Mercury Mariner 25HP 4-Stroke Outboard Service Manual 1997, Page 201Get this manual
TILT UP Reservoir and Feed Oil
Oil Under Pressure Return Oil
Pressure 50(H)OO psi
aElectric Molor -Trim Ram
cImpact Relief ValveShock PistonMemory PistonManifoldSuction Seat
nOil PumpUp Circuit Feed ValveShuttle ValveDown Pressure Regulating Valve