Power Trim/Tilt Servicing
1. Mark angle adjusting rod location and remove rod.
2. Lift engine manually and engage tiIt/trail lock.
3. Remove blue and green wires from pump motor connector housing.
E] 4. Remove spring clip from tilt cylinder pin.
5. Remove tilt cylinder pin with punch and mallet.
6. Manually retract tilt cylinder. Remove three screws, port and starboard, holding the unit to the 'stern brackets.
E17. Remove trim/tilt unit, as shown, and pull control .cable through stern bracket.
Thoroughly clean unit before disassembling. Scrub all outside surfaces with a stiff bristle brush and hot soapy water. This will prevent dirt particles or other foreign matter from entering the unit while you are working on it.
Mount the unit on OMC Power Trim and Tilt Test Stand, P/N 390008. Place the unit and stand in a shallow tray to catch the hydraulic oil as it drains from the unit.
Neutralize the internal pressures of the power trim/tilt unit before disassembling. Using a battery, operate the unit until the trim and tilt cylinders are completely down. Reverse the connections on the battery and momentarily operate the unit.
There may be high pressure behind some check valves and in hydraulic lines. To prevent possible eye injury, when removing lines and check valves, be sure to keep a clean, "lint free” shop cloth covering them until the pressure is released. Use eye protection.
Do not apply heat to the trim manifold or cylinders. Excessive temperature can cause high pressure leaks or failure of parts.
Always use a "lint free” shop cloth when handling power trim and tilt components.
If painting the unit is required, paint the unit after it is completely assembled. Painting of individual components may cause flakes of paint to enter the hydraulic passages during assembly. Tape the trim and tilt rams before painting.
1. Be sure the manual release valve @ is screwed in all the way. Remove the retaining ring using OMC Retaining Ring Pliers, P/N 303857. Remove the manual release valve. 2. Inspect the O-ring in the manual release valve for nicks and cuts. Inspect the rubber tip © of the valve for tears or deformation. 3. Remove the oil level plug ® from the oil reservoir. 4. Inspect the O-ring on the reservoir plug. Replace the O-ring, if necessary. 5. Remove the two rigid steel lines connecting the top and bottom of the tilt cylinder to the manifold. When removing the line from the top of the tilt cylinder, you will have to hold the tilt cylinder band nut with one wrench while removing the line connector with another. 6. Both hydraulic lines have O-rings at each end. Inspect all four O-rings and replace O-rings if necessary. 7. Position the unit as shown. Slide the tilt cylinder retaining pin ® out of the unit. Remove the tilt cylinder. Very carefully and slowly, cycle the cylinder once or twice while aiming the oil feed ports down toward the oil drain pan. Remove the two nylon bushings from the cylinder. 8. Currently, there are two styles of tilt cylinders. Identify which one you have prior to making any repairs or selecting replacement parts. The cylinder shown at the top of the figure is referred to as the Showa brand cylinder. The cylinder shown at the bottom of the figure is referred to as the Presto/ite brand cylinder. When replacing an entire cylinder, either one can be used. When replacing individual parts including the band and band nut, only those specified in the parts catalog for that particular brand must be used.