looking for parts manual john deere 644d ,lift boom cylinder repair kit or list.o ring,part number? cylinder parts brake dowm?how to repair bad leak.
Start here: http://jdpc.deere.com/jdpc/servlet/com.deere.u90490.partscatalog.view.servlets.HomePageServlet_Alt Plug in 644D as model, go to "Sectional index" look for "3160-Loader" expand that section. All in there.