Cat haul truck suspension question

Hey FarmallMMark,

Which truck are you referring to? Just bought a dual charge kit to fill my 773. Yes they are nitrogen over oil. There is a set procedure to follow. Let me know which truck.
Glen

As far as I know, all Cat rigid trucks are independent nitrogen over oil suspension cylinders, there is a set procedure for filling them but basically if each pair, with the truck on level ground have the same amount of oil in them, are the same pressure and the same length, they are OK. You will find the proper procedure a little more complex.

A Caterpillar 777F. My understanding is that the trucks suspensions are all of the same design, but just with different specs.

That's correct.

So the oil and nitrogen are charged into the same cylinder? Nitrogen on top of oil? Are the cylinders similar to a standard single acting hydraulic cylinder? No accumulators or internal accumulators?

No accumulators they are just like a single acting cylinder, part of the filling procedure is to ensure there is no air left inside, only nitrogen, because the presence of oxygen can cause an explosion.
So get the instructions and ensure it is done properly, if there are no leaks, a top-up is seldom needed.

Ok, thank you. I'm a heavy machinery tech and I work a lot with hydraulic systems with accumulators, but I have never worked with Cat suspension systems before. I have an interest in this stuff and I'm always trying to expand my knowledge. Thanks again

Hi Team,
a fair bit was discussed on these Suspension Cyls. and some data posted in this thread, around post 67.

http://www.acmoc.org/bb/showthread.php?26596-Project-TONKA/page7&highlight=project+tonka

Not sure if I have a cut-away section drawing of one.
Cheers,
Eddie B.