2009 Yamaha F40 Outboard Service Manual, Page 91Get this manual
TRBL SHTG Symptom 2
Troubleshooting
Cause Checking step Check the manual valveAdd sufficient fluidCheck the PTT unit for leakageDisassemble and check the PTT unitCheck the filter for clog and dirtCheck the valves for damageCheck the fluid passage for clogCheck the gear pump operationRefer to page 9-59 10-13 10-13 9-50 9-56 9-54 9-54 9-50 9-54
PTT fluid pressure does Manual valve opened not increase Insufficient PTT fluid PTT fluid leakage Clogged fluid passage
Gear pump malfunction