ST7002 Autopilot
While we were in the Amazon Delta last month our ST7002 autopilot quit working. The unit made a loud grating noise - it sounded like spinning gears which were not fully engaged. The fly in the ointment is that the unit started out life as an Autohelm 7000. We have replaced the control head, but the computer and the type 2 long linear drive unit are the original Autohelm components. We think that the unit was manufactured around 1991 - this is based on the motor label which indicates DATE 2/90.

I dismounted and opened up the linear drive unit. The inside of the linear drive unit had a large amount of black dust - it appeared to be brush carbon, but could have come from the black plastic gears. The drive belt (300 3M 12 469D) had some wear, but it appeared to be in serviceable condition. I disassembled and inspected the components. I connected a source of 12VDC to the motor - it ran fast and smooth. The resistance between the leads of the motor is .6 ohms (measured with a Fluke Model 23 Series II digital multimeterI). I connected the 12VDC source to the clutch coil and it had a strong magnetic field. The resistance of the clutch coil is 27.3 ohms. The clutch coil seems free to slide axially on its mounting pin. Both the small motor drive gear, and the large belt driven gear on the drive shaft seem to be serviceable. When I pull the tiller arm in and out, the planetary gear unit rotates freely. However, there is quite a radial wobble in the 4 planetary gears, which allows the clutch top / planetary gear housing to have a radial wobble.

I removed the circlip on the shaft end and pulled the steel clutch plate / plastic drive gear assembly. Both the shaft bushing and the plastic ring gear teeth on the clutch appear to be serviceable. I removed the roll pin securing the brass planetary gear base to the output shaft. The wobble in the planetary gears is as a result of excessive wear of the small drive gear which engages the 4 pinion gears. The planetary gears do not seem to be excessively worn.

I called the Raymarine Technical Department and spoke with Mark - he was quite helpful. He told me that the problem was that parts are not available for units built before 1989. The motor-side of the baseplate has a three box label with the following numbers: (upper two boxes) 2029 and 12V, (the lower box) 400004. There is a label on the FRACMO motor (serial 3666/366) with "DATE 2/90" - which indicates that if the motor was manufactured in February 1990, then this unit was built sometime after that date. Attached are 10 photos for ID purposes.

Mark told me to set up an account on this forum and post the information I had so that the folks in England can try to establish the date of manufacture for this unit. Then we can order the correct replacement parts. It is my understanding that there is a bronze gear replacement kit to upgrade the plastic gears. I would like to not only replace the broken components, but anything else you think we need to do. We are headed for the Panama Canal, and it is a long way across the South Pacific. I started out my career in the US Navy as an electronics technician, so with some guidance and the needed repair parts, we ought to be able to repair the unit.
Warm regards,
Tom Service
S/V Tiger Lilly
Spanish Waters, Curacao

Views: 289


Reply to This

Replies to This Discussion

I apologize for the delay, wanted to speak with our linear drive technician about your issue.

He explained that you will need planetary gear kit N021, this will come with the brass gears. He also suggested due to the age of the motor, he would recommend a new motor, and keep as a spare in case you get into any issues in the future, motor part number N002.

Are the part numbers the same for a type 1 linear drive?

I am the wrong guy to answer your question. I am just another boat owner who needed information from Raymarine.
You need to open a separate topic, and wait for the Raymarine technical wizzard (Underway - Raymarine, US) to answer you. It took them a couple of days to get back to me.
If you do take the same brass gear kit (N021), and you are in the Caribbean, Budget Marine carries these parts.
Tom Service
S/V Tiger Lilly
Spanish Waters, Curacao, N.A.

Rodney Kidd said:

Are the part numbers the same for a type 1 linear drive?

The brass gear kit is the same, N021.  The motor part number is different, for the Type 1 the part number is N001.

Reply to Discussion




  • Add Videos
  • View All


  • Add Photos
  • View All

Latest Activity

John Salley replied to John Salley's discussion Mast mounting RD418HD, interfacing to C90W
"Thanks. The cable length from the mast mounted radomes to the base of the mast is 22', or 7m. There is no room in the wiring chase to coil and store the excess of a 10m cable; obviously, a 5 and a 2.5 connected together would give about the…"
2 hours ago
Luiz Fontes replied to André Cavallari's discussion Autohelm2000
"[I'm not sure if it's against the rules of this forum to write in another language, since the author of this topic speaks my language and I can see you guys are having a hard time trying to communicate, I will answer him in Portuguese.…"
3 hours ago
Luiz Fontes replied to Luiz Fontes's discussion Wifi IP Cameras with Wifi capable chartploters
"I'm glad you guys are already working on such a nice feature. Thank you for the support!!"
4 hours ago
André Cavallari replied to André Cavallari's discussion Autohelm2000
"as he said I own the autohelm2000 but want to buy a gps that can be integrated to it and thus control the pilot . also do not like to spend much money on it that way MSIs want a cheap equipment . not quite understand when you said that you need an…"
5 hours ago
Profile IconMaximiliano Stachelski, Ian Smith, Ken Kaye and 16 more joined Raymarine Technical Forum
5 hours ago
Scott Gressin posted a discussion

FIsh Finder Freeze up

Was fishing few days ago. All electronics were up and running well for over an hour on the cruise to the spot.  Once on site and trolling my fish finder froze up.  Best way to describe this would be like when your desktop just stops responding.  No scrolling of data, the depth stayed constant, couldn't use several of the soft keys.I pulled up the fish finder data on the other unit E120 and it too was frozen.  This would be the case for anywhere from 30 secs to several minutes.  The system would…See More
5 hours ago
Gary Holzinger posted a discussion

NMEA 0183 wind data

Hi,I've just purchased a NMEA 0183 ultrasonic wind transducer (with 3 axis heading and GPS). I would like to integrate this data into my Raymarine system and have a couple of questions.1. Will my S3G autopilot steer off the wind and heading data provided over NMEA 0183?2. Will the autopilot then send this wind and heading data over Seatalk?3. Will I be able to then display wind speed and a direction pointer using a ST60, ST290 or similar Seatalk instrument?Thanks much!See More
5 hours ago
Mike Cole posted a discussion


The connection pins on the back of my Dragonfly GPS are broken, is this something that can be repaired. If so approximately how much will it cost?See More
5 hours ago
Moderator - Raymarine, US replied to ian marshall's discussion Position output to DSC VHF radio
"Welcome to the Raymarine Technical Forum Ian, Please note that the E-Series Classic MFDs do not support multiple data sources.  The 200WX creates a second source of GPS and heading data within your system.  It is recommended that you test…"
5 hours ago
ian marshall posted a discussion

Position output to DSC VHF radio

Last winter i installed an ACU400 autopilot, an EV01 heading sensor, two I70, one P70R, and a RS130 GPS. This was all linked up to my existing E120 classic, a DST800 and an Airmar 200wx wind sensor.I installed a new Seatalk backbone and had two STNG convertors, one to provide position to my Uniden VHF and one to talk to my autopilot wireless basestation.Everything has worked very well with one exception. The radio initially gets a position and the STNG convertor flashes the correct lights but…See More
6 hours ago
Dave Ungless posted a discussion

Wind and speed information disappearing...

I am experiencing an intermittent but worrying problem with disappearing wind and speed information. My i60 Wind displays a series of dashes for True Wind speed but Apparent Wind, direction etc is fine. At the same time, my speed reading on my i50 Tri Data unit displays a series of dashes and Speed disappears completely from my Raytheon ST60 Multi display.The transducers for wind and speed are the original ones connected to my ST60 displays replaced six months ago. Everything has worked fine…See More
6 hours ago
Eric Connelly posted a discussion

215 vhf mic

Hi, new the forum here and I've tried searching without any good results regarding a vhf mic.  I've just purchased a vessel missing the handset/mic to a 215 VHF radio.  Obviously this model has been discontinued as the vessel is 9 years old.  While I've located the part number (r49015), finding it is a different story.  However, I have found a mic to the Ray53 VHF that appears to be the same part. Can anyone tell me if the mic off of an old Ray53 will fit the 215?  They appear to be the same…See More
6 hours ago
Moderator - Raymarine, US replied to Roko's discussion No bottom at all with E120s, CP300, and B164
"Roko, Please verify that you have performed the following, particularly the recommendations for TVG, Gain,and Color Gain. FOR VERSION 3 AND EARLIER CP300 AND CP450C SOFTWARE: Set TVG=100%, Gain=50%, Colour Gain=15% Referring to the…"
6 hours ago
Roko replied to Roko's discussion No bottom at all with E120s, CP300, and B164
"4-8 feet below xducer depending on season and tide"
6 hours ago
Neddie Seagoon - Raymarine AU commented on Neddie Seagoon - Raymarine AU's blog post Manually tuning the CP450C chirp sounder
"A slight update to the above, partly to take into account the change in TVG operation that took place when we upgraded the CP300 and CP450C's software to v4. The process is still basically identical, but the direction in which TVG operates has…"
6 hours ago
Moderator - Raymarine, US replied to Roko's discussion No bottom at all with E120s, CP300, and B164
"Roko, How deep is the water below the transducer?"
7 hours ago

© 2014   Created by Moderator - Raymarine, US.   Powered by

Badges  |  Report an Issue  |  Terms of Service