Source of error

Possible error

Consequences for the sealing function

Cause of the vulnerability

Shutdown measure

Storage

Non-compliance with the storage conditions according to DIN 7716

Installation of faulty seal

Shortened service life

Non-compliance with storage conditions

Always comply with storage conditions in accordance with DIN 7716

Damage to the seal

Installation of damaged seal

Shortened service life

Premature ageing due to improper storage

Only open the original packaging at the installation site, e.g. oil paper or protective film

Interim storage at the assembly site

Contamination of seal

Installation of a dirty seal

No influence until immediate leakage as well as shortened service life due to increased wear

Dust, dirt from the environment

Clean the seal with a suitable cleaning agent before installation (DIN 7716)

Open bearing pre-lubricated seal

Contamination of the grease

No influence until immediate leakage as well as shortened service life due to increased wear

Dust, dirt from the environment

Always cover the packaging unit, protect it from dust and dirt, only remove the required consumption quantity

Unsuitable storage container

Contamination Damage to the seal

No influence until immediate leakage as well as shortened service life due to increased wear

Accumulation of dirt, sharp corners

Containers without sharp edges that are easy to keep clean

Preparing the seal for installation

Improper removal from packaging

Damage to the outer diameter or sealing lip

Immediate leakage to shortened service life

Sharp-edged or unsuitable tools for opening

Use suitable tools

Greasing the seal with contaminated oil or grease

Contamination of the seal

Immediate leakage to shortened service life

Dirt, dust

Protect the grease container from soiling and close it when not in use

Unsuitable oil for wetting the shaft or the seal

Chemical influence on the mixture

Shortened service life

Unfavorable lubrication

Discuss oil type with customer advisor

Too much grease between 2 sealing lips

Grease leakage during installation or operation

Max. Amount of fat: approx. 60% of the gap

No or too little fat

Insufficient lubrication Increased rubber abrasion

Shortened service life,

Incorrect instructions or incorrect dosing quantity

Use the correct amount of fat or dosage

Assembly

Incorrect design of the seal

Damage to the seal

Immediate leakage

Coordination with customer advisor

Bottle Design of the mounting mandrel

Damage to the seal

No influence until immediate leakage as well as shortened service life

Coordination with customer advisor

Press-in force too high when mounting to stop

Damage to the seal (bending of the support body)

Immediate leakage

Press-in force too high

Reduce press-in force/use lubricant

Hammer assembly

Damage to the seal

Immediate leakage

Improper assembly

Hammer mounting should not be used

Mounting location unclean e.g. metal shavings/cigarette ash

Seal dirty or damaged

Immediate failures to shortened service life

Dirt, sharp edge, metal chips

Keep the installation site clean and damage-free

Shaft

Scratched shaft

Damage to the sealing lip when inserting the shaft

Immediate failures to shortened service life

Transport damage/missing shaft protection/improper handling of the shaft

Clean the shaft before installation/use suitable protective covers and transport containers

Dirty shaft

Damage and contamination of the sealing lip when inserting the shaft

Immediate failures to shortened service life

No shaft protection/ unsuitable transport containers/ unclean handling

Clean the shaft before installation/use suitable protective covers and transport containers

Corroded shaft

Damage and contamination of the sealing lip when inserting the shaft

Immediate failures to shortened service life

No or insufficient corrosion protection/ too high humidity/ too long storage

Check shafts for corrosion before installation/ do not use corroded shafts under any circumstances/ rework corroded shafts

Corrosion inhibitor

Chemical reaction with the Simmering material or the oil to be sealed

Immediate failures to shortened service life

Unsuitable corrosion inhibitors

Consult with customer advisor/test corrosion protection agent

Concealed mounting

Blow off the seal

Insufficient guidance of the shaft

Coordinate the design with the installation and the installation space

Housing bore

Cast housing

Casting sand / blowholes / pores

Static leakage

Casting quality not sufficient

Housing bore

Shearing off rubber

Static leakage

Chamfer too large

Select bevel: 15°