2007 ISUZU KB P190 clock

7A1-36 CONSTRUCTION AND FUNCTION
GEAR TRAIN (TRANSMISSION MECHANISM) OPERATION AND
HYDRAULIC CIRCUIT
CONSTRUCTION AND OPERATION
The JR405E consists of two sets of planetary gears, three multiple plate clutches, two multiple plate brakes
and one one-way clutch.





COMPONENT NAME AND FUNCTION
Component Name Symbol Function
Low Clutch L/C Connects the front planetary carrier to the rear
internal gear.
Engaged at 1st, 2nd and 3rd gear.
High Clutch H/C Connects the input shaft to the front planetary
carrier.
Engaged at 3rd and 4th (O/D) gear.
Reverse Clutch R/C Connects the input shaft to the front sun gear.
Engaged at Reverse gear.
Low & Reverse Brake L&R/B Locks the front planetary carrier.
Engaged at L position and Reverse gear.
2-4 Brake 2-4/B Locks the front sun gear.
Engaged at 2nd and 4th (O/D) gear.
Low One-way Clutch L/O.C Allows the front planetary carrier to turn forward
(clockwise) but locks to opposite direction
(counterclockwise).
Operative when accelerating.
Low Clutch Solenoid L/C.S Regulates low clutch pressure.
High Clutch Solenoid H/C.S Regulates high clutch pressure.
Low & Reverse Brake Solenoid L&R/B.S Regulates low & reverse brake pressure.
2-4 Brake Solenoid 2-4/B.S Regulates 2-4 brake pressure.
Lock-up Solenoid L/U.S Regulates lock-up clutch pressure.
High Clutch Oil Pressure SW H/C.P/SW Detects high clutch supply oil pressure.
Low & Reverse Brake Oil Pressure SW L&R/B.P/SWDetects low & reverse brake supply oil pressure.
2-4 Brake Oil Pressure SW 2-4/B.P/SWDetects 2-4 brake supply oil pressure.

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ISUZU KB P190 2007

7A1-40 CONSTRUCTION AND FUNCTION
Reverse Gear in Position
The driving force from the input shaft is transmitted to the rear sun gear and reverse & high clutch drum. In the R
position, the reverse clutch is engaged and the driving force is transmitted to the front sun gear and rotates it
clockwise. The low & reverse brake is also engaged and the front planetary carrier is fixed so that the front pinion
gear does not rotate clockwise, but can rotate counterclockwise. As a result, the output shaft rotates
counterclockwise and the vehicle goes backwards.







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CONSTRUCTION AND FUNCTION 7A1-41
1st Gear in D, 3, 2 Position
The driving force from the input shaft is transmitted to the rear sun gear and reverse & high clutch drum. As
the low clutch is engaged, the movement of the rear internal gear is restricted. Since the low one-way clutch
acts at the same time, counterclockwise rotations of the rear internal gear are locked. As a result, the driving
force transmitted to the rear sun gear rotates the rear planetary carrier clockwise, then the rotation speed is
decreased and multiple force is transmitted to the output shaft.
When decelerating, the rotating speed of the rear planetary carrier (rear pinion gear) is higher than that of the
rear sun gear and the rear internal gear attempts to rotate clockwise. At this time, the low one-way clutch
does not act but races, and therefore the rear internal gear rotates clockwise. The reverse torque from the
driving shaft is not transmitted to the engine side and the engine brake does not act.










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ISUZU KB P190 2007

CONSTRUCTION AND FUNCTION 7A1-43
2nd Gear in D, 3, 2 Position
The driving force from the input shaft is transmitted to the rear sun gear and reverse & high clutch drum. As
in the case of the 1st gear, the low clutch is engaged and the movement of the rear internal gear is restricted.
Since the 2-4 brake is engaged, the front sun gear is fixed. As a result, movement of the rear internal gear is
restricted, and the driving force transmitted to the rear sun gear rotates the rear planetary carrier clockwise.
The rotating speed of the rear planetary carrier is higher than in 1st gear as the rear internal gear rotates.
When decelerating, the engine brake is applied.








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CONSTRUCTION AND FUNCTION 7A1-45
4th Gear (O/D) in D Position
The driving force from the input shaft is transmitted to the rear sun gear and reverse & high clutch drum.
Since the 2-4 brake is engaged, the front sun gear is fixed. In addition to this the high clutch is engaged. As
a result, the front pinion gear rotates itself together with other gears clockwise. This rotation increases the
speed of rotation of the front internal gear and is transmitted to the output shaft.





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ISUZU KB P190 2007

TRANSMISSION CONTROL SYSTEM (JR405E) 7A2-147
Low One-way Clutch
Legend1. Sprag
2. Rotating direction
The low one-way clutch employs the sprag, which locks
the counterclockwise rotation of the front planetary
carrier and the rear internal gear. The one-way clutch
outer race is fitted with the low clutch drum, and the
inner race is fitted with the transmission case. The
outer race rotates freely clockwise, but, when it
attempts to rotate counterclockwise, the sprag locks
the outer race. When the vehicle is traveling in 1st gear
in the D, 3 or 2 position, the low one-way clutch locks
the rear internal gear via the low clutch. It is left free in
the 2nd, 3rd or 4th gear. Parking Function
Legend
1. Parking pawl
2. Parking pawl shaft
3. Pawl return spring
4. Parking actuator support
5. Manual plate
6. Parking cam
7. Parking gear
8. Parking rod
By setting the selector lever to the P range, the parking
pawl is engaged with the parking gear and fixes the
output shaft. By moving the selector lever, the manual
shaft on the right side of the transmission is moved.
The manual plate and parking rod in the transmission is
interlocked with the manual shaft. When the manual
shaft moves, the parking rod end pushes up the parking
pawl. The parking pawl is engaged with the parking
gear when pushed up, and fixes the output shaft. When
the parking is disengaged, it returns to the original
position via the force of the return spring.

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ISUZU KB P190 2007

TRANSMISSION CONTROL SYSTEM (JR405E) 7A2-161
Transmission Power Flow Description
Legend1. Input shaft
2. Front planetary carrier
3. Front pinion gear
4. Front sun gear
5. Rear sun gear
6. Rear pinion gear
7. Rear internal gear
8. Output shaft
9. Reverse clutch 10. 2-4 brake
11. High clutch
12. Front internal gear
13. Rear planetary carrier
14. Low clutch
15. Low & reverse brake
16. Low one-way clutch
17. Parking pawl
Construction Parts
The JR405E consists of two sets of planetary gears,
three multiple plate clutches, two multiple plate brakes
and one one-way clutch.
High Clutch
High clutch (11) connects the input shaft (1) to the front
planetary carrier (2). It is engaged at 3rd and 4th gear.
Low Clutch
Low clutch (14) connects the front planetary carrier (2)
to the rear internal gear (7). It is engaged at 1st, 2nd
and 3rd gear.
Reverse Clutch
Reverse clutch (9) connects the input shaft (1) to the
front sun gear (4). It is engaged at reverse gear.
Low One-way Clutch
Low one-way clutch (16) allows the front planetary
carrier (2) to turn forward (clockwise) but locks to
opposite direction (counterclockwise). It is operative
when accelerating.
Low & Reverse Brake
Low & reverse brake (15) locks the front planetary
carrier (2). It is engaged in L range and reverse gear. 2-4 Brake
2-4 brake (10) locks the front sun gear (4). It is
engaged at 2nd and 4th (O/D) gear.

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ISUZU KB P190 2007

7A2-164 TRANSMISSION CONTROL SYSTEM (JR405E)
Reverse Gear
Legend1. Input shaft
2. Front planetary carrier
3. Front pinion gear
4. Front sun gear
5. Rear sun gear
6. Rear pinion gear
7. Rear internal gear
8. Output shaft
9. Reverse clutch 10. 2-4 brake
11 . H i g h c l u t c h
12. Front internal gear
13. Rear planetary carrier
14. Low clutch
15. Low & reverse brake
16. Low one-way clutch
17. Parking pawl
The driving force from the input shaft (1) is transmitted
to the rear sun gear (5) and reverse & high clutch drum.
In the R range, the reverse clutch (9) is engaged and
the driving force is transmitted to the front sun gear (4)
and rotates it clockwise. The low & reverse brake (15)
is also engaged and the front planetary carrier (2) is
fixed so that the front pinion gear (3) does not rotate
clockwise, but can rotate counterclockwise. As a result,
the output shaft (8) rotates counterclockwise and the
vehicle goes backwards.

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ISUZU KB P190 2007