piston ISUZU TF SERIES 2004 Workshop Manual

DIAGNOSIS (JR405E) 7A2-145

5. R range test.
1) Shift into the R range and while starting at full throttle,
check for slipping.
6.P range test.
1) Stop the vehicle on a grade and after shifting into the P
range, release the parking brake. Then check to see tha
t
the parking lock pawl holds the vehicle in place.


Select
Lever
Position
Gear
Position
Gear
Shift
P










R Reverse





N










D 1st
2nd
3rd
4th
3 1st
2nd
3rd
4th(*1)
2 1st
2nd
3rd(*1)
4th(*1)
L 1st
2nd(*1)
3rd(*1)
4th(*1)
Evaluation
1. If there is no 1 to 2 up-shift.

2-4 brake malfunction.

2-4 brake hydraulic circuit failed.

2-4 brake duty solenoid stick.
Refer to symptom diagnosis "No. D1: Faulty Gea
r
Shifting" or DTC section "Gear Ratio Error".

2. If there is no 2 to 3 up-shift.

High clutch malfunction.

High clutch hydraulic circuit failed.

High clutch duty solenoid stick.
Refer to symptom diagnosis "No. D1: Faulty Gea
r
Shifting" or DTC section "Gear Ratio Error".

3. If there is no 2 to 4 (O/D) up-shift.

2-4 brake malfunction.

2-4 brake hydraulic circuit failed.

2-4 brake duty solenoid stick.
Refer to symptom diagnosis "No. D1: Faulty Gea
r
Shifting" or DTC section "Gear Ratio Error".

4. If there is no lock-up in 2, 3 and 4.

Lock-up piston malfunction.

Lock-up hydraulic circuit failed.

Lock-up duty solenoid stick.
Refer to symptom diagnosis "No. I1: No Lock-up"o
r
DTC section "Lock-up Duty Solenoid Failure".


*1: Transmission is shifted at high speed to
prevent engine over-run.

7A4-10 UNIT REPAIR (JR405E)

39ASSY006



Remove the bearing and the low one-way clutch inner
race from the transmission case.

Remove the bearing from the low one-way clutch inne
r
race.


40ASSY005

21.Low and reverse brake return spring
Remove the low and reverse brake return spring from the
transmission case.


41L&R02

22.Low and reverse brake piston

Force compressed air (329kPa/4.0kg/cm
2) through the
transmission case oil passages.


42ASSY004



Remove the low and reverse brake piston from the
transmission case.

7A4-32 UNIT REPAIR (JR405E)
CLUTCH PACK (REVERSE AND
HIGH CLUTCH ASSEMBLY)

01R&H17
Legend
1. Reverse and high clutch drum
2. Seal ring (reverse clutch)
3. Lip seal (reverse clutch)
4. Reverse clutch piston
5. Seal ring (small, high clutch)
6. Seal ring (large, high clutch)
7. High clutch piston
8. Return spring
9. High clutch cover
10. Snap ring


11. Dish plate (high clutch)
12. Driven plates (5, high clutch)
13. Drive plates (5, high clutch)
14. Retaining plate (high clutch)
15. Snap ring (high clutch)
16. Dish plate (reverse clutch)
17. Driven plates (2, reverse clutch)
18. Drive plates (2, reverse clutch)
19. Retaining plate (reverse clutch)
20. Snap ring (reverse clutch)


02R&H18

Disassembly steps
1. Snap ring
Remove the reverse clutch snap ring.

7A4-34 UNIT REPAIR (JR405E)

08R&H36

8. High clutch piston
9. Reverse clutch piston
Install the reverse and high clutch drum to the oil pump.

Force compressed air into the oil pump oil channels.

Remove the high clutch piston and the reverse clutch
piston.


09R&H37



12R&H39

10.Seal ring (high clutch)
Remove the 2 seal rings from the high clutch piston.

13R&H38

11.Seal ring (reverse clutch)
Remove the 2 seal rings from the reverse clutch piston.




Inspection
Drive plate

Measure the drive plate facing thickness at 3 points.

Calculate the average value.
If the average value is less than the specified limit, the
drive plate must be replaced.
Drive plate facing thickness:
Standard – 2.0 mm (0.079 in)
Limit – 1.8 mm (0.071 in)

UNIT REPAIR (JR405E) 7A4-35
Return spring
Check the number of effective return spring coils.
If the number is less than the specified minimum, the
return spring must be replaced.
Effective return spring coils (standard): 10.2

Measure the return spring outside diameter, free length,
and linear diameter.
If any of the measured values exceed the specified limit,
the return spring must be replaced.
Return spring measurements (standard):
Outside diameter – 8.0 mm (0.315 in)
Free length – 27.1 mm (1.067 in)
Linear diameter – 1.1 mm (0.043 in)


10R&H40

Reverse clutch piston

Apply compressed air (392 kPa/4.0 kg/cm
2) to the
reverse clutch piston from the outside to the inside.
The flow of air should be blocked.


11R&H44



Apply compressed air (392 kPa/4.0 kg/cm2) to the
reverse clutch piston from inside to the outside.
The flow of air should be unrestricted.


12R&H39

Reassembly steps
Coat the parts with ATF before installing them.
1. Seal ring (high clutch)
Install new seal rings to the high clutch piston.

7A4-36 UNIT REPAIR (JR405E)

13R&H38

2. Seal ring (reverse clutch)
Install new seal rings to the reverse clutch piston.




RTW47ASH000601
As shown in a figure, oil seal lip is attached.

14R&H32

3. Reverse clutch piston
Install the reverse clutch piston to the reverse and high
clutch drum.


15R&H31

4. High clutch piston
Install the high clutch piston to the reverse clutch piston.


16R&H33

5. Return spring
Install the return spring to the high clutch piston.

UNIT REPAIR (JR405E) 7A4-37

17R&H30

6. High clutch cover

Carefully center the high clutch cover and install it.
NOTE:
If the clutch cover is not centered, the cover outside seal
gum will be forced into the piston area where it will be
damaged.


18R&H27

7. Snap ring

Install the spring compressor to the reverse and high
clutch drum.

Use the spring compressor to carefully force the high
clutch cover down.
Spring compressor: 5-8840-2767-0
NOTE:
To avoid damage to return springs, use only as much
force as is required to press the high clutch cover into
place.

19R&H28



Install the new snap ring to the reverse and high clutch
drum.

20R&H25

8. Dish plate, drive plates, driven plates, and retaining
plate
Install the high clutch dish plate (1), the 5 driven plates (2),
the 5 drive plates (3), and retaining plate (4).






RTW47ASH000501

9. Snap ring
Install the snap ring.

NOTE:
It is careful in the attachment direction of dish plate (1).

UNIT REPAIR (JR405E) 7A4-41

CARRIER AND LOW CLUTCH
ASSEMBLY

01C&L12
Legend
1. Snap ring
2. Front carrier
3. Bearing (with bearing race)
4. Rear sun gear
5. Bearing
6. Rear carrier
7. Bearing race
8. Bearing
9. Rear internal gear
10. Bearing race
11. Snap ring
12. Retaining plate
13. Drive plates (7, low clutch)
14. Driven plates (6, low clutch)


15. Driven plate (1, 2 mm thick, low clutch)
16. Dish plate
17. Snap ring
18. Cancel cover
19. Return spring
20. Low clutch piston
21. Seal ring (small)
22. Seal ring (large)
23. Low clutch drum
24. Bearing
25. Snap ring
26. Low one-way clutch
27. Side plate
28. Snap ring

UNIT REPAIR (JR405E) 7A4-45

30C&L-SUB21

15.Return spring
Remove the return spring.


15C&L-SUB38

16.Low clutch piston

Insert the low one-way clutch inner race to the low clutch
drum.

Force compressed air through the oil passages of the
low one-way clutch inner race to remove the low clutch
piston.


29C&L-SUB22



16C&L-SUB25

17.Snap ring

Raise the low one-way clutch side.

Remove the low one-way clutch snap ring.


17C&L-SUB27

18.Side plate
Remove the side plate.

7A4-48 UNIT REPAIR (JR405E)

25C&L-SUB27

4. Side plate
Install the side plate.


26C&L-SUB26

5. Snap ring
Install the snap ring to the low clutch drum.


27C&L-SUB58



Attach the low one-way clutch inner race to the low
clutch drum in the opposite direction of normal position.

Rotate the one-way clutch inner race clockwise. I
t
should turn smoothly with little resistance.

Rotate the low one-way clutch inner race
counterclockwise.
It should immediately lock (rotation is impossible).
If it does not, check the low one-way clutch installation
direction.
Inspect and replace the low one-way clutch if required.

Remove the low one-way clutch inner race.

Reverse the low clutch drum.


28C&L-SUB32

6. Low clutch piston

Install new seal rings to the low clutch piston.