JAC Trucks. Service manual — part 38
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
Trouble symptom and probable cause
Checking and remedy
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 front leaf spring
d. Damaged grinding wheel
e. Improper toe in front of the wheel
4. Power steering bump leaking
a. Damaged oil seal or O ring
b. Damaged oil seal locking nuts or oil -drain plug
a. Adjust the brake clearance or replace damper
b. Inflate tires
c. Check front spring assembly
d. Adjustor replace
a. Replace
b. Repair
7. Parking brake failure shooting
86
OWNER爷S MANUAL for
HFC1061,HFC1063,HFC1083
series trucks
8. Running brake trouble shooting
Trouble symptom and probable cause
Checking and remedy
2. Brake bias
a. Improper clearance of brake shoe
b. Rust of single sided cam shaft frame shaft or cam shaft
frame
c. Shoe has oily dirt
d. Unequal pressure of left and right wheel
e. Brake drum is out of shape and bad contact of friction
disc
a. Readjust
b. Remove rust and lubricate
c. Clean
d. Inflate accord with formulation
e. Check and grind
1. Insufficient of brake force
a. Brake chamber's pull stoke is short and the maximum
adjusting pressure is small
b. Sintered shoe and pasted with soil water and oily dirt
c. Rusted cam frame or shoe shaft
d. Air leak of brake chamber's leather film, pipeline and
junction point
e. Air leak of brake valve and air outlet valve
f. Improper clearance between brake drum and shoe
a. Adjust length of pull rod
b. Clean with alkaline water
c. Clear rust away and lubricate
d. Replace leather film and check air leak position
e. Replace valve bearer
f. Readjust
g. Check or replace
h. Make it unblocked
i. Check opening degree of air inlet valve
87
88
Trouble symptom and probable cause
Checking and remedy
a援 Big clearance between parking brake and brake drum
b援 Oily dirt on brake drum and shoe
c援 Over wearing of friction disc
a援 Adjust it to 0.65mm
b. Clean
c. Replace
9. Parking brake trouble shooting
OWNER爷S MANUAL for
HFC1061,HFC1063,HFC1083
series trucks
89
Trouble symptom and probable cause
Checking and remedy
3. Inefficient of shock absorption
a. Lack of shock absorption fluid
b. No maintenance periodically
c. Damaged leather ring
a. Fill up
b. Maintenance periodically
c. Replace
1. Steel plate spring break
a. Overload or go out of right position
b. Frequent emergency brake and high speed on un even
road
c. Saddle clamp bolt and steel plate clip are uncrowned
a. Load as rated and distribute on the right place
b. Concentrate on driving, avoid emergency brake and
slow down the speed on bad road
c. screw saddle clamp bolt and steel plate clip or replace
2. Noise through running
Check or replace suspension rubber belt
10. Suspension trouble shooting
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