Front Seal Cover (Flanged) – SICOMA MAO 3000/2000 – MOCA4

This sturdy flanged cover forms the main structural part at the front of the shaft bearing setup in SICOMA MAO 3000/2000 Twin Shaft Concrete Mixers.

It acts as a strong shield against the pressure from the concrete inside the mixer tank. The MOCA4 plays a crucial role in preserving the seal's strength during intense concrete production processes since it holds the entire sealing stack in place, which includes the yellow wiper blue seal, and oil seals, against the bearing housing.

By maintaining steady pressure, it keeps operations leak-free and stops concrete slurry from getting in even in tough batching plant conditions.

Technical snapshot:

• Part code: MOCA4
• Application: Front Face of Sealing Group of SICOMA MAO 3000/2000 (
• Material: GGG50 Ductile Iron
• Dimensions: Inner Diameter (ID) 125 mm | Outer Diameter (OD) 230 mm | Height 35 mm.
• Weight: ~3.5 kg
• Connection: 6 x M14 bolt holes (PCD) and a threaded port for the greaser.
• Feature: Precision-machined grooves

Abbreviations:

• ID / OD: Inner Diameter / Outer Diameter
• PCD: Pitch Circle Diameter

Why replacement matters?:

The following is may occur if the cover completes it's life cycle of use:

• Loss of Preload: A crack or warping in this cover causes the sealing group to lose its clamping force immediately.
• Barrier Failure: Without axial pressure, O-rings fail, allowing grease to escape and abrasive slurry to invade.
• Consequence: This leads to rapid contamination and catastrophic failure of the main bearing, halting the concrete mixer.

What to check before ordering:

As a critical OEM component in our Sicoma Twin Shaft Concrete Mixer Spare parts inventory, correct identification is vital.

• Compatibility: Compatible with larger MAO series mixers (specifically MAO 3000/2000). It works alongside components like MOSAP8.
• Variation Alert: Design may vary based on the mixer's generation (Drive vs. Non-Drive side).
• Recommendation: Cross-checking the Sicoma spare parts catalogue against your mixer's serial number is mandatory for correct part identification.

Installation notes:

• To install the cover, you may need:
  • VEA32 Bolt TE M14x40 / 8.8 / UNI 5739: 6 pcs.
  • RD014 Spring Lock Grover Washer D.14: 6 pcs.
  • STAE18 Greaser G 1/8'' / 180°: 1 pcs.
• Surface Prep: Flange warping is often a result of bad installation. Mating faces and O-ring grooves must be spotless, dry, and burr-free before assembly.
• Torque Strategy: The tightening process is not random. Use a criss-cross (star) pattern sequence and hit the exact manufacturer's torque spec. This is the only way to achieve the even O-ring compression needed for a leak-proof seal.
• For critical maintenance, installation should be performed by a qualified technician.