241 

 

No. 175 Normally when driving straightly, but with abnormal sound while turning   

Malfunction  

Causes 

Solution  

Wheel abraded with body parts while turning;   

Check wheel is abraded with body parts while turning; if 
so, adjust and repair it;   

Outer cage of two front wheels without lubricating 
oil or damaged;   

Check outer cage of two front wheels are with 
lubricating oil or damaged;   

Pressure bearing lack of lubricating oil or 
damaged;  

Check pressure bearing is lack of lubricating oil or 
damaged; if so, lubricate or replace it;   

Normally when 
driving straightly, 
but with abnormal 
sound while 
turning 

Thrust bearing of slide column lack of lubricating 
oil or with damaged ball;   

Lubricate or replace thrust bearing of slide column; 

 

Normally when driving straightly, but 
with unusual noise while turning 

Adjust and repair 

Wheel abraded with body parts while turning 

Outer cage of two front wheels without lubricating 
oil or damaged 

Fill up oil or replace 

Lubricate or 
replace 

Pressure bearing lack of lubricating oil or 
damaged 

Abnormal 

Abnormal 

Oil leaking 

Normal 

Normal 

 
 

 

 

242 

 

No. 176 Braking wandering   

Malfunction Causes 

Solution 

 

(1) Materials for friction disk of brake shoe of left, right 
wheels not the same or degree of new, old not the 
same;  

Replace brake disk and brake drum   

(2) Closing area, position of friction disc of brake shoe 
and brake drum (disk) of left, right wheels not the same 
or braking clearance not the same;   

Adjust the clearance   

(3) Technical conditions for left, right wheel cylinders not 
the same, causing different action time or opening size; 

Replace left, right wheel cylinders   

(4) Pulling force of release spring of brake shoe of left, 
right wheels not the same;   

Replace release spring of brake shoe   

(5) Tire of left, right wheels with different pressure, 
different diameter, different pattern, or different pattern 
depth;  

Adjust tire, and charge the tire   

(6) Brake drum of left, right wheels with different 
thickness, diameter, extent deformation, and roughness 
of working surface;   

Replace brake drums of left, right wheels 

(7) Brake pipe at single side collapsed, blocked or oil 
leaking;  

Clean brake oil pipe 

(8) Brake pipe at single side or wheel cylinder with air 
resistance;  

Replace brake oil   

(9) Brake shoe at single side and support pin closely 
matched or rusty;   

Adjust clearance of brake shoe or remove 
dust  

While braking, wandering 
occurs to driving direction; 
while emergency braking, 
swerving occurs. 

(10) Frame, axle bent within horizontal plane, and 
wheelbase at two sides of frame unequal, or rigidity of 
front plate spring unequal.   

Adjust frame, wheelbase or replace spring 

 

 
 

 

 

243 

 

 

 

 
 

 

 

244 

 

No. 177 Braking dragging 

Malfunction  

Causes 

Solution  

(1) Brake pedal without free stroke;   

Adjust free stroke of brake pedal   

(2) Matching between brake pedal and other axles lack of 
oil, rusty, or release spring of pedal falls out, snapped off, 
or with too small pulling force, etc.;   

Apply oil, remove dust, or solve other 
problems accordingly;   

(3) Release spring of master cylinder piston ruptured or 
with too small pretightening force;   

Replace release spring of master cylinder 
piston;  

(4) Master cylinder piston, leather cup with too large length 
or leather cup bloating, sticking;   

Replace master cylinder piston, leather cup 

(5) Compensation hole of master cylinder obstructed by 
pollutants;  

Clean pollutants;   

(6) Leather cup of wheel cylinder bloating, sticking, or 
piston blocking;   

Replace wheel cylinder leather cup   

(7) Release spring of brake shoe falling out, snapped off or 
with too small pulling force; 

Replace release spring of brake shoe;   

(8) Brake shoe and support pin rusty;   

Repair brake shoe and support pin;   

(9) clearance between brake shoe and brake drum (disk) 
incorrectly adjusted; after releasing brake, local abrasion 
still exists;   

Adjust clearance between brake shoe and 
brake drum (disk);   

(10) Oil pipe through wheel cylinder collapsed or 
obstructed;  

Clean oil pipe of wheel cylinder   

(11) While not braking, center hole of auxiliary cylinder 
piston of supercharger could not be opened;   

Repair center hole of auxiliary cylinder 
piston of supercharger   

(12) Brake hose distorted, deformed or partially obstructed  Replace brake hose   

After releasing brake 
pedal, braking actions 
on individual or all 
wheels could not be 
fully released, thus 
affecting re-startup, 
accelerating driving or 
free running of 
vehicles. 

(13) Hub bearing loosening;   

Fasten hub bearing