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Shaft Bushing 111.6×120×120 mm – SICOMA MAO 3000/2000 – MOB08

The Bushing MOB08 is a precision-machined intermediate bushing, which is one the vital Sicoma mixer spare parts in the maintenance of inventories for high-volume concrete production. Functioning as a sacrificial shield, the MOB08 is a thin-walled steel liner designed to establish a renewable friction surface on the main shaft of SICOMA MAO twin-shaft mixers.

 

By fitting precisely over the main shaft, it provides the smooth, hardened ground necessary for the operation of dynamic sealing elements (lip seals) used in batching plant mixers. Its primary engineering goal is to isolate seal friction wear away from the expensive main shaft, protecting the crucial interface where the mixer body meets the rotating assembly.

 

Technical snapshot:

 

  • Part code: MOB08
  • Application: SICOMA MAO 3000/2000
  • Inner Diameter (ID): 111.6 mm (Precise fit for mounting)
  • Outer Diameter (OD): 120 mm (Running surface for seals)
  • Height (H): 120 mm
  • Wall Thickness (t): 4.2 mm
  • Material: Steel with a heat-treated surface
  • Weight: 1.1 kg

 

Abbreviations:

 

  • ID / OD: Inner Diameter / Outer Diameter
  • t: Wall Thickness

 

Why replacement matters?:

 

The bushing serves as the "running track" for your oil seals. If the surface falls out of tolerance, becomes scratched, or wears down:

 

  • Seal lip contact is effectively severed.
  • Grease or oil leaks toward the concrete side.
  • Cement slurry migrates into the bearing area.
  • The ultimate consequence is premature failure of the seals and bearings, followed by irreversible corrosion damage on the main shaft surface.

 

What to check before ordering:

 

The MOB08 functions as the critical interface within the sealing assembly of SICOMA MAO twin-shaft mixers.

 

  • Compatibility: These exact dimensions (111.6x120x120 mm) match models or upgrades that have bigger shaft diameters, like the MAO 3000/2000.
  • Recommendation: To identify the right part, measure the current bush dimensions (the ID and OD) using a caliper and compare them with the details in your OEM catalogue.

 

Installation notes:

 

This component combines a light interference fit with a delicate, thin-walled structure. Installing this sleeve is not an isolated task; it requires correct interaction with the following auxiliary parts for system integrity:

 

  • Main Shaft: The substrate the sleeve sits on. It must be completely cleared of rust and burrs.
  • Oil Seals: Compatible with seals like PA084 or PA102 . These seals run directly on the sleeve's outer surface. Lubricate the sleeve surface with clean grease during assembly to prevent cutting the seal lips on sharp edges.
  • Locking Unit (MOSACOM): The mechanism that axially retains the sleeve and drives its rotation. The sleeve must be positioned to fully engage with the locking unit.
  • Yellow Wiper (0529G0006B1): Protects the outermost part of the sleeve. Ensure the sleeve passes concentrically through this ring during assembly.
  • For critical applications, installation should be carried out by a qualified maintenance technician.
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