How Reinforced Dust-Proof COMBI Seals Stop Contamination Ingress in Off-Highway Machinery

Customer problem: Off-highway drivetrains draw airborne dirt into the sealing zone during rotation, vibration and pressure changes.

Practical solution: The combined dust and oil sealing system creates multiple barriers for axles, hubs and gearboxes exposed to severe debris.

Problem-Solving Benefits

• Creates staged barriers against airborne dirt

• Supports stable sealing under vibration

• Protects off-highway lubricant cleanliness

Recommended application: off-highway axles, hubs, final drives and gearboxes.

50 Product Attributes

1. Product type: reinforced COMBI rotary shaft seal

2. Primary function: external dust exclusion

3. Secondary function: oil or grease retention

4. Seal structure: integrated combination seal

5. Lip design: dedicated dust lip plus oil lip

6. Barrier mode: contact and labyrinth-style stages

7. Contaminants: dust, grit, sand, mud and residue

8. Motion: rotary shaft

9. Rotation: bidirectional or reversing

10. Duty: heavy and continuous service

11. Case: rigid metal reinforcement

12. Case benefit: stable roundness and lip alignment

13. Mounting: housing press fit

14. OD style: rubber-covered or metal-cased

15. Elastomers: NBR, HNBR or FKM options

16. Metal: carbon or corrosion-resistant steel

17. Spring: optional garter spring

18. Spring metal: carbon or stainless steel

19. Hardness: application-selectable

20. Temperature: compound-dependent

21. Speed: shaft-diameter and rpm dependent

22. Pressure: non-pressurized or low-pressure duty

23. Shaft size: custom metric or inch

24. Housing bore: custom to drawing or sample

25. Width: customizable

26. Tolerance: controlled interference fit

27. Shaft finish: fine and lead-free recommended

28. Shaft condition: burr- and groove-free

29. Runout: within equipment limits

30. Eccentricity: minimized

31. Lip lubrication: compatible oil or grease

32. Abrasion resistance: dusty-duty compound option

33. Corrosion resistance: material-selectable

34. Water exposure: splash and wet-mud resistant

35. Vibration: reinforced fit

36. Impact protection: shielded lip layout

37. Orientation: dust lip faces contamination

38. Tooling: flat full-case driver

39. Installation depth: square and controlled

40. Maintenance: inspect debris and lubricant

41. Service interval: environment-dependent

42. Failures reduced: lip wear, shaft scoring and dirty bearings

43. Customization: size, compound, case, spring and lips

44. Branding: OEM and private label

45. Inspection: dimensions, appearance and lip integrity

46. Supply: prototypes, replacement and production volume

47. Locations: axles, hubs, gearboxes and final drives

48. Industries: agriculture, construction and off-highway

49. Benefit: longer component life and fewer shutdowns

50. Specification: final details confirmed by drawing or sample

Selection and Installation

Confirm shaft size, housing bore, width, rpm, temperature, lubricant and contamination level before ordering. Install squarely with a clean full-case driver, lubricate the lips and protect them from splines, threads and sharp edges.

Performance note: Correct selection and installation help keep lubricant cleaner, reduce abrasive wear and prevent contamination-driven bearing failure. Final service life depends on shaft condition, alignment, duty cycle and environment.