When this unit is lifting and main lift tops out it is a hard transition. (Big bounce). It will only do it in the first stage to the second stage. After that it is nice and smooth going up. When you come down when the second stage comes to its resting area there is a hard bounce in the carriage and then it's smooth all the way down. When you compare it to another Toyota the transion is nice and smooth. Seamless in all stages. We have removed the main lift cylinder and it looks good. Repacked it and installed new valve on bottom of ram. We have hooked hydraulics up from another unit and tested it. We even swapped the blocks and the check valves out from another unit, and still the same problem. The problem is in the upright or we are missing something in a cylinder. The upright doesn't hang up. The rails are even. Does anybody have any ideas?
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I did figure it out. The shaft is hollow inside. When you rebuild the cylinder the last step you need to do is install the piston and shaft into the shell. Push it all the way down and then fill up the shell with hydraulic fluid. Then you install the cap. This is how they are dampening it. When you go up, the fluid is pushed into the shaft, then when you come down the fluid will come back out of the shaft and fill the top chamber up. I like the design of it. But it is the first for me.
thanks for all your help
Just curios on the mast style -I am assuming it's a Triple??????I may have a tech report on this.......Maybe....
the carriage stop may be contacting the second rail. sometimes the p/m tech's will overadjust the freelift chains and this exact problem occurs. eventually it will break the stop off of the rail. there was a problem with the 6 series units mast geometry and adjusting the forks to be off the floor when fully lowered required shimming the secondary cylinders. there is an old service bulletain on this issue. im sure you've already checked this but just in case.
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