Hi hope someone can shed some light on a minor issue i am having with my Leyland384 (1971). I usually leave my block on the rear linkage up and locked for long periods of time when using the front loader. But recently like today, i put the block down, and now have lost all hydraulic power? The block will not lift and the front loader will not operate? I have only had the machine a year, no problems like this before? Any help appreciated.