Yamaha F350B - Troubleshooting the Lower Unit

4-30
Outboard motor troubleshooting
Symptom 1: PTT unit does not hold the outboard motor up.
Troubleshooting the lower unit
Symptom 1: Shift mechanism of the forward gear and reverse gear does not operate properly.
Symptom 2 Cause Checking steps
See
page
Decrease in PTT fluid
pressure in lower
chamber of PTT cylin-
ders
Open manual valve Check the manual valve. 9-32
Insufficient PTT fluid Add sufficient PTT fluid. 10-20
PTT fluid leakage Check for PTT fluid leakage. 10-20
Clogged or open fluid pas-
sage
Disassemble and check the PTT
unit.
9-42
9-47
Check the valves for damage. 9-44
Check the fluid passages for ob-
structions.
9-42
9-47
Symptom 2 Cause Checking steps
See
page
—
Shift rod does not operate
properly
Check the shift actuator operation. 5-26
Check the shift rod for wear. 8-12
Shift mechanism malfunc-
tion (in lower unit)
Check the shift rod connection. 8-12
Check the dog clutch. 8-20
Check the forward gear, reverse
gear, and pinion for damage and
wear.
8-29
8-20
8-29