Hydraulic cylinders for rc construction models

[Alex39]

What do you think about this cylinders?
http://www.ebay.com/itm/331910578727...84.m1555.l2649

[bigford]

cant really have any thoughts, no real info is given

[Alex39]

Dimensions is 145/230 mm, pressure 25 atm.

[bigford]

is it double o-ring /what size it the thread for the fittings. they look real skinny
almost home made

[bigford]

OH and your the seller
alex393939 (123 )

[Alex39]

You are not right.
I want to buy this cylinders for my KAT excavator

[bigford]

if you have a KAT then buy the rc4wd cylinders they work great


video of the kat
https://youtu.be/1nSKkV7DrSA

[Alex39]

But they more expensive

[Cooper]

Originally Posted by bigford

OH and your the seller
alex393939 (123 )

Alex, where are you from? And how about a pic of the insides? That is how I could tell you what I think of them. What a coincidence you and the seller have the same name!! Cool!! I'd say buy them just cuz of that!!

[headers]

Magom have some pretty good prices on their cylinders also

[Alex39]

Originally Posted by Cooper

Alex, where are you from? And how about a pic of the insides? That is how I could tell you what I think of them. What a coincidence you and the seller have the same name!! Cool!! I'd say buy them just cuz of that!!

I'm from Poland.
I do not know how to explain the coincidence of names
I want to buy two cylinders for may KAT excavator and I wanted to ask whether the experience of the use of these cylinders is on the forum

[bigford]

I think there going to be as bad as the ones that come with the kat. Cooper built his own cylinders and gave
Me the Rc4wd ones.

[Alex39]

I try to buy this cylinders

[Doggy]

Question for people making their own cylinders: What thickess do you use for o-rings? Or what do these ones on the market use?

[Rimrock]

See it's a new brand, GSK, from Kalinigrad. They are possible not known to anyone here at the forum yet. Great if you buy them and test them out and write a report here. It's positive they are from brass, not aluminium as some of the Chinese ones.

[Rimrock]

Originally Posted by Doggy

Question for people making their own cylinders: What thickess do you use for o-rings? Or what do these ones on the market use?

Use 1.5mm thinkness (sometimes 1.78) for the piston and rod seals, 2 off at each location. To seal between the front piece that contains the rod seals, and the cylinder pipe I use also 1.5mm (x1) when enough space. sometimes need to use 1mm here if thigh space. The 1mm seals are more vulnerable for damage when putting the cylinder pieces together, so a more thick seal is better. One need to study the tables for seal groove clearances to get the correct size grooves etc. If one got a 8mm rod, one should not use a o-ring that is exact 8mm inside diameter, but better 7 or 7.5mm max to get a good fit.

[Alex39]

I'm wait new cylinders for my KAT

[Alex39]

Today I received two cylinders for my KAT excavator from GSK Earthmovers.

[Rimrock]

Originally Posted by Alex39

Today I received two cylinders for my KAT excavator from GSK Earthmovers.

what outside diameter?

[Alex39]

12 mm