11/19/2023 0 Comments Clark forklift hydraulic cylindersNext question is if it is one cyl or both. Any system I have seen has had a filter somewhere, either in tank or in line. I always try to find the problem before I try to fix it. Seals may very well be the cause, but if the pivot pins or bearings are frozen up, that will cause problems. The same dirty old gritty hydraulic fluid does a number on those O rings, although I have changed some of those that leaked but I couldn't see anything visibly wrong with them. You would think the cylinder seals would be the next suspect, or seals in the spools?Ĭylinder piston O rings would be my guess. I'll check the hose setup, but I assume they are right or they wouldn't lift it at all. If they are right, I will get with you on how to do other checks. If hoses are right, the possibility of seal damage exists. There are other ways to check, but if not done correctly they are very dangerous. These are usually x number of inches in a set time. Even new lifts have a drift factor set by manufacturer specs. Trace hosing from one port and it will split somewhere, but both will go to either top or bottom ports on cyls. Simple way to check is to tilt cyls to max tilt forward so mast will not move on you, then find spool valve. If it leaks down fast, it needs new O rings somewhere, cylinder or valve. Most hydraulic systems do leak down a little even when fairly new. The easy way to fix it would be to give that machine to me. It is almost never left outside to keep the moisture out. I never do that, but when I rebuilt the hydraulic system 4 years ago, I scrubbed out the inside of the tank and flushed out all the lines and pump. So always clean hydraulic filters once a year, and you should replace the fluid at that time. I have had all the cylinders rebuilt on my forklift and when I asked about bleed down of the main mast cylinder I was told the spool valve would have to be replaced because after 50 years and dirty fluid it slowly wears out the valve body assembly. It was $100.00 to check out the spool valve and test it. I also had a hydraulic leak and took the spool valve to my favorite shop and it turned out to be a 50 cent O ring. Works great for digging out logs I wish to cut from a pile. I now have 30” of travel at the tips of my 60” forks. If memory serves me correct it was about $450.00 per cylinder. I had both the tilt cylinders for my forklift with a stroke of 4.25 lengthened out to 8 inches. It sounds to me that the spool valve might have something stuck in it. Bunch of fiddling to get it slid over the dogs enough.Ĭlick here for higher quality, full size image Hard to make that cut through the middle when I've only got 28" between the guides. Must have put it into the tree when it was 3" in diameter. Found a nice bolt smack dead in the middle. 33" diameter small end (this picture is looking at the small end). Does this tell us anything about either the hydraulic spool or the cylinder?Īlso took this to show the big ash log I cut today, but now it doesn't look so big. Acts like the hoses on one cylinder might be reversed. The other thing is that even when empty, trying to tip the mast back dogs the engine terribly, like it's fighting a heavy load, but everything looks factory. Would one assume the cylinders need rebuilding or possibly the hydraulic valve itself? No oil leaks out anywhere. I've got this old offroad forklift and when I get a heavy load on the front, the cylinders that control the mast tip slowly leak down.
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