Mercury 35/40HP 2 Cylinder Outboards Service Manual PN 90-42794--1, Page 160Get this manual
Troubleshooting Flow Chart (Continued) Outboard will not hold tilted position in reverse andor trails out during high speed deceleration with manual release valve lever in the lockrun (up) position ACAUTION
Tilt ram must be in fullup" position and accumulator removed before manual tilt system disassemblyInspect shock rod piston check valve(s) Results
Debris or defective components found in check valve(s)
Results
No debris or defective components found in check valve(s)Clean check valve(s) components using engine cleaner and compressed air or replaceInspect transfer valve(s)