[CA] [CA11] Type 3 Hydraulic Drive Thermal Overload

[Chuck - Raymarine - Moderator]

Welcome to the Raymarine Forum rkupsaw,

Q. Does the M81122 Type 3 hydraulic pump have a self-resetting thermal overload shutoff.
A. Raymarine drive units are not designed with a thermal overload shutoff. Instead, as drive units heat up, they tend to draw more power, which in turn will cause an over-current alarm to be triggered by the autopilot's Actuator Control Unit (ACU) / course computer. When such an event occurs, the autopilot's control head will alarm and provide a corresponding message. At that time, the autopilot will revert to Standby mode. Should no over-current alarm have been sounded, then it would be recommended the motor wires and connections / splices from the ACU / course computer through to the pump itself be inspected for corrosion or damage and to ensure that all connections are tight and promote good electrical continuity.