Trojan HR-77 Rivet Gun

[hd54kh]

I have this pneumatic hand rivet gun that needs a re-build. Anyone have any info about it. The O rings a flat OD O ring (piston seal) and a rear cap gasket are there any available parts available or just try to fit what I might have around the shop?

What type and amount of hydraulic fluid would be appropriate?

Thanks in advance

Terry

 

[LXCam]

I can’t help you on the specifics but I’d suggest buying an oring sizer and McMaster Carr does sell square orings, well at least that’s who I source them from.

 

[hd54kh]

I got enough O rings to pick from and I'll try to measure the broken up "piston ring" flat O ring and see what they have.

Thanks

Terry

 

[tarbellb]

This is a fully hydraulic gun correct? I don't see where the pneumatic comes into play.

I believe I have a similar model from FSI, D-100 hand gun. You might find some similarities?

 

[hd54kh]

OOOPS I think I should correct the first description as Hydraulic not pneumatic my bad. There was at one time hydraulic fluid in the chamber with a piston sealed by an O ring. Trigger moves fluid like a brake master cylinder. I never used it so I can't really speak from experience. There is also a knob on the frame that I don't know what it does and I figure it might be the fluid release.

 

[tarbellb]

Ok that makes more sense.

it's worth fixing, I really like my FSI version of this. Pulls hard! You can easily strip threads on the insert or even snap the smaller tool pieces.

The knob is likely the release mech, after pulling you'll need to release the pressure by holding in the lever and depressing the button

 

[Steve_P]

When possible, I prefer to determine the size of o-rings by the shaft OD and bore size. If you look up the Parker o-ring catalog online, they should have the information required to come up with the o-ring size as this info is in the printed catalog. They have both static and dynamic/reciprocating tables for this where you can measure the shaft groove OD and the bore ID and determine the o-ring required.