1990 Johnson Evinrude 120 thru 140, 185 thru 225, 300 HP, P/N 507875, Page 375Get this manual
Routine Maintenance
[!] 1Check reservoir fluid level at least once per season or every
50 operating hoursSystem capacity is approximately 37.2 oz(1100 cc) Engine temperature must be cold Engine must be in vertical position Do not thread dipstick into hole when checking level Add OMC Power TrimlTilt and Power Steering Fluid or GM Dexron I as necessary to bring level up to full mark on dipstickf2l 2Check belt tension and condition at least once per season or every 50 operating hours Replace the belt every 500 operating hours Refer to Belt Tension Procedure, this Section3Check the condition of all hydraulic hoses on regular basisInspect for: Wear or fatigue Loose fittings or leaks Chafing Misrouted or unsupported hoses 4Replace the oil filter