Defender 90 NAS. Manual — part 38
44
AUTOMATIC GEARBOX
2
FAULT DIAGNOSIS
ROAD TEST PROCEDURE
Follow the procedure given commencing each test,
from a standing start, on a level road, in good weather
conditions.
ROADTEST 1 = CHECKS 1-2-3-4-5-6-7-8
D SELECTED KICKDOWN START FROM REST
CHECK 1
Check for clutch squeal and slip. Check pressure is
150lbf/in
2
CHECK 2
Check 1st to 2nd upshift speed and quality. Pressure
should fall to 120 lbf/in
2
.
CHECK 3
Check 2nd to 3rd upshift speed and quality. Pressure
should fall to 100 lbf/in
2
CHECK 4
Release throttle to allow simultaneous engagement
4th + DDC. Check shift quality and engine rpm drop of
approximately 500 rpm.
CHECK 5
To proceed to Check 5, release throttle and check
drop out speed of direct drive clutch to 4th.
CHECK 6
Check down shift speed and quality 4th to 3rd.
NOTE: This shift is usually very smooth
and difficult to detect.
CHECK 7
Check downshift speed and quality 3rd to 2nd.
CHECK 8
Check downshift speed and quality 2nd to 1st. Also
difficult to detect.
ROADTEST 2 = CHECKS 9-10-11
D SELECTED FROM REST
FULL THROTTLE START
CHECK 9
Check 1st to 2nd upshift speed and quality.
CHECK 10
Check 2nd to 3rd upshift speed and quality.
CHECK 11
Check 3rd, 4th and direct drive clutch upshift speed
and quality.
NOTE: 4th and the direct drive clutch
engage simultaneously.
AUTOMATIC GEARBOX
3
FAULT DIAGNOSIS
ROADTEST 3 = CHECKS
12-13-14-15-16-17-18-19-20-21-22-23
D SELECTED FROM REST
LIGHT THROTTLE START
CHECK 12
Check 1st to 2nd upshift speed and quality.
CHECK 13
Check 2nd to 3rd upshift speed and quality.
CHECK 14
Check 3rd to 4th upshift speed and quality.
NOTE: This shift is usually very difficult to
detect but can be confirmed by a 200 rpm
drop in engine speed.
CHECK 15
Check speed and quality of shift into direct drive
clutch, confirmed by 300 rpm drop in engine speed.
NOTE: An intermediate throttle position
engagement of 4th and the direct drive
clutch, which is indicated by a fall of 500
rpm in engine speed.
CHECK 16
At approximately 88 kph, 55 mph depress throttle to
kickdown - gearbox should change down to 2nd -
release throttle to re-engage 4th direct drive clutch
continue to accelerate gently.
CHECK 17
At approximately 128 kph, 80 mph depress throttle to
kickdown - gearbox should change down to 3rd -
release throttle to re-engage 4th direct drive clutch
and continue to accelerate gently.
CHECK 18
At approximately 138 kph, 85 mph select 3rd, gearbox
should change immediately down to 3rd. Release
throttle.
CHECK 19
De-accelerate to approximately 47 kph, 30 mph
depress throttle to kickdown - geabox should
downshift to 1st gear, continue accelerating at full
throttle until 3rd gear is attained. To do this you will
have repeated check 2 of Test 1.
CHECK 20
At 128 kph, 80 mph select 2nd no downshift should
occur. Release throttle.
CHECK 21
At 104 kph, 65 mph an automatic downshift into 2nd
gear should occur. Continue to de-accelerate.
CHECK 22
At 88 kph, 55 mph select 1st. No downshift should
occur. Continue to de-accelerate.
CHECK 23
With 1 selected 2nd gear engaged, continue to
de-accelerate and at 45 kph, 28 mph the box should
automatically downshift to 1st gear after which no
upshifts will occur in this selector position.
END OF ROADTEST
44
AUTOMATIC GEARBOX
4
FAULT DIAGNOSIS
AUTOMATIC GEARBOX ASSEMBLY
1. Gearbox assembly
2. Inhibitor switch assembly
3. Control unit assembly
4. Filter and sump assembly
AUTOMATIC GEARBOX
5
FAULT DIAGNOSIS
1. Torque converter housing assembly
2. Gearbox pump and casing assembly
3. Governor and adaptor housing assembly
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