Cruisers Forum
 


Join CruisersForum Today

Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 21-12-2016, 03:10   #1
Registered User
 
Whitebread117's Avatar

Join Date: Sep 2014
Posts: 104
Repair or Replace Autohelm ST7000?

42' monohull, 28k lb displacement, cutaway forefoot shoal full keel, skeg rudder, center cockpit.

I bought the boat with a nonfunctional ST7000 quadrant mounted AP and a S4000 wheel mount unit. The 4000 is fine for motoring in calm water- it's useless in any kind of swell or under sail (heavy boat, likes 15kts + sailing).

The ST7000 head unit doesn't power up when power is applied. Before I spend too much time on it, is this unit new enough to be worth repair? I'm not in front of it now, just budgeting boat projects for the next couple months.

All I'm after is an AP that will hold a rock solid compass course in any reasonable sea state. We navigate with navionics and a couple tablets- I'm not looking for any AP interfacing. We're a power hungry boat with multiple charging means, so efficiency isn't highest priority.

So is a ST7000 worth repairing for an overweight 42' cruising monohull, or is there a better option for a simple robust AP?

(Wind vanes are out, no room to mount and no passages longer than 48 hours for now)

I like saving money, but I'm willing and able to pay for a better product if one is available.

Thanks!
__________________

__________________
<Insert Heavy Sarcasm Here>
Whitebread117 is offline   Reply With Quote
Old 21-12-2016, 04:47   #2
Senior Cruiser
 
GordMay's Avatar

Cruisers Forum Supporter

Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 34,556
Images: 240
Re: Repair or Replace Autohelm ST7000?

FWIW:
Here’s the Service Manual (/w Schematics & etc)➥ http://www.olajedatos.com/documentos...ice_manual.pdf
__________________

__________________
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"



GordMay is offline   Reply With Quote
Old 21-12-2016, 05:13   #3
Registered User

Join Date: Jan 2014
Location: Panama City FL
Boat: Island Packet 32 Keel/CB
Posts: 398
Re: Repair or Replace Autohelm ST7000?

I would first check out the 7000 actuator. Basically it is a DC motor connected through an electric clutch and gear box to the rudder drive.

Disconnect the drive connector/ cable and apply 12 Volts to the two motor leads. If you hear it turning then reverse the polarity and see if it runs in the opposite direction. Next apply 12 V to the clutch and see if it engages. If this passes try engaging clutch and applying power to the motor. The rudder should rotate but be careful about not driving the system into any mechanical stops. Your source of 12 Volt power should be via a 20 Amp fused/ breaker circuit.

If the actuator is working properly then might want to replace the front end with something newer. Don't think you are going to get Raymarine to help on repairing the old 7000 system.

This is all assuming that you have at least checked that the 7000 is getting 12 V power.
Frankly is offline   Reply With Quote
Old 24-12-2016, 10:15   #4
Registered User
 
ka4wja's Avatar

Join Date: May 2007
Location: Florida
Boat: Catalina 470
Posts: 2,265
Re: Repair or Replace Autohelm ST7000?

Whitebread,
1) First off, we don't know what boat you have, nor what year, nor where you are at, nor where the boat is at, nor where it was commissioned, nor what year the electronics were installed/commissioned, nor where they were done...
Nor, do we know if you've even got 12vdc powered to the autopilot??
And, while knowing that you won't have any passages more than 48hrs long, that can be vastly different heading along a benign coast, versus punching through some steep seas...
So...

So, all I can do is provide you with some generic advice / input...

So, here it is...
--- Repair your existing autopilot...



2) As for some details....
You need to find your autopilot....I assume it's an S3 (or S3G), or Type 400 (or 400G)???
The ST-7000 is the control head only, and the linear drive (Type 2 ???) is the part attached to your quadrant...
And, you need to see if it has 12vdc power???
And, whether the ST-7000 control head is wired to it correctly, and check for corroded / loose wiring of all the autopilot connections (or which there are many)...

The actual autopilot is called the "corepak" (sometimes called the "course computer"), and is the box that does all the work....it takes in your vessel's heading (from its external heading sensor), and your rudder's position (form your external rudder position sensor), and adjustments to your course, etc. (from your ST-7000 control head).....and calculates/adjusts your course accordingly, sending power to your linear drive attached to the quadrant....

Depending on the age of your Raymarine equipment, this could be an S3 (or S3G), or the smaller S2 (or S2G)....or even an older Model 400 (or 400G), or the smaller 100/150 ???

This is your autopilot....It's a black or gray box, about 8" - 10" long, 3" - 4" wide, and 1.5" thick....
It will have a heading sensor wired to it...and a rudder position sensor wired to it...
As well as the ST-7000 control head wired to it, and the linear drive wired to it...
(it may also have another "Sea Talk" data cable, and/or a NMEA data cable, for other instrument data and/or GPS position data...but, not necessarily...)



3) Once you find your autopilot and examine the wiring, confirm its powered properly, etc....then you can test/evaluate it, and pass on that info here to all of us (along with the details referred to above, in #1)...
And, then we can be of more help....



4) Back to your original question....
Quote:
Originally Posted by Whitebread117 View Post
All I'm after is an AP that will hold a rock solid compass course in any reasonable sea state. We navigate with navionics and a couple tablets- I'm not looking for any AP interfacing. We're a power hungry boat with multiple charging means, so efficiency isn't highest priority.

So is a ST7000 worth repairing for an overweight 42' cruising monohull, or is there a better option for a simple robust AP?

(Wind vanes are out, no room to mount and no passages longer than 48 hours for now)

I like saving money, but I'm willing and able to pay for a better product if one is available.
Yes, the autopilot you have (assuming we get it working) is a good unit, and it will certainly be able to hold you on-course in many sea states and even in heavy weather....
Nothing wrong with it at all!!

But, we don't know if it even has 12vdc to it yet...so what it will take to get it working??? Could be just replacing a fuse inside it??? or could be it's toast....
We just don't know yet....

{FYI, worst case, figure on $2000 to $2500 for new (or replacement) corepak.....best case, a dollar or two for a couple new fuses and/or wire terminals...}


Hope this helped??

Fair winds...

John
__________________
John, KA4WJA
s/v Annie Laurie, WDB6927
MMSI# 366933110
ka4wja is offline   Reply With Quote
Reply

Tags
autohelm, helm

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Wanted: Autohelm ST7000 Drive Motor quartersplash Electrical: Batteries, Generators & Solar 2 16-11-2009 20:34
Need: Autohelm st7000 Control Head quartersplash Classifieds Archive 4 08-06-2009 13:43
autohelm st7000 wiring issue bobelon Marine Electronics 1 31-03-2009 07:05
Wanted Autohelm ST7000 drive motor quartersplash Classifieds Archive 2 05-02-2009 16:58
Autohelm ST7000 markpj23 Marine Electronics 26 28-11-2008 14:03



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 22:22.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.