Cat 518/528 valve

[JustinW_NZ]

Hi all

I have a cat 528 skidder which aint going no where since the treadle valve finaly stopped holding any air, so i cant get the brakes off!

Does anyone know if the cat 518 valve is the same?
And even better a replacement part model/name/anything?

The one ive just pulled out i cant find any reference too.

Thanks in advance
Justin

[coxy]

would one off a big truck work

[mike_belben]

Any chance its just an O ring?

[Riwaka]

An aftermarket online catalogue shows five different sections for the 518 brake pedal valve assembly (separated by machine serial number.) The 528 shows 2 sections for the brake pedal valve assembly.
The Cat 528 part number  is listed as 3V1458  which cross references to a Haldex KN22150/KN22150X   (truck valve assembly)

Given the terrain the 528 likely operates on; you might ask DC Equipment whether they have done any 'modern' aftermarket skidder  brake upgrades. (Yarders also use air brake valves). If they have found the most reliable brake valve etc and modified the pipe work etc.

This truck part Co stock around 200 types of valve. https://www.ctsltd.co.nz/valves.php, also trt, transpecs etc
This list gives some idea of the number of different cat loader etc treadle valves.
https://avspare.com/spare/caterpillar/treadle/

[JustinW_NZ]

Thanks for the replys!

And thanks Riwaka-Through those numbers i tracked one down WAY cheaper than I can locally and its on the way...

Cheers!

Justin

[JustinW_NZ]

Hi guys

After buying one of the above parts and parking it all in the shed while I was away for the last many months...

I find myself looking at a pile of parts thinking oh dear...

Anyone have a photo of the part install into one of the cat skidders?
It seems like ive 'missplaced' a little part which allows the new valve assembly to bolt to the yellow plate that the pedal rides down on.

Take a look at the picture and let me know?
Old ones blue, new ones the silver...
The small blue part is the outer shell which goes on top of the new valve part and has the piston that is pushed onto the sprung part.
just seems like a spacer is missing?

Ideas?