Hi All,

I have just finished the rebuild of my Lister SR2 Genset, comprising the aforementioned SR2 directly coupled to a Brush (6kva) SCAF 2.25 generator. Thankfully it produces the correct AC voltage after a bit of adjustment of the no-load resistor, and it appears to handle voltage regulation OK with changing load, so I assume the aux field bits are working as well. The only problem is that there is a gradual voltage drop (from 244 down to about 236) on a constant 20% load after about 10 mins running, and the rate of voltage drop appears to increase with time. I've checked the engine speed and this has dropped a bit (presumably due to slight changes in the governor as the various bits warm up & expand), but not enough to account for the level of voltage drop. The only other thought I had was that as the no-load resistor warms up with the current running through it, its resistance increases, thus reducing the excitation current & thus the output voltage. Am I right & if so any ideas as to how I can get around this problem?

Many thanks,
Kernowman.

Hi,
I have recently acquired a Brush SCAF 2.25 generator which I hoping to couple to my Lister SR2 to re-create the full Lister SR2 Gen Set. However the genny is a bit battered but basically sound, and I'm looking for the following bits:-
DC Brushes part codes 1173014/01 (same as 064-82181/002) 7/8" X 5/16" X 1&1/8" long - ideally 4 but I could get away with 2.
AC brushes part code 1155193/02 (same as 064-82180/001) 8mm X 16mm X 20mm long - 4 off
AC Brush holder part code 1155671/01 (same as 064-82170/002) - 1 off
Flange guard part code 1194010/01.
35mm split boss coupling, part code 201-12793.
If anyone has got any of these to spare there is a good chance you will get added to my Xmas card list.
Thanks & best regards.
Clive B.