JAC Trucks. Manual - part 97

Being used, the vehicle will often be broke along with it travels longer and longer. In order to recover vehicle to normal
proper situation, also to prolong its life, the trouble must been find out and then been disposed in an effective way.
* To shoot troubles of engine, see Engine Operating Instruction Manual which every vehicle have been equipped.

Trouble symptom and probable cause

Checking and remedy

1. Noise or vibration of driveshaft

a. Worn universal joint

b. Bending of driveshaft

c. Loose couple flange or center bracket bolts

d. Defective center bracket rubber sleeve

e. Insufficient lubrication

a. Change spider direction or replace universal joint as鄄

sembly

b. Align or replace

c. Retighten

d. Replace

e. Fill up after cleaning

2. Overheating center bracket

a. Too much tight of oil seal

b. Too bigger a inclination between driveshaft and

crankshaft

c. Insufficient lubrication

a. It will disappear along with travel longer

b. Check and adjust the inclination

c. Fill up regularly

Drive shaft trouble shooting

HFC1020

series trucks

Clutch trouble shooting

Trouble symptom and probable cause

Checking and remedy

3. Clutch can't release completely

a. Too long free play of pedal

b. Wear or crack locking collar

c. Crack or distort of wave sheet

d. Broken damper spring

a. Adjust to 3~5mm

b. Replace

c. Replace

d. Replace

1. Shaking clutch

a. Overloading too much vehicle

b. Not start in low gear

c. Defective release bearing or insufficient oil

d. Corrugated fin cracked, friction lining worn, loose riv鄄

et, damper spring broken, or damper fin broken down.

a. Load by rated load

b. Start in first gear when loading much

c. Clean, lubricate or replace

d. Replace

2. Clutch Slip

a. Thin friction lining, rivet reveal, or oil coat

b. Weak pressure of diaphragm spring

c. Too short free play of pedal

d. Vehicle loads too much

e. Not start in low gear

f. The pedal is hold pressed when running

a. Clean, or rivet a new friction lining

b. Replace

c. Adjust to 3~5mm

d. Load accord the rated load

e. Start in low gear

f. Change your bad driving habit

Trouble symptom and probable cause

Checking and remedy

1. Hard steering, steering wheel doesn't return well

a. Insufficient lubrication of steering linkage mechanism
b. Improper alignment of front wheel
c. Improper toe in of front wheel
d. Improper camber and caster of king pin

e. Worn thrust bearing
f. Insufficient pressure of tire

a. Apply lubrication on king pin and ball stud
b. Adjust
c. Adjust
d. Check the linear for wear, and check knuckle and tie
rod for deviation, replace if necessary
e. Replace
f. Inflate properly

2. Abnormal worn tire

a. Improper position fix of front wheel
b. Improper pressure of front tire

a. Adjust, and replace if necessary
b. Adjust, and inflate

Front axle trouble shooting

HFC1020

series trucks

Trouble symptom and probable cause

Checking and remedy

3. Vibrate or oscillate

a. Improper position fix of front wheel
b. Worn king pin linear
c. Improper pretightening of hub bearing
d. Worn hub bearing
e. Loosen ball stud of tie rod
f. Loosen nuts on U-type bolt
g. Loosen hub nuts
h. Distorted wheel
i. Unbalance wheel
j. Wheel deviation
k. Asymmetry or insufficient inflation of tire

a. Adjust, and replace if necessary
b. Replace linear
c. Adjust
d. Replace
e. Replace all end parts of tie rod
f. Tighten
g. Tighten
h. Replace
i. Adjust and balance
j. Adjust
k. Adjust, inflate

4. Grease leak from hub

a. Worn seal
b. Loosen hub cover
c. Too much grease

a. Replace
b. Tighten
c. Apply grease with specified volume

Trouble symptom and probable cause

Checking and remedy

1. Gears break off

a. Worn or damaged coupling
b. Loosen nuts or bolts
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. Loosen bolts which mount transmission to engine

a. Replace the coupling
b. Tighten
c. Readjust
d. Repair or replace parts
e. Replace shift fork
f. Replace
g. Replace

h. Replace bearing

i. Replace
j. Tighten

2. Gears hard to mesh

a. High speed idle speed of engine
b. Improper meshing of clutch
c. Coherence of clutch plate
d. Bend clutch slip sleeve

a. Adjust the idle speed
b. Adjust clutch
c. Repair or replace
d. Replace

Transmission trouble shooting

HFC1020

series trucks

Trouble symptom and probable cause

Checking and remedy

4. Hard to shift

a. Improper adjustment of shift knob
b. Worn hinge joint or pin
c. Worn control mechanism
d. Loosen bolts or nuts

a. Adjust shift knob
b. Replace
c. Replace
d. Check and tighten

e. Worn or damaged bearing or input shaft or output

shaft

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. Tighten or adjust
i. Replace
j. Apply lubrication
k. Fill up or replace

3. Noise from transmission

a. Loosen bolts which mount transmission to engine
b. Worn gear or bearing

a. Tighten
b. Replace

Trouble symptom and probable cause

Checking and remedy

1. Abnormal noise from rear axle

a. Worn or damaged pinion bearing
b. Worn or damaged side bearing of differential
c. Loosen pinion bearing
d. Loosen differential bearing
e. Worn pinion and ring gear
f. Worn thrust washer
g. Worn differential spider
h. Worn pinion and ring gear
i. Worn or damaged side gear and planetary gear
j. Loosen tightening bolts of ring gear
k. Improper contact between ring gear and pinion
l. Worn pinion spline
m. Worn rear half shaft spline
n. Loosen hub bearing
o. Worn hub bearing

a. Replace bearing
b. Replace bearing
c. Adjust preload
d. Adjust preload
e. Adjust tooth space
f. Replace
g. Replace
h. Replace
i. Replace
j. Tighten
k. Replace or adjust
l. Replace
m. Replace
n. Replace
o. Adjust bearing preload

Rear axle trouble shooting

HFC1020

series trucks

Trouble symptom and probable cause

Checking and remedy

3. Hot rear axle

a. Oil leak because of damaged seal gasket, loosen oil

drain plug, and jammed vent hole, result in insufficient lu鄄
brication

b. Bad lubrication

c. Tight over between pinion and driven gear, tight over

on bearing

a. Fill up and readjust

b. Replace lubrication accord the season
c. Readjust

p. Loose tightening bolts of differential case
q. Insufficient oil
r. Bad oil

p. Tighten
q. Fill up
r. Replace

2. Half shaft seal Leaking

a. Jammed rear axle vent hole
b. Bad lubrication

c. Tight between pinion and driven gear, tight bearing,

and tight over on bearing

a. Fill up and readjust
b. Replace lubrication accord the season
c. Readjust

Content .. 95 96 97 98 ..