![]() ![]() Or even a small possibility that they installed the incorrect seal kit and it's just too tight causing the center cylinder to stick. If your center channels are raising prematurly then the center cylinder is restricted for some reason causing the fluid to divert to the secondary cylinders prematurly.įirst of all i would have the primary (center) cylinder rechecked to make sure the packing in the gland nut isnt dry or has blown out and is causeing a bind against the rod. If there are no restrictions in the system this is how it is supposed to work. The way the hydraulic system works on the mast is it is an equalizing type system, when you actuate the lift it sends fluid to the cylinders and if all is well the primary cylinder (center) is supposed to raise first, when it reaches it's max height and bottoms out the secondary cylinders take over. You say they replaced the center seal 1yr ago? Q//? I am thinking it's a valve sticking,(That's Correct)Īnd since to original post was dated, hopefully they got this fixed, and maybe will come back and let us all know what the problem really was. VerticalVicDude, I am not too sure your method of answering is all that clear or correct. Have someone else that the forklift tech you had look at it in the past, and get their price on repacking the center lift cylinder. ![]() The valves you might see at the bottom of a lift cylinder are more likely to be what I call a velocity fuse, where if a lift hose were to break or other wise loose all pressure, the fuse would prevent full speed dropping of the load. The reason one set of cylinder lifts before the other set is not a valve it is called "mechanical advantage" that while the load is shared by all the cylinders, the center cylinders have an slightly easier time lifting is why they move up first, not some "cylinder lowering control valve" that controls the mast staging. ![]() My instant guess is the seal in the center (first stage) lift cylinder on the piston is allowing bypass oil to get above the seal, (usually when just sitting and no weight or pressure is against the seal, so noticing this early in the day or ju8st after lunch?) and until the oil is forced back to the correct side of the seal by fully lifting. A couple of questons, when the lift is staging improperly, if you run the lift to it's maximum length up, does it then start staging correctly? is it only in the lifting action that the sections travel improperly, or do you sometimes only have a problem lowering? ![]()
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