Repair Service Manual

REPAIR MANUAL
1
KUBOTA Z402 and Z602 engines
REPAIR
Anomaly
Possible cause
Solution
The engine does
not start
No fuel
Fill up
Air in the supply circuit
Purge the air
Water in the supply circuit
Change the fuel and repair or change the
supply system
Clogged supply duct
Clean
Clogged fuel filter
Clean or change
Fuel or oil viscosity too high
Use the fuel or motor oil specified
Low hexadecane index fuel
Use the fuel specified
Fuel leak due to bad tightening of a
fastening nut on the injection duct
Tighten the nut
Bad injection timing
Adjust
Camshaft wear
Change
Clogged injector
Clean
Bad operation of the injection pump
Repair or change
Seized crankshaft, camshaft, piston,
cylinder jacket or main bearing
Repair or change
No compression in the cylinder
Change the cylinder head gasket, tighten
the cylinder head screw, change the glow
plug and injector holder
Bad timing
Readjust or change the timing gear
Worn piston rings and jacket
Change
Excess play in timing
Adjust
The starter is
inoperative
Battery discharged
Charge
Faulty starter operation
Repair or change
Faulty key switch
Repair or change
Wiring disconnected
Connect