I'm still troubleshooting an issue with my Lewmar bow thruster on my Ranger R23. I had a diver clean my boat recently and he removed about a 14" piece of line off of the prop. He spun the prop and it had resistance, it didn't spin freely, indicating that the shear pin is not sheared. When I hit the bow thruster switch at the helm I can hear the solenoid click but the motor does not spin. If the shear pin was broken and I had power to the motor I should hear the motor spinning. There's a 20 amp fuse off of the battery and it's good. I replaced it just for the heck of it. The battery is good from a voltage perspective. I haven't checked the current output yet. Is there anything else between the battery, fuse, and bow thruster motor that would prevent it from working? Perhaps a relay switch? I don't see a relay switch on the electrical diagram for the boat. I would think that if the 14" piece of line on the prop was an issue that that 20 amp fuse would have blown. Many thanks in advance to any suggestions.
Lewmar Bow Thruster
- Thread starter jdiianni
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jhammell62
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Check the ANL fuse. I have an R23 and it is located right next to the thruster main power disconnect. That failed on mine when the very poorly designed Lewmar 110 gearbox failed.
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Nickc
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If ANL fuse check is ok'' and your boat is stored out of water subject to freeze thaw... I would still suspect the faulty design 110TT Lewmar gear case cap closure cap popping off and causing gears to begin to bind up. If diver still available -- check to see if if black 1" cap is missing from bottom of gear case. If it is missing that might be all or part of problem-- there is history of those caps popping off. The prop will turn for a short time with increased friction until it totally freezes up and causes shear pin to fail. If cap is in place-check to see electric motor is spinning freely -with shear pin removed. (PSI have a photo of failed cap/gearcase-if interested)
jhammell62
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Here's a picture of what my 110 gearbox looked like when it failed. It's a really poor design. Like was mentioned, the plastic cap is the only barrier between the gearbox and saltwater.
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KKRCRACE
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When my 110 gear box failed the shear pin was fine. The gears and bushings due to salt water and lack of grease just wore out and gears became stripped. It didn’t lock up and cause a fuse to blow. Motor and shear pin were fine.
KKRCRACE
KKRCRACE
Nickc
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KKRCRACE... Interesting History of Lewmar 110TT Thruster failure modes...
mine sheared the pin immediately after launching boat in spring and electric motor spun freely... however when I finally able to schedule boat to be hauled... found that in addition to cap missing.. that I was able to turn prop... but much more force needed to be applied for prop to turn shaft..gears had not yet locked up but extra torque must have caused pin to shear.)Gears eventually seized up next day).
Note-In my recent discussions with Lewmar (phone/email), they continuously avoided even addressing topic of faulty cap design and made no indication that they though it was/is an issue---even though I provided extensive documentation to the contrary. (I posted complete email interaction recently on TUGNUTS)
mine sheared the pin immediately after launching boat in spring and electric motor spun freely... however when I finally able to schedule boat to be hauled... found that in addition to cap missing.. that I was able to turn prop... but much more force needed to be applied for prop to turn shaft..gears had not yet locked up but extra torque must have caused pin to shear.)Gears eventually seized up next day).
Note-In my recent discussions with Lewmar (phone/email), they continuously avoided even addressing topic of faulty cap design and made no indication that they though it was/is an issue---even though I provided extensive documentation to the contrary. (I posted complete email interaction recently on TUGNUTS)