Installation: Set your seal in place SKF recommends coating both shaft and seal with a thin layer of lubrication to help facilitate installation. Lip Seal Design Theory Temperature effects at the interface of the lip seal element and mating shaft or sleeve are crucial to seal performance. PTFE’s high temperature rating and tolerance of a wide range of chemicals make it suitable in Aerospace Jet Engines as a static or dynamic seal. $18.28 $ 18. Examine the new seal and notice the direction of the outer lip. Lubricate the seal with oil and twist it over the output shaft. Place the holes opposite of each other. 3,847 1. ), 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. Verify correct lip seal installation. While inspecting the shaft, you typically will see a contact or wear zone where the lip seal was riding. Streetside Tools SST-0015 - Universal Lip Seal Installer/Remover Transmission Tool. If you are proactive in your approach to rebuilding and installing equipment, you can give your lip seals and machinery a fighting chance at survival. Hereby, the lip is pressed onto the shaft surface by means of a spring ring. Painting over a seal or having dirt built up around it can create excessive heat and quickly degrade the elastomer. To help your lip seals stay as healthy as possible, you must keep your oil clean, cool and dry. Spring-loaded seals are typically used with oils and can be found on a wide range of equipment. As a result of the rotational movement, there is a sealing gap of approx. i am replacing a wheel seal. Typical applications include conveyors, vehicle wheels and greased components. They have excellent resistance to petroleum oils, water and hydraulic oils, but what really sets these seals apart is their low cost. Nitrile seal life decreases by a factor of two for every increase in temperature of 57 degrees F. The oil level can be another factor in a lip seal’s lifespan if it is too low. what does the air side mean? Excessive temperature is the leading cause of seal failures. An oil seal can also called flexible lip, radial lip, or rotary shaft seal. Also, verify that the lip seal is still in place. asked by: Linda S. 0. Post May 06, 2010 #1 2010-05-06T04:13. Regardless, the fact remains that lip seals are vital machine components. 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. It is important to avoid damage during installation, especially to the sealing lip. Assure proper seal direction. (can't believe most of you didn't have a problem with this.) fluids can only flow in one direction— from the lip seal’s back to front—due to the flexibility of the lip seal material. Installation of Seal Over Splines: The installation tool is lubricated, preventing seal lip damage from splines, keyways, and unchamfered shafts. Most of the lip-type seals that I have installed have the lip facing the outside of the engine - like the timing cover seal. His work includes instruction manuals, lesson plans, technical brochures and service bulletins for the U.S. military, aerospace industries and research companies. Correctly installed as shown, the lip should extend inwardly, toward the engine crank case (circles). Cover all seals before painting, keep the oil at the proper level, make sure oil coolers are functioning correctly, and select the right seal design and material. The lip seal is pointing in the correct direction. The sealing lip of oil seals is usually manufactured of elastomer material, and is in contact with the surface of the rotating shaft. The sloped part of the lip faces outward. I’ve often seen a new lip seal start to leak as soon as it was put into service. 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. If there is room for a second seal in the housing bore, its main seal lip may face outward to provide additional protection in harsh environments. Hathcoat is an accredited technical instructor through Kent State University and certified in automotive service excellence. When installing the oil seal, … I’ve seen guys install seals with a punch so they wouldn’t have to take the extra time to locate the right tool. Any oil leaks around the seal should be a red flag to investigate further. They keep oil or grease in and help keep contaminants out. 8milelake 50 Piece Custom Bush, Bearing, and Seal Driver Set. For these instances, I prefer to use a pipe that is large enough to slip over the shaft and makes good contact with the lip seal’s outer shell. For metal-cased shaft seals, the bore must be lubricated but it is not imperative that the seal is. 3,847 1. Selecting the proper lubricant and seal material can help in these colder environments. Most look like a socket set that will position the seal squarely into its bore. ), The case is not damaged (no nicks, cuts, dents, etc. and it isn't as simple as just bolting in the new knuckles! Sealing rings must be handled and fitted correctly. This is essential for rubber–covered seals. The installation instructions explicitly state, "main lip shall face front of engine", but there is no diagram or illustration of the correct installation. OTC 4508 Professional Style Seal Puller. The bevel of the lip fits inward. They can be used in a variety of applications from slow-moving equipment to high-speed rotation and in temperatures from below freezing to more than 500 degrees F. To be effective, a lip seal must maintain proper contact with its rotating counterpart. 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. Other seals will leak initially but then stop leaking once the seal material has seated to the shaft. Perhaps the lip seal is the reason the piece of equipment was pulled from service due to leakage. 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. Shaft seals are used on rotating, reciprocating, and oscillating shafts to contain oil and grease and exclude contaminants. 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. Oil can enter this gap, which serves to lubricate the sealing lip. The sloped part of the lip faces outward. The metal case is coated to help prevent it from leaking and help it fit tightly, and the rubber lip is made of special polymers to keep it flexible over years of service. Some seals have a garter spring behind their sealing area. Failure to properly set the seal perpendicular to the shaft can cause immediate leakage. This typically is due to improper installation. There are various contacting patterns as well as non-spring and spring-loaded seals. Pay attention to the orientation of the seal lip. Just be sure to set the seal in straight and at the correct depth. If the shaft has a breast or keyway, you can use a mounting tube. Upon startup, the vibration and movement caused the seal to come out of the bore and spin on the shaft. 7. Fitting Caution! When analyzing any lip seal failure, look at the seal, shaft and bore. This will be influenced by proper selection, installation and care of the seal once it is installed. If you have a used shaft, it likely has developed a wear ring where the old lip seal was placed. Its temperature range is minus 40 degrees F to 400 degrees F, depending on the specific compound. It is not necessary to lube the O.D. There is adequate ventilation of equipment when stored or in operation. The seal type for oil seals and grease seals can be oil seals or other types. Furthermore, the primary rod seal’s lip is discolored due to inadequate lubrication. There are a number of products on the market dedicated to this single task. If you install one incorrectly, oil will bypass the seal. 1 μm at the lip edge. ), There is adequate ventilation of equipment when stored or in operation, Proper installation tools are used to avoid damaging seals, Equal pressure is applied during installation to ensure the seal is not cocked, Check for cracked or deteriorated elastomer, Check equipment for excessive temperatures. 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. The oil seal should be installed with its sealing lip facing the surface being sealed and it should remain open. As with all split seal options, it offers easy installation and replacement without the need for teardowns. The bevel of the lip fits inward. 95. In the past, a simple lip seal consisted of a leather strap on a wheel axle. 4.2 out of 5 stars 95. JellyBeanDriver. The main seal lip usually faces the lubricant to be sealed in. 6. Surface Stop Installation: The bottom of the installation tool meets the machined housing face. Worn seals can cause leakage, plugged breathers or damaged bearings that allow radial motion. There must be an interference fit in the bore and on the shaft. Among the things to look for when inspecting lip seals include deteriorated or cracked elastomer. Push it into its housing and use a seal driver and hammer to tap it into place. $21.95 $ 21. does the metal go on the inside or outside? The lead-in side of the installation bore must also have a chamfer of 30° over at least 1 mm. Drill two small holes in the metal ring that holds the old seal in place. This will allow grease to pass through the seal during greasing, but will prevent dirt, grit, and water from entering the bushing area. 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… Product Unboxing: Hy-Pro Compact Offline Filter, Product Unboxing - Vaisala Indigo520 Transmitter & MMP8 Probe, Product Unboxing - Vaisala MM70 Meter & MMT162 Transmitter, Product Unboxing - The Conserver® Oil Purification Unit, How to Cost Justify a Lubrication Program, Keeping your Lubrication Program in the Crosshairs, of lubrication professionals say their plant uses lip seals to control contaminant ingression, based on a recent survey at, The elastomer is not damaged (no nicks, scratches, cuts, etc. 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. Adding a garter spring will help with any runout that can be measured. If this is unavoidable, there are products that you can slip over the shaft to help with the damaged surfaces. If the slope faced inwards, the oil would flow out without any resistance. Slide the seal over the plastic sleeve and crank- shaft, and install the seal into the housing bore. Any contamination in the oil will get into the contact patch and deteriorate the shaft and elastomer. Also, verify that the lip seal is the correct size. As a result of the rotational movement, there is a sealing gap of approx. The shallower the slope on the oil side of the seal the wetter the seal will run. Do not use silicone on the seal backing. Oil seals, also known as metal-clad seals, are directional. This can be caused by misalignment, shaft imbalance and manufacturing inaccuracies, to name a few. The spring is positioned such that axially the centerline of the spring is biased to the air side of the lip contact point. So if logic stands, the lip with the spring, shape like a V should be the oil seal and the other lip should be the one stopping the contaminant from going in which mean the seal is wrongly install. When oil pressure presses … All of these materials have specific applications and precise temperature ranges. Proper installation tools are used to avoid damaging seals. 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). Remember, in order to keep your lip seals in good operating order, you must maintain the sump. For best seal performance, industry standards recommend that the lead angle of a shaft be 0 degrees +/- 0.05 degrees (+/- 0 degrees +/- 3 minutes ). Applications with higher pressures should employ a special seal design. This can be attributed to clogged breathers or non-vented sumps. Installation and maintenance should be performed as follows: 1. Your thoughts please. 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. Without good breathers, all the dust and dirt that gets into your equipment can destroy not only your bearings and gears but also your shafts and lip seals. shaft with the same advance (0.300 in. Work side-to-side until the seal is removed. The bevel of the lip fits inward. If the slope faced inwards, the oil would flow out without any resistance. Depending on the direction of installation, it might be advisable to use a chamfer. This is a telltale sign that heat is an issue. Proper Direction To Install A Hub Seal On Trailer. A non-spring seal generally will be less expensive and be able to retain viscous materials like grease at slow shaft speeds. 4.5 out of 5 stars 117. This is usually quicker and more cost effective than replacing a shaft. Jack Hathcoat has been a technical writer since 1974. Be sure to take into account the process and environment before selecting a seal material or making a switch, as the correct material can prevent a costly failure. It is provided by our preferred supplier, Trelleborg.