously for 0.5 seconds the “4WD CHECK ” lamp is
illuminated. The TCCU then responds as follows:
a. If the system is in High Range the TCCU sets the EMC Touch Off level based on a vehicle speed of 0 and wheel slip control is suspended.
b. If the system is in Low Range, the EMC Duty Cycle is set to maximum until the system is shifted out of 4L.
c. All Electric Shift activity is halted until the Ignition is cycled. If a shift is in progress it will be completed.
If both Speed Sensors recover continuously for 0.5 second the TCCU will function normally. The “4WD CHECK ”
lamp is turned off but the fault code will remain in memory.
6. EMC Test The EMC is tested for open circuit or short circuit to ground. If a fault is detected continuously for 0.8 second the “4WD CHECK ” lamp is turned on and all TOD TM
activity is halted.
If the EMC recovers continuously for 0.8 second the TCCU will function normally. The “4WD CHECK ” lamp is
turned off but the fault code will remain in memory.

5D2-42 TRANSFER CASE (TOD)1 Bearing
2 Bushing
3 Carrier Assembly
4 Sun Gear
5 Thrust Plate
6 Input Shaft
7 Output Shaft Thrust Washer
8 Bearing
9 Retaining Ring
10 Snap Ring
11 High-low Collar
12 Rear Output Shaft
13 Oil Strainer
14 Coupling Hose
15 Hose Clamp
16 Pump Assembly
17 Thrust Washer
18 Sprocket, Drive (24T)
19 Clutch Pack Assembly
20 Insulator Washer
21 Armature
22 Snap Ring
23 Wave Washer
24 Apply Cam
2 5 Ball
26 Cam and Coil Assembly
27 Nut, Metric
28 Output Shaft Yoke Washer
29 Oil Seal
30 Case Flange
31 Bolt
32 Upper Speed Sensor (Rear)
33 Nut
34 Washer
37 Bolt
38 Tag, Identification
39 Thrust Bearing
40 Clutch Coil Assembly
41 Fork, Reduction Shift 42 Shift Rail
43 Shaft, Shift
44 Spacer
45 Torsion Spring
46 Shift Cam
47 Transfer Case Shift Motor
48 Bolt
49 J-clip
50 Connector Retainer
51 Bolt
52 Support Stud
53 Lower Speed Sensor (Front)
54 Plug
55 Identification Decal
56 Cover
57 Tone Wheel, Lower
58 Chain, Drive
59 Sprocket, Driven (24T)
61 Magnet
62 Case
63 Case Flange and Output Shaft
64 Barb, Breather
68 Spiral Pin
69 Oil Seal
70 Pin, Dowel
71 Ring Gear
72 Retaining Ring
73 Snap Ring
74 Bearing
75 Snap Ring
76 Bearing
77 Speedometer Drive Gear
78 Facing, Shift Fork
79 Upper Tone Wheel
80 Oil Seal
81 Bearing Sleeve
82 Bearing

5D2-44 TRANSFER CASE (TOD)
9. Remove the bolts that retain the front case to therear case. Make sure that the front case is facing downward so that the rear cover is facing upwards. Pry on the bosses and separate the front case fromthe rear case. Remove all traces of gasket sealantfrom the mating surfaces of the front case and rearcase.
10. If the speedometer drive gear is to be replaced, first remove the flange seal by prying and pulling thecurved-up lip of the flange seal. Do not damage thebearing, bearing cage or case. Remove and discardthe flange seal. Remove the speedometer drive gearand upper tone wheel.
69 Yoke to Flange Seal
75 Snap Ring
76 Bearing
77 Speedometer Drive Gear
79 Upper Tone Wheel
40 Clutch Coil
40a Clutch Coil Retaining Bolts
40b Wire
11. If the rear output shaft bearing requires replacing, removethe internal snap ring that retains the bearing in the bore. From the outside of the case, drive out the bearing.
12. Remove the three nuts and washers retaining the clutch coil assembly to the rear case. Pull the assembly, alongwith the O-ring and wire, from the case.
13. Remove bearing assembly from output shaft. Remove the clutch housing from the output shaft. Remove the balls and apply cam and wave washer from the output shaft. Remove snap ring from output shaft. Remove clutch pack assembly from output shaft.
25 Ball
26 Cam and Coil Assembly

TRANSFER CASE (TOD) 5D2-49
12. Install the output shaft and oil pump in the input shaft.Make sure that the internal splines of the ouput shaft
engage the internal splines of the high-low shift collar. Make sure that the oil pump retainer arm and oil filter leg are inthe groove and slot of the front case.
13. Install the magnet in the slot in the front case just above the oil filter leg.
14. Install the front output shaft in the front case.
15. Install the thrust washer on the rear output shaft. Install the chain, drive sprocket and driven sprocket as an assembly over the output shaft. Notice
The driven sprocket (on the front output shaft) must
be installed with the marking REAR facing toward the rear case, if so marked.
Drive sprocket has a bushing pressed into it.
16. Install tone wheel onto the front output shaft. Make sure the spline on the tone wheel engages the spline on thefront output shaft.
17. Install clutch pack assembly onto the rear output shaft. Make sure the spline of the clutch pack engages to the spline of the sprocket.
18. Install snap ring onto the rear output shaft. Start the snap
ring over the spline and use the wave spring to seat the snap ring in the snap ring groove. If the snap ring will notinstall, the thrust washer inside the clutch pack may not
be seated properly. 1 2 Rear Output Shaft
1 6 Oil Pump
6 1 Magnet
1 2 Rear Output Shaft
1 3 Oil Strainer
1 6 Oil Pump
1 6 a Pump Retainer

TRANSFER CASE (TOD) 5D2-51
25. Install the pin on the tang end of the helical cam into thehole in the front case. Position the torsion spring tangs so that they are pointing toward the top side of the transfer case and just touching the high-low shift fork. CAUTIONDo not bend the helical cam during installation to the front case because of possible damage to the pin at the tangend of the motor shaft.
26. Install the shift rail through the high-low shift fork and make sure that the reverse gear shift rail is seated in the frontcase bore.
27. Install upper and lower speed sensors into the cover. Feed the coil wire through the upper speed sensor wire shield.
2 8. Install upper tone wheel, speedometer gear and rear output seal. Use Output Shaft Seal Replacer and Driver orequivalent to install seal.
29. Coat the mating surface of the front case with a bead of Black Non-Acid Cure Silicone Rubber or equivalent.
30. The following procedure must be followed prior to installing the rear case onto the front case half:
a. Align the output shaft with the rear case output shaft bore.
b. Align the helical cam with the rear case motor bore. If difficulty is encountered with seating the rear case, tap
the rear output shaft with a sharp blow using a rubber
mallet in a direction away from the triangular shaft whilepushing down on the rear case.
Tightening Torque 25 - 37 Nm
31. Install the bolts retaining the case halves and tighten.