JAC Trucks. Manual — part 121
77
遇尧Fault diagnosis and elimination
1. Transmission shaft faults and elimination
2. Clutch faults and elimination
3. Front axle faults and elimination
4. Transmission faults and elimination
5. Rear axle faults and elimination
6. Steering mechanism fault and elimination
7. Fault of ineffective parking brake and elimination
8. Service brake faults and elimination
9. Wheel faults and elimination
10. Suspension faults and elimination
11. Electric apparatus faults and elimination
79
Possible causes and characteristics of faults
Methods of check & elimination
(1) Transmission shaft chatters, dithers
(a) Universal joint is over worn
(b) Transmission shaft distorts and bends
(c) Connecting bolt of the flange or fixing bolt of the
center support looses
(d) Rubber sleeve of center support damages
(e) Lubricant is insufficient
(a) Adjust installation direction of the cross shaft or
replace direction knuckle assembly
(b) Align or replace
(c) Tighten
(d) Replace
(e) Add lubricant immediately after cleaning
(2) Center support is over heating
(a) Oil seal of bearing is too tight
(b) Included angle between axes of center transmission
shaft and axes of crankshaft is too large
(c) Lubricant is insufficient
(a) Eliminated of its own after certain time of running.
(b) Check and adjust the included angle
(c) Add lubricant regularly
1援Faults of transmission shaft and elimination of faults
78
Many kinds of faults maybe occur in
running with the running mileage in鄄
creasing. You must check the vehicle
carefully to find the fault position, an鄄
alyze the causes of fault and search
for effective methods to eliminate
faults, so that the vehicle can return
to normal working condition, which
prolongs durability of the vehicle.
Engine faults and elimination can be
referred to instructions of engine us鄄
ing along with the vehicle.
HFC1045
series trucks
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
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