Nakayama MB9000 CLASSIC, Instructions Manual

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EN
Problem Possible cause Solution
The clutch fails to engage
Clutch lever malfunction Repair or replace
Clutch cable damage Replace
Clutch fork not in the right position Re-adjust the cable or replace the fork
Damage on the welding points between the fork
shaft and the arm base
Repair or replace
The fork pin is bent or broken Replace the fork pin
Malfunction of the friction piece Replace
Malfunction of the spring Replace
The friction piece fails to touch the bearing face of
the clutch cover
Add some adjustment pads to the back of the
bearing
Bearing is burnt in the clutch
Replace
Add oil into the gearbox
Clutch slippage
Damaged spring Replace
Fork shaft's failure to turn around freely causes the
fork to reset completely
Clean the combined face between positioning shaft
and pushing plate to make the fork move freely
Cable not positioned correctly Re-adjust the clutch cables
TROUBLESHOOTING OF THE CLUTCH
Problem Possible cause Solution
Failure to shift into fast, slow or neutral gear Bolts and nuts of the main shaft are loose
Dismount the bolts, cover of the keys at the back of the
main shaft, screw the round nuts tight, then fix back the
bolts and cover of the keys and screw them tight
Failure to shift to the right gear
Excess abrasion of the puller Replace the puller
Driving angle gear is loose Tighten the round nuts
Excess abrasion of the upper hole in the
connection piece of support arm
Replace the support arm assembly
Positioning spring inside the main shaft does
not function
Replace
Main shaft is moving, the gearbox body rear
cover tightening bolts are loose
Screw the bolts tight
Deformation of the shift bar Adjust the shift bar or replace it
Failure to shift into reverse gear
Abrasion of reversing fork
Re-adjust the cable of reversing shift
Replace the reversing fork
Malfunction of reversing cable
Re-adjust the cable
Replace the cable
The reversing shaft is loose Screw the bolts tight at the back of the reversing shaft
The reversing fork is blocked
Clean the combined face between reversing fork and
reversing pushing plate to make the fork move freely
The reversing gears do not reset
The loosening of reversing shaft causes the
gear to be blocked
Screw the bolts tight at the back of the reversing shaft.
Malfunction of spring of the reversing shaft Replace the spring
The reversing shaft is bent and deformed Replace the reversing shaft
The reversing shaft is loose
Rear bolts of reversing shaft are loose Screw the reversing shaft
The matching between reversing shaft and
gearbox body is too loose
Replace
TROUBLESHOOTING OF THE GEARBOX
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