JAC Trucks. Service manual — part 37
Second-class maintenance
After break -in period and finish
maintenance during break-in period
by force. Do daily maintenance and
periodic maintenance according to
running condition and technical con鄄
dition. Traveled distance of second-
class maintenance is 1500km when
running on road of good condition.
Please go to special repair station of
JAC to allow us to supply best ser鄄
vice for you.
Seasonal maintenance
When winter and summer alternate,
carry out seasonal maintenance
Summer:
1. Clean out water scale in the cool鄄
ing system.
2. Replace lubrication for summer.
3. Fuel with #0 light diesel oil speci鄄
fied in GB252.
4. Clean up the battery and adjust
the specific gravity of electrolyte.
Winter:
1. Clean up the accumulator and ad鄄
just the specific gravity of electrolyte,
and then remove the accumulator
and charge it.
2. Install cold -proof devices; install
antiskid devices if necessary.
3. Fuel with #10 light diesel oil speci鄄
fied in GB252.
74
OWNER爷S MANUAL for
HFC1061,HFC1063,HFC1083
series trucks
75
Trouble shooting
Being used, the vehicle will often be
broken along with it travels longer
and longer. In order to recover vehi鄄
cle to normal situation and to prolong
its service life, the trouble must been
found out and been disposed in an
effective way.
To shoot troubles of engine, refer to
Engine Operating Instruction Manual.
Electrical system trouble shooting
Fuel gauge doesn't move
Dismantle sensor wire of fuel gauge
and make it earthing. If needle turns
to F, it means fuel gauge works well
while sensor of fuel gauge has trou鄄
ble or instrument fuse has burn out.
Check and replace them. If fuel
gauge stands still, it means it has
been broken down.
Oil pressure indicator lamp doesn't
light
Dismantle oil pressure alarm and
make it earthing . If oil pressure indi鄄
cator lamp doesn't light, it means
switch of oil pressure alarm has been
broken. Replace it with a new one. If
oil pressure indicator lamp still
doesn't light, it means bulb has been
burned down or oil pipe of engine
has trouble.
Vehicle light's signal indicator lamp
doesn't light
I f switch of vehicle light and signal
lamp work well, but indicator lamp
doesn't work, it means there is bad
contact between bulb and instrument
plate, or bulb has been burned down.
76
OWNER爷S MANUAL for
HFC1061,HFC1063,HFC1083
series trucks
77
1. Electrical system trouble shooting
Trouble symptom and probable cause
Checking and remedy
1. Starter doesn't work
a. Bad contact
b. Bad contact of battery input terminal
c. Consistency of lubricant's not good
d. Bad contact of starter relay
a. Wipe or replace contact element
b. Wipe or screw
c. Replace lubricant
d. Repair or replace
2. Insufficient battery capacity
a. New battery without circulation of charging and discharg鄄
ing,orhasnotbeenchargedtoratedquantity
b. Generator without charging or enough charging
c. Damaged pole plate
d. low level or improper specific gravity of electrolyte.
a. Charge as specified
b. Check connections and repair
c. Check and repair
d. Fill up electrolyte and charge outside vehicle
3. Too much waste of electrolyte.
a. Reduce the frequency of starting and shorten starting
time. Decrease amperage of charging current
b. Replace battery case
4. Self-discharge of battery
a. earth short on battery output cable
b. A short- circuit between pole plates
c. Damaged or broken down cell divider
d. Dirt external surface of battery case. Metal impurities mixed
with electrolyte
a. Clean the output cable, dispose the short-circuit
b. Check and repair
c. Check and repair
d. Clean the battery case. Tighten shield.
Replace electrolyte if necessary
78
2. Clutch trouble shooting
Trouble symptom and probable cause
Checking and remedy
3. Clutch can't release completely
a援 Too long free play of pedal
b援 Crack or distort of wave sheetc援Broken damper spring
a援 Adjust 3-5mm
b援 Replace c援Replace
1. Shaking clutch
a援Overloading
b援Not start in low gear
c援Defective release bearing or insufficient oil
d援Corrugated fin cracked, friction lining worn, loose rivet,
damper spring broken, or damper fin broken down
a. Load as rated
b. Start in first gear when loading much
c. Clean, lubricate or replaced. Replace
2. Clutch slip
a援Thin friction lining, rivet reveal, or oil coat
b援Weak pressure of diaphragm spring
c援Too short free play of pedal
d援Vehicle loads too much
e援Not start in low gear
f援The pedal is held pressed when running
a援 Clean, or rivet a new friction lining
b援 Replace
c援 Adjust to 3-5mm
d援 Load as rated
e援 Start in low gear
f援 Change bad driving habit
OWNER爷S MANUAL for
HFC1061,HFC1063,HFC1083
series trucks
79
Trouble symptom and probable cause
Checking and remedy
1. Noise or vibration of driveshaft
a援 Over- worn universal joint
b援 Bending driveshaft
c援 Loose couple flange or center bracket bolts
e援 Insufficient lubrication
a援 Change spider direction or replace universal joint as鄄
sembly
b援 Align or replace
c援 Screw
d. Replace
e援 Fill up after cleaning
2. Overheating center bracket
a援 Oil seal is too tight
b援 Inclination between driveshaft and crankshaft is too big
c援 Insufficient lubrication
a援 It will disappear along with traveling
b援 Check and adjust the inclination
c援 Fill up regularly
3. Drive shaft trouble shooting
Trouble symptom and probable cause
Checking and remedy
1. Gears break off
a. Gears break off
b. Worn or damaged coupling
c. Improperly adjusted linkage
d. Distorted, worn, or crack spring or locking ball
e. Worn shift fork and groove face
f. Worn synchronizer hub and sleeve
g. Worn or damaged synchronizer hub and engagement
sleeve
h. Worn or damaged bearing of input shaft and output
shaft
i. Worn or damaged thrust ring and thrust washer
j. loosening mounting bolt
a. Replace the coupling
b. Screw
c. Readjust
d. Repair or replace parts
e. Replace shift fork
f. Replace
g. Replace
h. Replace bearing
i. Replace
j. Screw
2. Gears are hard to mesh
a. High idle speed of engine
b. Improper meshing of clutch
c. Coherence of clutch plate
d. Bending clutch slip sleeve
a. Adjust the idle speed
b. Adjust clutch
c. Repair or replace
d. Replace
4. Transmission trouble shooting
80
OWNER爷S MANUAL for
HFC1061,HFC1063,HFC1083
series trucks
Trouble symptom and probable cause
Checking and remedy
4. Hard to shift
a. Improper adjust of shift knob
b. Worn hinge joint or pin
c.Worn control mechanism
d. Loosening bolts or nuts
a. Adjust shift knob
b. Replace
c. Replace
d. Check and screw
e. Worn or damaged bearing or input shaft or output
f. Worn or damaged guide bearing of crankshaft
g. Worn cone and cone ring of synchronizer
h. Loose control mechanism or improper adjustment
i. Worn shift lever
j. Improper lubricated knob
k. Insufficient or low viscosity lubrication
e. Replace bearing
f. Replace bearing
g. Replace
h. Screw or adjust
i. Replace
j. Apply lubricator
k. Fill up or replace
3. Noise from transmission
a. Loosen bolts which mount transmission to engine
b. Worn gear or bearing
a. Screw
b. Replace
81
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