3. Troubleshooting
105
(I) Low clutch oil pressure (clutch slips)
(II) Overheating
(III) Abnormal noise
No. Cause and effect Countermeasure
1 Clogging of filter on suction side. Disassemble and clean.
2 Worn oil pump. Repair or replace.
3 Sticking of oil pressure adjustment valve. Repair or replace.
4 Damage or old oil pressure adjustment valve
spring.
Replace.
5 Damaged seal ring. Repair.
6 Incorrect positioning of forward/reverse
conversion valve.
Adjust.
7 Worn sliding parts of forward/reverse conversion
valve.
Replace.
8 Damaged O-ring, V-ring in oil pressure pipe. Replace.
9 Low speed valve handle slips. Adjust to correct position.
10 Poor assembly of low speed valve handle. Reassemble.
11 Insufficient oil. Check for oil leakage and replenish.
No. Cause and effect Countermeasure
1 Clutch slippage due to low oil pressure. Review (I-1, I-11).
2 Clutch slippage due to overloading. Reduce load.
3 Damaged bearing. Replace.
4 Too much oil. Check oil level and adjust.
5 Problem with oil cooler. Check water level and adjust.
6 Poor quality or inappropriate oil. Change oil.
7 Poor operation of low speed valve. Review manual.
No. Cause and effect Countermeasure
1 Excessive backlash of gear. Replace.
2 Damaged bearing. Replace.
3 Abnormal vibration. Eliminate dangerous rotation.
TROUBLE WITH MARINE GEAR
(I) Low clutch oil pressure
(clutch slips)
(III) Abnormal noise
(IV) Difficulty changing into forward,
neutral, and reverse
(V) Dragging
(VI) Abnormal lube
oil pressure
(II) Overheating
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