Isuzu N-Series. Service manual — part 1324
81
2. Clutch faults and elimination
Possible causes and characteristics of faults
Methods of check & elimination
(1) Clutch dithering
(a) The vehicle overloads too much
(b) Not start at a low-speed gear
(c) Release bearing is short of oil and damaged
(d) Corrugated sheet cracks, friction disc damages, rivets
loose, spring of shock absorber ruptures or shock ab鄄
sorbing damping slice damages.
(a) Load according to specification
(b) Start at 1st gear
(c) Clean, lubricate or replace
(d) Replace
(2)Clutch slip
(a) Friction disc is too thin, rivet reveal or has oil dirt on it
(b) Pressure of diaphragm spring is insufficient
(c) Free stroke of the clutch pedal is too small
(d) The vehicle overloads too much
(e) Not start at a low-speed gear
(f) Keep one's foot on clutch pedal in driving
(a) Clean it up or rivet a new friction disc
(b) Replace
(c) Fit to 3-5mm
(d) Load according to specification
(e) Start at a low-speed gear
(f) Change bad driving habits
(3)Clutch release is not complete
(a) Free stroke of clutch pedal is too large
(b) Inner and outer lock rings wear or rupture
(a)Fit to 3-5mm
(b) Replace
Possible causes and characteristics of faults
Methods of check & elimination
(c) Corrugated sheet cracks or distorts
(d) Spring of shock absorber ruptures
(c) Replace
(d) Replace
80
Possible causes and characteristics of faults
Methods of check & elimination
渊1冤It爷s hard to turn or the steering wheel cannot return
smoothly
(a) Steering tie rod is not lubricated sufficiently
(b) Front wheel alignment is improper
(c) Toe-in angle is improper
(d) Camber angle and rear inclination angle of king pin
are improper
(e) Thrust bearing is abraded
(f) Inflation pressure of tire is too low
(a) Lubricate king pin and ball end
(b) Correct
(c) Correct
(d) Check wearing of the sleeve and deviation of steering
knuckle and front wheel tie rod. Replace if necessary
(e) Replace
(f) Inflate properly
渊2冤 Tire is abnormally abraded
(a) Front wheel alignment is improper
(b) Inflation pressure of tire is improper
(a) Adjust, replace parts if necessary
(b) Adjust, inflate
3援Front axle faults and elimination
HFC1045
series trucks
82
83
Possible causes and characteristics of faults
Methods of check & elimination
渊3冤Vibrates or swings
(a) Alignment of front wheel is improper
(b) King pin bushing is worn
(c) Pre-tightening degree of hub bearing is improper
(d) Hub bearing is worn
(e) Ball ends of tie rod loose
(f) U-bolts, U-nuts loose
(g) Hub nuts loose
(h) Disc distorts
(i) Tires do not balance
(j) Tire deviates
(k) Air pressure is nonuniform or insufficient
(a) Adjust, replace parts if necessary
(b) Replace bushing
(c) Adjust
(d) Replace
(e) Replace all parts at the end of the tie rod
(f) Tighten
(g) Tighten
(h) Replace
(i) Adjust balance
(j) Correct
(k) Adjust and inflate
渊4冤Wheel hub leaks lubricant
(a) Oil seal is abraded
(b) Hub cover bolt looses
(c) Lubricant is too much
(a) Replace
(b) Tighten
(c) Add specified quantity of lubricant
Possible causes and characteristics of faults
Methods of check & elimination
渊1冤Gear gets out
(a) Coupling joint is abraded or damaged
(b) Screws and nuts loose
(c) Connection rod is not adjusted well
(d) Lock ball and spring deform, are abraded or damaged
(e) Shift fork and groove surface are abraded
(f) Synchronizer wheel hub and bush are abraded
(g) Synchronizer bush and tooth surface of the gear
clutch are abraded or damaged
(h) Input or output bearing is abraded or damaged
(i) Stop ring or thrust washer is abraded or damaged
(j) Installing screws of transmission and engine loose
(a) Replace
(b) Tighten
(c) Readjust
(d) Repair or replace
(e) Replace shift fork
(f) Replace
(g) Replace
(h) Replace bearing
(i) Replace
(j) Tighten
4. Transmission faults and elimination
HFC1045
series trucks
84
85
Possible causes and characteristics of faults
Methods of check & elimination
渊4冤Gear shifting is hard
(a) Shifting lever is not adjusted properly
(b) Articulated joints and pins are abraded
(c) Control damages
(d) Bolts and nuts loose
(a) Adjust the control lever
(b) Replace
(c) Replace
(d) Check and tighten
渊3冤Transmission chatters
(a) Installing screws of transmission and engine loose
(b) Gears or bearings are abraded
(a) Tighten
(b) Replace
Possible causes and characteristics of faults
Methods of check & elimination
渊2冤Gears are hard to mesh
(a) Engine idling speed is too high
(b) Clutch meshing is not good
(c) Clutch disc adheres
(d) Sliding bush of clutch inflects
(e) Input or output bearing is abraded or damaged
(f) Guide bearing of engine crankshaft is abraded or
damaged
(g) Synchronizer cone and ring are damaged
(h) Control system looses or is not adjusted properly
(i) Shift fork is abraded
(j) Control lever is not lubricated well
(k) Lubricant is insufficient or the viscidity degree is too
low
(a) Adjust idling speed
(b) Adjust clutch
(c) Repair or replace
(d) Replace
(e) Replace bearing
(f) Replace bearing
(g) Replace
(h) Tighten or adjust
(i) Replace
(j) Lubricate
(k) Add or replace lubricant
HFC1045
series trucks
86
Possible causes and characteristics of faults
Methods of check & elimination
渊1冤Rear axle makes abnormal noise
(a) Pinion bearing is abraded or damaged
(b) Side bearing of the differential is abraded or
damaged
(c) Pinion looses
(d) Differential gear looses
(e) Gear rings and pinions are abraded
(f) Thrust washer damages
(g) Differential cross shaft damages
(h) Gear rings and pinions are abraded
(i) Side bearing of the differential and pinion are abraded
or damaged
(j) Tightening bolt of the gear ring looses.
(k) Gear ring and pinion teeth do not contact well
(l) Pinion spline damages
(m) Shaft spline of rear axle damages
(n) Wheel hub bearing looses
(a)Replace bearing
(b) Replace bearing
(c) Adjust pre-tightening degree of bearing
(d) Adjust pre-tightening degree of bearing
(e) Adjust gear clearance
(f) Replace
(g) Replace
(h) Replace
(i) Replace
(j) Tighten
(k) Replace or adjust
(l) Replace
(m) Replace
(n) Replace
5.Faults of rear axle and elimination
87
Possible causes and characteristics of faults
Methods of check & elimination
渊3冤Rear axle heats
(a)oil seal gasket damages, oil outlet bolt looses, ventila鄄
tion hole is jammed, which causes that the lubricant is in鄄
sufficient
(b) Lubricant quality is bad
(c)Driving & driven gears as well as bearing are
adjusted too tightly
(a) Readjust after filling lubricants
(b) Replace lubricant in time according to season changing
(c) Readjust
(o) Wheel hub bearing is abraded
(p) Tightening bolts of gearbox loose
(q) Oil is insufficient
(r) Oil quality is not good
(o) Adjust pre-tightening degree of bearing
(p) Tighten
(q) Fuel
(r) Replace
渊2冤oil seal of semi-shaft leaks oil
(a) Ventilation hole or rear axle is jammed
(b) Lubricant quality is bad
(c) Driving & driven gears as well as bearing are
adjusted too tightly
(a) Readjust after filling lubricant
(b) Replace lubricant in time according to season changing
(c)Readjust
HFC1045
series trucks
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