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6. Trailer air brake system
1) Insufficient air pressure
2) IInsufficient brake force, air pressure gauge pointer continuously falls
during brake,
continuous exhaust sounds at exhaust mouth
3) Brake situation not being able to be relieved after loosening brake pedal
Cause
Remedies
1. Air pump belt is too loose
Adjust tightness of belt or replace belt
2. Pipe connectors leak
Check out the leaking position and remove
breakdowns
3. Inlet and outlet valve of air compressor
not sealed and spring damaged
Grind valve seat, replace spring
4. Piston rings and cylinder lining of air
compressor seriously damaged
Replace piston rings and cylinder lining
5. Filter blocked
Clean filter
6. Safety valve is not completely closed or
is not flexible
Check and repair or replace safety valve
7. Cylinder head studs of air compressor is
loose or cylinder gasket leaks
Tightly screw cylinder head studs or replace
cylinder gasket
Cause
Remedies
1. Impurity between brake valve core rod
end face and valve
Clean valve seat, remove impurity
2. Valve seat ground or damaged
Repair or replace valve seat
Cause
Remedies
1. Exhaust clearance too small or no
clearance
Adjusting bolt wound out to increase
clearance, exhaust clearance should be
among 1.5-2mm
2. Balance spring not suitably mounted
Remount balance spring
56
7. Electrical system
1) Starter
2) Generator
Cause
Remedies
1. Starter is out of running
⑴
Connecting wire broken or poor contact
of connecting wire
Weld or tighten the nuts on contacts
⑵
Low voltage of battery
Recharge or replace battery
⑶
Poor contact of brush and commutator
Clean surface of commutator or replace
brush
⑷
Inner short or broken circuit of starter
Repair after checking
2. Starter can run idle, but fails to start
engine
⑴
Poor contact of brush and commutator
Clean commutator contact face
⑵
Surface of commutator burned out or
stained with oil dust
Repair it well with abrasive cloth or clean oil
dust out
⑶
Poor contact of connectors
Clean or tightly screw contact point
⑷
Poor contact of solenoid switch
Check and repair solenoid switch
⑸
Battery insufficient or voltage too low
⑸
Recharge battery after checking
3. Starter runs with starting pinion
unmeshed and pinions knocked at each
other. Too small travel of armature
Screw the connecting screw of armature in
for 2-3 rings
Cause
Remedies
1. Generator fails to generate current
⑴
Connecting wires loose, broken, short
circuit or wrongly connected
Repair well after checking
⑵
Diode damaged, wires broken or have
short circuit
Replace it or repair it
⑶
Winding of rotor or stator broken, have
short circuit or earthing
Repair or replace
⑷
Regulated voltage of regulator too low
Adjust the voltage a bit higher
⑸
Regulator terminal burnt out or inside
wiring connector broken
Check and repair
2. Insufficient output power of generator
⑴
Coils of stator and rotor part short
circuit or broken
Repair or replace
57
Cause
Remedies
⑵
Each or both of the diode damaged
Replace
⑶
Generator belt too loose
Adjust to tighten belt
3. Unsteady current
⑴
Generator belt slips
Remove oil dust or adjust belt tension
⑵
Poor contact of recharged circuit
Check and remove
⑶
Coil of stator and rotor will be in short
circuit or broken circuit
Repair or replace
⑷
Breakdowns of regulator
Repair or replace
4. Abnormal noise of generator
⑴
Improper mount of generator,
interference between rotating part and
fixing part
Find out interference,adjust mounting
position
⑵
Bearing damaged
Replace bearing
⑶
Rotor knocking against stator
Repair
5. Burnt smell of generator
⑴
Damaged diode cause one fase or two
fases burnt
Replace
⑵
Stator knocking against rotor core and
burned and cause short circuit of winding
of stator and rotor coil
Repair or replace coil
⑶
Ineffective regulator or too high of
regulated voltage, overloaded for a long
time
Replace or adjust
6.Charged current too big
⑴
Inner short circuit of single grille of
battery
Replace
⑵
Too high regulated voltage of regulator
Adjust lower
⑶
Poor earthing of regulator
Check and repair
⑷
Regulator terminal ineffective and dirty
Repair and clean
58
3) Battery
Cause
Remedies
1. Frequently insufficient electric power
⑴
Breakdowns of generator or regulator
or no charging electric current
Repair generator or regulator
⑵
Loosened connecting wires of charging
circuit or rust making resistance increase
⑵
Check to see whether terminals and bolts
of connecting wires are loose or not and
tighten them, or remove rust
⑶
Short circuit of plate
⑶
Check and repair
2. Automatically discharging of battery,
too high impurity content of plate material
or impure electrolyte
2. Completely discharge battery or
overdischarge battery to make plate
impurity enter electrolyte then pour
electrolyte out and clean with distilled water,
and refill with new electrolyte and recharge
3. Charge capacity of battery distinctively
reduces (low discharging voltage, high
charging voltage, low indensity of
electrolyte and plates sulphurized)
⑴
Frequently insufficient electric power
⑴
Charge for a long time with small electric
current or completely charge and completely
discharge repeatedly
⑵
Discharge in small electric current for a
long time and not charging in time
⑵
Make activated material restore. Or
charge with sulphre removal method
⑶
Too low of electrolyte lever, upper part
of plate emerging from electrolyte lever
⑶
Replenish electrolyte
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