Checking the Lower Unit(for Air Leakage)

1. Remove the check screw and then install the special service tool.lower unit

Pressure/Vacuum Tester: YB-35956-A

2. Apply the specified pressure to check whether the lower unit can hold it for at least 10 seconds.

Do not over pressurize the lower unit, otherwise the oil seals may be damaged.

Cover the check hole with a rag when removing the pressure/vacuum tester from the lower unit.

Lower Unit Holding Pressure: 70 kPa (0.7 kgf/cm2, 10 psi)

3. If pressure drops below specification, check the drive shaft and propeller shaft oil seals for damage.

Checking the Propeller

1. Check the propeller blades and splines for cracks, damage, or wear. Replace if necessary.propeller section

Checking the Anodes

1. Check the anodes and trim tab for scales, grease, or oil. Clean if necessary.Anodes

anodes and trim


Do not oil, grease, or paint the anodes, otherwise they will be ineffective.

2. Replace the anodes and trim tab if excessively eroded.

Checking the Battery

1. Check the battery electrolyte level. If the level is at or below the minimum level mark a, add distilled water until the level is between the maximum and minimum level marks.


2. Check the specific gravity of the electrolyte. Fully charge the battery if out of specification.

Battery electrolyte is dangerous; it contains sulfuric acid which is poisonous and highly caustic.
Always follow these preventive measures:

• Avoid bodily contact with electrolyte as it can cause severe burns or permanent eye injury.

• Wear protective eye gear when handling or working near batteries.

Antidote (EXTERNAL):

SKIN – Wash with water.
EYES – Flush with water for 15 minutes and get immediate medical attention.

Antidote (INTERNAL):

• Drink large quantities of water or milk followed with milk of magnesia, beaten egg, or vegetable oil. Get immediate medical attention.

Batteries generate explosive, hydrogen gas. Always follow these preventive measures:
• Charge batteries in a well-ventilated area.

• Keep batteries away from fire, sparks or open flames (e.g., welding equipment, lighted cigarettes).

DO NOT SMOKE when charging or handling batteries.



• Batteries vary per manufacturer. The procedures mentioned in this manual may not always apply, therefore, consult the instruction manual of the battery.

• Disconnect the black battery cable first, then the red battery cable.