Yamaha F400A 2022 - Page 207

Outboard motor troubleshooting
4-34
Symptom 1: PTT unit does not hold the outboard motor up.
PTT motor does not
operate
PTT motor malfunction Check the PTT motor. 9-52
Short, open, or loose con-
nection of the PTT motor
lead
Check for wiring continuity between
the PTT motor and the electrical
management box.
A-18
Electrical management box
malfunction
Check the electrical management
box.
A-18
Bent tilt ram or trim ram Check the tilt ram and trim ram. 9-62
Stuck tilt ram or trim ram
Disassemble and check the PTT
unit.
9-62
PTT fluid pressure
does not increase
Open manual valve Check the manual valve. 9-48
Insufficient PTT fluid Add sufficient PTT fluid. 10-20
PTT fluid leakage Check for PTT fluid leakage. 10-20
Clogged fluid passage
Disassemble and check the PTT
unit.
9-57
9-62
Check the filter for dirt and obstruc-
tions.
9-54
9-59
Check the valves for damage. 9-59
Check the fluid passages for ob-
structions.
9-57
9-62
PTT motor malfunction Check the PTT motor. 9-52
Gear pump malfunction Check the gear pump assembly. 9-59
Symptom 2 Cause Checking steps
See
page
Decrease in PTT fluid
pressure in lower
chamber of PTT cyl-
inders
Open manual valve Check the manual valve. 9-48
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.
9-57
9-62
Check the valves for damage. 9-59
Check the fluid passages for ob-
structions.
9-57
9-62
Symptom 2 Cause Checking steps
See
page