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rogerbum
Joined: 21 Nov 2004
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City/Region: Kenmore
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C-Dory Model: 255 Tomcat
Vessel Name: Meant to be
Photos: SeaDNA
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 Posted: Tue Sep 16, 2014 2:20 pm Post subject: Auto pilot only wants to go left |
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I've got a Raymarine ST6002 autpilot on the boat. During the season, it started out that it didn't quite hold the course well when it needed to turn to the right and eventually progress to not being able to turn right at all. Engaging the autopilot when things started going wrong would result in a slow drift to the left now it results in a rapid turn left.
I must admit I don't really understand how the pump for the autopilot is designed but I imagine that it is either:
A) two pumps (one to send fluid in either direction) that are electrically controlled or
B) one pump with switching valves or a reversing motor that control the direction of the hydraulic fluid.
ON EDIT: It appears that the standard pump is a reversing single pump.
Give the mode of failure, I don't think this is an electrical/control head failure but imagine that its a pump seal or valve issue. Any insight from those who have fixed or heard of a similar problem?
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Roger on Meant to be |
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Sea Wolf
Joined: 01 Nov 2003
Posts: 8650
City/Region: Redding
State or Province: CA
C-Dory Year: 1987
C-Dory Model: 22 Cruiser
Vessel Name: Sea Wolf
Photos: Sea Wolf
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| Posted: Tue Sep 16, 2014 2:41 pm Post subject: Re: Auto pilot only wants to go left |
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| rogerbum wrote: | I've got a Raymarine ST6002 autpilot on the boat. During the season, it started out that it didn't quite hold the course well when it needed to turn to the right and eventually progress to not being able to turn right at all. Engaging the autopilot when things started going wrong would result in a slow drift to the left now it results in a rapid turn left.
I must admit I don't really understand how the pump for the autopilot is designed but I imagine that it is either:
A) two pumps (one to send fluid in either direction) that are electrically controlled or
B) one pump with switching valves or a reversing motor that control the direction of the hydraulic fluid.
ON EDIT: It appears that the standard pump is a reversing single pump.
Give the mode of failure, I don't think this is an electrical/control head failure but imagine that its a pump seal or valve issue. Any insight from those who have fixed or heard of a similar problem? |
Roger- I'm unfamiliar with autopilots, but if the pump motor functions by reversing it's polarity, I'd disconnect the pump from the autopilot and test it's function to see if the problem is in the pump or the control unit. Connect 12v power to the disconnected leads to the pump in the two polarity modes, and see if the pump runs in both modes and if the fluid is pumped in opposite directions, reversing the steering of the slave cylinder. If all this works, then the problem must be in the control unit. If it's there, call the Raymarine tech. If it's in the pump, then call him anyway and see if it can be repaired or you need a new pump. Hope this is logical and helps! Good Luck!
Joe.  
P.S.: What happened to TyBoo's post? 
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Sea Wolf, C-Brat #31
Lake Shasta, California
  
"Most of my money I spent on boats and women. The rest I squandered'. " -Annonymous |
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BrentB
Joined: 15 Jul 2006
Posts: 4420
City/Region: Greenwood
State or Province: IN
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| Posted: Tue Sep 16, 2014 3:40 pm Post subject: |
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I glad no one but me thought the unit was becoming a Communist
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Brent Barrett |
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El and Bill
Joined: 08 Nov 2003
Posts: 3200
City/Region: Lakewood, CO
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C-Dory Year: 2000
C-Dory Model: 22 Cruiser
Vessel Name: Halcyon
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| Posted: Tue Sep 16, 2014 3:57 pm Post subject: |
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I thought it was a command from the Democrat Party - go left, young man.
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El and Bill (former live-aboards)
Halcyon 2000 CD 22 Bought 2000 Sold 2012
http://cruisingamerica-halcyondays.com/ |
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Discovery
Joined: 08 Dec 2003
Posts: 1245
City/Region: LOA, UTAH
State or Province: UT
C-Dory Year: 2006
C-Dory Model: 255 Tomcat
Vessel Name: Discovery
Photos: Discovery
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| Posted: Tue Sep 16, 2014 4:15 pm Post subject: |
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Check the position sensing cylinder, probably on the starboard motor steering ram. It may have come loose and is way off center.
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Brent and Dixie,
1984 22' Classic sold 2003
2003 24' TomCat sold 2005
2006 TC255 Discovery Sold 2020
2006 CD 22' Angler Sold 2014
https://share.delorme.com/FBrentBetenson
"Free men do not ask permission to bear arms." ~ Thomas Jefferson |
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starcrafttom
Joined: 07 Nov 2003
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C-Dory Year: 1984
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Vessel Name: to be decided later
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| Posted: Tue Sep 16, 2014 5:15 pm Post subject: |
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You must of got the NASCAR version. Stop shopping at bass pro shop.
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Thomas J Elliott
http://tomsfishinggear.blogspot.com/ |
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rogerbum
Joined: 21 Nov 2004
Posts: 5927
City/Region: Kenmore
State or Province: WA
C-Dory Year: 2008
C-Dory Model: 255 Tomcat
Vessel Name: Meant to be
Photos: SeaDNA
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| Posted: Tue Sep 16, 2014 6:12 pm Post subject: |
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| Discovery wrote: | | Check the position sensing cylinder, probably on the starboard motor steering ram. It may have come loose and is way off center. |
Brent - I must admit I have no idea of what that is or would look like. Googling that term (position sensing cylinder) wasn't very helpful. Can you describe this or post a picture? |
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redbaronace
Joined: 29 Aug 2012
Posts: 581
City/Region: Puget Sound
State or Province: WA
C-Dory Year: 2006
C-Dory Model: 255 Tomcat
Photos: redbaronace (Name TBD)
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| Posted: Tue Sep 16, 2014 7:10 pm Post subject: |
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| Discovery wrote: | | Check the position sensing cylinder, probably on the starboard motor steering ram. It may have come loose and is way off center. |
Can you explain what it looks like and what to look for as far as making adjustments to one. |
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ghone
Joined: 13 Aug 2008
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City/Region: Nanaimo
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C-Dory Year: 2011
C-Dory Model: 22 Cruiser
Vessel Name: Kerri On
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| Posted: Tue Sep 16, 2014 11:28 pm Post subject: |
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Given the vintage, it's a common issue to have a failure. It could be a lot of things from loose wire connections to a bad heading sensor or just for no good reason or hard to imagine, old age. Saw a few out of the box failures even
Raymarine may change out the motor for you. They are well aware they had some mfg issues in '06-'09.
I'd call their tech line and get it underway.
George |
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Discovery
Joined: 08 Dec 2003
Posts: 1245
City/Region: LOA, UTAH
State or Province: UT
C-Dory Year: 2006
C-Dory Model: 255 Tomcat
Vessel Name: Discovery
Photos: Discovery
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| Posted: Wed Sep 17, 2014 10:09 am Post subject: |
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The position indicating ram is the lower cylinder on the starboard motor in this pic. Held in place by the two stainless bands. It provides input to the autopilot to indicate whither the motor is pointed to the left, right, or straight ahead. It needs to be centered on the steering ram. I had a bad ram on our 24TC and the autopilot would only turn to port. |
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