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  #1  
Old 01-01-2018, 02:05 PM
aero320 aero320 is offline
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Default Reparing my Minn Kota Terrova Trolling Motor

I have a 2012 24V 80 lb. thrust Minn Kota Terrova trolling motor with iPilot that started making some motor noise recently. I wanted to share with the group what I discovered when repairing the trolling motor myself.

I was slow trolling one afternoon and the trolling motor started making noise. I could actually feed vibration in the hull of the boat. Used the motor the rest of the trip.

Still have my previous trolling motor in the attic (Minn Koto Powerdrive 24v/80/Autopilot/co-pilot) so I got it down, put new batteries in the remote, plugged it into the boat, and it worked fine. Took quick trip to the lake for a lake test before I started working on the Terrova.

Wrote down the serial number and located the parts diagram on the Minn Kota website. Called Minn Kota and talked to a service person, very helpful. He said to check the prop and the prop shaft to see if it was bent. Not likely the problem since it started making noise in open water.

He suggested putting a new seal kit and see if that cured the problem. In the worst case scenario, you can buy a complete new motor with US2 and 60" shaft for less than $400. I knew, I could make that repair if necessary.

We talked about the possibility of having water in the motor and he indicated that even if there is some water, you can dry it out, replace the seals and it might be all right. Excessive water will cause the armature to short out and it will destroy the main board in the upper part of the trolling motor. This board is about $225. Since my trolling motor would still run, I figured the armature was OK.

It was time to remove the prop, shear pin, and the two bolts than hold the motor together. First, there was no water in the motor. There may have been some condensation at one time but did not appear to cause a problem. Could not get the red and black wires loose from the Brush block. The armature looked fine.

They sell a Brush Block kit that contains a new brush block (with brushes) all of the orings and seals that you will need along with the front bearing and various washers that are required. The kit was about $45 and included both the Red and Black wires connected to the Bush Block. This must be a common problem.

The Kit did not include the thrust bearing that goes at the rear of the motor so I wanted to replace that also. Minn Kota sells a rear motor housing (Terrovas's have the skeg on the rear of the motor housing) for about $22 and it includes all of the seals and thrust bearing already installed. So all I needed to purchase was the rear housing and the Brush Kit. Of course I did purchase a few parts that turned out redundant (not a lot of $$$).

The wires at the top of the motor all have connectors and are easy to disconnect. A single bolt holds the top part of the motor to the shaft and removing the bolt allows you to remove the top housing. The locking collar bolt on my Terrova had gotten rusty do I decided to replace it while everything was taken apart.

There are four wires that run from the motor unit through the shaft to the top of the motor. The Red and Black power wires that attach to the Brush Plate mentioned before. The trolling motor has the US2 transducer, so a transducer cable runs through the shaft. There is also a small brown grounding wire that attached to one of the bolts that attaches the brush plate. These wires were used to try prevent depthfinder interference.

With all of the parts that I would need on hand (plus a few bonus parts) I called Minn Kota one more time to get some advice about assembling the motor then began the task. I worried most about getting the brushes pulled back when the armature was inserted but that turned out to be fairly easy.

You basically run the wires though the shaft. You will need enough slack in wires to move the rear housing back about the width of a finger so that you can insert a screwdriver and push the brushes back so the clear the commutator. Once that has been done, there is a shield or clip that slides in between the magnets on the top side to keep the wires clear of the armature. The clip actually slides in from the front to the motor. You will also need to adjust the slack on the transducer cable before you slide the clip in. Not really a problem either.

The armature installs from the front and the magnets are very strong and will pull the armature into the motor housing. Watch where your fingers are when you do this. The magnets center the armature from front to back. You will need to reach into the small gap that you left for the brush plate with a screw driver and push the brushes back so they clear the commutator. This will allow you to slide the rear motor housing against the main motor housing. There is an Oring that fits in between the housing just as there is in the front section.

Slide the nose cone onto the front of the motor housing and get everything aligned. The easiest way I found to the those long screws aligned correctly was to place the motor vertically resting on the nose cone. That means the the long screw would also be vertical. There are two bosses that stick up from the nose cones that have the threaded holes for the screws. You can "feel" when the screws are resting on these bosses and that will help you get the long screws started in the holes.

After connecting everything back on the top end, I took the trolling motor over to the boat and plugged it into power. Took the iPilot remote over to see if the motor would rotate. On a Terrova, depressing the deploy lever will allow the motor to operate and the directional motor to turn. Every thing seemed to work so I installed the trolling motor back on to the boat and did a lake test. Everything works and the motor is quiet again!

Having said all of that, here are some additional observations. First, I though $400 for a new motor and shaft was a good deal so in the worst case scenario, that was my maximum exposure (plus shipping). By the way, according to Minn Kota, when you purchase and Ulterra motor or Terrova motor, the shaft is included. I think they are glued together rather than threaded.

Also, I was thinking about "What else could go wrong in the future" that is mechanical, and discovered that the little box at top that rotates the shaft is available as a complete unit. From the looks of the parts diagram, there is a drive motor and lots of gears and sleeves. The replacement cost for the entire unit is about $110. I thought that was also a good deal.

It is New Years Day and I wanted to share this trolling motor experience with fishingTN. Now if it would just warm up a little!
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  #2  
Old 01-01-2018, 02:29 PM
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tkwalker tkwalker is online now
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Smile Good Info . <'TK><

Thanks Aero for this Great info and tutorial.... I am sure it will be helpful for some of our members ... <'TK><
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  #3  
Old 01-01-2018, 03:15 PM
Jlg309 Jlg309 is offline
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Thanks for the tutorial!
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Old 01-03-2018, 07:44 AM
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Heiny57 Heiny57 is offline
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Thanks Aero, I have a Terrova and may need this sometime
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  #5  
Old 01-03-2018, 04:19 PM
bfish bfish is offline
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I just take mine to authorized repair person, John Swallows is local to me but usually is backlogged. Rick Swafford is up the road a bit, but also does good work and usually pretty quick.
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Old 01-03-2018, 08:54 PM
aero320 aero320 is offline
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Quote:
Originally Posted by bfish View Post
I just take mine to authorized repair person, John Swallows is local to me but usually is backlogged. Rick Swafford is up the road a bit, but also does good work and usually pretty quick.
By the time, I take the trolling motor to the repair center and drive back home, it burns up a day. Same when you pick it up. If you are still under warranty, your choices are limited.
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Old 01-03-2018, 08:57 PM
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XxthejuicexX XxthejuicexX is offline
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Aero yours sounds just like mine I've got a motor guide I have had to break down twice over the last 3 years. It will start making loud screaming noise from the lower unit. I took it apart, cleaned it and put it all back together, made it 2 years and started it again this summer, same thing done and it's been fine since. If I keep the boat I'm sure I will need to rebuild it in the near future.
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Old 01-03-2018, 09:39 PM
bfish bfish is offline
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Quote:
Originally Posted by aero320 View Post
By the time, I take the trolling motor to the repair center and drive back home, it burns up a day. Same when you pick it up. If you are still under warranty, your choices are limited.
Totally get what your sayingÖ

I believe both that I posted are authorized under warranty (and luckily less than 1 hour away from me). I keep my boat in a garage, that is not at my house. For me, bring all the tools over and open things up and put them back together takes almost as long as dropping it off elsewhere. If parts have to be ordered, rather than "off the shelf" with the repair guys, then I am saving time. Different strokes for different folks. Especially for this "hack" mechanic.
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Old 01-03-2018, 10:24 PM
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Alphahawk Alphahawk is offline
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Glad you could repair it. Repairing an Ulterra is not so easy. The cost for the motor with the shaft is probably a good deal.....other parts not so much. Mine was sent in twice under warranty. Those 2 times they used $2000 worth of parts. It is now doing same thing again.....warranty ran out in August. I can make it work...but it will eventually completely fail. I doubt I will send it in......I get a great discount on them so I will probably just get a Gen 2 model with the improved spot lock. Canít see spending a grand to fix it....plus whatever labor would be. Just put that money towards the Gen 2......sucks that I couldnít even get 3 years out of it.

Regards


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Old 01-04-2018, 12:03 PM
aero320 aero320 is offline
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Quote:
Originally Posted by Alphahawk View Post
Glad you could repair it. Repairing an Ulterra is not so easy. The cost for the motor with the shaft is probably a good deal.....other parts not so much. Mine was sent in twice under warranty. Those 2 times they used $2000 worth of parts. It is now doing same thing again.....warranty ran out in August. I can make it work...but it will eventually completely fail. I doubt I will send it in......I get a great discount on them so I will probably just get a Gen 2 model with the improved spot lock. Canít see spending a grand to fix it....plus whatever labor would be. Just put that money towards the Gen 2......sucks that I couldnít even get 3 years out of it.

Regards


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Alpha, I was one of the poor souls who purchased the Minn Kota Genesis about 15 years ago and I have never forgot that experience. For that reason, I would never purchase the Ulterra. Actually, I find the Terrova to be very adequate for my needs and very reliable as well. Actually, the Power Drive 2 with iPilot is all that I need but they don't offer it in 80 lbs. of thrust any longer. I believe the improved Spot Lock is part of the iPilot unit rather than the trolling motor. My Motorguide has a feature that allows you to move the boat five feet in any of the four directions but I can't say that has caught me any fish! Good luck.
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Old 01-04-2018, 06:27 PM
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Alphahawk Alphahawk is offline
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Quote:
Originally Posted by aero320 View Post
Alpha, I was one of the poor souls who purchased the Minn Kota Genesis about 15 years ago and I have never forgot that experience. For that reason, I would never purchase the Ulterra. Actually, I find the Terrova to be very adequate for my needs and very reliable as well. Actually, the Power Drive 2 with iPilot is all that I need but they don't offer it in 80 lbs. of thrust any longer. I believe the improved Spot Lock is part of the iPilot unit rather than the trolling motor. My Motorguide has a feature that allows you to move the boat five feet in any of the four directions but I can't say that has caught me any fish! Good luck.


Yeah I hear you......but the last thing I need is to go in the water lifting and raising a trolling motor. Bad knee....bad hip......overweight....but down 45 pounds in last 6 months and got another 70 to go....but will get there. It has been a love hate relationship with it. I will take another look at the Terrova now that it has lift assist.

Regards


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  #12  
Old 01-04-2018, 09:17 PM
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TnCreekMaster TnCreekMaster is offline
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Quote:
Originally Posted by Alphahawk View Post
Glad you could repair it. Repairing an Ulterra is not so easy. The cost for the motor with the shaft is probably a good deal.....other parts not so much. Mine was sent in twice under warranty. Those 2 times they used $2000 worth of parts. It is now doing same thing again.....warranty ran out in August. I can make it work...but it will eventually completely fail. I doubt I will send it in......I get a great discount on them so I will probably just get a Gen 2 model with the improved spot lock. Canít see spending a grand to fix it....plus whatever labor would be. Just put that money towards the Gen 2......sucks that I couldnít even get 3 years out of it.

Regards


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I feel the pain I have a love hate relationship with my terrova v1 but it looks like they got the bugs worked out with the v2, I've learned now never to buy a first model of a new trolling motor or fish finder because they obviously don't get it right the first time, congrats on the weight loss think of it like this, for every pound you loose thats .1mph faster you get to the crappie lol

Happy fishing
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