Isuzu KB P190. Manual — part 1176
7B1-98 MANUAL TRANSMISSION
226RS031
9. Install the needle bearing, 1st block ring, 1st outside
ring, 1st inside ring, and 1st gear.
• Apply engine oil to the needle bearing, 1st gear
thrust surfaces and synchronizer ring friction
surfaces.
• The 1st gear dog teeth must be facing the
transmission front side.
226RS053
Legend
(1) 1st
Gear
(2) Needle
Bearing
(3) Inside
Ring
(4) Outside
Ring
(5) Block
Ring
10. Install the 1st gear thrust bearing and the race to the
main shaft.
The thrust bearing side must be facing the
transmission front side.
226RS054
11. Apply engine oil to the mainshaft ball bearing and
the mainshaft.
Install the ball bearing and needle bearing collar to
the mainshaft.
The ball bearing snap ring groove must be facing
the transmission rear side.
Use a bench press and installer 9-8522-1165-0 to
slowly force the collar into place.
226RS055
MANUAL TRANSMISSION 7B1-99
12. Apply engine oil to the needle bearing and the 3rd
gear thrust surfaces.
Install the needle bearing and the 3rd gear to the
mainshaft.
The 3rd gear dog teeth must be facing the
transmission front side.
226RS056
13. Install the 3rd block ring.
14. Check and install the 3rd-4th synchronizer assembly
by using the following steps:
1. Check that the inserts (3) fit snugly into the
clutch hub insert grooves.
2. Check that the insert springs (4) are fitted to the
inserts as shown in the illustration.
3. Check that the clutch hub (5) and the sleeve (6)
slide smoothly.
4. Install the synchronizer assembly to the
mainshaft.
The clutch hub face with the heavy boss must be
facing the 3rd gear side.
226RS049
226RW221
15. Select and install mainshaft snap ring using the
following instructions:
Select the snap ring which will provide the minimum
clearance between the 3rd-4th clutch hub and the
snap ring.
226RS058
There are three snap ring sizes available.
The snap rings are color-coded to indicate their
thickness, as shown in the figure.
7B1-100 MANUAL TRANSMISSION
226RS021
Clutch Hub and Snap Ring Clearance
Standard: 0 - 0.1 mm (0 - 0.004 in)
Snap Ring Availability
Thickness Color
Coding
1.80 mm (0.071 in)
White
1.85 mm (0.073 in)
Yellow
1.90 mm (0.075 in)
Blue
• Use a pair of snap ring pliers to install the snap
ring to the mainshaft.
The snap ring must be fully inserted into the
mainshaft snap ring groove.
16. Install the top block ring.
Apply grease to the needle bearing inner and outer
circumferences and install the needle bearing in the
top gear shaft.
17. Use a bench press to install the top gear shaft ball
bearing to the top gear shaft.
226RS059
The snap ring groove of the ball bearing must be
facing the transmission front side.
18. Use a pair of snap ring pliers to install the top gear
shaft snap ring to the top gear shaft.
MANUAL TRANSMISSION 7B1-101
Main Data and Specifications
General Specifications
MUA5G
MUA5H
MUA5S
Transmission type
Fully synchronized forward and reverse gears
Control method
Remote control with the gear shift lever on the floor.
Gear ratio: Transmission
1st
4.008
4.008
4.357
2nd
2.301 2.301 2.502
3rd
1.427 1.427 1.501
4th
1.000 1.000 1.000
5th
0.828 0.744 0.809
Rev.
3.651 3.651 3.970
Transmission oil capacity
2.95 lit. (3.12 US qt)
Type of lubricant
Engine oil: Refer to the chart in "SECTION 0"
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