JAC Trucks. Service manual — part 122
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
88
89
Possible causes and characteristics of faults
Methods of check & elimination
渊1冤it爷s hard to turn or steering wheel cannot return smoothly
(a) Steering wheel shaft, sliding shaft or steering wheel
column deforms
(b) Universal joints loose or get stuck
(c) Bearing of steering wheel column does not rotate well
(d) Steering transmission shaft is not lubricated sufficiently
(e) Tyre pressure is too low
(a) Replace parts
(b) Replace universal joints
(c) Replace parts
(d) Add lubricant
(e) Inflate properly
渊2冤Steering wheel vibrates, steering operation is not sta鄄
ble
(a) Transmission shaft of the steering system looses
(b) Front wheel lose balance
(c) Tire shimmy is too great
(d) Disc grinding wheel damages
(e) Steering transmission shaft is abraded severely or the
clearance is too large
(a) Tighten properly
(b) Balance the wheel
(c) Correct shimmy
(d) Replace
(e) Replace parts
6. Faults of steering mechanism and elimination
Possible causes and characteristics of faults
Methods of check & elimination
渊3冤Front wheel deviates
(a) One of front wheel brakes sticks or shock absorber at
one side is invalid.
(b) Air pressure of one of the front tires is too low
(c) Reeds of leaf spring are misplaced or rupture
(d) Disc grinding wheel damages
(e) Toe-in of the front wheel is improper
(a) Adjust brake clearance or replace shock absorber
(b) Charge enough air
(c) Check front spring assembly
(d) Correct or replace
(e) Readjust
渊4冤Power steering pump leaks oil
(a) Oil seal or O-ring damages
(b) Lock nut or oil outlet plug of the oil seal damages
(a) Replace
(b) Repair
渊5冤Steering is heavy
(a) Steering gear fails
(b) Steering gear fails
(c) Pre-tightening force of the segment gear shaft
bearing is improper
(a) Replace plug components
(b) Measure output pressure of the pump, replace the
gear if necessary
(c) Adjust pre-tightening force of the segment gear shaft bearing
HFC1045
series trucks
90
91
Possible causes and characteristics of faults
Methods of check & elimination
(a) Clearance between shoe slice and drum of the parking
brake is too large
(b) There is oil dirt on brake drum and shoe slice
(c) Friction disc is over worn
(d) Parking brake cable is not adjusted and comes off;
clip spring is not installed
(a) Both upper and lower clearance should be adjusted
to 0.65mm
(b) Clean
(c) Replace
(d) Adjust, weld the joints properly, install clip spring
7.Parking brake is ineffective and relative elimination
8.Fault of service brake and elimination
Possible causes and characteristics of faults
Methods of check & elimination
渊2冤Brake efficiency is not good
(a) Air pressure is insufficient
(b) Free stroke of pedal is too long
(c) Clearance between brake drum and shoe slice is too
large
(a) Check or replace air pump, check the pipeline for leak
(b) Adjust to 8-12mm
(c) Adjust
渊1冤Service brake is ineffective
(a) Brake hose or pipeline ruptures
(b) Master cylinder valve of the brake is invalid
(a) Repair or replace
(b) Check & repair or replace
HFC1045
series trucks
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