I was doing some research on the forum this morning and I found a short, but interesting Van Wert thread.http://nepacrossroads.com/post407472.ht ... rt#p407472
This thread discusses the VA-400/VA-600 feed rate and how to adjust it. The original poster and some of his friends with Van Werts were having problems with un-burnt coal due to the feed rate being to high. It refers to the VW parts list for the bits that need changing. To my surprise, I found out that I have NOT been running this stoker as a VA-400. I've been running it a bit slower.
I decided to try the original VA-400 settings, just for the heck of it.
The original set up for a VA-400 is:
Motor pulley = 3.5"
Gearbox pulley = 3"
Gearbox = 600 : 1 ratio
Gearbox sprocket = 10 teeth
Pot auger sprocket = 21 teeth
I had everything right except the motor pulley. I was using an adjustable 3" split pulley.
I swapped in a 3.5" motor pulley.
I turned the air down to 4 and let it go. If my old feed rate tests were accurate, this set up should yield about 17.5 pounds per hour. According to the manual, the VA-400 should push 12 pounds per hour.
I'll leave it run for a day to see what happens. My guess is the feed rate will be to high and the ash will be very heavy.
While I was doing this I noticed that the 4 nuts, bolts, washers that held the motor on were not quite right. I neglected to put lock washers on and the flat washers were small enough to get stuck in the slots.
I installed some big grade 8 flat washers with lock washers, all is good to go now. Swapping this pulley got a lot more complicated than I thought it would be!