Autopilot hydraulic ram wont stop

[Johnty32]

Can anyone help me please,I just fitted two new hydraulic (type2)raymarine pumps to my system . Now when I activate auto on the head unit the ram goes all the way port or starboard and won't stop ! everything seems to be connected correctly and it all worked perfectly before the pumps broke down

[goboatingnow]

Sounds like a rudder reference problem , check the system and wiring


Dave

[GordMay]

Greetings and welcome aboard the CF, Johnty32.

[Paul L]

Have you re-done the Dockside installation setup on the AP?

[barnakiel]

Rams are limited by the software. The software uses input from the reference unit. Make sure the unit is there and aligned as per instructions. Do the dockside calibration and set the rudder limits right.

Then report on what happened.

It is bad for the whole thing if rams are allowed to go all the way. They are very powerful things and can bend or damage other connected parts.

b.

[Johnty32]

Thanks guys, do I have to re do all the settings even though nothing has changed except the pumps? I checked the settings and they seem the same. The rudder reference seems fine. Surely the gyro is the part that tells the core computer to stop the rams and how would I check the gyro

[r.furborough]

Maybe a polarity reversal on one or both of the pumps...

[r.furborough]

Originally Posted by r.furborough

Maybe a polarity reversal on one or both of the pumps...

Another thought, why 2 pumps...

[Lancerbye]

Sounds like you might have the two pumps wired backwards. If you have two independant pumps and one is enegized to go to starbord for example. being the wrong pump energized it will never arrive at the setpoint it is looking for since it is going in the wrong direction, getting it's feedback from the rudder angle transducer and will therefore drive the ram to the end of it's travel and will still be looking for a setpoint that will not happen. The pump will continue running. I have also seen this in single reversing pumps that have the wires reversed.

[Johnty32]

Well guys thanks for your input, Lancerbuy was correct , I reversed the polarity and everything worked fine, great to be able to access such knowledge
Thanks again

[Johnty32]

Sorry Lancerbye. For incorrect spelling