JAC Trucks. Manual - part 107
59
pacitance into battery. Cut down the
charging current for half after single
cell's voltage reaches 2.4V. After
charging battery for 3~5 hours, if the
specific gravity of electrolyte don't
rise any more, keep on charging for
2~3 more hours. Table 2 shows the
relationship between temperature
and the corrected specific gravity
value of electrolyte.
6)Protect the joint of terminal post
and wire from dirt and loose, or the
terminal post will be burnt. Applying
a Vaseline coat on the terminal post
after tighten the joint which can pro鄄
tect joint from rust and loose contact,
so that engine can be started easily.
7)If left unused for a long time, bat鄄
tery should be removed and pre鄄
served in a place where is dry,
shady, cool, and ventilative And do
the additional charging every month.
(吁)Sensor
1. Fuel level gauge sensor
The fuel level sensor is sliding re鄄
sister. Floating on the fuel level, the
float rises and drops with the level's
change. This change causes the re鄄
sister connected in circuit and short鄄
ed, and make the electromagnetic fu鄄
el level gauge changes. Connecting
the fuel level alarm lamp's terminal
with the indicator light can shows the
lowest fuel level.
2. Water temp sensor
The temp sensor is a thermistor
which is mounted in water jacket to
detect the temp of cooling water. It is
connected with the water temp
gauge on instrument board. The wa鄄
Loca
Specific gravity of
fully charged bat鄄
tery under 15益
Where temp above -30益 in winter
1.290 1援260
Where temp above -20益 in winter
1援280 1援250
Where temp above -10益 in winter
1援270 1援240
Where temp below 0益 in winter
1援270 1援240
Winter Summer
Where temp below -40益 in winter
1援310 1援270
Table 1 Specific gravity of electrolyte
Measured temp
of electrolyte
+45益+30益+15益 0益 -15益-30益-45益
Corrected value
on hydrometer
+0.02 +0.01 0 -0.01 -0.02 -0.03 -0.04
Table 2 Corrected specific gravity
value of electrolyte under 15益
when vehicle park in dark or fog, al鄄
so when run in day to show the posi鄄
tion and the width of the vehicle.
3. Fog lamp
Fog lamp can light further in fog than
other lamp. They should be turned
on when vehicle run or park in fog or
in dark, so that vehicle can be seen
clearly. Fog lamp is combined with
headlamp.
4. Ceiling lamp
The ceiling lamp is installed on the
ceiling, and it is combined with in鄄
side rear mirror together. It can light鄄
en the cab, and also it can observe
the condition behind.
(郁)Battery
1. General
The battery of this series is aneroid,
and it is sealed by a plastic case.
This kind of battery has a big capac鄄
ity and a light weight.
2. Use & Note
1) Keep the case clean, and protect
battery from leak.
2) Make sure that the hole on the
upper cap not choked, or the plate
will be damaged by the vapor pro鄄
duced own to electrolyzing.
3)The electrolyte level should be 10~
15mm higher than plate. Only dis鄄
tilled water can be filled into battery.
Never fill battery with fountain or river
water, for them will do harm to it.
4)Check the electrolyte for specific
gravity and level. Do it every 10~15
days in winter, while do it every 5~10
days in summer. Specific gravity is
measured with gravimeter. Table 1
shows normal specific gravity of
electrolyte.
5)The battery should always being
charged. Check battery for electrical
voltage if engine is hard to be start鄄
ed. Additional charging if it is detect鄄
ed that specific gravity of electrolyte
lower than 1.18 ~1.20, or battery
plates will be vulcanized and it will
do harm to the plates. Additional
charging should be held for 13 ~16
hours, and it can breathe 1/10 of ca鄄
58
HFC1048
series trucks