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Old 06-25-20, 10:35 PM   #361
Daox
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Alright, I got the mower running again today. It took a bit more work than I first thought.

I got the replacement bearing, but when I went to put it together I noticed this:



The shaft is worn / damaged where the bearings sit. This would toast the new bearing. So, I ended up purchasing a new shaft assembly.

It all went together just fine. I sharpened the blades for the first time in a few years (wow that was too long to wait).

While things were apart, I decided to tweak things a little bit too.

I replaced the driven pulley on the mower deck. I went from a 3" to a 3.5". This slows down the blades about 15%. The objective here is really to lessen power draw. I wasn't able to test this yet as my ammeter is actually broken on the mower. However, I look forward to seeing how this has helped.







I also added a battery acid protection shield over the motor. When I roasted the motor before, it was because the battery dripped acid down into it onto the commutator. This was a fairly simple deal with a bit of sheet metal and my bench vise.









So, how did it all work? Really nicely. It is very quiet now. Before, the mower deck made lots of noise. It sounded like a big blower fan. Now, its not bad at all. And, thankfully the mowing quality is not effected. My grass was very long from the mower not running for the past ~2 weeks. It cut through it like butter. If anything, I would say it bogged down less than it used to. This makes sense as there is now more torque going to the blades.

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Old 06-25-20, 10:39 PM   #362
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It looks good.
Getting some welding in.
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Old 06-26-20, 08:30 AM   #363
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Thanks. Its been a very nice refresh. I actually want to continue the update with a few more things.

First off, I think one of my chargers is dead. For a while now I've wanted to move the chargers off of the mower so they don't bounce around and die a premature death. I am thinking this will happen once I get the new charger. I think I asked about 8 conductor connectors earlier when I posted about doing it. I will have to review that and get parts on order too. Suggestions are welcome. The connector has to handle 3A charge current.

Second, I really want to get a 4 cell battery monitor. This will monitor the voltages of each battery individually so I can see if a charger dies, and I can see what the weakest battery is. I would love this to be a bar graph type deal since reading 4 number gauges at once seems dumb. If you have any ideas I am all ears!
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Old 06-26-20, 01:46 PM   #364
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This is kind of what I'm thinking of for my battery monitors. 4 of these would probably do the job. I love how there are no instructions on how to actually adjust it though...

https://www.ebay.com/itm/1PCS-3-30V-...4383.l4275.c10

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Old 07-14-20, 03:45 PM   #365
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I got the LED voltmeters today. Of course, being a cheap product from overseas I started by taking it apart. Inside there really isn't much. Its a single circuit board with one main chip (LM3914V), a resistor and two potentiometers (assuming for meter calibration). The wires are soldered right to the circuit board without any strain relief, so I'll have to fix that as the mower isn't exactly a smooth ride.







So far not too bad. Next I moved on to testing their calibration because who knows what the heck these things are set to. I ordered 5 units and tested each one with my power supply and a multimeter (for greater accuracy).





I was pleasantly surprised by this. Here is the testing results:

#1
max = 13.37V
two red = 11.10V
min = 10.43V

#2
max = 13.42V
two red = 11.24V
min = 10.65V

#3
max = 13.56V
two red = 11.20V
min = 10.56V

#4
max = 13.48V
two red = 11.38V
min = 10.76V

#5
max = 13.16V
two red = 11.22V
min = 10.65V


This is actually pretty darn close to what I want. I typically stop mowing when the voltage on the weakest cell starts hitting 11V. This can likely be achieved without any further calibration by just stopping mowing a bit after I hit the two red LED mark. With the varying load the mower sees, the voltage really jumps all over the place, so super precise measurement is not necessary at all. That being said I still really want these more balanced becuase... ocd?

The main point in having these meters is to make sure that no batteries are dropping below 10.5V, and to make sure the batteries are charging properly. For the entire life of this mower, I've just used a single multimeter to monitor what I believe to be the weakest battery. This in theory works but it doesn't cover all the bases. I've had multiple chargers (I use 4x 12V chargers) die over the years. So, I go plug the mower in after cutting the grass, and the battery just never charges. The next time I go to mow I murder the battery because I didn't notice it never got charged. This really sucks because not only do I need a new charger, but now I need a new battery we well. This solution should prevent that possibility.
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Old 05-19-21, 11:08 AM   #366
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With mowing season back around, I've turned my eyes back to this project. I would really like to get these voltage monitors setup. So, I designed a bracket for mounting them to the mower. The rectangles will house each LED meter. The square looking clip on the back side will hold the relays that power up the LED meters and keep them isolated from each other. The slot on the bottom is for mounting to the mower.

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Old 05-19-21, 12:51 PM   #367
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I too am getting ready to do major surgery on our electric garden tractor.
Converted it about 10 years ago to a series wound 24 Volt 2.5hp motor with 4 T105 golf cart batts. The second set of golf cart batteries have had the biscuit as has the big ol' motor.
Going to pick up a used Leaf battery and build an 80 volt battery using a pwm for speed control on a 2 - 4 hp treadmill motor, which I salvaged.
Am nervous about ripping into the much needed tractor but to replace the motor and batteries would cost about $2,000 I can get a leaf battery for $600 and a pwm for under $100, will only need a motor pulley and a new belt.
Am finding unwanted treadmills to be a mini gold mine of salveagable parts, the first on I got I turned into a monster bench sander with 118" by 20" belts, sands like a son of a gun and you cannot stall it no matter how hard you try.
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Old 05-19-21, 01:23 PM   #368
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Maybe start a new post on your sander. I would like to see it. I got a free treadmill off market place to maybe make a sander from it. It has a 2.5 HP dc motor. but I don't want to side track this post.
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Old 05-19-21, 01:35 PM   #369
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There are a few articles on youtube about it, the main thing to overcome is converting ac line power to DC for the motor.
If you start a thread I will chip in.
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Old 05-24-21, 02:16 PM   #370
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I got my relays and my mount printed up. Just finished test fitting everything and it seems to work out great. Here are some pictures.






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