01.Tell tale signs of pinion seal leakage are seen here. Very slight dampness is no cause for alarm; leakage like this is reason for seal replacement. Note the large vibration dampener on this 8.8-inch rear axle, which was incorporated on some of these rear ends to reduce driveline harmonics.

We recommend talking to our experts to ensure accurate calculations. Our team will gather the relevant details about your application and ask the necessary questions to determine the appropriate service life calculation for your bearing. We will consider variables such as multiple bearings, environmental factors, and stroke distance, which can affect service life..

When comparing static and dynamic load values, consider the lowest value of the two as a starting point when assessing the bearing’s ability to carry the expected load. When specifying a bearing, it’s important to already know the weight of your static load and possibly your lifetime requirement, too. This information, along with the dynamic load rating, will help determine the lifetime capacity of the linear bearing system.

What is static loadingErgonomics

The static load capacity is an important factor to consider when evaluating whether a system can withstand shock loads, repeated loading and unloading, and emergency stop conditions. If a bearing is subjected to a load that exceeds its static load capacity, the raceways may develop brinelling, resulting in noisy operation and premature failure. It is therefore crucial to choose a bearing with a static load capacity that is appropriate for your application’s needs.

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Dynamic load capacity is not a stand-alone load rating, but rather a parameter used in an equation to calculate the theoretical service life of a bearing system. It is typically defined as C and specified in force units of N. At Rollon, our dynamic load capacity corresponds to a nominal service life of 100 kilometers of linear travel in accordance with DIN ISO 14728-1 in the United States and Europe. In some regions, the nominal service life is based on 50 kilometers.

09.The companion flange is cleaned and inspected for scoring. Any scoring here is unacceptable because it will damage the seal and start the leak process all over again. Dress the surface with emery paper or replace the yoke as needed. Lubricate the flange with assembly grease.

At Rollon, we offer a wide range of quality bearings that can meet your linear motion requirements. Our engineering team can review your application details and help perform the dynamic load calculations so you can choose an ideal bearing that performs reliably over your target service life.

Staticload formula

For applications in corrosive environments, consider Rollon’s range of rail protection options before calculating service life. Our catalogs include look-up charts that enable you to factor in these variables when making your calculations. Moreover, if you expect your bearings to operate in a corrosive environment, consider Rollon’s many rail protection options before calculating service life

14. While you’re replacing the pinion seal, seriously consider replacing axle bearings and seals to complete this service visit.

While static load capacity is a fundamental factor when sizing, buying and specifying any linear bearing, a proper understanding of dynamic load capacity is critical to ensuring it will perform reliably over its lifetime without incurring rail damage or failure.

What is static loadingin the body

Rollon’s Linear Line of guides features a broad selection of product families like our Compact Rail, Compact Rail Plus with a double row of ball bearings, and Mono Rail profiled rail with recirculating ball bearings. When calculating the service life of our Linear Line, we use the following formula:

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05.The pinion seal is removed using a seal remover. Alternatively you can carefully pry the seal out of the housing using a common screwdriver.

Data sheets and catalog pages for rolling element linear bearings or actuators provide two load capacity specifications — static load capacity and dynamic load capacity. These ratings can have a significant impact on your choice of linear bearing. It’s important to understand the differences between these two specifications so that you can properly evaluate and select an ideal bearing for your application. Note that some actuators may list a maximum force instead of a static capacity.

In most situations, multiple forces will act on your bearing. For example, if you anticipate a load that is 50 percent of the static load and also expect to see twisting, moment or other types of load, the lifetime calculation equation will incorporate these values as part of a single effective equivalent load value — P.eq, or just P.

Dynamic load

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Staticload and dynamic load examples

Load factors are determined by taking into account all the loads that the linear bearing is expected to encounter in its application. When calculating service life, it’s essential to consider additional variables that can impact the bearing’s lifetime, such as the use of multiple bearings, environmental factors such as dirt or vibrations, and the stroke distance.

11.The flange retaining locknut gets RTV sealer, which keeps gear lube from weeping along the threads and creating a leak.

However, the standard has been updated to specify a load amount that can cause 480,000 pounds per square inch (psi) [3,310 megapascals (Mpa)] of Hertzian contact stress in the raceway. Regardless of how it is defined, be sure to check your static capacity safety factor using the following formula and guidelines:

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For many years, the basic static load capacity in a rolling element bearing was defined as the amount of load that would result in a permanent deformation of the rolling element equal to 0.0001 times its diameter.

Staticload vs dynamic load

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07.Before you seat the seal, clean the seal cavity thoroughly. Examine contact surfaces for any scoring or debris before seating this seal. Give it a gentle love tap to get the seal started, and then use a seal driver to uniformly seat the seal flush. Make sure the garter spring remains in place.

Staticload examples

Successful seal replacement boils down to sweating all the details including things we don't ordinarily notice like seal contact surfaces, seal lip condition (on a new seal), seal garter spring status, and seal perimeter condition. Scoring on seal lip contact surfaces will cause a leak. Loss of the garter spring will cause a leak. Failure to lube the seal lip and contact surfaces will cause seal damage during installation and possible leakage. Seal replacement cannot be performed with reckless abandon and hurry. You must be methodical in every aspect of your work regimen. When you are replacing a pinion seal, everything must go back together exactly as it came apart, meaning flange yoke nut torque and crush sleeve thickness. If you don't, you can wind up with unnecessary noise and most likely excessive ring and pinion gear wear that will ultimately lead to failure.

Staticload and dynamic load calculation

Few things are more annoying than seal leaks of any kind. They stain the driveway and lose all-important lubrication at the same time. Even more frustrating is replacing a seal in a differential that continues to leak. How do you replace a seal and stop the leak once and for all. And—what else do you need to know about rear axle seal replacement while you're in there? When you replace a pinion seal, you also need to think about axle shaft bearings and seals because if the pinion seal is leaking chances are good all seals probably require replacement. Our subject vehicle is a '04 Mach 1 with the 8.8-inch integral carrier rear axle, which is common to '85-'14 Mustangs and many models of Explorer, Ranger, F-series, and more. We're also seeing more restomod builds with the corporate Ford 8.8-inch housing under them as well, which makes this repair procedure quite important to Mustang owners. The Mach has a leaky pinion seal we need to replace. However, it has a lot of miles on the odometer, which means there are other items that are likely worn out as well.

02. Pinion seal replacement begins with driveshaft removal using a 12mm 12-point socket. Do you see the yellow reference marks on the yoke and driveshaft? Use those as alignment marks for reinstallation. If there are no marks, mark both the yoke and shaft with a grease pencil, touch up paint, or a scribe.

13.Reinstall the driveshaft using the alignment marks made earlier. The driveshaft yoke bolts receive fresh thread locking compound and are torqued to 70-95 ft-lb in a crisscross fashion. Top off the axle with 75/140 gear lube and a friction modifier for the Traction-Lok unit.

12.The flange is tightened with an air impact wrench and then torqued until the reference marks line up. This ensures proper pinion sleeve crush and preload.

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03. Mark the companion flange locknut and pinion as a reference. Remove the pinion companion flange retaining nut using a 11⁄16-inch socket.

Static load capacity refers to the amount of a load the bearing can support in a given non-moving instance. This specification is typically designated as the symbol C0 and is measured in units of force, such as Newtons (N).

The factory used crush sleeves on pinion gears to achieve an acceptable preload during axle assembly at Ford's Sterling Height, Michigan axle plant. Performance rebuilders generally use a solid sleeve with shims to get the desired pinion preload. When you replace a pinion seal, you want the same preload, which calls for the nut to pinion alignment marks shown earlier. We've also seen installers count the number of turns to remove the pinion nut and then reinstall the nut the same number of turns, lining up the marks on the last turn. If your 8.8 has already been rebuilt, chances are good it has the solid sleeve with shim stock. In any case, go with nut to pinion alignment marks to get pinion preload where it was prior to disassembly. Manually turn the companion flange. If it is too tight, back off and try again.

Our belief about rear axles is this: They mandate regular lube changes just like the engine and the rest of your driveline. Rear axle lube should be changed every 30,000 miles along with a transmission service. Of course those of you with 8- and 9-inch removable carrier differentials have the challenge of how to drain the lube. Your only option is to siphon the dirty lube out and replenish with fresh lube via the filler port. Those of you with integral carrier axles get to remove the axle housing gear cover.

Shorter strokes may not allow the slider’s internal components to completely recirculate. This can prevent the reapplication of the lubricant on the bearing surfaces and therefore increase the likelihood of excessive friction and premature failure.

06.This is a typical pinion seal with a garter spring around the inside lip designed to maintain a positive seal at the yoke sleeve. Seals fail when this spring pops out. Prior to installation, pack this seal lip with wheel bearing grease, which will ensure garter spring retention. Apply a very thin film of Permatex’s The Right Stuff or equivalent around the outside perimeter, which provides a leak barrier at the casting.

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