Pump is working but pressure poor. I have not tried a different nozzle but having a quick look today the hole looks rather large to me.
Changing the valve (assume for the chemical line) on the lance appeared to cause the engine to load up.
The pump seemed to hunt a little when running, and stronger pressure when first pulling the trigger.
yes, know of a guy who narrowed his mate's variwidth plough from 15" down to 12". the mate ploughed a whole field without noticing.Lads would be going round at night, swapping nozzles, you know .......