As above, look at hydraulics, as these are the most likely problem (look first for leaks, then bleed it - if this fixes the problem it will only be temporary though, and either master of slave or both will need to be overhauled/replaced. However, some models, probably including yours, are prone to failure of the clutch fork  where it pivots on a round-headed post. This unfortunately is an engine or gearbox out job, although parts are relatively inexpensive. 
The system is self-adjusting, and there is no adjustment apart from setting up the system. Note, however, that I have encountered the nuts on the pushrod of the master cylinder coming loose and losing motion there. Check by removing the cover on top of the pedal box and observing movement - the trunnion the piston rod goes through should have no free play on the rod. If the nuts are loose, adjust so there is about 1mm movement before the piston starts to move, and lock.
John
				
			 
			
		 
			
				
			
			
				John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
			
			
		 
	
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