Search results

Thanks, for the advice guys, glad to hear you were actually able to do this on a mac spindle Fordulike, I was worried that the metal might be too thin around the centre hole. I plan to take the spindle right out as I need to pull the phase wires through another 2" as they've become beared where...

Hi all and anyone, The threads on the axle of my MAC motor have stripped. I've spoken to eM3ev who have spoken to MAC and neither have an old one. This axle has the phase wires threaded through the centre unlike the newer versions that have the wires through the casing. I just thought I'd ask...

That's very useful info, thanks. I didn't know mosfets could partially work. I suspect a damaged hall sensor cable or loose connection is more likely but I might just try using a spare controller first as I have one, to see if it's a mosfet issue.

I'm sure you're both right about the problem being electrical, but I'll replace the clutch anyway as it's definitely not disengaging. When I freewheel downhill the motor makes the same whine as when I'm riding normally and the resistance is the same whichever way I turn the wheel. Finding the...

Thanks vfr400, it feels the same in both directions, the motor feels engaged and turning so yes I think the bearing is stuck. I've ordered a new clutch so hopefully that will fix the problem.

Hi Nealh, thanks for replying. The old nylon clutch gears were replaced with composite a while back, I have destroyed 2 sets of nylon gears over the past 6 years but the composite gears look ok, no teeth stripped. I don't remember there being a problem interlocking the gears but as I've decided...

Hi, I'm having a problem with my front wheel mac motor (geared hub motor similar to BMC). Firstly I believe the clutch is stuck, it sounds like the motor is turning when I'm freewheeling with the throttle off. I replaced the gears on it fairly recently and used a black coloured multi purpose...

Thanks again Dave, the one I was looking at on ebay can't be shipped apparently since a change in regulations so I'm back to square one.

Hi all, One of the prismatic pouch cells in my lifepo4 battery has died. It's showing zero voltage and although it doesn't appear puffed the pouch is loose and the sides are not smooth like the remaining cells. I assume there has been some physical damage. The cell has no writing on it and so...

I originally bought 2 kits and 2 batteries. One battery failed after a couple of years all the cells puffed up. It was the one my partner used and hadn't been used for for about 5 months. Paul from Em3ev thought the cause was that the battery was over discharged and the cells puffed when it was...

Thanks Neal, I don't suppose a pouch cell can be revived in the same way as an 18650 cell by connecting in parallel? I'm thinking the current would be too high. It seems really odd that the original bms would allow charging but cut discharge when you increased the load and the replacement...

Hi Dave, I wasn't quite sure what you meant but thought I would open it up again and have a look and decided to test the individual cell voltages to check they were balanced. I found that 14 cells were between 3.55 and 3.58 one cell was at 3.33 and one cell was at 0. This is probably a daft...

It was made by em3ev a couple of years ago. I chose the 22p's to keep the price down a bit as the higher capacity cells cost more per ah.

Thanks Neal. I'll probably look at working on this battery after the lifepo4 one now. I've got one working battery and my partner only uses her bike in the Summer. I'm sure I'll be back asking questions then.

Thanks Dave. So if a charge mosfet were to fail that would prevent charging? New bms on order now, but just trying to gain some knowledge. Also the replacement bms I bought for the other battery (14s9p 18650 cells) has a shared charge and discharge connection point. So I assume it shares...

Thanks Dave, I'll get one ordered straight away. I was worried about charging in this way. I wasn't sure if it would bypass the bms as some bms boards seem to have shared charge and discharge connection points. However this one doesn't. So far I only did it as a test after riding about 1m to...

While this battery is a work in progress I have another one that I think just needs a new bms. It charges if I connect the positive charge cable and negative discharge cable but won't charge using the negative charge cable. This is after changing the bms to a salvaged one from a previous...

I was thinking I would try and remove the lower 6 blocks on the lhs in one go, by prising off the outside tab connecting the top two blocks on this side. Would that be a bad idea?

Thanks, I guess I will have a clearer idea of any leaks once I have removed the cells. I will try and use your tip from another thread of connecting a good cell and a low voltage cell in parrallel for a few seconds to try and revive them enough to charge.

Yes the 3.49v reading is from the bottom block of 9 cells on the left hand side in the picture. The block above them gives 2.41v and the next 3 blocks above them are at zero (more or less) there are 2 more blocks above them at 3.9v each and all the 7 blocks on the rhs are at 3.9v. Thanks for...