Yamaha Marine Outboards Factory Service / Repair/ Workshop Manual 225G 250B L250B, Page 267Get this manual
RESERVOIR AND POWER TRIM AND TILT MOTOR (200H, 225GV200, V225)
(4) Connect the leads on the battery terminals in the down position until the power trim and tilt ram assemblies are fully compressed
(5) Connect the leads on the battery terminals in the up position until the power trim and tilt ram assemblies are fully extendedThen, measure the hydraulic pressureHydraulic pressure (with the power trim and tilt ram assemblies fully extended) 9.811.8 MPa (100120 kgcm2) (6) After measuring the hydraulic pressure, remove the special tools and quickly attach the down-relief valve attachmentHydraulic pressure gauge 90890-06776 Down-relief valve attachment5 90890-06774