JAC Trucks. Manual - part 32
when the engine works at an over
fast speed to avoid accelerating the
wear of the synchronizer.
5. When shifting, the force should be
gentle. The hand force must be act鄄
ed on the control rod 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. The fifth gear is over-speed gear,
it can be used when the vehicle
speed is over 50 km/h to avoid dam鄄
age of the over-speed gear resulting
from over loading .
8. During driving, if there is any ab鄄
normal noise in the transmission,
stop the vehicle and check it to 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
and the synchronizer.
10. During breaking-in period of the
new vehicle, because the metal
chipping which is 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 off
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 off 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
34
OWNER爷S MANUAL for
HFC1061,HFC1063,HFC1083
series trucks
35
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
pressure in the transmission, oil
seepage or leakage, so the vent plug
should be cleaned periodically.
13. The movement part of shifting
operation component should be lu鄄
bricated well, or else, it will be hard
to shift because of the wearing of the
movement parts. If the position of
gear selecting is found incorrectly, or
gear shifting is difficult or the trans鄄
mission is out of gear automatically
in using, firstly you should readjust
the gear selecting and shifting mech鄄
anism.
14. Gear selecting/shifting should be
arranged well. The smallest bending
radius should be 200mm or larger
than that.
Drive shaft
Brief description of structure:
Drive shaft of this loaded truck is ex鄄
posed cardan shaft. The front flange
yoke of drive shaft assembly is con鄄
nected with transmission, while the
rear flange yoke is connected with
rear driving gear flange.
1. intermediate driving shaft
2. rear axle driving shaft
Using and maintenance:
1. Drive shaft has been counter鄄
poised in factory, it should be en鄄
sured not to impact in use and not to