Depends on their condition - any wear should be apparent; replace if wear could be measured with a micrometer (you don't need one - if there is a step you can feel, discard. If it is the latest type with roller bearings top and bottom, there should be no wear on the pins (unless it has been low on oil). If it is the older type with a railko bush at the top, the pin will wear, but, again subject to never running dry, the wear should be almost nil. 
John
				
			 
			
		 
			
				
			
			
				John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
			
			
		 
	
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