We have a Hyster 60. This fork lift came from government surplus and the plate with the model number was removed, so I don't have that info.
The problem is when lifting the second stage lifts first.
Just for clarity, the first stage is lifted by a single cylinder until it reaches the top of the uprights, then the second stage begins lifting by two cylinders.
I have not been able to figure out what switches the hydraulics from the first stage to the second stage. I don't see any switches or valves on the uprights that sense the position of the first stage to cause the change.
So my question is what causes the change from fist to second stage lift? If anybody has any idea what is causing this problem, please let me know.
Thanks Glen
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The valve is in the piston assy at the bottom of the ram (chrome part the extends out when forks raised). The only way to service the valve is to remove the entire cyl from the machine & disassemble the cyl. Any competent hydraulic shop should be able to replace the valve for you.
That is what happens. When the second stage reaches the top the first stage then starts to raise.
I found the data plate for the mast. The model number is SS33.00-4.50 1219-1356883 The serial number is B603 (printed) B352.1 (stamped)
I was looking for the flow valve, I don't see any vale at the bottom of the first stage cylinder. I do see plumbing that goes to a box on the fire wall (for lack of a better name) and there are two lines that go to the two second stage cylinders. Could this be the location of the flow valve?
Thanks for your help.
if you lift all the way up until the stage bottoms and then the carriage goes up then I would definitely look at replacing the flow valve in the bottom of the free lift piston
Thank you very much for the reply. I will look into the check valve. There is a data plate for the mast still in place.
Glen
There is a check valve in the base of the free lift cylinder ram. Usually miss staging is caused by this check valve. You will need the mast model and serial number to get the correct parts. There should be a serial number stamped in the frame for the truck. The mast numbers are stamped on the stationary rail.
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