One thing I found on my plane was the nose gear hydraulic cylinder assembly was to long and prevented the over-center link from going to its stop.  I choose to reduce the length of the rod end fitting which before modification was bottoming out in the hydraulic cylinder.  This condition was never given a chance to be a problem, but...

Craig,

 

The extension of hydraulic actuators should be adjusted so that the piston is stopped against the inside of the end plate.  This is important.  While the over center link may be able to withstand 800 psi, the gear pivots and connections may not when the landing forces are added on top of that.  A hard or stressed landing, overfilled tires, higher than normal pressure in the strut and certain super angular forces against linkage from high hydraulic pressure, some possibly caused by descent to warmer temperatures, can add up to gear failures. 

 

With a little encouragement one should be able to remove over center linkage pivot bolts with the actuator fully extended (whilst the craft is on jacks).  I.E. Actuator extension should keep over center links snug, but not under high forces because of hydraulic pressure.