About Oil Seals: An Essential Guide for Hydraulic Pump and Motor Applications

Introduction:

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Oil seals, also known as radial shaft seals or shaft seals, are indispensable components in hydraulic pumps and motors. Their primary function is to create a barrier against fluid leakage and protect against contaminants, ensuring the efficient and reliable operation of hydraulic systems. In this blog post, we will delve deeper into the world of oil seals, exploring their design, reasons for failure, and best practices for selecting and maintaining these critical sealing elements.

Section 1: Understanding Oil Seals

Oil seals are cylindrical-shaped seals designed to fit around rotating shafts, sealing the gap between the shaft and the stationary housing. They typically consist of three essential parts:

1. Outer Case: The outer case is usually made of metal or elastomeric material and serves as the housing for the sealing element.

2. Sealing Element: The sealing element, often made of rubber or other elastomers, comes into direct contact with the shaft and forms the primary sealing interface.

3. Spring: Some oil seals feature an internal spring to maintain constant contact between the sealing lip and the shaft, ensuring an effective seal.

Section 2: Reasons for oil seal Failure

Several factors can contribute to the failure of oil seals in hydraulic pumps and motors:

1. Contamination: Exposure to abrasive particles, dust, and debris can cause wear on the sealing lip, compromising the seal's effectiveness.

2. High Temperatures: Excessive heat generated during operation can degrade the sealing material, leading to loss of sealing performance.

3. Fluid Compatibility: Using incompatible hydraulic fluids can cause the sealing material to swell, shrink, or deteriorate, resulting in leakage.

4. Shaft Runout: Shaft misalignment or excessive shaft runout can lead to uneven wear on the sealing lip, causing premature failure.

5. Improper Installation: Incorrect installation practices, such as using improper tools or not ensuring proper lubrication during installation, can damage the oil seal.

Section 3: Selecting the Right Oil Seal

When choosing oil seals for hydraulic applications, consider the following factors:

1. Operating Conditions: Assess the operating temperature, pressure, and speed to select an oil seal that can withstand the specific demands of your hydraulic system.

2. Material Compatibility: Ensure the selected sealing material is compatible with the hydraulic fluid and any potential contaminants in your system.

3. Seal Design: Choose the appropriate seal design based on your application, such as single lip, double lip, or V-ring, depending on the level of contamination and sealing requirements.

4. Quality and Brand: Opt for high-quality oil seals from reputable manufacturers to ensure reliability and longevity.

Section 4: Maintenance and Installation Best Practices

Proper installation and regular maintenance are essential for the optimal performance and longevity of oil seals:

1. Ensure Cleanliness: Prioritize cleanliness during installation to prevent the introduction of contaminants that could damage the seal.

2. Use Lubrication: Apply a compatible lubricant on the sealing lip during installation to reduce friction and prevent premature wear.

3. Regular Inspections: Include oil seal inspections in routine maintenance to identify signs of wear or damage and replace seals as needed.

Conclusion:

Oil seals are vital components that contribute to the efficiency and reliability of hydraulic pumps and motors. Understanding the factors that can lead to oil seal failure and selecting the appropriate seal for your specific application will help optimize the performance and extend the life of your hydraulic system. By following best practices for installation and maintenance, you can ensure your oil seals effectively protect against fluid leakage and contaminants, making your hydraulic equipment operate at its best for years to come.

Oil Seal Measurement & Selection: Industrial Application Guide

Ways to Measure and Choose Oil Seals for Industrial Applications

Oil seals are used in several industrial applications to protect shafts and bearings from oil, grease, contamination, and dirt. They comprise an outer and an inner circular rings. The outer ring or disk is made of metal, while the inner one is made of rubber and hence is flexible. It is stuck onto the outer ring with the help of a chemical adhesive. There are oil seals with single lip as well double lips. The sizes of these seals depend on application requirement, and hence it is measure the inner and outer diameters, width, and so on. Also, it is crucial to choose the right type of oil seal for every application. This post discusses the way to measure and choose the oil seal for your application.

How to Choose the Right Oil Seal Type?

You may have to choose or identify the oil seal type in case of either a new equipment fitment or as a replacement for the damaged one. Here are a few pointers to identify the right seal type.

• Primarily, there are single lip and double lip oil seals. The single lip is the immersed at the bottom for which the inner diameter needs to be considered.
• Double lip oil seals have an extra lip at the top which protects from external contamination, dirt, and so on.
• Pressing along the line of the inner diameter at the top may help determine whether the oil seal is single lip or double lip.
• Check the code of the lip seal given by the manufacturer or look for a reference guide for further information regarding the oil seal type. This is because there are several types of single lip as well as double lip seals with varied configurations such as type A, B, or C single lip and type BO, ADL, double lip, and so on.
• Type B seals have their outer diameter made of metal, while in case of type A it is made of rubber. In type C, there is reinforced metal added for structural stability. Likewise, there are several types of materials and their permutations and combinations.
• All of these oil seals based on their materials have specific physical and chemical properties, and accordingly find applications in diverse industries. For instance, type C single lip offers structural stability and hence finds use in heavy engineering. Type A made of rubber has amazing resistance to heat, chemicals, and so on. Hence, they find application in industries where there is exposure to chemicals, abrasion, and elevated temperatures.
• Before you choose the type of oil seal, it is essential to measure it, which is discussed in the next section.

How to Measure Oil Seals?

Oil seals are typically used as seals in moving parts that prevent friction as well as mixing of liquids or other elements. The oil seeps between the lip and shaft and that lifts up the lip. This creates the required gap between the lip and shaft as they should never come in contact with each other. This is basic working mechanism of oil seals. When replacing these oil seals, it is essential to measure them since they have different dimensions based on the application they are fitted in. Here are some pointers regarding their measurement.

• While visual inspection may offer some clue, it may not be accurate. Hence, measuring the inner and outer diameter with the help of calipers is important.
• Their measurement is much like O-rings, wherein, height, lip, type, inner and outer diameter are important factors. Material is also a factor to be considered although it cannot be measured.
• Take at least three readings, preferably with a Vernier caliper. Consider the average reading if there is negligible difference among the values.
• Measure the bearings and also consider the gaps.

If you want to buy

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If you want to buy

If you want to buy automotive oil seals or industrial oil seals these identification pointers may be useful. However, ensure you source them from reliable manufacturers and suppliers that can ensure leak proof seals. If you are looking for food or pharmaceutical applications, ensure the industrial oil seals are FDA approved. SSP Manufacturing Inc. has a market presence of more than three decades and offer premium quality custom oil seals for a number of industrial applications.

A Comprehensive Guide to Selecting High-Quality Oil Seals

A Comprehensive Guide to Selecting High-Quality Oil Seals

Shanfengyoufeng

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If you are looking for more details, kindly visit Pump Oil Seal.

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Aug 9,

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When it comes to choosing oil seals, it is essential to have a clear understanding of their role in preventing leaks and ensuring the smooth operation of machinery. With a myriad of options available in the market, selecting the right oil seal can be a daunting task. This article aims to provide you with a comprehensive guide to choosing high-quality oil seals, ensuring reliability and efficiency in your machinery.

1. Understand the Application:

Before selecting an oil seal, it is vital to have a thorough understanding of the application and the specific requirements of your machinery. Consider factors such as operating conditions, temperature, pressure, and the type of fluid being sealed. By identifying these parameters, you can narrow down your options and choose an oil seal that is best suited for your needs.

2. Quality and Material:

High-quality oil seals are manufactured using premium materials that offer durability, resistance to wear, and compatibility with various fluids. Materials commonly used for oil seals include nitrile rubber, fluoroelastomer, silicone, and polytetrafluoroethylene (PTFE). Assess the compatibility of the material with the intended environment and fluid, ensuring longevity and effective sealing performance.

3. Size and Design:

Accurate measurements are crucial when selecting an oil seal. Consider the shaft diameter, bore diameter, and width of the seal housing to ensure a proper fit. Additionally, consider the seal design, which may vary depending on the application. Common designs include radial lip seals, axial seals, and rotary seals. Understanding the specific requirements of your machinery will help determine the appropriate design for optimal sealing performance.

4. Pressure and Temperature Rating:

Different applications may require oil seals that can withstand varying levels of pressure and temperature. Ensure that the selected oil seals have suitable pressure and temperature ratings to avoid seal failure or leakage. It is recommended to consult manufacturer specifications and guidelines to ensure the oil seals can effectively operate within the desired application range.

5. Consider Environmental Factors:

Certain environments may introduce challenging conditions such as exposure to chemicals, extreme temperatures, or abrasive materials. In such cases, it is crucial to choose oil seals specifically designed to withstand these factors. Look for seals with enhanced resistance to chemicals, extreme temperatures, UV radiation, and abrasion. This will guarantee the longevity of the oil seal in challenging operating conditions.

6. Seal Performance and Reliability:

Evaluate the performance and reliability of the oil seals by considering their track record and reputation in the industry. Look for seals manufactured by reputable companies with a proven history of delivering high-quality products. Customer reviews and feedback can also provide valuable insights into the overall performance and durability of the oil seal.

7. Cost and Value:

While cost is an important factor when selecting oil seals, it should not be the sole determining factor. Consider the overall value and longevity that the oil seal provides. Investing in a slightly more expensive, high-quality oil seal can save both time and money in the long run by minimizing downtime, maintenance costs, and potential equipment damage.

Choosing good oil seals can significantly impact the performance and reliability of your machinery. By understanding the application, prioritizing quality and materials, considering size and design, assessing pressure and temperature ratings, and taking into account environmental factors, you can make an informed decision. Remember, choosing the right oil seal requires careful consideration of various factors to ensure optimal sealing performance and long-term efficiency.

Couple of questions about seals

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#1 Post by tarjla » Tue Dec 16, 9:44 am

Hi,I have found the missing washer from my water pump.When I refit the pump the large o-ring that goes on the outside of the pump do you guys fit it "dry" or do you put some sort of sealant around the seal and inside rim of the case as well.
I also want to change the water pump oil seal,the old part number is still available on ebay,is the seal different to the new part number one.I was wondering if the NOS ones may of gone a bit hard and has anyone used a yambits one that are 1/4 the price!,cheers

Re: Couple of questions about seals

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#2 Post by Speed Freak » Tue Dec 16, 3:48 pm

General rules for seals:

Paper seals:
Without sealant and dry on clean unscratched sealing surfaces.
No Oil, otherwise it can slip out of the sealing gap (best example: cylinder base gasket that gets sucked in by the negative pressure, not a RD500 problem, but a lot of other 2-stroke engines).
Tightened with the correct torque they should seal how it is planned from Yamaha.

O-Rings:
Clean sealing surfaces and some lubricant.
If it seals to oil, you can use oil as lubricant (NBR material), if it seals to coolant you should use coolant as lubricant (A small possibility that they have used EPDM material instead of NBR and EPDM is not resistant to oil)
If you put it in completely dry the O-ring will twist or in worst case doesnt`t slip into the counterpart and get cuttet.

Metal gaskets:
Same as paper

Silicone sealant:
Is just used where no other gasket is planned, only exception are 4-stroke valve cover gaskets where a spot of sealant is used at the sharp edges of the camshaft "half moons".


You can use the new Yamaha part as they just sell parts that will work properly (maybe some small dimension differences)
As fas as i have seen, Yambits is selling ARS seals - if the same numbers are on the seal then it is the completely same part.
You pay a lot of money for Yamaha bags and boxes.
Best example steering head bearing: Yamaha 60', completely same part in maufacturer box ~15'
Or 3 weeks ago a bought a part for my VW car - 130' from the VW dealer, 70' aftermarket - same part, only the VW symbol was grinded out of the part and it was in the original manufacturers box My bikes:
RD500 YPVS 1GE
RD350 YPVS 31K
Honda CBR RR SC57
Yamaha R1 RN04

Re: Couple of questions about seals

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#3 Post by silverstrom » Tue Dec 16, 5:21 pm

If you want to do the job only once, use Yamaha seals. If you have time and money to do the job more than once use Yambits seals. You get what you pay for. It all depends on the value you put on peace of mind.

Re: Couple of questions about seals

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#4 Post by adr1an » Tue Dec 16, 5:47 pm

I have used Yambits seals and gaskets on many occasions on a number of bikes and never had an issue. I prefer to use Yamaha head gaskets where available or more than happy to use Vesrah which I'm using in my 500 and have done over several years.
Alternatively, sometimes the seals are 'standard' and can be sourced from engineering bearing and seal suppliers who cannot afford to supply sub-standard products to industry. They will tell you who manufactures their supply.
Yamaha do not make seals, they source them and QA them from a number reputable companies. Yes, by all means get the Yamaha part if it is convenient and you are happy with the price, but to suggest that going elsewhere is second rate is not in my experience the case.

Re: Couple of questions about seals

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#5 Post by Speed Freak » Tue Dec 16, 8:07 pm

If you know where to search you can get the same part as from yamaha as an aftermarket part.
The seals used in the RD500 are made by ARS or Koyo, you can read it on the seal.

Usually the OEM`s take the part as it is (cheapest way). Only if they have problems with this part while testing they try to find alternatives.
If there are no alternatives the part is modified - how it happened with the RD350 crankshaft bearing (clutch side).
They had a problem with broken bearing cages - Yamaha bearings have the same number stamped in as aftermarket parts but the rivets and the cage itself are more massive than the "standard part".

But there can be small differences, as example you can order a seal in different rubber materials and also the material of the spring can be changed (depending on the fluid that should be sealed - as example for acid you can`t take a standard steel spring).
Or O-Rings can have different materials or same material but different hardness.


All in all, if you buy Yamaha parts, you get the correct part that is tested.
If you buy aftermarket parts, it can be the same but it also can be a different part with the possibility that it will not work. My bikes:
RD500 YPVS 1GE
RD350 YPVS 31K
Honda CBR RR SC57
Yamaha R1 RN04

Re: Couple of questions about seals

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#6 Post by 2smoke » Wed Dec 17, 2:09 am

Spit on the oring and push it in. Done.
Man I am sick of the yambits seal fight.
Over and over. Its a lot of risk to save very little. Colin

Re: Couple of questions about seals

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#7 Post by nzminis » Wed Dec 17, 2:24 am

I have said it may times here and on the 350 side .
all of the seals i have brought for my 500 and 3x 400 are yambits seals and are made by ARS . who makes yamaha seals i have yamaha crank seals and yambits ones here they are the same seal .
i have not used there o rings never needed to . but im sure they are just generic o rings
so you do not have a valid clam saying dont use yambits seals

i have also used Vesrah gasket sets i used everything bar the head gaskets on my bike and did not have any issues

Re: Couple of questions about seals

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#8 Post by silverstrom » Wed Dec 17, 3:08 am

Really? I don't have a right to complain about Yambits? Read on...The last set of Yambits crank seals I used in an RZ350 lasted 100 km. The right side was leaking badly and the left side broke the spring. A pressure test upon initial engine assembly was good. Only 100 km of use and both seals failed. A pressure test at that point confirmed the cases wouldn't hold any pressure and the right side seal was pissing air.I only used them because that is what the bike owner requested because he wanted to save $20. His bike, his money. Not so cheap when I had to do the job again. I have a very valid claim saying Yambits seals are shit. They are. If you want to use them and run the risk of failure just to save a few $$ then by all means do so. But don't say Yambits seals are without problems when that just isn't true. OEM seals are cheaper than another rebuild.

This is what a Yambits crank seal looks like after 100 km.

Re: Couple of questions about seals

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#9 Post by nzminis » Wed Dec 17, 5:05 am

did that crank seal read ARS ? im guessing not it must have been way back when they first started because there was a few aftermarket seals they were using

because the whole lot i got recently for my 500 and 400 were all ARS seals
dont know how you can say only use oem seals . when i have seen it with my own eyes and proven it with many many s of kms on 4 diffrent bikes that yambits seals Are oem

look at the below link you can even read Ars . now you cant tell me that the genuine seal is not identical

http://yambits.co.uk/rz500-crank-oil-seal-p-.html" onclick="window.open(this.href);return false;

Re: Couple of questions about seals

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#10 Post by silverstrom » Wed Dec 17, 9:49 am

It was last summer.

Just because it says ARS, doesn't mean it is ARS. The Chinese copy everything, right down to the manufacturers name. Chinese Brembo calipers are a good example.

Look, all I'm saying is be aware of what you are buying and don't assume that Yambits is all about quality. I've bought enough from them to know that much of it is offshore crap. There are places to save money, but seals isn't one of them. When I pay more for OEM seals I know that I'm getting seals that will perform as expected. If you buy from a supplier that provides aftermarket seals, expect aftermarket seals, regardless of what they say or how the part looks. Looking the same does not make them the same. Yamaha has a reputation to protect. Yambits, well, not so much.

That's the end of my rant. It's your money so buy whatever you want. My money will buy quality, regardless of the cost.

Re: Couple of questions about seals

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#11 Post by Speed Freak » Wed Dec 17, 12:54 pm

Why should the chinese copy a specific mass production seal?
I think Yambits buys this seals directly from ARS (Arai Seisakusho, same company makes the Arai helmets) - same as Yamaha.

Is the RD350 seal shown on the picture a ARS seal?
If yes, are there the same numbers on the seal as on the original seal?
Does it have 2 PTFE sealing lips or just rubber sealing lips?

It looks a little bit like a just rubber type that will not work in this place.
This seals need a thin fluid layer to work (oil) and at least on the generator side the outer lip will not get any lubricant.
I think everyone can imagine what happens if rubber slides directly on a clean metal surface...
Therefor the original seal has PTFE sealing lips - no need for lubricant My bikes:
RD500 YPVS 1GE
RD350 YPVS 31K
Honda CBR RR SC57
Yamaha R1 RN04

Re: Couple of questions about seals

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#12 Post by 2smoke » Wed Dec 17, 1:07 pm

Oh my god, these crankshaft seals are not mass production seals!
They are made for Yamaha to their specs to fit this engine only.
Yes they can be copyed by other manufacturers.
Not sure who is making them for Yambits and don't care. Colin

Re: Couple of questions about seals

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#13 Post by ns86 » Wed Dec 17, 1:40 pm

I have a set of Gus's crank's for one of my engines and just had a look at the set of seals I got with the cranks. Says SFK not SKF! They appear to be good quality made in Taiwan with 2 red sealing lips. I haven't heard anything bad but has anyone had issues with Gus's seals? In the case of my NS400 I have no choice but to trust Classic Race Replicas choice of aftermarket crank seals and Ian's reputation rather than deciding myself what to go with. I would go OEM if I could for my NS400 so I will go OEM on my RZ500 engine since I can. I have made a habit of buying whatever OEM cranks seals I can for my NSR250's as well and have quite a few. I agree with John. If you can get them, go OEM! RZ500
RG500
RG500 C
RGV500 WW ATR
RGV500 LS
NS500 Spencer p
TZR500 Biaggi p
RZV500 Rainey p
NSR250sp R
NS250 p
RG250 WW p
RG250 p
YSR50 p

Re: Couple of questions about seals

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#14 Post by solo 2 » Wed Dec 17, 9:34 pm

The company is the world’s best 5/16 of a Cup supplier. We are your one-stop shop for all needs. Our staff are highly-specialized and will help you find the product you need.

I'm not sure how to answer this as I've had no problems with Yambits seals on 3 builds now including my 500 with no issues, the only seals I've had a problem with are OEM Yamaha fork seals...so I guess Yamaha seals are proven junk.

I've heard this argument (usually over shrilly) on many forums, I've owned more than a few vehicles that I could afford to buy but not fix or at least was not willing to pay the exorbitant prices, BMW, Porsche, Ducati etc. and the forums always have those people who swear that if you use anything other than factory parts your vehicle will disintegrate, blow up, have a hissy fit etc. So I must be one lucky SOB because I've had more luck with after market parts than with most of the OEM stuff I've purchased.

I purchase from Yambits because they supply good parts at a decent price and I can one stop shop, which is important to me. I will also say that I have the mechanical ability to do stuff myself if anything should go wrong.