Isuzu N-Series. Service manual — part 972
7B-124 Automatic Transmission (Smoother)
13. Use pliers to remove the spring pin and select
lever.
14. Remove the select external lever oil seal (26), shift
lever shaft oil seal A (27), and shift lever shaft oil
seal B (28) from the gearshift control box.
15. Inspect each disassembled part for wear, damage,
or other defects. Replace or repair as required if
any abnormality is discovered.
16. Inspect the shift lever shaft for wear, looseness
with the control box, and operation for lack of
smooth operation. Replace if any abnormality is
discovered.
17. Inspect the select solenoid, 2-4-6-R shift solenoid,
and 1-3-5 shift solenoid rods to ensure they slide
smoothly without sticking. Replace if any
abnormality is discovered.
Assembly
1. Use an installer (5-8840-2827-0) to install the shift
lever shaft oil seal B on the control box.
• Coat the outer circumference of the oil seal with
engine oil.
2. Use an installer (5-8840-2245-0) to install the shift
lever shaft oil seal A on the gearshift control box.
• Coat the outer circumference of the oil seal with
engine oil.
3. Use an installer (5-8840-2245-0) to install the
select external lever oil seal on the gearshift control
box.
• Coat the outer circumference of the oil seal with
engine oil.
N7A1272E
N7A1273E
N7A1274E
N7A1275E
Automatic Transmission (Smoother) 7B-125
4. Install the select lever, using a hammer to drive a
new spring pin.
5. Assemble the spring (19), spring seat (20), spring
(21), spring seat (22), spring (23), internal lever
(24), and stopper ring (25) in the gearshift control
box, and insert the shift lever shaft (18) so it is
aligned with the internal lever alignment mark.
• Apply GL-5 oil to the sliding part of the shift
lever shaft.
6. Use a hammer to drive a new spring pin; stopper
ring and spring pin; shift lever shaft.
N7A1276E
N7A1272E
N7A1271E
N7A1270E
N7A1269E
7B-126 Automatic Transmission (Smoother)
7. With the groove of the relay lever shaft facing
upwards, use a hammer to drive it into the gearshift
control box.
• Apply Unimax R No. 2 grease or equivalent to
the shaft.
8. Install the lever bushing (14) on the relay lever.
9. Insert the relay lever (15) in the shaft.
10. Install the select external lever and washer (13)
and select internal lever (16). Use a hammer to
drive a new spring pin (17).
• Apply GL-5 oil to the shaft of the select external
lever.
• Apply Unimax R No. 2 grease or equivalent to
the joint of the select external lever and the
relay lever.
11. Install the 2-4-6-R shift solenoid, 1-3-5 shift
solenoid, select solenoid O-rings (6), and joints (8).
a. Install the joints, using a hammer to drive new
spring pins (7).
Caution:
When driving spring pins, secure the solenoid in order to
avoid distortion of the shafts.
b. Install the O-rings in the solenoids.
12. Install the select solenoid (5).
• Apply sufficient amount of Unimax R No. 2
grease or equivalent to the joint hole.
Tighten:
44 N
⋅m (4.5 kg⋅m / 32.5 lb⋅ft)
13. Apply Three Bond TB1215 to the mating surface of
the control box cover, and install the cover (9).
Tighten:
6 N
⋅m (0.6 kg⋅m / 4.4 lb⋅ft)
14. Install the 2-4-6-R shift solenoid (11) and 1-3-5
shift solenoid (12).
• Apply sufficient amount of Unimax R No. 2
grease or equivalent to the joint hole.
• During installation, check the stud hole
position.
Tighten:
44 N
⋅m (4.5 kg⋅m / 32.5 lb⋅ft)
15. Install the plate (10).
a. Apply Three Bond TB1215 to the mating
surface of the control box plate, and install the
plate.
Tighten:
6 N
⋅m (0.6 kg⋅m / 4.4 lb⋅ft)
b. Install the select solenoid, 2-4-6-R shift
solenoid, and 1-3-5 shift solenoid connectors
on the plate.
16. Install the gear shift position sensor (4), gear select
position sensor, and O-rings (3).
a. Insert the sensors while aligning the angle of
sensor shaft tip with the groove in connection.
Rotate the sensor to align with the installation
bolt hole.
b. Secure the sensors with bolts.
Tighten:
6 N
⋅m (0.6 kg⋅m / 4.4 lb⋅ft)
Caution:
Take care to install the gear shift position sensor and
gear select position sensor correctly.
N7A1267E
N7A1266E
Automatic Transmission (Smoother) 7B-127
17. Apply Loctite 262 or Three Bond TB1386, and then
install the breather pipe, breather hose, and clip
(2).
18. Install the neutral switch (1).
• Carefully remove any sealant remaining on the
threads, and then apply Loctite 242 to the
threads.
Tighten:
34 N
⋅m (3.5 kg⋅m / 25.1 lb⋅ft)
Specifications
Smoother
N7A1265E
Power
Transmission
System
Fluid Coupling (With Lock up Clutch) and Gearshift Clutch
Oil Pump
Trochoid-Type Oil Pump
Oil
Besco ATF III
Oil Capacity
Smoother 6.1L
Oil Cooler
0.6L
Total
6.7L
Cooling Method
Radiator-assisted Cooling (Coolant)
Transmission Type
MYY5T
MYY6P
Transmission
1st
5.315
5.979
2nd
3.053
3.434
3rd
1.655
1.862
4th
1.000
1.297
5th
0.721
1.000
6th
—
0.774
Reverse
5.068
5.701
Oil Capacity
Standard
2.8L
3.5L
With Side PTO
3.1L
3.8L
Oil
Besco 5W-30 Gear Oil Transaxle
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