Get the online parts manual

Speaking to someone in the trade today who had a similar problem some years ago & it turned out to be a tight spot caused by the chrome being slightly out of true. I now think this is more than likEly
the fault because any air trapped would surely have found a way out by now

That may be the problem. Find out exactly what valve they replaced. If the accumulator valve malfunctions it can cause all kinds of problems.

It is a telescopic type ram.Unfortunately I don't even have the truck serial number but it could be the internal
valve thats faulty because the company who overhauled the cylinder said they had to have one made after stripping the unit

In thinking about your lift, what is the complete serial #, including the letter at the end? Could be you have an accumulator style cyl with a malfunctioning valve at the botton of the ram? The accumulator style of cyl has no bleeder.

I would still investigate if the upright is sticking as I've never seen air cause a staging issue. Is this s telescoping cyl?

"The outlet is about an inch below the top ,brass securing ring on left hand side and configured so that the threaded internal port
is pointing down and parallel to the cylinder."

This sounds a lot like a bleed back port to me, they used to use them on old cylinders in case the packing inside had any bypass and fluid got on top of the ram inside... when the piston got to the top of the stroke it would allow the excess fluid to go back to the tank... which is what i was talking about earlier on some older lifts. They would have a return hose that went back to a port on the tank.
So definitely a manual would be very helpful.

i checked at our shop and did not find anything this old there... sorry about that...
Wish i would have found something...

Good luck

No problem,been on going for 5 months now

If you can wait until Monday, I can take a look at one of these old S30A models and maybe come up with a idea how to bleed it.

Thanks for the info guys.The outlet is about an inch below the top ,brass securing ring on left hand side and configured so that the threaded internal port
is pointing down and parallel to the cylinder.As such,if a screw were
fitted it would not actually enter the inside of the cylinder body.
The hydraulic company who did the overhaul are now saying that the fault is not their concern & want payment from me.(although they have not seen the truck in action)My customer isn't going to pay until it's right so any information from a Hyster manual would be great.
Hard to get information in the UK since Barlows closed

when you say you found it on the cylinder shell but the port is blocked? where at on the cylinder shell did you find it? Was it near the top of the shell where the gland nut screws on?
How close to the top?
if it was within a couple inches from the top then that may be a set screw and not a bleed port, some of these old cylinders had set screws that were designed to hold the packing nut in place so it couldn't back out.
Usually if there is a bleeder in the shell it will be several inches down from the top of the cylinder shell but in most cases it is in the top of the ram.

I am going down toward the shop tomorrow, i'll look around and see if they happen to have any old manuals there for this model.
If they do i'll **** it up and scan the parts page diagram for you.

In reading the thread I see the staging is off. I don't think air in the cylinder is your problem. Does your lift have rollers between the channels or is it a slider upright with brass wear plates?

Why is the cylinder unusable? It'll be bouncy for a while until the air bleeds out on its own. Might take awhile but not a big deal.

Wish I could but the fiche is so worn out that it does not print off so you can read it.

Any chance that Partsguy5 can e mail me
an image of microfiche page showing the air/bleed
outlet on cylinder body as I need to prove that the
guys who did overhaul should have cleared this to
make it useable.Thanks in advance

Thanks Swoop,found it on the cylinder shell
but unfortunately no screw inside & the
port is blocked into internal cylinder ,maybe
by seal or bushing.Trying to get hydraulic
company who did overhaul to go out on
site to see the problem

yes like mrfixit said, look for a small screw in the top of the center cylinder, sometimes they put a bleed screw on the side of the cylinder shell so i'd look in both places but generally they put it where it will release the air from the best location where it gets trapped which in most cases is the last section that gets oil.

When you bleed the air out (once you find this screw) only lift it up a couple feet off the ground and only crack the screw till the air starts coming out. If you loosen it too much it could pop out and then you will have a big mess on your hands so be careful.

good luck

Thanks for the info. I will check when I return to customers site.
Told them to use it a couple of weeks hoping any air will find it's way out.

There may be a air bleed screw right in the top of the center chrome shaft.

Hi guys, I know this is an old post but hopefully you can help me.I have had one of these 3 stage telescopic cylinders re-worked.
Took it to a hydraulic specialist who had all rams re-chromed,new seals made up.Fully stripped & re-built
When fitted back onto truck there seems to be an air lock that wont clear.Lifts to highest extent & holds.Okay until upper section is lowered into larger,outer section which will slowly drop an inch or so when lever is released.But then holds load.
There is a small outlet on top of main cylinder body (about 1/4 inch internal diameter with fine thread)
I think this is maybe a vent hole ,but there is no screw within ,but if a small screwdriver is pushed up the hole it is possible to feel a hole into the main cylinder body ,but nothing comes out.
I have tried fully extending ,up & down for about an hour but will not clear.