My press is a Dillon RL 550B that I bought used, but showed absolutely no signs wear.
After approximately 3,500 loads, the machine started to stiffen up to the point where the handle would not locate on the neutral position between pressing the round, and the primer. Oiling didn’t help, so I took the machine down for inspection.
The Right Link Arm (pn 13474) has galled around the Hollow Link Arm Pin (pn 13881). Disassembly revealed the following damage to the Link Arm (see pictures). Apparently some casting sand was embedded in a porous cavity in the Arm, and caused the failure.
I considered several aproaches to this repair, along with engineering improvements to preclude future failures:
1 Ream the original arm and replace.
2 Ream all pivot point holes, Press in oilite bushings, and use reduced diameter pins.
3 Machine and tap all pivot points for grease fittings.
4 Machine all pivot points for oil holes.
5 Call Dillon and test their warranty.
A combination of option 4 & 5 were selected. A quick call to Dillon and a new Right Link Arm, Hollow Link Pin, and a Shell Plate Platform alignment tool was dispatched without question or cost. Upon inspecting the new Link Arm, It appears that Dillon and I had the same idea, as the new Arm was machined for oiling.
The old arm was machined as a test, then all pivot points were machined. I had to make sure that the oil holes would be in a position to hold oil when at rest.
Indeed, the Dillon warranty is exactly as stated.
After approximately 3,500 loads, the machine started to stiffen up to the point where the handle would not locate on the neutral position between pressing the round, and the primer. Oiling didn’t help, so I took the machine down for inspection.
The Right Link Arm (pn 13474) has galled around the Hollow Link Arm Pin (pn 13881). Disassembly revealed the following damage to the Link Arm (see pictures). Apparently some casting sand was embedded in a porous cavity in the Arm, and caused the failure.
I considered several aproaches to this repair, along with engineering improvements to preclude future failures:
1 Ream the original arm and replace.
2 Ream all pivot point holes, Press in oilite bushings, and use reduced diameter pins.
3 Machine and tap all pivot points for grease fittings.
4 Machine all pivot points for oil holes.
5 Call Dillon and test their warranty.
A combination of option 4 & 5 were selected. A quick call to Dillon and a new Right Link Arm, Hollow Link Pin, and a Shell Plate Platform alignment tool was dispatched without question or cost. Upon inspecting the new Link Arm, It appears that Dillon and I had the same idea, as the new Arm was machined for oiling.
The old arm was machined as a test, then all pivot points were machined. I had to make sure that the oil holes would be in a position to hold oil when at rest.
Indeed, the Dillon warranty is exactly as stated.