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(ET) In other news, chainsaws!

Been doing a lot of log work out back, mostly cutting up trees that have fallen down and bringing the logs back to the house to cut up with the 16 inch Craftsman electric. Good chainsaw chains are a must, otherwise one is just burning their way through the log. So I've been using Oregon chains which seem to work well (put chainsaw on log, let chainsaw weight cut through it)
Out in the forest I use the 900 watt rotary inverter for 120 volts and while it is nice it is a bit sub optimal. So I dug out the chainsaw and tried it. Dull blade, but slow and dirty and draggy.
So I took it into the shed and cleaned out the bar and the overall crud. *WOW*. There was so much caked on GUNK on that thing it wasn't funny. I must have dug out half a pound of black tar from the chainsaw bar itself; kind of amazed the oiler worked. But cleaner it is now, I polished up the plug tines, and cleared out the crap from around the brushes. Brushes are fine, plenty left. Also put a bit of penetrating oil on the motor bearings, I've found this works into the bearing and helps to re-lubricate the clay that is the original grease in there.
The oil pump works fine, and I didn't split the motor off the unit because I don't know if that would dump all of the oil. Plus I would guess that finding a gasket might be hard....
I then sharpened the chain links as best I can. I did order a new 13 inch .050 chain from Amazon, seems like there is one manufacturer and I don't know if it's going to be garbage or not. Any source on higher quality cians, and is it possible to put a more common bar (14 inch, .050 for example) on it? 

Will try it out tomorrow.
Oh last thought: I used to kill myself getting the logs into the trailer (8 feet long or so) but then realized I can just wrap a tow strap around them and drag them back up the hill with the E20. These things have a surprising amount of power.... 

On 12/27/25 11:58, Ben Carter via Elec-trak wrote:

  Not sure if the attachments will come through, but I have the following:
GE Elec Trak E-15 performance curve.jpg
GE Elec Trak performance curve e20pwcrv.jpg

Several years ago I added a horsepower curve for the latter diagram, 
titled:
GE Elec Trak performance curve e20pwcrv_HP added.jpg

I did this by using the If=1.9 RPM curve to calculate horsepower, which is 
what I believe the e20 production motor uses based on other GE literature. 
I suppose the other curves are with field weakening engaged? My E20 didn't 
run at all when I got it, so absolutely everything was gutted and it runs 
with no field weakening using a Curtis controller. As a result, I have no 
experience using the OEM field weakening.
I'm not sure these answer your original question, though, as I believe the 
graphs show armature amps and not field amps.
Regards,Ben
     On Saturday, December 27, 2025 at 11:20:22 AM EST, john <johnreinhard 
rochester rr com> wrote:
Update: 

Chris gave me some good info & made some good points.

I am still looking for performance graphs, if anyone has them.

I searched a bit more, and discovered a post, on this group, back in
2010, by 'Mike Wallace' - or Mike in Kentucky, who mentioned that he had
copies of performance curves for E-15 traction/main motor from GE.

Anyone know if he is still around (on this group or others), so I could
contact him ?

Thank You,

John


On 12/25/25 18:47, john wrote:

Hi all,

I think I asked this a couple years ago, and never got the graph or
charts I was hoping for.

Does anyone have the field / armature profiles for the traction motors ?

I am primarily testing with an E-15 motor, but E-20 or E-12 (SepEx
version) would be helpful.

I am testing on a clone of Curtis 1268-5403 Sepex Controller, and need
ratio of field amps to armature amps, at minimum.

If no one has the original GE motor info, maybe someone with an
Alltrax controller could look at the settings ? (unless they are hidden).

Any help would be appreciated.

Thank You,

John


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