Maintaining the Power Trim and Tilt System on a Yamaha Boat

Maintaining the Power Trim and Tilt System on a Yamaha Boat

The power trim/tilt system raises and lowers the motor for docking, mooring, beaching or trailering.trim tilt rod and screw list It's important to maintain the tilt system to avoid costly repairs, especially as the unit ages. The Yamaha Owner's Manual suggests a basic maintenance check every 20 hours, then 100 hours and annually for the life of the motor. It's easy enough to do, and most of the time it only involves a visual inspection and filling up hydraulic fluid.

Inspect the tilt rod for signs of wear, corrosion or damage.trim tilt rod and screw list If the rod shows any of these signs, replace it with a new one. Also inspect the rod lock for wear or abrasion. It's a small barrel-shaped connector on the end of the wire that looks like a bicycle spoke. It's supposed to release automatically when the motor is in neutral or forward gear but only lock in reverse. If it's not working as it should, adjust it by pivoting the trim rod up or down to move the connector to a different position on the wire.

Observe the power tilt gauge.trim tilt rod and screw list If the needle does not show center, the trim system is not functioning properly and should be adjusted by lowering the outboard against the trim limit rod and then rotating it to correct the reading on the gauge. Once the reading is corrected, retighten the two sending unit screws.

The hex-headed screw on top of the hydraulic reservoir can be hard to reach with the boat in the water, so it's a good idea to keep a flat blade screwdriver of appropriate blade size and length in your onboard tool kit to access this cap. This screw controls the maximum pressure in the system, and if it's not closed correctly it will allow air to enter the hydraulic system, usually causing the motor to fail to go up or slipping down after tilt-up.

Thoroughly clean the power tilt cylinder assembly before disassembling it, and use a lint free shop cloth to handle parts to prevent surface dirt from contaminating internal components. Thoroughly clean and wipe down the piston rod, and make sure there's no rust or corrosion on it, the bleed port and any other components in the system. If the piston rod is leaking, replace it with a new one.

Using a trim cylinder end cap remover/installer, P/N 436710 or Universal Spanner Wrench, P/N 912084 (small pins must be used in the spanner wrench) unscrew the piston rod and set it aside. Clean the rod O-ring and slide a new one on. Lubricate the rod nut and apply a liberal coating of threadlock or Loctite, then reinstall the nut and torque to 58 to 87 ft. lbs.

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