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CFKS Axle Combined Seal 45*65*18.5 Agricultural Steel Case Combi Oil Seal

The CFKS 45*65*18.5 Steel Case Combi Oil Seal is an extreme-duty rotary boundary component engineered specifically for the brutal operating conditions of agricultural tractors, combine harvesters, and heavy off-highway axles. By uniting a primary hydrodynamic oil lip and a massive secondary dirt-deflection labyrinth within an exposed, high-tensile steel case, this combined seal provides absolute isolation for expensive drivetrain bearings against deep mud, submerged field conditions, and abrasive crop wrap.

  • Exposed Steel Outer Case: The rigid metal casing guarantees maximum radial interference, completely preventing the seal from backing out or spinning within the cast-iron housing under severe torsional vibration and shock loads.

  • Deep 18.5mm Combi-Architecture: Replaces vulnerable multi-seal setups by integrating high-pressure fluid retention and heavy-duty environmental exclusion into a single, highly stable 18.5mm unit.

  • Agricultural Labyrinth Defense: The robust outer excluder system acts as a physical plow, drastically extending the Mean Time Between Failures (MTBF) of axle and wheel hub bearings in highly abrasive agricultural environments.

Find your sealing solution with CFKS — contact us for a quote.

Brand Name CFKS OEM  Accpetable
Material NBR FKM Silicone  Features  wear resistance
Dimensions Customized Certificate  ISO9001/TS16949
Type Combi Seal  Packing 1 pc per bag

 

The core of this sealing system is housed within its substantial 18.5mm depth. The inner primary lip is spring-energized to strictly retain differential fluid or high-temperature bearing grease, even when the axle shaft experiences lateral deflection. Ahead of this, a heavy-duty, reinforced excluder lip rests directly against the 45mm shaft. This outer lip acts as a physical barricade, aggressively plowing away packed mud, wet clay, and abrasive slurry. Any microscopic debris that manages to bypass this initial plow is trapped within an intermediate grease-filled cavity, forming an impenetrable labyrinth seal that permanently isolates the delicate tapered roller bearings from catastrophic contamination.

 

The dynamic internal sealing elements are injection-molded from a specialized, high-density Nitrile Butadiene Rubber (NBR) matrix. This precise formulation is explicitly engineered to handle continuous exposure to API GL-4/GL-5 Extreme Pressure (EP) gear oils, Universal Tractor Transmission Oils (UTTO), and wet-brake fluids at operating temperatures up to 100°C. The cross-linked NBR matrix actively resists the physical tearing, chunking, and dry-rot that plague lesser seals in demanding outdoor environments.

Furthermore, because the outer case is bare steel, technicians must apply a thin layer of non-hardening, anaerobic flange sealant (such as Loctite or Permatex) to the 65mm outer diameter before pressing the seal perfectly square into the housing using a dedicated installation mandrel. This fills any microscopic machining scratches in the axle trumpet, eliminating the risk of slow capillary gear oil weeping. Finally, ensure the 45mm shaft is polished to a surface finish of 0.2 to 0.4 μm Ra. If heavily grooved, a stainless steel speed sleeve must be installed to restore a factory-smooth tracking surface.

Frequently Asked Questions (FAQ)

Why does my CFKS oil seal fail prematurely? Common causes and prevention tips2025-06-26T15:44:39+08:00

Premature oil seal failure can result from improper installation, poor shaft finish, incorrect material selection, or excessive pressure. To prevent this, ensure the shaft surface is smooth and within tolerance, use correct tools during installation, and choose seals made from materials compatible with your media and temperature.

How to correctly install a CFKS industrial oil seal to avoid leakage2025-06-26T16:04:32+08:00

Always clean the shaft and bore before installation. Use appropriate seal drivers to avoid deformation. Lubricate the lip before fitting to reduce friction during the first rotation. Ensure the seal is seated evenly and not tilted to avoid leaks.

What to do when your CFKS hydraulic seal is leaking under pressure2025-05-20T16:33:14+08:00

Check if the pressure exceeds the seal’s rated limit. Examine for wear, hardening, or improper installation. Replace the seal if damaged, and consider upgrading to a high-pressure CFKS seal variant. Also, verify that the housing and shaft are properly aligned.

How to choose the right CFKS oil seal for extreme operating environments2025-05-20T16:34:39+08:00

For high temperatures, aggressive chemicals, or abrasive environments, choose CFKS seals made of FKM, PTFE, or high-performance elastomers. Consider using seals with protective dust lips or metal casing. Our team can recommend the best fit for your application.

CFKS Seal Manufacturing Co., Ltd.
https://cfksseals.com/
Email: cfksnacy@gmail.com  Mobile/WhatsApp/Wechat: (86) 188-3097-5917
COMBI Oil Seal Size List
SIZETYPECORTECO / NOK CODE
30*42* 14COMBI12001878B
30*44* 11COMBI12001879B
30*44*14COMBI12013519B
30*44* 17COMBI12020067B
32*50*10COMBI
32*50*14COMBI12013914B
35*50*10COMBI12001881B
35*50*13COMBI12013947B
35*52* 10COMBI12011716B
35*52* 16COMBI12001882B
35*52* 16COMBI12013466B
35*52* 16COMBI12015717B
35*52* 17/ 18.5COMBI12019673B
35*60*18.5COMBI12014167B
35*62* 12COMBI12012786B
35*72* 12COMBI12001883B
37*52* 16COMBI12014511B
40*55*10COMBI12001886B
40*55*15.5COMBI12018848B
40*58*10COMBI12001887B
40*60*18.5COMBI12012107B
40*60*25COMBI12016289B
40*62* 10COMBI12011715B
40*62* 14COMBI12001889B
40*65*18.5COMBI12013226B
40*65*27.5COMBI12020191B
40*68*14COMBI12013319B
40*68*18.5COMBI12013464B
42*62*14COMBI12001889B
42*62* 17COMBI12001890B
42*62*21.5COMBI12016507B
42*62*23COMBI12020023B
45*60*16COMBI12014997B
45*62* 11COMBI12012296B
45*62* 11.2COMBI12016814B
45*65*12COMBI12011969B
45*65*15COMBI12001894B
45*65*16COMBI12019329B
45*65*18.5COMBI12012377B
45*65*21COMBI12013466B
45*65*25COMBI12018030B
45*75*27.5COMBI12020036B
46*60*16COMBI12014997B
46*65*16COMBI12019329B
46*65*21COMBI12013466B
46.15*80*16.5COMBI12016669B
47*65*16.5COMBI12015734B
47*65*19COMBI12020133B
48*65*11COMBI12011991B
48*65*16.5COMBI12077310B
48*65*18.5COMBI12017310B
48*65*19COMBI12036965B
48*74* 13COMBI12001898B
48*74* 18.5COMBI12017349B
50*65*18COMBI12018616B

 

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