JAC Trucks. Service manual — part 98
Trouble symptom and probable cause
Checking and remedy
2. Shake of steering wheel, instable steering
a. Loosen steering linkage mechanism
b. Unbalance front wheel
c. Pendulate too much
d. Damaged grinding wheel
e. Heavy wear or too big 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. Loosen 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
Steering mechanism trouble shooting
68
HFC1020
series trucks
Trouble symptom and probable cause
Checking and remedy
5. Heavy steering
a. Bad steering gear
b. Bad steering gear
c. Improper preload sector gear bearing
a. Replace piston set
b. Check pump for output pressure, replace if necessary
c. Adjust the pretightening force of bearing
3. Wander front wheel
a. One of the front brake or damper is disabled
b. One of the front tire low pressure
c. Disalign or break of the front leaf spring
d. Damaged grinding wheel
e. Improper toe in of front wheel
a. Adjust the brake clearance or replace damper
b. Inflate tires
c. Check front spring assembly
d. Adjust or replace
e. Readjust
4. Power steering bump leaking
a. Damaged oil seal or O ring
b. Damaged oil seal locking nuts or oil-drain plug
a. Replace
b. Repair
69
Trouble symptom and probable cause
Checking and remedy
a. Big clearance between brake pad and drum
b. Oil coat on brake pad or drum
c. Badly worn friction pad
d. Brake cable's maladjustment, break joint, or circlip
drop out
a. Adjust the clearance until both its upper and lower is
0.65mm
b. Clean with water
c. Replace
d. Adjust, weld the joint, install a circlip
Parking brake failure shooting
70
HFC1020
series trucks
Running brake trouble shooting
Trouble symptom and probable cause
Checking and remedy
2. Bad brake effect
a. Big pedal free play
b. Air in brake system, oil leaking from the joints, or
jammed brake tube
c. Improper clearance between brake pad and drum
d. Jammed piston in wheel cylinder or main cylinder
a. Adjust until it is 5~8mm
b. Bleed system, deal with leak, or repair
c. Adjust the wheel cylinder piston
d. Repair or replace
1. Running brake failure
a. Crack of brake hose or tube
b. Failed valve in master cylinder
c. Failed vacuum parts
a. Repair or replace
b. Check and replace
c. Check the check valve and vacuum pump for leak;
Weld the vacuum pump, replace joints of hoses and
tubes
71
Trouble symptom and probable cause
Checking and remedy
4. Hot brake
a. Small clearance between brake pad and drum
b. Broken or failed return spring
c. Swelling leather ring in wheel cylinder
a. Adjust
b. Replace
c. Replace
3. Wander when brake
a. The clearances between brake pad and drum are not
equal from wheel to wheel
d. Distorted brake drum
c. Oil coat on brake pad or drum
d. Unequal tire pressure
e. Broken return spring
f. Swelling leather ring in wheel cylinder
g. Distorted frame, disalign front suspension, or improp鄄
er orientation of front wheel
a. Adjust clearances to the same
b. Replace
c. Snag the brake pad with emery cloth after clean it with
petrol or soda water
d. Inflate by specification
e. Replace
f. Replace
g. Repair, replace, or dispose by fitting way
72
HFC1020
series trucks
Trouble symptom and probable cause
Checking and remedy
1. Badly worn tire
a. High or low tire pressure
b. Too much overloading or dissymmetrical loading
c. Loosen wheel hub bearing
d. Improper toe-in of front wheel
e. Frequent emergency brake, flare up when starting, or
accelerate suddenly
f. No wheel transposition
a. Inflate by specification
b. Load as rated
c. Adjust
d. Adjust the toe-in until it is 3~6mm (for diagonal tire)
and 1~3mm (for radial tire)
e. Drive stably, don't drive too fast
f. Transposition regularly
Wheel trouble shooting
73
Trouble symptom and probable cause
Checking and remedy
3. Bad absorption
a. Insufficient damping fluid
b. Having no maintaince regularly
c. Damaged rubber collar
a. Fill up as rated
b. Maintain regularly
c. Replace
1. Broken leaf spring
a. Load too much or partial to one wheel
b. Frequent emergency brake, drive too fast on uneven
road
c. Loosen U-bolt. Loosen or broken spring clamp
d. Failed damper
a. Load properly as rated
b. Keep your mind on driving, so that avoid emergency
brake and slower speed on uneven road
c. Tighten U-bolt. Tighten or replace spring clamp.
d. Repair or replace
2. Noise in driving
Check and replace rubber suspension part
Suspension trouble shooting
74
HFC1020
series trucks
Trouble symptom and probable cause
Checking and remedy
4. Self-discharge of battery
a. Battery output cable short to ground
b. a short circuit between pole plates
c. Damaged or breakdown cell divider
d. Dirt external surface of battery case. Metal impurities
mixed into electrolyte
a. Clean the output cable, dispose the short
b. Check and repair
c. Check and repair
d. Clean the battery case. Tighten shield. Replace elec鄄
trolyte if necessary
1. Horn brows continuously
a. Incorrect connection
b. Failed grounding or spring in circuit
a. Check and connect again
b. Disassembly and replace
2. Insufficient electric capacity
a. New battery without circulation of charge and dis鄄
charge, or not been charged to rated quantity
b. Generator without charge or enough charge
c. Damaged pole plate
d. Low level or improper specific gravity of electrolyte
a. Charge as specified
b. Check connections and repair
c. Check and repair
d. Fill up electrolyte and charge battery with it separated
form vehicle
3. Too much waste of electrolyte
a. High charging amperage. Electrolyte vaporize or
overflow
b. Leak battery
c. Damaged or breakdown cell divider
a. Reduce the frequency of starting and shorten the start鄄
ing time. Decrease amperage of charging current.
b. Replace battery case
c. Check and repair
Electrical parts trouble shooting
75
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