JD 4020/4010 Ported Filter Cover T31170 Or L55982 Which Bolt To Use??

   / JD 4020/4010 Ported Filter Cover T31170 Or L55982 Which Bolt To Use?? #21  
how did you make out did you get it all figured out which bolt
 
   / JD 4020/4010 Ported Filter Cover T31170 Or L55982 Which Bolt To Use?? #22  
Since this thread was initiated it has been discussed on another tractor forum the alternate ways of returning hyd oil on JD New Generation rowcrop tractors when loader valves are involved and if it were my tractor I utilize the return port on LH side by the hyd filter in lieu of the expensive ported filter cover. Another advantage is not having to contend with return hyd hose while changing hyd filter and trying to get filter cover seated/sealed on quad ring with hose in the way. If you drill and tap old hyd filter cover it needs to be performed correctly to keep from ruining hyd filter with returning hyd oil.
 

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