No
Yes
Yes No
Symptom: Transmission jumps of gear Diagnosis procedures
Symptom: Hydraulic disc brake fails Diagnosis procedures
Transmission jumps of gear
Yes
Yes
Yes
No
No
No
1. Check if fork hole and fork shaft are over
worn; 2. Check if matching clearance
between fork pin and cam groove of shift
gear shaft is big. 3. Check if transmission is
correctly installed.
Check if meshing end of cam pawl on end face of meshing gear is worn or
forms great roundness; and if corresponding gear end groove is worn or like a
horn mouth.
Check if shift fork is over worn or distorted.
Replace
gear
Check if spline gear of main shaft
and counter shaft, or spline
groove of sliding gear is over
worn.
Replace fork.
Check if spring of position wheel is broken or of insufficient elasticity.
Replace
Disassemble crankcase and check if meshing depth of each gear meets requirement.
Enough meshing depth Insufficient meshing depth
Hydraulic disc brake fails
Check brake liquid level in the liquid tank of main brake pump
Brake liquid level is lower than lower limit line of tank. Brake liquid level is higher than lower limit line of tank.
Refill brake liquid to
the upper limit line of
tank, meantime,
check if oil leaks at
brake caliper, brake
hose and hose
connector.
If there is sponge-like feeling while operating brake handle.
Air contained in the
hydraulic brake system.
Check if brake shoe has been worn to the limit mark and brake disc is over worn.
Replace brake shoe
and brake disc.
1. Check if piston surface of main brake pump and cylinder wall surface are
over worn or injured; 2.Check if piston cup of main brake pump is damaged,
cracked or aged; 3. Check if sealing ring of brake caliper is damaged,
cracked or aged; 4.Check if piston surface of brake caliper and cylinder wall
surface are over worn or injured.
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