Snow Blower Seal Problem:

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Clark Seals was approached by a leading manufacturer of snow blowers to address a persistent seal leakage issue. After conducting a thorough review of their equipment and an in-depth analysis of the application, it was determined that the leakage was caused by a common issue found in seasonal equipment. Mowers, agricultural machinery, watercraft, and motorized vehicles all experience periods of heavy use followed by extended storage, which can cause rubber compounds to compress and relax, resulting in dimensional changes and reduced compression properties. This issue is further exacerbated in seasonal equipment, where shaft and housing misalignment, as well as run-out, are frequent challenges.

The solution, typical for seasonal equipment, was to design a seal with enhanced followability to resist compression set and stress relaxation at low temperatures. This included improving the reaction ratio and increasing the lip force contribution from the garter spring, as stainless steel springs are not prone to stress relaxation.

This custom seal solution was developed in just one week, was more cost-effective than the original seal, and ultimately led to a 94% reduction in warranty claims.

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Case Study

Seal Specifications

Product NameSnow Blower Seal
Product DescriptionShaft Seal used in snow blower motor to prevent leakage caused from rubber stress relaxation of seasonal equipment
Capabilities Applied/ProcessesProblem Seal AnalysisPrecision ManufacturingCustom AutoCAD Seal Design
Overall Dimensions of the SealÖ1.580x 0.197 ( OD x H )
Tightest Tolerances MetRMA standards, .001"
Material UsedELASTOMER: VITONSPRING: Stainless steelMETAL CASE: carbon steel
BenefitsResists Compression Set and Stress Relaxation @ LowRemains More Flexible During Long Periods of IdlenessElastomer with low friction coefficient ingredients.
In process testing performedCustomer Life-Test
Estimated Part Weight0.022lbs
Standards MetElastomer spec.: SAE J200 M4HK 814Metal case material spec.: SAE 1008Spring material spec.: SAE 30304
Industry for UseOutdoor Power Equipment
Delivery LocationKohler,Wisconsin

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