Page 33 of 484
MT-14GearboxDisassembly of Gear Box
17. Tear down the reverse shift fork axle, reverse rocker
arm, reverse toggle lever and toggle block
(a) Tap out the spring pin with the nail punch and hammer.
(b) Take out the interlocking ball and interlocking guidepost
between the reverse shift fork axle and the five-speed
gearshift fork axle.
(c) Tear down the reverse shift fork axle, and
(d) Tear down the reverse rocker arm and yoke block.
18. Tear down the first-second-speed gearshift fork axle.
(a) Take out the interlock pin and interlock guide post between
the reverse shift fork axle and the five-speed gearshift fork
axle.
(b) Dismantle the locating bolts of the toggle fork of the first-
second-speed gearshift toggle fork.
(c) Dismantle the fork axis of the first-second-speed gearshift.
(d) Take out the short interlock pin between the first-second-
speed gearshift fork axle and the third-fourth-speed gear-
shift fork axle
Page 34 of 484
MT-15 Gearbox Disassembly of Gear Box
19. Tear down the third-fourth-speed gearshift fork axle and
the toggle forks of first-second speed gear and third-
fourth speed gear.
(a) Tap out the spring pin with the nail punch and hammer.
(b) Tear down the toggle forks of the third-fourth and first-
second-speed gearshift.
20. Tear down the coupling gear, synchronizer, gear cluster,
thrust washer and needle bearing of the five-speed
gearshift
(a) Tap down the retainer ring of the rear countershaft with
two screwdrivers and one hammer.
(b) Tear down the synchronizer assembly, coupling gear and
gear cluster of the five-speed gearshift. And
(c) Dismantle the five-speed needle bearing.
21. Tear down the thrust washer and five-speed lock ball.
(a) Tear down the thrust washer of five-speed gear.
(b) Take out the lock ball with magnetic rod.
Page 39 of 484
MT-20TransmissionOutput Shaft Assembly (Components Figure)
Output shaft assembly
Components figure
synchronizer spring
expansion ring
snap ringsynchronizer
slide block3th,4th gear synchronizer
meshing sleeve3th gear needle bearing
synchronizer hub of 3rd
and 4th geartoothed ring of
synchronizergear components of 3rd gear
steel ball
synchronizer sliding blocksynchronizer meshing sleeve
of 1st and 2nd gear
gear components
of 1st gear1st gear shaft sleeve
locking ring of output
shaft rear bearing
spring expansion ring
needle bearing of
2nd gear
gear components
of 2th geartoothed ring of synchronizer
for 1st and 2nd geartoothed ring of synchro-
nizer for 1st and 2nd gearneedle bearing of 1st gearrear bearing of
output shaft
gear of 5th gearodometer drive geardrive gear snap ring of odometer output shaft
snap ring of 5th gear
steel ball
Page 40 of 484

MT-21TransmissionOutput Shaft Assembly(Disassembly of Output Shaft Assembly)
Disassembly of output shaft assembly
1. Remove the drive gear of speedometer
(a) Pry down the two shield rings with open end ring plier
(b) Dismantle the drive gear of tachometer.
(c) Take out the steel ball with magnetic stick.
2. Remove the 5th gear,rear bearing of output shaft,1st
gear assembly,1st gear shaft sleeve and needle bearing
of 1st gear
(a) Take down the circlip of 5th gear with two screwdrivers
and one hammer.
(b) Dismantle the rear bearing of output shaft,1st gear assem-
bly and 1st gear sleeve with press machine.
(c) Remove the needle bearing of 1st gear.
3. Remove the synchronized ring
4. Take down the steel ball
Take out the steel ball with magnetic rod.
5. Take down the 1st and 2nd gear synchronizer assembly,
2nd gear assembly,and 2nd gear needle bearing.
(a) Remove the 1st and 2nd synchronizer assembly and 2nd
gear components.
(b) Take off the needle bearing of the 2nd gear.
6. Take down the meshing sleeve ,sliding block and spring.
Remove the three sliding blocks and two springs from the
synchronizer assembly with one screwdriver.
Page 41 of 484
MT-22TransmissionOutput Shaft Assembly(Disassembly of Output Shaft Assembly)
7. Take down the 3rd and 4th gear synchronizer assembly,
3rd gear and needle bearing .
(a) Remove the snap ring with plier for snap ring.
(b) Take down the 3rd and 4th gear synchronizer assembly and
3rd gear with press machine.
(c) Remove the needle bearing .
8. Take off the meshing sleeve ,sliding block and spring
from 3rd and 4th synchronizer.
Remove the three sliding blocks and spring from the meshing
sleeve with one screwdriver.
Page 44 of 484

MT-25TransmissionOutput Shaft Assembly(Assembly of Output Shaft Assembly)
Assembly of output shaft assembly
1. Assembly of synchronizer
(a) Insert the synchronizer hub and sliding block into the gear
sleeve.
(b) Install the spring expansion ring under the sliding block.
Note:The openings of spring expansion ring should be
staggered during installation .
2. Install the gear components of 3rd gear and synchronizer
of 3rd and 4th gear on the output shaft.
(a) Smear the gear oil on the shaft and the needle bearing of
3rd gear.
(b) Put the synchronized ring on the components of gear of 3rd
gear, and align the notch of synchronized ring and sliding
block.
(c) Install the needle bearing into gear components of 3rd gear.
(d) Assembly the gear components of 3rd gear and synchro-
nizer of 3rd and 4th gear with pressing machine.
3. Assembly of snap ring for shaft
To choose one snap ring which make the axial clearance be
Min, and install it on the shaft.
3/4 gear posititon
1/2gear posititon
front
front side
Page 45 of 484
MT-26TransmissionOutput Shaft Assembly(Assembly of Output Shaft Assembly)
Standard clearance:
For the transmission made by Shang Chi(0.150.33)mm
For the transmission made by Tang Chi:(0.090.33)mm
5. Assembly for the gear components of 2nd and
synchronizer of 1st and 2nd gear
(a) Smear the gear oil on the needle bearing of gear of 2nd
gear.
(b) Put the synchronized ring on the gear,and align the notch
and shift key.
(c) Install the needle bearing into the gear components of 2nd
gear.
(d) Assembly the gear components of 2nd gear and meshing
sleeve of synchronzer of 1st and 2nd gear with pressing
machine.
6. Check the axial clearance of gear components of 2nd
gear
Measure the axial clearance of gear components of 2nd gear
with feeler gauge.
Standard clearance:
For the transmission made by Shang Chi:(0.150.33)mm
For the transmission made by Tang Chi:(0.090.33)mm
7. Assembly the locking ball and gear components of 1st
gear
(a) Install the locking ball into the shaft.
Page 46 of 484

MT-27TransmissioOutput Shaft Assembly(Assembly of Output Shaft Assembly)
SST
SST
(b) Smear the gear oil on the needle bearing of gear of 1st gear.
(c) Assembly the gear components of 1st gear,synchronized
ring,needle bearing and sleeve of gear of 1st gear.
(d) Install the assembly on the output shaft,and align the notch
of synchronized ring and sliding block .
(e) Turn the sleeve of 1st gear shaft to align the it with the
locking ball.
8. Installation for rear bearing of output shaft
Fix the bearing of output shaft to the output shaft with SST and
pressing machine, make the notch of locking ring of output
shaft rear bearing expose to the tail.
Remark: Hold the sleeve of gear of 1st gear and dont let it fall
off.
9. Install the gear of 5th gear
Fix the gear of 5th gear with SST and pressing machine.
10. Assembly the snap ring of shaft
(a) To choose one snap ring which make the axial clearance
be Min, and install it on the shaft.
Max clearance0.1mm
(b) Knock the snap ring of shaft of 5th gear tightly with
screwdriver and hammer.
11. Measure the axial clearance of gear of 1st gear
Measure the axial clearance of gear of 1st gear with feeler
gauge
Standard clearance:
For the transmission made by Shang Chi:(0.150.33)mm
For the transmission made by Tang Chi:(0.090.33)mm