Often referred to its DuPont trade name Teflon, PTFE is a polymer with very unique properties. Due to its chemical composition and physiologically neutral properties, it is a plastic material with a very broad range of chemical resistance and very low coefficient of friction; however it has some restrictions in terms of mechanical properties and wear characteristics. Therefore PTFE is often modified by adding various fillers to improve specific properties such as wear or extrusion resistance. One important characteristic of PTFE is the low friction coefficient giving outstanding stick-slip performance. Therefore PTFE is the preferred material in applications requiring accurate positioning of hydraulic cylinders. Due to increased modulus of elasticity compared to rubbers and polyurethanes, PTFE seals cannot usually be installed by simple snap-in measures therefore require special tools and procedures for installation.

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The most commonly used media in hydraulic systems are mineral oil based fluids with various additives. However, a variety of alternative fluids may be encountered in special applications. For example, biodegradable fluids such as synthetic (HEES) or natural esters (HETG) and polyalphaolefines (POA) may be used to reduce environmental impact in the event of accidental spills. Flame retardant fluids based on water or synthetic esters may be safely used in confined spaces or where hydraulic systems are used in close proximity to ignition sources.

A: While possible, replacing a wheel bearing requires specific tools and expertise. It’s recommended to seek professional help for accurate installation.

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The chemical composition on hydraulic fluids can impact the seal life and system performance depending on fluid compatibility with the seal material. Absorption and reaction of seal materials with non-compatible fluids can cause for example:

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The type of cylinder and the application in which it’s used are two of the main criteria to determine which seals and guides are selected. Applications are referred to as light duty, medium duty and heavy duty. These classifications are somewhat subjective but the duty levels are typically characterised by the following criteria.

Car Feels Loose. Does your car feel loose? When you hear professional drivers talk about a “loose” car, you may not know what that means. It often refers to the steering of the vehicle, which can include wheel bearings. Wheel looseness, or also called wheel play, is another common symptom of a bad wheel bearing. As the bearing begins to wear down, they become loose inside the wheel hub and spindle, which makes your vehicle feel loose while steering.

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Generally these changes are accelerated by higher temperatures. To avoid these changes and the resulting damage to seal function and life, careful consideration should be taken to ensure compatibility between fluid and all seal materials, as well as the temperature and mechanical loads on the seal material.

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A: Common causes include poor maintenance, water and dirt contamination, extreme driving conditions, and manufacturing defects.

Fluid power systems transfer and utilise mechanical power through a working fluid. Energy is transmitted, stored and used through the transfer and pressure of fluids. By utilising differential surface areas acted upon by the pressure of the working fluid, a mechanical advantage can be achieved. There are two main types of fluid power systems:

Rubbers are widely used in the sealing industry for rotary shaft seals, static sealing elements such as o’rings and energisers as well as dynamic seals in the fluid power industry. Depending on the chemical composition, rubbers can cover a wide temperature range up to 200°C (390°F) and more and can withstand a wide variety of hydraulic fluids. NBR elastomer in a hardness range of 70 to 90 Shore A Durometer are the most commonly used rubbers in the fluid industry. For higher temperatures and more aggressive hydraulic fluids, HNBR and FKM material is often used.

Polyurethanes combine the elastic properties of elastomers with melt processible thermoplastic materials. Seals made of polyurethanes provide excellent wear and anti-extrusion characteristics. Special sealing polyurethanes grades have a superior compression set and relaxation performance as well as temperature stability compared to commodity industrial grades. Due to their elasticity and flexibility, they are easy to install.

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Tire Wear and Tear. What about your tires? We all know the importance of rotating your tires to promote even wear, but did you know a broken wheel bearing can lead to uneven tire wear too? The looseness of the wheel and the vibration that reverberates through the wheel cause your tires to wear unevenly, meaning you are more likely to have to invest in new tires sooner.

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A hydraulic cylinder is a linear actuator used to push or pull a load, or to selectively resist motion under load by means of fluid pressure. Double-acting cylinders, the most common type, are able to push and pull (see Fig.1). High pressure fluid is pumped into the extend chamber port (Fig.1: A) and acts on the piston to push the piston rod out, thereby extending the length of the cylinder. Inversely, to retract the piston rod and reduce the length of the assembly, high pressure fluid is pumped into the retract chamber port (Fig.1: B) and acts on the opposite side of the piston.

To support sealing function and keep the contact force for long seal life, many different properties should be considered to provide effective seal performance, examples include:

A: Typically, wheel bearings last between 85,000 to 100,000 miles, but this can vary based on driving conditions and maintenance.

When wheel bearings wear out, they can have a significant impact on vehicle performance, leading to increased friction and resistance within the wheel assembly. This extra friction forces the engine to work harder to maintain the same speed, resulting in decreased fuel efficiency. Additionally, worn bearings can cause uneven tire wear, as the compromised alignment and stability of the wheels lead to irregular contact with the road surface. Hitting a pothole or other road hazard can exacerbate bearing damage, potentially causing sudden bearing failure and loss of vehicle control. The deterioration of wheel bearings also affects the proper transfer of torque from the engine to the wheels, further compromising handling and increasing braking distance.

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Rigid Thermoplastics, thermosets and their composites are characterised by much higher hardness and stiffness as well as reduced elasticity compared to polyurethanes, rubbers and PTFE. Therefore they’re used for components where mechanical strength is more important than flexibility, such as guide rings, anti-extrusion rings and special seal arrangements for heavy duty applications. Rigid thermoplastics and composites.

We want to take the stress out of getting your vehicle serviced. We’ll never talk down to you or pressure you, but we will be completely thorough honest about what your car does need - specifically noting anything that could be a safety issue.

Vehicle Pulling to One Side While Driving. Are you doing the steering, or is the car driving where it wants to? When a wheel bearing corrodes or becomes pitted, the smooth exterior lining is gone and the vibration is transmitted to the tires which may feel like it is “pulling” to one side or the other. As the bearing on one side deteriorates, it puts more pressure on the opposite bearing, leading to uneven wear and increased friction. This uneven wear generates heat, which further accelerates the degradation of the bearing. As a result, the affected wheel may start to wobble or vibrate, robbing the vehicle of its stability and smooth handling, especially when cornering or driving at higher speeds.

Materials play a major role in the performance and lifetime of seals. Generally, hydraulic seals are exposed to a variety of application and working conditions such as a wide temperature range, contact with various hydraulic fluids and the outside environment as well as high pressure and contact forces. The appropriate seal materials have to be selected to achieve a reasonable service life and service intervals. A wide variety of seal materials from four major polymeric material groups is available:

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Heavy duty cylinders are typically used in off-highway earthmoving, mining and forestry equipment and may be characterised by:

In addition to these considerations, the structure and morphology (the study of form and shape) of polymeric materials make selection and specification of seal materials much more complicated than the standard materials used in mechanical engineering (such as aluminium and steel). Mechanical properties of polymeric materials are strongly influenced by time, temperature, load and rate of motion. Highly complex intermolecular processes affect the stress relaxation and retardation phenomena. Furthermore, the tribology of the system (e.g. friction and wear) has a strong influence on the seal material properties and vice versa.

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Unusual Noises Coming From the Wheels. Listen carefully. The most common and often most-identifiable symptom associated with a bad wheel bearing is noise coming from the wheel or tire area of the moving vehicle. You may mistake this as engine noise, but when you listen closely you will likely hear grinding or grating that gets louder as the vehicle accelerates. Since wheel bearings are not known for wearing out too frequently, the noise is typically suspected to be something else and the problem gets overlooked.

A cylinder which can only push but not pull is referred to as a single-acting cylinder. High pressure fluid is pumped into the extend chamber (Fig.2: A) and acts on the piston to push the piston rod out. An external force is required to return the cylinder to the retracted position. A typical single-acting cylinder can be found on a forklift truck where the load of the fork assembly (tines and carriage) enacted by gravity pushes the cylinder back into the retracted position. Multi-stage cylinders (also referred to as telescopic cylinders) have two or more piston rods in a coaxial arrangement to achieve a greater extended length compared to the retracted length.

Wheel bearings are essential in the operation of your vehicle. More precisely, a wheel bearing is crucial for the proper function of the hub, tire, and wheel assemblies to work together. The wheel bearing allows friction-free movement and rotation of the hub assembly, and thereby provides smooth tire and wheel rotation. Worn-out or damaged wheel bearings can lead to a range of problems that affect vehicle performance and safety, making it essential for drivers to recognize the signs of trouble.

Hydraulic cylinder seals are used to seal the opening (clearance gap) between various components in the hydraulic cylinder. Fig.3 shows an example of the seal and guide components of a heavy duty cylinder.

Light duty cylinders are typically cylinders used for stationary equipment, indoors in a factory environment and may be characterised by:

Hydraulic seal

If you suspect you are driving with a broken — or nearly broken — wheel bearing, stop in and see us today. Our team of trained technicians will quickly assess and repair your vehicle and have you back on the road in no time!

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The fluids used in hydraulic systems come in various chemical compositions and viscosity grades as suited to specific applications.

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Chances are when you start hearing a loud noise from under the hood of your car as you’re driving, you automatically think it’s an exhaust leak or your car is going to break at any moment. But have you thought about the possibility of a broken — or nearly broken — wheel bearing causing that noise?

Viscosity is a measurement of the thickness of the fluid or resistance to flow. Seal performance is affected by the viscosity of the fluid and changes to viscosity during use. Most typical hydraulic fluids exhibit decreased viscosity with increasing temperature and increased viscosity with increasing pressure.

You can rely on our promise of honesty and competence when we service your vehicle. Our customers know that they will get a fair price for services provided.

When you bring your family’s car to Wiygul Automotive Clinic, we take your trust in us seriously. We take the time to get to know you and your vehicle. In addition, we will send you service reminders and maintain service records that help keep your car’s factory warranty valid - which means you don’t have to go to the dealer for service.

2009113 — 1 quick question. is an axle bearing the same as a wheel bearing? If so i have a loud vibration from my rear end. I have.

Hydraulic fluid compatibility Thermoplastic ElastomersRubbersThermosets MaterialPolyurethanePolyurethaneHydrolysis Resistant PolyurethaneHydrolysis Resistant PolyurethaneEther-Based TPUEther-Based TPUPolyesterPolyesterNBR/HNBRNBR/HNBRFKMFKMEPDMPA/PFPMPEEKPTFE TemperatureNormalHighNormalHighNormalHighNormalHighNormalHighNormalHighAllAllAllAllAll Hydraulic FluidsUp to 60°CUp to 100°CUp to 60°CUp to 100°CUp to 60°CUp to 100°CUp to 60°CUp to 100°CUp to 60°CUp to 100°CUp to 60°CUp to 100°C Mineral Oils HL, HLP, HVLPABAAAB/CAA/BAAAADAAAA ATF: Automatic transmission fluidABAAAB/CABAAAADAAAA HETG (triglycerides, rape seed oil)AB/CAAACAB/CA/BA/BAADAAAA HEES (synthetic esters)AB/CAAACAB/CA/BA/BAADAAAA HEPG (polyalkylene glycols)BDACB/CDCDAA/BA/BC/DAAAAA HEPR (polyalphaolefins)ABAAAB/CABA/BA/BAADAAAA Fire Resistant Fluids, Water BasedUp to 40°CUp to 60°CUp to 40°CUp to 60°CUp to 40°CUp to 60°CUp to 40°CUp to 60°CUp to 40°CUp to 60°CUp to 40°CUp to 60°C WaterBDAAABABAAAAACAAA HFA Fluids (oil in water)BDAABB/CABAAABDCAAA HFB Fluids (water in oil)BDAABDABAAAADCAAA HFC Fluids (water – glycol)CDAB/CBB/CCDAAA/BB/CACAAA Fire Resistant Fluids, Water FreeUp to 60°CUp to 100°CUp to 60°CUp to 100°CUp to 60°CUp to 100°CUp to 60°CUp to 100°CUp to 60°CUp to 100°CUp to 60°CUp to 100°C HFD-R FluidsDDDDDDDDDDCCAAAAA HFD-U Fluids (polyol amd carboxylic esters)BDAABDAB/CCCAADAAAA Mineral GreasesABAAABAAAAAADAAAA

A: Driving with a bad wheel bearing is dangerous as it can lead to wheel failure and accidents. It should be addressed immediately.