Anschutz LG250 damper unit refurb

[Garvin]

I've put some pics of a refurb of the oil damper unit from an Anschutz LG250 on the US Vintage airguns site HERE if anyone is interested.

Thanks go to John Pennineway for the generous gift of spare seals and to Wonky Donky for his helpful advice.

[wonky donky]

Nice one Danny, even I could do it from that!

[Garvin]

A quick update on the subject of Anschutz match rifle spares etc: there are now at least two sources of remanufactured service parts for the LG250 and one for the LG380.

LG250 breech seals and piston bumpers/buffers can be found at jgairguns.biz (the buffer is ANS250-28, wrongly described as a piston seal).

The same spares for both the LG250 and the LG380 can now had from Beeman Australia.

Spare RSS 512/2 U-cup rod seals for the LG250 damper unit (see my US thread above) are available from Rhondama Ltd in Loughborough or other hydraulic seal specialists.

[pennineway.fswo]

Good work Danny. Very useful info.
ATBest
John

[hwtyger]

That mainspring is 1 spring instead of the original 2?

[Garvin]

That mainspring is 1 spring instead of the original 2?

What are you referring to?

The LG250 has a long mainspring and a short one. If you mean JG, he supplies only the long one.

[hwtyger]

Jgairguns only shows one spring?

[Garvin]

Jgairguns only shows one spring?

That's the long mainspring.

[hwtyger]

Garvin, did you see any sign of damage to the demper when you disassembled the 250?
Unfortunately, mine seemed to be total loss..
It has had a problem earlier, dunno exactly what.(probably caused a piece of wood to crack from the pistolgrip)
When removing the end pin, it was already weaked and/or bent, which caused the action to crack..Should've noticed the pin was in place kinda weird, like, not-straight, also was a little bent steel in one holecorner.
The demper in front was eaten away.
My theory is this; it had been shot too long with empty demper. Causing the wear on the demper outside and the stockcrack. The díd open it once probably, the grease was still very fresh. Too fresh for 25yrs old..
They probably forced in the pin, which weakened it for me..
#### happens..

By the way, do you know the weight of the damper when empty?

[Garvin]

Garvin, did you see any sign of damage to the demper when you disassembled the 250?
Unfortunately, mine seemed to be total loss..
It has had a problem earlier, dunno exactly what.(probably caused a piece of wood to crack from the pistolgrip)
When removing the end pin, it was already weaked and/or bent, which caused the action to crack..Should've noticed the pin was in place kinda weird, like, not-straight, also was a little bent steel in one holecorner.
The demper in front was eaten away.
My theory is this; it had been shot too long with empty demper. Causing the wear on the demper outside and the stockcrack. The díd open it once probably, the grease was still very fresh. Too fresh for 25yrs old..
They probably forced in the pin, which weakened it for me..
#### happens..

Nothing like that on mine that I noticed but it's an interesting thought that maybe prolonged use with an empty hydraulic unit could cause damage. Not sure of the damper weight.

Sorry to hear of your problems, hope you get it sorted.

[wonky donky]

Dampers on these guns are prone to corrosion which in turn can cause them to leak.

I have had cause to "right off" a 250 only a couple of weeks ago due to the damper unit breaking up causing the gun to recoil, this in turn created some internal play.
The knock on effect was the rearmost body tube pin split the body tube arond the location hole on the cocking lever side, the final nail was the cocking lever broke due to all the added strain.

[hwtyger]

That crack around the hole, that exactly what happened to mine..
So it ís cause by recoil, it's designed to survive withóut..
Read on BB's blog on pyramid that 250's are VERY prone to stock cracks in the pistolgrip too.

About the oil inside; Garvin, you used ATF. Was than recommended by Anschutz? I wonder, with bikes with suspension forks you can adjust its characteristics by changing amount and type (thickness) of the oil..How much oil is in it anyway?

Didn't see the seal you use on the rhondama site. Did you emailed them for this? Was it drop-in fit?
Did you replace the outside Oring as well? Any specifics for this? Or is that one an easy find..

[hwtyger]

My new 250 is very good! NO action rust! I already disassembled it, NO internal damage!Phew..
Gonna revise the internals, already ordered the breech seal, piston damper and spring.
About the damper seal, you still have a few Garvin?
I noticed theres a rubber behind the oildemper, in the endcap. This rubber should prevent the demper for hitting the endcap steel.
Did you replace this part? If so, with what?
Did you replace the steel pistonrings?

[Garvin]

• About the oil inside; Garvin, you used ATF. Was than recommended by Anschutz?
• How much oil is in it anyway?
• Didn't see the seal you use on the rhondama site. Did you emailed them for this?
• Was it drop-in fit?
• Did you replace the outside Oring as well? Any specifics for this?
• Or is that one an easy find..
• About the damper seal, you still have a few Garvin?
• I noticed theres a rubber behind the oildemper, in the endcap. This rubber should prevent the demper for hitting the endcap steel. Did you replace this part?
• If so, with what?
• Did you replace the steel pistonrings

?

Good grief hwtyger, that's a lot of questions.

To answer them in order:

• I think it was John pennineway.fswo or wonky donky who recommended using ATF. Anway, it's the right kind of stuff.
• As I said on the AVA thread, I didn't measure it but I guessed the damper holds about 35ml of oil, give or take 5ml.
• Rhondama should have the damper seals - contact them!
• Yes, the seals are push fit.
• I kept the original O ring, it was in good condition.
• No, I have no spare damper seals, sorry.
• I think the flat seal behind the damper in the end cap was cork originally, I'm not sure because mine had disintegrated. IIRC I fabricated one out of thin rubber.
• Yes, I did replace the steel piston ring but I don't think it was strictly necessary. Like on the FWB300S the wear on the piston ring is negligible.

Good luck.

[hwtyger]

That seal behind the damper is rubber on mine. How thick did you make the replacement rubber, you remember?
About ATF oil, there are a LOT of different ATF oils...Shame anschutz doesn't state which is bést.
Did you order the steel piston seal from anschutz? Or made one yrself?
Thnx again..