Dragonfly Mk2 Pump Linkage Question

[Whirligig]

I've read that some people have had the pump linkage on the Dragonfly Mk2 fail. At least some of these failures are reported to be caused by one or more pump linkage pins breaking, or possibly falling out.

https://www.pyramydair.com/product/seneca-dragonfly-mk2-multi-pump-air-rifle?m=5170

Is there any way to proactively replace the pins that come standard with this air rifle with better/stronger pins?

Does anyone know if there are other potential points of failure with the pumping mechanism, and how to strengthen it to prevent early failure?

Thanks,

-C

[Nvreloader]

Whirley
I have broken several of the linkage rods, since I have "Upped" the velocity/pressure of pumping on my 22 cal DF.

I went this route, I got all the parts that fit together, then measured all the hole diameters of all the parts, (pins/rods) etc
then I bought some reamers that were .0001" larger than the biggest hole/parts measured hole diameters,
(depending on where they were located), and then reamed all the matching parts for that reamer size.

During the measurements of all these parts, I found hole diameters that  were .010" or larger that fit these OEM parts,
and I had lots of clacking/noise when pumping with the OEM setup.

Since reaming all these parts/holes with a reamer diameter .0001" larger,
the pumping effort has been very consistent along with the fps readings etc. (No noise),

I have not broken any more pins/rods as I used grade 5/8 material for the replacement parts.
I have a Model 1 DF 22cal I am studying real hard...
ymmv

[Whirligig]

Whirley
I have broken several of the linkage rods, since I have "Upped" the velocity/pressure of pumping on my 22 cal DF.

I went this route, I got all the parts that fit together, then measured all the hole diameters of all the parts, (pins/rods) etc
then I bought some reamers that were .0001" larger than the biggest hole/parts measured hole diameters,
(depending on where they were located), and then reamed all the matching parts for that reamer size.

During the measurements of all these parts, I found hole diameters that  were .010" or larger that fit these OEM parts,
and I had lots of clacking/noise when pumping with the OEM setup.

Since reaming all these parts/holes with a reamer diameter .0001" larger,
the pumping effort has been very consistent along with the fps readings etc. (No noise),

I have not broken any more pins/rods as I used grade 5/8 material for the replacement parts.
I have a Model 1 DF 22cal I am studying real hard...
ymmv

I'll admit I had to Google some of the terms you used, but that approach makes a lot of sense to me.

Just out of curiosity, what do you mean by "Upped" the velocity/pressure of pumping?" Do you just add more pumps than the recommended maximum of 15, or did you make other modifications? And what were the results on FPE after increasing the pressure?

Thanks,

-W

[Nvreloader]

Whirley

I got rid of the dead air space in the pump stroke, thru careful adjustment of the pump head,
which upped the fps at 10 pumps to around 800+ fps (IIRR), I thought I posted here what I did,
during this experiment (removing dead air space when pumping), I can't find the info still looking.

I think, I went the full range from 1 pump thru 15 pumps with 3 shots per pump test.
As soon as I find the info, I'll post the info here for you, IF I can get the search Dog to work for me.

[Whirligig]

Whirley

I got rid of the dead air space in the pump stroke, thru careful adjustment of the pump head,
which upped the fps at 10 pumps to around 800+ fps (IIRR), I thought I posted here what I did,
during this experiment (removing dead air space when pumping), I can't find the info still looking.

I think, I went the full range from 1 pump thru 15 pumps with 3 shots per pump test.
As soon as I find the info, I'll post the info here for you, IF I can get the search Dog to work for me.

Interesting!

Thanks!

-W

[Nvreloader]

Whirley

Here is some of the testing I did on the DF by just changing the air pump head adjustments,
and using Flat Wire main springs etc.  See info here:
https://www.gatewaytoairguns.org/GTA/index.php?topic=208652.0
I'll try to find the rest of the info...
Tia

[Whirligig]

Whirley

Here is some of the testing I did on the DF by just changing the air pump head adjustments,
and using Flat Wire main springs etc.  See info here:
https://www.gatewaytoairguns.org/GTA/index.php?topic=208652.0
I'll try to find the rest of the info...
Tia

Wow, that's a lot of experimenting and testing!

I read through the whole thread, and now I want to test my two Dragonfly Mk2s and compare the FPS at different numbers of pumps!

Unfortunately, it's cold and snowy here, so my own experiments will likely have to wat until Spring...

-W

[JPSAXNC]

Pumping causes condensation, the condensation mixes with lubes in the gun forming a thick mucus like sludge in the valve. The sludge takes up volume in the valve, changing the velocity until the sludge blows out.

[avator]

Pumping causes condensation, the condensation mixes with lubes in the gun forming a thick mucus like sludge in the valve. The sludge takes up volume in the valve, changing the velocity until the sludge blows out.

A good alcohol flush with get rid of that gunk. Pump it in, let is stand overnight and shoot it out, Then relube.