I've already got a copy of the user manual, thanks to your helpful upload! I'm reluctant to mess around with the valving, but will give it a go if necessary. I briefly inspected the valve a few weeks back before we got it running and didn't notice anything unusual, will have to take another look though. I'm in Somerset, UK. I have a friend in Wales with 2cwt, will have to get in touch with him. It's fitted with a manual hand pump. I opened both cylinders and the valve and cleaned it all out, as there was a lot of old sticky congealed oil in there. I then gave it all a thin coating of fresh oil and let it sit for a week. All other bearings were then greased as instructed in the manual. I know the main crank bearing at the back was repaired at some point, but the repair seems to be solid.
The ram plate seems to be fine, but I'll give it a look when I go in on tuesday. I manually oil all our hammer rams at startup just out of habit.
Thanks for the advice all, I'll check it over next week and letcha know what I find