Yanmar 3YM30 Sevice Manual page 68

TROUBLE AND TROUBLESHOOTING
(I-1) Disassemble and clean. (I-7) Replace.
(I-2) Repair or replace. (I-8) Replace.
(I-3) Repair or replace. (I-9) Adjust to correct position.
(I-4) Replace. (I-10) Reassemble.
(I-5) Repair. (I-11) Check for oil leakage
(I-6) Adjust.
(I) Low clutch oil pressure (clutch slips)
(1) Cogging of filter
(7) Worn sliding parts of
on suction side
(2) Worn oil pump
(3) Sticking of oil pressure
adjustment valve
(4) Damage or old oil pressure
adjustment valve spring
(5) Damaged seal ring
(6) Incorrect positioning of
forward/reverse conversion valve
(1) Damaged holding
spring of pipe
(3) Oil leakage where there
(4) Phase slippage
(IV) Difficulty changing into forward, neutral, and reverse
(IV-1) Replace.
(IV-2) Clean.
(IV-3) Replenish oil and check. Replace bellofrom.
(IV-4) Repair link system.
(II-1) Review (I-1, I-11).
(II-2) Reduce load.
(II-3) Replace.
(II-4) Check oil level and adjust.
(II-5) Check water level and adjust.
(II-6) Change oil.
and replenish.
(II-7) Review manual.
(1) Clutch slippage due
to low oil pressure
forward/reverse conversion valve
(2) Clutch slippage due
(8) Damaged O-ring,
to overloading
V-ring in oil pressure pipe
(9) Low speed valve handle slips
(3) Damaged bearing
(10) Poor assembly of low
speed valve handle
(11) Insufficient oil
(1) Not enough warp
(2) Foreign material
in steel plate
in pipe system
(2) Damaged holding
is remote control
spring of pipe
(V-1) Replace.
(V-2) Replace.
(V-3) Adjust lube oil adjustment valve.
(V-4) Change oil.
(II) Overheating
(5) Problem with
oil cooler
(6) Poor quality or
inappropriate oil
(7) Poor operation of
low speed valve
(4) Too much oil
(3) Lube oil pressure
is too high
(4) Viscosity of lube
oil is too high
(V) Dragging
Chart 4
TROUBLE WITH MARINE GEAR
(III -1) Replace.
(III -2) Replace.
(III -3) Eliminate dangerous rotation.
(III) Abnormal noise
(1) Excessive backlash
of gear
(2) Damaged bearing
(3) Abnormal vibration
TROUBLE WITH
MARINE GEAR
(1) Oil leakage
(3) Damaged or old lube oil
(2) Clogged lube
adjustment valve spring
oil filter
(4) Sticking of lube oil
adjustment valve
(VI) Abnormal lube oil pressure
(VI-1) Check and repair.
(VI-2) Disassemble and clean.
(VI-3) Replace.
(VI-4) Repair or replace.