Page 4705 of 6020

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 assembl
y
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
226RW 221
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 thei
r
thickness, as shown in the figure.
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Page 4706 of 6020
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) W hite
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 oute
r
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 gea
r
shaft snap ring to the top gear shaft.
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Page 4707 of 6020
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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Page 4708 of 6020
7B1-102 MANUAL TRANSMISSION
Torque Specifications
N⋅
⋅⋅
⋅
m (kgf ⋅
⋅⋅
⋅
m/lb ⋅
⋅⋅
⋅
ft)
RTW 77BLF003801
About arrow mark, refer to Transmission (MUA) Installation in this section.
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Page 4709 of 6020
MANUAL TRANSMISSION 7B1-103
Torque Specifications (Cont'd)
N⋅
⋅⋅
⋅
m (kgf ⋅
⋅⋅
⋅
m/lb ⋅
⋅⋅
⋅
ft)
RTW 77BLF003901
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ISUZU KB P190 2007
Page 4710 of 6020
7B1-104 MANUAL TRANSMISSION
Torque Specifications (Cont'd)
N⋅
⋅⋅
⋅
m (kgf ⋅
⋅⋅
⋅
m/lb ⋅
⋅⋅
⋅
ft)
RTW 57BLF000301
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Page 4711 of 6020
MANUAL TRANSMISSION 7B1-105
TROUBLESHOOTING
1. ABNORMAL NOISE
1) NOISY IN NEUTRAL
Checkpoint Trouble Cause Countermeasure
Replenish or replace the gear
oilInsufficient or improper gear
oil
NG
Mainshaft splines
Synchronizer clutch hub
splinesReplace the main shaft and
the synchronizer clutch hub
Replace the gear(s)
Replace the flywheel pilot
W orn splines
W orn or scuffed gear tooth
contact surfaces
Flywheel pilot bearingW orn flywheel pilot bearing
Bearings (Mainshaft,
countershaft, and transfer
shaft)
Gears (Mainshaft,
countershaft, reverse idler
gear and transfer gears)
Replace the bearing(s)W orn or broken bearing(s)
OK NG
NG
NG
NG
OK
OK
OK
Gear oil
TransmissionRealign the transmissionTransmission misalignment
OK
NG
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ISUZU KB P190 2007
Page 4712 of 6020
7B1-106 MANUAL TRANSMISSION
2) NOISY OPERATION
Checkpoint Trouble Cause Countermeasure
Replenish or replace the gear
oilInsufficient or improper engine
oil
NG
Replace the gear(s)
Replace the gear(s)
Replace the bearing(s)
Gears (Gear whining)Lack of backlash between
meshing gears
Free running gears seizing on
the thrust face or the inner
face
Bearings (Hissing, thumping
or bumping)W orn or broken bearing(s)
Gears (Squealing at high
speeds)
Replace the gear(s)Gears (Growling, humming, or
grinding)W orn, chipped, or cracked
gear(s)
NG
NG
NG
NG
OK
OK
OK
OK
Gear oil (Metallic rattling)
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ISUZU KB P190 2007