There is only a slight extrusion tail at the back-up ring of lip seal 2 and nearly no visual damage of the sealing element. I took some more pics. what does the air side mean? I’ve seen a few pumps that had the wrong seal installed. Any contamination in the oil will get into the contact patch and deteriorate the shaft and elastomer. does the metal go on the inside or outside? Keep in mind that the lip seal will need to be resized for the added sleeve. This will allow grease to pass through the seal during greasing, but will prevent dirt, grit, and water from entering the bushing area. Correctly installed as shown, the lip should extend inwardly, toward the engine crank case (circles). It should have a smooth action. The primary purpose of a lip seal is to exclude contaminants while retaining lubricants. Fitting Caution! It is not necessary to lube the O.D. Applications with higher pressures should employ a special seal design. Place the holes opposite of each other. Typical applications include conveyors, vehicle wheels and greased components. This is a telltale sign that heat is an issue. Of course, it is always better to exclude contaminants than to try to remove them. OTC 4508 Professional Style Seal Puller. Among the things to look for when inspecting lip seals include deteriorated or cracked elastomer. ), The case is not damaged (no nicks, cuts, dents, etc. The sloped part of the lip faces outward. Do not use silicone on the seal backing. Without removing the protective plastic sleeve from the seal, slip the larger end of the sleeve over the crankshaft flange. Installation and maintenance should be performed as follows: 1. If you’ve ever pulled out a lip seal and seen a groove cut into your shaft, this is probably due to particle contamination. A 2 in. Also, verify that the lip seal is the correct size. Pay attention to the orientation of the seal lip. When oil pressure presses against the inner bevel, the lip of the seal pushes out. A seal lip facing outwards prevents the ingress of dust and contaminants, Figure 6, . The bevel of the lip fits inward. 2. Worn seals can cause leakage, plugged breathers or damaged bearings that allow radial motion. Perhaps the lip seal is the reason the piece of equipment was pulled from service due to leakage. Check that the part of the shaft that rotates within the seal has a fine surface finish (free from scratches and burrs). The spring is positioned such that axially the centerline of the spring is biased to the air side of the lip contact point. Any oil leaks around the seal should be a red flag to investigate further. Elite Member. 28. Other options New from $12.42. 4. There are various contacting patterns as well as non-spring and spring-loaded seals. The increased friction of seal lip #3 increased the entire system’s temperature and led to higher wear on the back-up ring. Selecting the proper lubricant and seal material can help in these colder environments. This material functions well at temperatures of minus 40 degrees F up to 275 degrees F. Nitrile lip seals cover most applications in industry from new equipment to replacement seals. and it isn't as simple as just bolting in the new knuckles! If you install one incorrectly, oil will bypass the seal. Installation direction Shaft d1 h11 d3 R Y Z Medium Pressure Rz 1 to 4 μm plunge ground Figure 4 Installation of the Radial Oil Seal Depending on the installation direction (Yor Z), a chamfer or radius on the shaft is recommended. (can't believe most of you didn't have a problem with this.) 6. Most look like a socket set that will position the seal squarely into its bore. This is the only way to ensure that they fulfil their sealing function correctly for a long period. Other seals will leak initially but then stop leaking once the seal material has seated to the shaft. The other lip closest to you or I should say closest to the face of the seal with the # is more like a wiper lip and is shape going outside. The ), The bore is free of defects (no nicks, debris, roundness, etc. Front inner seal installation direction? Because the bevel is inward, the seal has some resistance. Drill two small holes in the metal ring that holds the old seal in place. Hereby, the lip is pressed onto the shaft surface by means of a spring ring. Anyone in the maintenance field who has repaired a pump or gearbox knows the one component that always seems to get replaced during a rebuild is the lip seal. The most common lip seal material is nitrile (Buna-N). Use a screwdriver and insert two sheet-metal screws into each hole and use vise-lock pliers to pull out the old seal. The seals also have special characteristics that make them durable in the hot oil environment. Flushing the sealing surfaces can take place during shutdown, or while the pump is in service. Depending on the direction of installation, it might be advisable to use a chamfer. There must be an interference fit in the bore and on the shaft. I’ve often seen a new lip seal start to leak as soon as it was put into service. This can be caused by misalignment, shaft imbalance and manufacturing inaccuracies, to name a few. hbspt.cta.load(3951034, '0185d019-b885-48b3-81bb-598c6269bb64', {}); Other seal materials that can be used with petroleum oils include Aflas, Simiriz, carboxilated nitrile, fluorosilicone, highly saturated nitrile (HSN), polyurethane, polyacrylate, FEP and silicone. Once the seal material has been selected, the next step is to consider the seal’s construction. Most of the lip-type seals that I have installed have the lip facing the outside of the engine - like the timing cover seal. Common configurations include single lip, double lip, triple lip, and four or more lips. As a result of the rotational movement, there is a sealing gap of approx. Excessive temperature is the leading cause of seal failures. FREE Shipping. hbspt.cta.load(3951034, 'c99217f3-09e7-4751-bc3a-7739dac44a0e', {}); Garrett Bapp is a technical consultant with Noria Corporation, focusing on machinery lubrication and maintenance in support of Noria's Lubrication Program Development (LPD). If you can find something that catches the outer casing, you can prevent damaging the inner metal ring that attaches to the lip seal material. The lead-in chamfer angle must be 30° to 50°. You should never set the contact patch to a previous contact point. lip opening facing the appropriate direction. This typically is due to improper installation. By nature, lip seals function by maintaining friction. Installation: Set your seal in place SKF recommends coating both shaft and seal with a thin layer of lubrication to help facilitate installation. The sloped part of the lip faces outward. Your thoughts please. ), The garter spring is properly placed (if used), The assembly lube is compatible with the lubricant in operation, The elastomer is of the proper specification, The lip seal is pointing in the correct direction, The shaft is free of defects (no nicks, scratches, grooves, etc. The lip seal is pointing in the correct direction. They keep oil or grease in and help keep contaminants out. For metal-cased shaft seals, the bore must be lubricated but it is not imperative that the seal is. Excessive pressure is another potential cause of lip seal failure. Post May 06, 2010 #1 2010-05-06T04:13. Furthermore, the primary rod seal’s lip is discolored due to inadequate lubrication. Cold temperatures can cause seal embrittlement. There are a number of products on the market dedicated to this single task. TO INSTALL THE SEAL: The seal should be installed dry, do not lubricate the crankshaft or the main sealing lip of the seal. As with all split seal options, it offers easy installation and replacement without the need for teardowns. Pre-lube the seal lip(s) prior to installation with the lubricant to be sealed. 3,847 1. A lip type seal (3 A) has an annular casing ( 31), a plurality of seal lips ( 32, 34) and a rear surface support ring ( 35) arranged at the rear side.The casing (31) is installed to an inner circumferential surface of a seal installation part ( 1 a) of a shaft hole housing ( 1) of an equipment through a main gasket ( 36) made of rubber state elastic material. Streetside Tools SST-0015 - Universal Lip Seal Installer/Remover Transmission Tool. The oil seal should be installed with its sealing lip facing the surface being sealed and it should remain open. When installing lip seals, make certain the job is done correctly. The dimensions for this are shown in Figure 4 and Table II. Clean the surface where the old seal was installed. I’ve seen guys install seals with a punch so they wouldn’t have to take the extra time to locate the right tool. The bore is free of defects (no nicks, debris, roundness, etc.) Lip seals seem to be on almost every piece of plant equipment, so why not take the time to learn how to correctly select and install them. Prior to installation, make sure that the housing seat is clean and that the shaft and the seal itself are properly greased or lubricated. The rotary oil seal is typically pressed into a stationary bore while the inside of the rotary oil seal is in contact with a rotating shaft. Just be sure to set the seal in straight and at the correct depth. Lubricate the seal with oil and twist it over the output shaft. His work includes instruction manuals, lesson plans, technical brochures and service bulletins for the U.S. military, aerospace industries and research companies. Installation Instructions for: Sealant. Check that the end of the shaft is free from burrs and beveled, so that the sensitive seal edges are not dam-aged during installation… Lip seals should also be kept as clean as possible. Proper installation tools are used to avoid damaging seals. 4.2 out of 5 stars 95. Upon startup, the vibration and movement caused the seal to come out of the bore and spin on the shaft. 8milelake 50 Piece Custom Bush, Bearing, and Seal Driver Set. For best seal performance, industry standards recommend that the lead angle of a shaft be 0 degrees +/- 0.05 degrees (+/- 0 degrees +/- 3 minutes ). Spring-loaded seals are typically used with oils and can be found on a wide range of equipment. These tools can work well if selected carefully, but most off-the-shelf versions aren’t as effective, especially when a shaft is already installed. SCE recommends a light layer of Gasgacinch on the seal backing and on the main-cap-to-block mating surface outboard of the seal. Painting over a seal or having dirt built up around it can create excessive heat and quickly degrade the elastomer. Different elastomers will tolerate varying amounts of runout. The basic theory behind the O-Ring Loaded U-Cup is that when you add a "loader or energizer" to a lip seal, you turn it into a squeeze seal that provides high sealing force at low pressure. PTFE Lip Seal Design Guide exists separately from other Parker EPS market-specific publications precisely because virtually every industry has specific needs for the unique physical and chemical properties of these remarkable seals. JellyBeanDriver. Installation of Seal Over Splines: The installation tool is lubricated, preventing seal lip damage from splines, keyways, and unchamfered shafts. 3,847 1. In order to exclude contaminants numerous types of dust lips or exclusionary lips may be used. Install the seal. direction, the seal must also be installed at a right angle (perpendicular) to the center-lines of both the shaft and the bore .” B ecause a shaft seal should never run without proper lubrication, both the seal lip and the shaft should be lubricated (typically with the same oil or grease being sealed) prior to installation of the seal. If the slope faced inwards, the oil would flow out without any resistance. The main seal lip usually faces the lubricant to be sealed in. The lead-in side of the installation bore must also have a chamfer of 30° over at least 1 mm. Seal Orientation. Hereby, the lip is pressed onto the shaft surface by means of a spring ring. This spring keeps tension on the sealing surface to keep it tightly against the output shaft. Housing Stop Installation: The bottom of the seal is flush with the interior shoulder of the bore. As temperatures rise, the lubricating film becomes thinner, resulting in dry running conditions. Adding a garter spring will help with any runout that can be measured. The sealing lip of oil seals is usually manufactured of elastomer material, and is in contact with the surface of the rotating shaft. An oil seal can also called flexible lip, radial lip, or rotary shaft seal. All of these materials have specific applications and precise temperature ranges. in 30 seconds at 60 RPM) has a lead angle of 0.0912 degrees = 0 degrees 5 minutes 28.3 seconds. The sealing lip of oil seals is usually manufactured of elastomer material, and is in contact with the surface of the rotating shaft. This is essential for rubber–covered seals. Push it into its housing and use a seal driver and hammer to tap it into place. The bevel of the lip fits inward. Not having the proper size can result in the seal rotating on the shaft or becoming dislodged from the equipment. Likewise, the hotter the oil becomes, the more wear and tear will be exerted on the seal. 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