It says to use brass tools but he uses steel. Do not use a pipe wrench on the piston rod nut. Do not cut the u-cups off in this fashion. This process is very dangerous. He is a seal guy and not a fluid power mechanic. I know because I am.
If this is a video on seal identification then it falls short with comments like" it feels like an N70" and others about how the part feels which is no good for discerning what kind to order.
To the couple gentleman that left less than stellar replies: It’s obvious he’s not a mechanic, it’s also obvious he used different tools than one usually would, but did you not get the jest of the video? It was about helping end users learn about seals and helping them identify seals. Hell, in a world where a machine is now obsolete after 10 years people need all the help they can get. I’ve been in the hydraulic world long enough to know we don’t always have the right tools and we also don’t get the tools we do get in either Brass or Stainless like some Engineer recommended, so take it with a grain of salt and give credit where credit is due. This gentleman got most people to smile with his bionic hands and magical finger snaps all while helping others that need it. We just made a cylinder Head (or packing gland) for a large John Deere front end loader. It was broken when a large rock came over the back of the bucket and wedged in between the Head and a cross member of the loaders lift arms. My customer called Deere and was told the Head was $5,000.00+ and a new cylinder was over $12,000.00. Key word is WAS as both the Head and entire cylinder are obsolete. After weeks of hunting my customer brought it in and we spend the next 3 days making this monstrosity, but it saved the cylinder. He was even more excited that I had all the seals for said cylinder in stock, so we reassembled and tested the cylinder before sending it home. Part of my point is what he taught most likely helped several people. I wouldn’t recommend using a pipe wrench or using a knife, but I’ve done both on jobs when they were the only tools available. Being professionals (?) there’s no way you can convince me you haven’t done the same thing, unless you’ve only been doing this for a couple years. I’ve done it long enough that there aren’t many cheats around that I haven’t used, or at least tried. Give the man some credit, he did a good job considering it’s not his job. Now you can reply and correct me, I await your superfluous answer(s).
Hi I have a bobcat and right underneath the wiper seal there’s what you called a u cup seal sometimes there’s a spring inside the seal other times there’s just a sold piece of rubber what’s better and will the one with the spring last longer or the same ?? Thank in advance
A u-cup can be loaded with a spring or a rubber O-ring energizer. What we call either a loaded lip seal or a Polypak, a U-cup loaded with an O-ring is very common and acceptable for most applications. Spring-loaded U-cups are used in more specialized applications, for example, for higher temperatures, compatibility with certain chemicals, or in specific industries like oil and gas. The outer seal material will also change its properties. I’m not sure how long either will last, and it depends on the application to determine which is more appropriate. The life will be limited by the material of the u-cup, which is typically going to be urethane. The spring will not take a compression set as quickly as the o-ring, but the urethane will still take a set over time. In most cases, if it is a urethane seal, a standard o-ring loaded will be just fine. If you'd like to speak with someone at Allegheny York please call 717-266-6617
My inner gland seals are crumbling. How can i measure what it takes? Also is the piston aluminum? Maybe that why no wear band. Aluminum softer than steel
There isn't a good way to measure the groove diameter inside the gland without proper tools. The proper tool would be internal calipers. You can try to measure the cross section of the seals to figure out the OD. The rod diameter plus two times the cross section will give you OD of seal. Not sure the context for the piston being aluminum or not. Typically wear bands are used on cylinders where there is a chance of side loading, such as in construction equipment where there are a lot of extended rods and horizontal cylinders. Cylinders that are unlikely to experience side loading, such as a vertical cylinder on a press, typically do not have wear bands. You could call our service center at 717-266-6617 if you need further assistance.
Thanks for the input. We know the tools used are not necessarily the ones a professional repair service would use. We don't do the actual repair work on the cylinders. We supply the seals that hydraulic service technicians use. This vid is meant as a way to identify the seals, not as a step by step on how to repair a cylinder start to finish.
nu am vazut pana in prezent cum se elimina sicanele produse pe suprafata interioara a unui cilindru,si care ar fi diferenta dintre diametrul nou si diametrul vechi (nominal) .