Mercury 35/40HP 2 Cylinder Outboards Service Manual PN 90-42794--1, Page 275Get this manual
Power Trim System Reassembly ManifoldOil Pump Installation
POWER TRIM SYSTEM DESIGN IMPORTANT: Filter (Design system only) must be installed in trim cylinder with wider ridge of filter housing facing out
2Install check ball components (a) into manifold50839
3Hold check ball components in place using screwdriver (as shown)Connect manifold to trim cylinder