1990 Johnson Evinrude 120 thru 140, 185 thru 225, 300 HP, P/N 507875, Page 412Get this manual
TroubleshootingGauge Set PIN 390010 The OMC Pressure Gauge Set PN 390010 allows external verification of trimtilt operation and component condition The A" adapter checks operation of the UP circuit and all components listed on Page 10-6 The "B" adapter checks operation of the DOWN circuit and all components listed on Page 10-7Tests must be made with the hydraulic unit removed from the engine and mounted in OMC Test Stand PN 390008O-rings on end of adapters can wear out during normal useUse O-ring PIN 332930 as replacementUse an adhesive such as Loctite Black Max or Dupont Krazy Glue to secure the O-ring to tip1Install hydraulic unit in OMC Test Stand PIN 390008