Mercury 35/40HP 2 Cylinder Outboards Service Manual PN 90-42794--1, Page 199Get this manual
Control Valve Assembly and Valve Body and Gear Assembly NOTE: Control valve assembly and valve body and gear assembly ARE NOT repairable and must be replaced as an assemblyREMOVAL 1Remove pump from boat, as outlined in "Hydraulic Trim Pump Repair," preceding IMPORTANT: Clean outside of pump assembly with solvent and dry with compressed air to help prevent dirt from entering components during disassembly2RemoveFill" screw and drain oil from pump reservoir3Remove bolts and lift control valve assembly from valve bodyRetain a-rings
CLEANING Clean all parts thoroughly with solvent and dry with compressed ai rDO NOT use ragslint will cause valves to malfunction INSTALLATION
ACAUTION