Great Wall hover, Service Manual

Page: 125 / 425

Automatic transmission-49
The distribution of FAQ table is shown as follows:
Table 6.2.1 Drive failure Table 6.2.3 Shift quality failure
Table 6.2.2 Shift mode failure Table 6.2.4 Disassembly failure
failure Possible reason Corresponding measure
“D”-Gear operation
has not drive
The automatic transmission fluid is insufficient.
The oil-entering of C1/C2 piston is blocked.
The “Z” is assembled incorrectly.
The primary regulating valve plug is opened.
The overspeed shaft or input shaft sealing ring is
failure.
3
→
4, 1
→
2 single-way clutch is installed in reverse or
failure.
Check the liquid level. Fill it up if necessary.
Check and wash the C1/C2 oil inlet device.
Reinstall the “Z” connection.
Remove, wash and reinstall the primary
regulating valve.
Check and replace it if necessary.
Check and replace it if necessary.
The reverse shifting
operation is without
drive.
The manual 1
st
-Gear
has not engine
brake.
The engine brake is
normal in manual
1
st
-Gear.
The input shaft oil seal ring is damaged.
The rear brake belt or servo system is faulty.
C3, C3 wheel shaft or C1/C2 cylinder are out of work.
Check and replace it if necessary.
Test the servo system or replace the rear brake
belt according to the requirement.
Test the failure C3, C3 wheel axle or C1/C2
cylinder.
Repair it in time if necessary.
“D” –Gear and reverse
–Gear operation is
without drive.
The primary regulating valve is blocked.
The pump gear is damaged.
Take out the output shaft clasp.
Detect and clean the primary regulating valve.
Check and replace the pump gear if necessary.
Check and repair it if necessary.
Only can 2
→
3 shifting
(can not realize the
4
th
-Gear and 1
st
-Gear)
S1 is closed always.
Test the S1. Repair or replace it if necessary.
Test the failure of S1 12V power supply
voltage or wire bundle.
Only can 1
→
4 shifting
1
→
3
→
4 shifting (1
→
2 shifting delay).
S1 is opened always
Test the S1. Repair or replace it if necessary.
Test the failure of S1 12V power supply
voltage or wire bundle.
Only can 4
→
3 shifting
S2 is closed always. Test the S2. Repair or replace it if necessary.
Test the failure of circuit break or wire bundle.
1
→
2
→
neutral position
shifting (1
st
-Gear
transition)
S2 is opened always
Test the S2. Repair or replace it if necessary.
Test the failure of circuit break or wire bundle.
Only can 1
→
3 shifting
B1 is out of work
The brake belt is loose.
The front servo piston or oil seal is out of work.
S1/S2 ball spool is reinstalled in wrong place.
Test and adjust it according to the requirement.
Test and maintain it according to the
requirement.
Test and replace or reinstall it according
to the requirement.
Only can 1
→
3
→
4
shifting
The small O-ring of front servo piston is invalid or
lost.
2
→
3 Gear position shifting valve is blocked.
Detect the O-ring. Process the replacement or
reinstallation if necessary. Detect the 2
→
3
Gear shifting valve; Process the maintenance
or replacement according to the requirement.
Only can 1
→
2
→
1
shifting
C1 is invalid or 3
rd
-Gear and 4
th
-Gear is loose. (give
to 1
st
-Gear in 3
rd
-gear; give to 2
nd
-Gear in 4
th
-Gear)
Detect the clutch C1. Repair or replace it if
necessary.
Can not realize the
manual 4
→
3, 3
→
2, 2
→
1
Overspeed clutch /ball spool has displacement.
C4 is invalid.
Detect the ball spool. Process the replacement
or reinstallation according to the requirement.
Detect the C4. Repair C4 or replace the C4
wave pan according to the necessary.