Yanmar 3YM30 Sevice Manual page 69

TROUBLE AND TROUBLESHOOTING
(I-1) Lap.
(I-2) Replace.
(I) Faulty operation of injection valve
(1) Impediment to valve
needle movement
(2) Damaged valve spring
(1) Damaged governor bearing
(2) Faulty operation
of governor link
(III) Faulty operation of governor
(III-1) Replace.
(III-2) Adjust.
(III-3) Clean.
(III-4) Disassemble, wash and repair.
(1) Faulty operation of
fuel pump plunger
(2) Damaged fuel pump plunger
(3) Damaged plunger spring
(4) Inaccurate assembly of fuel injection pump
(3) Sticking of governor sleeve
(4) Faulty operation of
fuel oil adjustment
(II-1) Clean.
(II-2) Replace.
(II-3) Replace.
(II-4) Correctly install pump.
(II-5) Clean.
(II-6) Replace.
(II) Uneven supply of fuel oil injected
(5) Clogging of fuel filter
(6) Damaged fuel cam
(7) Air in fuel injection system
(8) Faulty operation of adjustment rack
(9) Uneven amount of fuel to cylinders
(1) Overloading
(2) Seizure of moving parts
(3) Clutch slippage
(IV) Miscellaneous
(IV-1) Reduce load.
(IV-2) Disassemble, check and repair.
(IV-3) Check and adjust.
Chart 5
ROTATION IS NOT SMOOTH
(II-7) Bleed air and prime.
(II-8) Adjust.
(II-9) Adjust.
ROTATION IS NOT
SMOOTH