This post describes a DIY Winchrite repair, when my Winchrite electric winch handle suddenly stopped working.
What is a Winchrite?
The Winchrite ABT (Advanced Brushless Technology) is a rechargeable electric winch handle made by Sailology and sold by many marine retail stores. I bought mine in March 2018. It carries a one year warranty. I was very happy with it, using it primarily to raise the mainsail and on the jib furler.
In early June, 2019, the Winchrite stopped working after successfully sheeting in the genoa on Tangleberry. When I picked it up a few minutes later it was completely dead. I plugged it into the charger,. The indicator light, which is normally red when charging or green when fully charged flashed red on and off rapidly.
Inside the Winchrite
I brought the unit home. Since it was off warranty I opened it up to see if I could find any obvious problem such as a broken wire or burned component. Inside it was clean and dry. I didn’t see any signs of damage. One of the machine screws which holds the covers showed signs of rust. They are not stainless steel but should be. They have small silicon rubber plugs over them but one was missing, and that was the one corroded.
Sailology support
Thinking I might have the Winchrite repaired by the factory, I went to Sailology’s web site and filled in their tech support form, describing the symptoms. I didn’t receive a response after 3 days so I emailed the contact emails in the About section of the web site. Martin Lynn, one of the founders, responded, but he just told me to fill out the support form. I did that a second time. This was the response:
The condition appears to be a battery thermal sensor which has failed.
Please ship the unit via UPS or USPS to the following address. Do not ship the battery-“unsafe conditions for transport may exist” Include a copy of this entire email with the shipment. We will trouble shoot the unit and send it back with our findings.
Sailology
42212 North 41st Drive, #106, Anthem, Arizona 85086
Tech Services
There was no mention of cost for Winchrite repair, so perhaps they would repair it free. However since I’m in Canada, and packing and shipping a fairly large item to Arizona is expensive, I decided to diagnose the problem to the component.
DIY Winchrite Repair
Tools needed: #2 Phillips screwdriver, digital multi-meter, and small scissors.
I identified each of the components inside the unit and after removing the cover, held by 8 Phillips head machine screws. There are two circuit boards. One is the BMS (Battery Management System). The other, closest to the motor, is the Motor Control Board. The components are identified in the photo below.
I first disconnected the battery pack plug and checked the battery voltage. It read 20 volts. The full charge voltage should be at least 21.6 volts.
With the charger connected, pressing the control switch caused the chime to sound and the motor to run for a moment. To me this indicated the motor and motor control systems were functional. I suspected the battery pack, which also contains the thermal switches.
Removing the Winchrite Battery
To remove the battery pack from the Winchrite one must first release the motor and gearbox. There are four small Phillips screws holding them in place. The motor and gearbox are not firmly fastened together and will separate as they come out and 3 little gears will drop out. Guess how I know this! To prevent this use a piece of masking or electrical tape along the top. Then remove the four screws and set them aside. Unplug the battery plugs and lift the motor gently upward to allow the wires to slide out underneath it. Remove the battery.
The photo below shows the battery pack with the covering removed. The red and black wires are the main power connector wires. The white wires are for the thermal sensors and the battery monitoring leads. It is possible to check the individual cells from the white plug,
There are 12-18650 Lithium cells in the pack, wired with 6 pairs in parallel adding up to 21.6 volts. If you have no idea what this means take the battery pack to an expert for testing and repair if needed. I found a guy on Craigslist. I did my own test first.
Testing the Winchrite Battery
This shows how to identify the pins on the battery balance connector. Disconnect the battery from both connectors. You can access the pins on the battery plug using a digital multi-meter on the 20 or 200 volt scale. From the black negative wire on the battery to B1 should read 3-4 volts. Move the probe to B2 6-8 volts), B3 (9-12 volts), B4(12-15volts), and B5(15-19) in turn. The voltage should increase with each move up the list. If 2 readings are the same or zero you have an open or shorted cell. A fully charged battery will read around 21.6 volts(or more) between the Black and Red wire.
In my case B1 read 0 volts, indicating a bad cell. I found a guy on Craigslist who specializes in rebuilding Li-Ion battery packs based on 18650 cells like these. For 120 CDN (about 90 US) he replaced all the cells with brand new 3000mah(milliamp hours) cells. The old ones were labeled 1500mah, so we doubled the battery capacity to 6000mah. Currently Winchrite advertises the battery capacity at 5.8 ah (5800mah) so perhaps they have upgraded the cells in newer units. If you are a handy type, there are plenty of Youtube videos showing how to make or rebuild battery packs. I decided to let somebody else do it.
Winchrite Repair successful
After the new battery pack was installed the unit is now fully functional .My DIY Winchrite repair worked! I used it last weekend to raise the mainsail and furl the genoa. It worked like new. I can’t speak to battery life as I didn’t use it for very long.
Update 1 Year Later
The Winchrite continues to perform perfectly. It seems to hold a charge well. The battery has never run low even after a hard day of sailing. I use it on the halyards and sheets, as well as the jib furling lines. I always plug in the 12 volt charger at the end of the day, then unplug when I notice it has a full charge.
Hi. The gearbox in my WinchRite is broken. I can replace me self if I can get a hold of a new one. I live in Norway but is now in Greece. Can you help me with information where I can buy it.
If you send the mail you’re looking for the part I can send you winchrite gearbox
Contact support@sailology.com. You might have to email a couple of times to get a response. They have parts.
Have you disassembled it to see what components are damaged? A machine shop might be able to fabricate a new part cheaper than shipping from USA.
Hi Admin
This is a great site, thanks for sharing your experience especially about taping the motor and gearbox before removal. I’ve recently been abusing my Winchrite by clamping it in place and wiring in a remote switch. This worked great until I overloaded the winch pulling up my lifting keel.
Now nothing happens when I pull the switch – no chime, nothing. Inside everything looks fine, no signs of overheating and the motor turns freely by hand. The charging function seems to be working.
It looks like I’ve blown a fuse on the motor control side. Is there a fuse on the motor control circuit board that I can replace?
I’ve emailed Sailology but I suspect you may provide more helpful advice.
Thanks John
Mine behaved the same way when it failed. It turned out to be a blown battery cell. I don’t think there is a fuse.
Start by measuring the battery voltage with the charger disconnected. If the voltage is much below 21.6 chances are the battery pack needs repair.
Thanks Admin!
Your views and detailed explanations, gave me the confidence to make my own repair. My unit was stuck in slow mode, and easy to fix myself, thanks to your information!
Mine seems not to be completely recharging the battery. I measured all the voltages on the battery balance connector as you showed and got readings on the low side for each cell, but still within range. I did notice that with the battery cable disconnected and the charger plugged in, the charge voltage on the red wire coming off the balance board is 12V. Is that correct? I only see 17.6V across the black and red battery wires even when they are connected to the board and the charger is plugged in. Can’t tell if I have a bad battery pack or a bad charging circuit.
I thnk you need to check the charging input with the batteries connected. The red light should be on and the charging voltage should be at least 13.5V. If the green light is on the charge controller thinks the battery is fully charged.
The DC motor is bound on my Winchrite. Has anybody taken the motor apart? Woner if the bearings are bound?
I haven’t opened the motor on mine. If it is bound up you might need a new one. In that case, what could it hurt to open it up and see if you can free it?
Great information. Same symptoms for me except when I test all the cells they are good showing the numbers you said should be there. So, probably a temperature sensor issue, what can I do about that?
Thanks,
Michael
The two temperature sensors are located on the battery pack. On the battery connector pins they are pairs TKA1 – TKA2 and TKB1 -TKB2.
With the battery pack disconnected, use a multimeter to check resistance on the battery pack on each of the two pairs. It is unlikely that both of them are bad, so if you get the same reading on both chances are that is not the problem. If the readings are different then one of the sensors is bad. I don’t know which way they operate, so cannot verify what the correct reading is without dismantling mine again.
Unwrap the battery pack, and find the sensors. They should have a part umber which you can look up on Digikey or Mouser. I would replace them both. If you aren’t comfortable soldering a cell phone repair guy can probably do it for you.
Hi,
I am one of the owners of Sailology. First off, great site and good information. Secondly, sorry about our support emails. Our internet service provider has been less than stellar and we are in the process of migrating over to a new hosting company. We pride ourselves on quick responses and always try to help. I have actually sent this link to our battery manufacturer to see if they can make improvements.
Also to all on this site – we do have parts and will always try to send you what we can to keep you up and running. I will say for $90 Canadian to rebuild the battery we probably couldn’t ship outside of the US for that price. I would appreciate it if you could provide me the contact of the battery rebuilder so we may use him in the future as an option for Canada.
For the gentleman with the DC motor issue. If it is a brushed motor – first generation WinchRite – we unfortunately do not have any parts left. We have been offering a trade in discount on the new unit that give it to you at wholesale cost.
I hope this helps and feel free to contact me with any questions.
thanks
Sven
Hi Sven,
Great to see you on here. I will send you an email with contact info for the battery guy. I am now a very happy Winchrite user, and recommend it to my friends. Thanks for a great product!
My WinchRite has lost power. I bought it at the Miami Boat Show in 2016. It appears to charge OK, but upon use, it runs for a few seconds until a load builds, then it shuts down. You can repeat, then it just shuts down again. Even off the winch, when you engage the motor, it runs for a few secondsand shuts down, then won’t restart.
Can I buy a new battery pak? You already fixed a gear issue on it under warranty, but I just don’t use it enough to keep up the battery. What should I do? THanks,
Hi Stephen
Have you already solve your problem which I have the same.?
Best regards
Orhun Maslak
Hello Sven. I have this winch that is a bit more than two years old and it is now broken. So I need a new under casing as most of the studs that holds the content in place are broken. Maybe I also need to replace the gearbox or parts of it as the 1/2 inch output does not rotate when the motor is running. What can you make available to me?
Regards, Hans Johansson
Torslanda Sweden
Hello Sven,
I have my second Winchrite currently disassembled in my garage. The first was replaced for the same problem, runs but no torque. Upon disassembly the problem is clear, four tiny screws countering the torque of a hefty motor and pretty substantial drivetrain. I am surprised that I am not seeing that mentioned here. We used ours for raising the main exclusively, not a real hefty load but still the same ting failed twice. Have you revised the design of the case?
Sven,
I need a new battery for my winchrite. can yiu or anyone out there sell me one? JohnPaulDiLorenzo@gmail.com
321 576 2717
thanks
I have been emailing WinchRIte support for weeks and have not gotten a reply. Very frustrating. We have a broken gearbox and would like to replace it. Any suggestions on getting them to respond?
Foiled at the first step.
I have a WinchRite v5.1. I’ve managed to undo all the screws and the cover is loose, but the metal winch rotor (8 point star) is too big to go through the hole in the plastic!!
Any ideas about how to remove the cover ??!!
Figured it out. Brute force. The rotor is only held onto the square drive shaft with a ball bearing, like a socket spanner/wrench.
My V5.1 has battery connector has terminals labelled B1(3.7V), B2(7.4V), B3(11.1V), B4(14.8V), B5(18.48V). So the batteries appear to have the right voltage, but I don’t know how to tell if they’re “holding their charge”. There are also a couple of black wires on the connector that are conected to TH1 on the circuit board.
The battery output has B+ and B- (battery output). With the battery disconnected, I get 22.2 volts across B+/B-
I can plug the unit into a charger, and in 10-20 minutes the green light comes on.
Leaving the charger plugged in, I can run the unit for several minutes.
If I unplug the charger, the unit will run for about 1.5 seconds before cutting out
Any ideas??
It could still be a bad battery. I would take the battery pack to a battery repair guy. Ebikes use the same cells, so the people who repair ebike power usnit should be able to help.
Glad you have had success with your Winchrite. I purchased a unit that failed – fortunately a few weeks before the warranty ran out. The retailer changed out the unit for a new one. The winch socket managed to disconnect and went straight over the side – the retailer sold me a new one for about 20% of the cost of the Winchrite. 13 months later the replacement unit failed, with the cost of repairs close to the cost of a new unit. The retailer suggested buying a new unit as ‘the battery pack and bms had been upgraded’ and ‘fixed’ the problems of the earlier units. I sold the broken unit for parts. The retailer no longer stocks Winchrite, citing the breakdown and warranty problems.
Hi Sven.
The little spur gear on the motor shaft of my first gen. Winchrite slips when under load in – in fact I can easily remove it by hand. Otherwise the unit is fully functional, so it would be a shame to discard it. Is that something you might have? Or a suggestion as to where to buy a replacement?
I’m in the UK, by the way.
I have the same issue and need a repair.
I too am having issues with the gear box. In purchased unit in fall of 2018 for use in 2019 season. Unfortunately the I
Unit broke and I did send back under warranty. Being in Canada however, postage and “duty” to get my own unit back came to $180 cdn. I now have iver $1200 cdn invested.
You can imagine my disappointment when first time out in 2020 it broke again. So like the others on this site I took it upon myself to open unit. It seems I need one of the three larger gears closest to the motor. I only see two in the unit, thus the reason for it disengaging.
I have sent email to sailology and am hoping for some info in getting this tiny gear. The sailology website is not that helpful.
Please advise if this gear is available anywhere?? Thanks for any help
Regards. Jamie Nicol
I too have that problem. The unit is only two seasons old and has missed most of both seasons due to breakdowns. Is there a fix? It like the clutch is stripped??
Being in Canada shipping unit back is not a feasible option. Have done it once already. Shipping And duty tax to get it back not pretty.
Wow…so many problems & lack of support. I was going to buy one, glad I came here first.
Mine is still working fine. Bear in mind that users who are happy rarely leave comments!
Hi Admin and others, Where can I get the two thermostats: TEMGUARD KY11 BS45˚C, KY11 BS70˚C.
My WinchRite is fully charged and stops after 1 or 2 seconds. Disassembled according to above. Battery measures 23.3volts. When using TKA1 – TKA2 and TKB1 -TKB2, the thermostats measured zero ohms in both directions, and zero volts in both directions. So I suspect the thermostats are fried. Unwrapped the battery, found the thermostats. Nomenclature TEMGUARD KY11 BS45˚C, KY11 BS70˚C.
Hi there, 2nd time I actually used it. Raising my main I heard a loud pop from inside. Took it home opened up. The gear box broke right in half. Inspecting the break I see signs of a defective casting. After the gar box broke it ripped the plastic studs off that side of the housing. Hoping to get a new gearbox and half of the housing, the isde with the switch in it. It was working and being over 60 need the extra hand.
Thanks,
Brian
Stephen L Zito, I had the same symptoms as you describe. I emailed tech support and they gave me instructions on how to solder two leads together on one of the circuit board components. I tried it and it is working, so you should reach out to them too.
Thanks for the excellent information! I just checked my winchrite, an early specimen which is partly hand soldered.
Problem: Battery is full, but no movement.
Diagnosis: I opened it up, checked all the voltage as described : all OK. Then I measured at the motor: 24V present when trigger is pulled.
When I move the motor a bit with a screwdriver, and then try again it sometimes moves, but only a short time.
I did then open the black covers for the carbon brushes, and found that they are the problem: one of the springs was corroded and not pushinig the brush against the motor runner. Bent it a bit and the motor worked again beautifully. I have now ordered new brushes (5 x 7 x15 mm) on Ebay, that should solve the problem permanently.
How long should a fully charged winchrite run without load? Mine goes for about 90 seconds. When fully charged, it shows 24.3 volts. after running for 90 seconds and running out of charge, it is down to 23.05 volts. Is this how it should operate? Thanks for the help.
Great article which helped me repair my brushless winchrite. Points to note the Temguard small size low resistance thermostat switches 2 on the batteries and one on the motor are go and no go type. This means when normally running, the circuit is closed with a near zero resistance reading. When hot or when they have failed you will get a large resistance reading. My fault was that the unit was running and would cut out/stop after running for a while when not connected to the winch. When connected to the winch under load the unit would run but cutout very quickly. Talking to electric battery bicycle specialist they informed me this is a common fault on electric bikes and indicates the batteries are failing needing replacement. I ended up changing all the resistance thermostats as they where cheap when I only needed to change battery. I replaced the batteries with Samsung 25R – 18650 and bought a “APROTII Portable Spot Welder,Handheld Portable DIY Spot Welder Mini Spot Welding Machine with Quick Release Pen Nickel Plate 18650 Battery Spot Welder” from Amazon which worked great to weld nickel plate supplied with welder to the batteries.
I have a winchrite portable winch which does not work under load. On taking the unit apart the casting holding the drive unit has snapped ( has to be a fault in the casting. Does anyone have a winchrite unit that they are intent on discarding, I am happy to pay small cost and postage.
I bought my WinchRite V5 in 2012 and have loved it ever since. I had a small issue with it a few years in and I returned it for service, expecting to pay for the out-of-warranty repairs. I was pleased when it was returned, fully functional, and at no charge. And I have recommended it to my boating friends many times. Thank you, Martin!
Now, after 10 years of ownership, I have a small, minor problem, but one which prevents use. That is, the spring-loaded ball bearing that holds the cog to the drive shaft has somehow rusted and no longer depresses when I try to install the cog. As a result, I can’t put it on. I have tried using some WD-40 to free it up but so far, no results.
Anyone have any ideas how I might fix this? Can it be shipped back to the factory for repairs?
I bought a new Winchrite 21 Months ago. As a sufferer of arthritis, the Winchrite has been a godsend! Sadly the gearbox slips and it can’t take any load. It is out of warranty and the UK supplier no longer seems to be in business. With the high cost of transport to the manufacturers, it may not be worthwhile, so not sure what to do. Is this part easy to obtain?
I also have the gearbox ´gone´. I´am living in Belgium. Can you give me the write contact adress please.
Willy Dendooven
demarrage4800@gmail.comm
Just bought a WinchRte used very little used on main 2x and third gear box blow out. Can’t find replacement gearbox or gearbox motor assembly anywhere.
Before this one on used on my SC47 for 5 years sold it withe boat. Very disappointed the gearbox went out on as much smaller boat. CS36. See people here with the same issue looks easy to replace. Why can’t ya just buy parts.
Ken
I’m on my second WinchRite had my 1st one from 2018 to 2022 . Sold it with my SC47 regretfully after it pulled up my main over fifty times. I would go out use it on all my big sails never hand winch all day.
So I bought a CS36 and wanted set it up to single had it. Bought another WinchRite second time I pulled up the little main the gear box blew out. Can’t seem to find any place to buy parts for this unit. Never opened my old one opened this one and was supprised how small and undersized the gear box is. Bought this one slightly used on eBay. Had no idea the support and replace ment parts are all but impossible to get. Can anyone direct me to were to replace the gear box seems simple to replace.
Thanks for any reply
Ken