coderpitt
coderpitt
98 posts
Joined November 2012

What does upgrading 550B to 550C do?

What does upgrading the 550B to a 550C conversion kit do for the press? I just noticed that there was a modification to the press recently and was wondering if I should upgrade my good ole 550B. I currently reload 9mm, 38 special/357 mag, 45 acp, and 223/5.56. More calibers in the future like 270 Win.
dillon
Administrator
dillon
3,222 posts
Joined July 2007

RE: What does upgrading 550B to 550C do?

The design change was to a new design for the upper link arm pivot pins. On your frame, these pins are pressed in. The new design has threaded pins, so they screw into the frame. These pins have a lube groove and a hole in the center. You use a needle fitting on a grease gun to lubricate them. Additionally, if a link arm breaks, it is now no longer necessary to remove the shaft from the machine to replace the link arm.
No other significant design change or benefit, other than maintenance.
coderpitt
coderpitt
98 posts
Joined November 2012

RE: What does upgrading 550B to 550C do?

Thank you! Although that could save realigning the platform, I like to take it down every couple of years and clean and relube. So by aligning on reassembly, it helps keep things running smoothly. I've done about 13k rounds through mine and don't see me cracking an arm anytime soon.
dillon
Administrator
dillon
3,222 posts
Joined July 2007

RE: What does upgrading 550B to 550C do?

A little bit of grease on the link arm pivot pins every year will prevent this.
largenfirm
largenfirm
1 post
Joined December 2010

RE: What does upgrading 550B to 550C do?

So does upgrading a 550b to a 550c require the frame replacement (20094)?

There is a claim, lacking details, that it can be done for $48 of parts, vs. the $110 cost of 20094, and I’d like to understand the difference, before I spend the cash.
dillon
Administrator
dillon
3,222 posts
Joined July 2007

RE: What does upgrading 550B to 550C do?

To change your 550 to the C form, you must buy a frame change kit.
mjmelland
mjmelland
1 post
Joined October 2016

RE: What does upgrading 550B to 550C do?

Do the new threaded pins come with the ~$110 frame change kit ? Or must these extra items also be purchased ?
dillon
Administrator
dillon
3,222 posts
Joined July 2007

RE: What does upgrading 550B to 550C do?

The threaded pins, a disassembly punch, platform alignment tool all come with a frame change kit.