Isuzu N-Series. Manual — part 1240
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
Trouble symptom and probable cause
Checking and remedy
1. Hard to steering , steering wheel doesn't return well
a. Insufficient lubrication of steering linkage mechanism
b. Improper alignment of front wheel
c. Improper toe in front of the wheel
d. Improper camber and caster of king pin
e. Worn thrust bearing
f. Insufficient pressure of tire
2. Abnormal worn tire
a. Improper position fix of front wheel
b. Improper pressure of front 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
a. Adjust, and replace if necessary
b. Adjust, and inflate
5. Front axle trouble shooting
82
OWNER爷S MANUAL for
HFC1061,HFC1063,HFC1083
series trucks
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. Loosening pinion bearing
d. Loosening 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. Loosening tightening bolts of ring gear
k. Improper contact between ring gear and pinion
l. Worn pinion spline
m. Worn rear half shaft spline
n. Loosening hub bearing
o. Worn hub bearing
p. Looseing tightening bolts of differential case
q. Insufficient oil
r. Bad oil
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. Screw
k. Replace or adjust
l. Replace
m. Replace
n. Replace
o. Adjust bearing preload
p. Screw
q. Fill up
r. Replace
83
6. Rear axle trouble shooting
Trouble symptom and probable cause
Checking and remedy
3. Hot rear axle
a. Oil leak because of damaged seal gasket, loosening
oil drain plug, and jammed vent hole, result in insufficient
lubrication
b. Bad lubrication
c. Over-tighten between pinion and driven gear, over-
tighten on bearing
a. Fill up
b. Replace lubrication accord with the season
c. Readjust
2. Half shaft seal leaking
a. Jammed rear axle vent hole
b. Bad lubrication
c. Tightening between pinion and driven gear, tight be-
aring, and tightening on bearing
a. Fill up and readjust
b. Replace lubrication accord with the season
c. Readjust
84
OWNER爷S MANUAL for
HFC1061,HFC1063,HFC1083
series trucks
7. Steering mechanism trouble shooting
Trouble symptom and probable cause
Checking and remedy
2. Shake of steering wheel, instable steering
a. Loosening steering linkage mechanism
b. Unbalanced front wheel
c. Pendulant too much
d. Damaged grinding wheel
e. Badly worn or too wide clearance of steering linkage
mechanism
a. Tighten properly
b. Balance the wheel
c. Adjust
d. Replace
e. Replace parts
1. Hard to steer and steering wheel with bad return
a. Distorted main shaft, sliding shaft or column
b. Loosening universal joint or column cover
c. Improper rotation of steering wheel bearing
d. Insufficient lubrication of steering linkage mechanism
e. Low pressure tire
a. Replace parts
b. Replace universal joint
c. Replace parts
d. Fill up lubrication
e. Inflate properly
85
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