40
venient as well as decrease impact
abrasion to gear ends, shorten the
time of shifting, increase average
speed and reduce labor intension of
the driver etc.
Selecting and shifting are mainly
completed by mechanisms inside the
transmission cover assembly.
2) Using and maintenance:
1) If the gear shifting can not operate
or is hard to operate as the engine is
not working, which indicates that the
gear shifting lever (or the flexible
shaft) is not adjusted well or the bolts
become loose, you must adjust the
control lever (or the flexible shaft),
check and tighten each bolt and nut.
2) If there is out-of-gear as the vehi鄄
cle running on rough road, which in鄄
dicates that the gear shifting lever (or
the flexible shaft) is not adjusted
well, you must adjust the control
lever (or the flexible shaft).
3) If free play of the control lever is
too large, check and tighten each
bolt and nut.
4) Do not take gear-shifting opera鄄
tion when the engine works at an
over fast speed to avoid to aggra鄄
vate wearing of the synchronizer.
5) When shifting, the force should be
gentle. The hand force must be act鄄
ed on the control lever until the gear
reaches the correct position. Shifting
with flap of push and loosening is in鄄
appropriate and the shifting opera鄄
tion cannot be accomplished easily
in this way.
6) You can shift from forward gear to
reverse gear or from reverse gear to
forward gear only after the vehicle
stops stably, or else, the gear can be
damaged.
7) If the fifth gear is over -speed
gear, it can be used when the vehi鄄
cle speed is over 50 km/h to avoid
damage of the over-speed gear re鄄
sulting from over load.
8) During driving, if there is any ab鄄
normal noise in the transmission,
stop the vehicle and check it, elimi鄄
nate the malfunction.
9) When sliding on the downgrade,
stalling of the engine is not allowed;
starting the engine with the inertia of
sliding on the downgrade is forbid鄄
den in case of damage of the gear
41
and the synchronizer.
10) During breaking-in period of the
new vehicle, because the metal
chipping which was produced by the
frictional function between new parts
does harm to components in the
transmission, especially to the dura鄄
bility of the conical rings of the syn鄄
chronizer, so the lubricating oil
should be replaced after the break鄄
ing-in period of the new vehicle ex鄄
pires. Under general condition, re鄄
place the lubricating oil once for ev鄄
ery 6000 km running. When replac鄄
ing the lubricating oil, first drain the
oil in the transmission, prop up the
rear axle, shift the transmission into
the reverse gear, add kerosene,
keep the transmission rotating for 2耀
3 minutes, then drain kerosene, add
pure gear oil.
11) Check the oil level in the trans鄄
mission frequently, if the oil level is
under the lower edge surface of the
oil filler bolt hole, sufficient oil should
be added.
12) Check the outside bolt of the
transmission and the flange of the
second shaft for tightening and
working condition of the components
in the transmission frequently. Be鄄
cause the vent plug is easy to block
by dust, which causes increasing of
pressure in the transmission, oil
seepage or leakage, so the vent plug
should be cleaned periodically.
13) The movement parts of shifting
operation component should be kept
in good lubricating condition, or else,
it will be hard to shift because of the
wearing of the movement parts. If the
position of gear selecting is found
incorrect, or gear shifting is difficult
or the transmission is out of gear au鄄
tomatically in using, firstly you should
readjust the gear selecting and
shifting mechanism.
2.Shifting control device of the
transmission
1) Brief description of structure
The shifting control device of the
transmission adopts long distance
soft cable type with high floor and
short lever, and it takes two hoses to
implement the gear selecting and
shifting which is shown in the figure
right above. It is mainly composed of
HFC1045
series trucks