OILDYNE TRIM PUMP
SERVICE MANUAL NUMBER 28
90-863160 MAY 2000 Page 5A-5
Air Bleeding Power Trim System
1. The Power Trim System will purge itself of a small amount of air by raising and lowering
the sterndrive unit several times. However, if a rebuilt trim cylinder is being installed
(which has not been filled with oil), the bleeding procedure should be used to remove
the air from the system.
Bleeding OUT/UP Trim Circuit
1. Fill the pump reservoir to the proper level. The trim cylinder must be compressed.
2. Disconnect the OUT/UP hose from the front connection on the trim cylinder. If both cylin-
ders were rebuilt, disconnect the hoses from both cylinders.
3. Direct the end of the removed trim hoses into a container.
4. Run the trim pump in the OUT/UP direction until a solid, air-free stream of fluid is ex-
pelled from the hoses. Reconnect the hoses and tighten securely.
5. Refill the trim pump to the proper level.
50389
a
b
a-OUT/UP Trim Hose
b-Front Connection On Trim Cylinder
Bleeding IN/DOWN Trim Circuit
1. Ensure that the pump reservoir is filled to the proper level.
2. Disconnect the IN/DOWN hose from the rear connection on the gimbal housing hydrau-
lic connector. If both cylinders were rebuilt, disconnect the hoses from both sides of the
hydraulic connector.
3. Plug the holes in the hydraulic connector using plug (22-38609) or suitable device.
4. Direct the end of the trim hose into a container.
5. Run the trim pump in the OUT/UP direction until the trim cylinders are fully extended.
6. Remove the plugs from the gimbal housing hydraulic connector and briefly run the trim
pump in the IN/DOWN direction until a solid, air-free stream of fluid is expelled from the
rear holes in the hydraulic connector. Reconnect the trim hoses and tighten securely.
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