1990 Johnson Evinrude "ES" Cross V 88 thru 115, 150 thru 175, P/N 507874, Page 326Get this manual
Trim "OUT" Tilt "UP" Mode
When operating the hydraulic unit in the trimout"tilt "upmode, hydraulic fluid is routed in the following manner:
1Hydraulic pressure is directed to the trim check valve thepiston to open the reverse lock check valve
side of the pump control piston