Yamaha F150A - Troubleshooting the Lower Unit

4-17
Outboard motor troubleshooting
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A
Symptom 1: PTT unit does not hold the outboard motor up.
Troubleshooting the lower unit
Troubleshooting consists of the following 3 items:
Symptom 1: Specific trouble conditions
Symptom 2: Trouble conditions of an area or individual part
Cause: Trouble causes of symptom 2
— : Not applicable
Symptom 1: Shift mechanism of the forward gear and reverse gear does not operate prop-
erly.
Symptom 2 Cause Checking steps
See
page
PTT fluid pressure does
not increase
Manual valve open Check the manual valve. 9-60
Insufficient PTT fluid Add sufficient PTT fluid. 10-14
— Check the hydraulic pressure. 9-35
PTT fluid leakage Check the PTT fluid leakage. 10-14
Clogged fluid passages
Disassemble and check the PTT unit.
9-41
9-48
9-54
Check the valves for damage.
9-41
9-54
Check the fluid passages for obstruc-
tions.
2-19
Symptom 2 Cause Checking steps
See
page
—
Shift cable is not adjusted
properly.
Adjust the shift cable. 3-9
Shift rod does not operate
properly.
Check the shift rod for wear. 8-11
Check the detent mechanism.
8-17
9-1
—
Shift mechanism malfunction
(in lower unit)
Check the shift rod connection. 8-27
Check the dog clutch and related parts. 8-13
Check the forward gear, reverse gear,
and pinion for damage and wear.
8-16
8-22
8-22