Post Reply 
 
Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
[CA] [CA11] Type 3 Hydraulic Drive Thermal Overload
04-04-20, 11:16 AM (This post was last modified: 04-06-20 09:43 AM by Chuck - Raymarine - Moderator.)
Post: #1
[CA11] Type 3 Hydraulic Drive Thermal Overload
Does the M81122 Type 3 hydraulic pump have a self-resetting thermal overload shutoff. Last summer I was on a 15 hour trip from Key West to Fort Myers FL (home). Two hours out of Fort Myers the hydraulic pump stopped working (the autopilot head worked fine just no pump response). I hand steered the last stretch but tried turning the autopilot back on several times with no pump response. A few days after I got back I went down to troubleshoot (?computer voltage output vs pump failure) and the system worked fine. It has continued to work fine on trips up to 3 hours. The pump is located in the starboard engine room of my sailcat. In the middle of the FL summer temperatures in the engine room are probably in the 110-120 degree Fahrenheit range (maybe higher). I've made several similar trips in the last 12 years without any problems. Is there a self-resetting thermal overload shutoff in the pump which could have accounted for this? If not has anyone dealt with a similar problem.
Find all posts by this user
Quote this message in a reply
04-06-20, 10:15 AM
Post: #2
RE: [CA11] Type 3 Hydraulic Drive Thermal Overload
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.
Find all posts by this user
Quote this message in a reply
04-06-20, 01:31 PM (This post was last modified: 04-06-20 02:06 PM by Chuck - Raymarine - Moderator.)
Post: #3
RE: [CA11] Type 3 Hydraulic Drive Thermal Overload
Thanks Raymarine.
Find all posts by this user
Quote this message in a reply
04-06-20, 02:07 PM
Post: #4
RE: [CA11] Type 3 Hydraulic Drive Thermal Overload
You're welcome.
Find all posts by this user
Quote this message in a reply
Post Reply 


Forum Jump:


User(s) browsing this thread: 1 Guest(s)