Cleaning will be rather straight forward. I have attached a photo of the 440 Make sure the pugmill is not plugged into any electric outlet.
If there is clay dried and lodged in the barrel, wrap the nozzle end with a baggy and use some tape to secure it on the nozzle. Pour some water, maybe a cup or 2 into the mixing chamber so that it can soak and soften the dried clay in the barrel, soak at least 24 hrs.
When you come back you can start dissembling the barrel. Take off the baggy, have a small bucket for any water that wants to pour out.
On the front nozzle there are 4 threaded bolts with nuts on the back side. Unscrew theses and set them aside. the front nozzle will come off. if there is clay inside this part gently wiggle it till it comes off. Clean up the clay that is easily accessible. Remove the plexiglass and gague and set aside, clean out any clay that is in the vacuum chamber.
You will see a spring inside attached to a lever on the left hand side. With a pair of needle nose pliers remove the spring and set it aside. This is where the vacuum from the pump pulls the air out of the clay.
You will notice that this lever rocks back and forth with just the pressure of you finger. When you get ready to remove the barrel in a moment this lever need to be rocker down where the spring was attached. You can do this with simple finger pressure.
Next there are 4 bolts holding the barrel to the back plate of the pugmill. unscrew those and set them aside.
Noe the barrel can be removed. If there is a lot of clay you need to gently twist and pull the barrel forward while at the same time holding that rocker lever down, as mentioned before.
It may take 2 people if the barrel is stuck try adding some water while trying to loosen the barrel. It will come forward.
After the barrel is removed clean the clay on the shaft. About half way on the shaft is a screen, this should be cleaned out as well.
After this, take a break, have some ice tea and start reassembling.
The trickyest part is lining up the hole on the back plate with the 4 bolts. There is a thin metal sheet that acts as a sort of gasket that always seems to give me fits trying to line up the holes, and the bolts and the back where the bolts screw in. Be sure not to cross thread these. Helps to spray them with some 3 in i oil to make reassembling easier.
Remember to hold down that rocker lever as you refit the barrel. After screwing in the 4 back bolts reattach the spring then reattach the front nozzle.
Last part is to remove the orange cover that is held in place by 2 screws on the top. slide the cover back and off. you should see 2 bearings and a place for one or both to grease the bearings. This is called a grease zert. Get a mini grease gun from lowes home improvement or Auto zone if you don't have one. Give about one shot of grease to each. older models didn't have this. Clean out any clay that might be around the bearings with a stick or screw driver and reassemble.
I hope I haven't missed anything if I have I hope someone will chime in. Good luck, a pugmill makes all the difference. Wyndham