Do a search on steering relay - there has been quite a lot of discussion. The relay remained unchanged except for minor details, and are fully interchangeable, throughout Series production, so anything in Series 1/2/2a/3 is relevant. (Very early 80s were significantly different but still interchangeable)
The unit can be overhauled in situ, and as you will have found if you followed up on this search, can be almost impossible to remove. The steering arms need the pinch bolt to be fully removed to get them off, as the bolt goes through a groove in the shaft. 
Before attempting to disassemble the unit you should have a manual, which shows how to do it safely (see "Shop" above for the manual on CD). The unit contains a powerful spring, which is in compression, and may cause serious injury or death if not handled correctly. 
John
				
			 
			
		 
			
				
			
			
				John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
			
			
		 
	
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