Troubleshooting The Lower Unit - Yamaha F200B Service Manual

Symptom 1: PTT unit does not hold the outboard motor up.
Symptom 2
Decrease in PTT fluid
pressure in lower
chamber of PTT
cylinders

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
Manual valve open
Insufficient PTT fluid
PTT fluid leakage
Clogged or open fluid
passage
Cause
Shift cable is not adjusted
properly
Shift rod does not operate
properly
Shift mechanism malfunction
(in lower unit)
Outboard motor troubleshooting
Checking step
Check the manual valve.
Add sufficient PTT fluid.
Check the PTT fluid leakage.
Disassemble and check the PTT unit.
Check the valves for damage.
Check the fluid passages for
obstructions.
Checking step
Adjust the shift cable.
Check the shift rod for wear.
Check the dog clutch.
Check the forward gear, reverse gear,
and pinion for damage and wear.
See
page
9-40
10-14
10-15
9-50
9-56
9-53
9-50
9-56
4
See
page
3-8
8-9
9-1
8-17
8-17
8-26
8-74
8-83
4-26