U-Cup Seal 170×180×13 mm – SICOMA MAO 3000/2000 – PA102
Function: What PA102 U-cup seal does on SICOMA MAO 3000/2000
This advanced dynamic shaft seal is engineered for the heavy-duty sealing groups of larger SICOMA MAO twin-shaft mixers, typically found in high-capacity ready-mix concrete batching plants. Unlike standard rubber seals, the PA102 features a composite construction: a highly abrasion-resistant blue Polyurethane (PU) body reinforced with an internal black elastomeric O-ring. The design ensures the sealing lip keeps constant radial pressure on the 170 mm shaft even when pressure is low. It is an essential barrier to hold grease in place and stops fine cement and abrasive slurry from entering in stationary concrete plants. Together with oil seals and intermediate rings, it forms one of the key shaft sealing group components on SICOMA MAO 3000/2000 mixers.
Technical snapshot: PA102 dimensions and materials
This PA102 U-cup seal is part of the wider range of SICOMA mixer spare parts used on heavy-duty twin-shaft concrete mixers.
- Part code: PA102
- Application: SICOMA MAO 3000/2000 (and specific large-frame models) shaft sealing group
- Nominal dimensions: 170×180×13 mm
- Inner Diameter (ID): 170 mm
- Outer Diameter (OD): 180 mm
- Thickness/Width: 13 mm
- Material: Body: High-performance Polyurethane (PU) | Core: NBR O-Ring energizer.
- Profile: Asymmetric "U" profile for optimized dynamic sealing and grease retention.
Abbreviations:
- PU: Polyurethane
- ID / OD: Inner Diameter / Outer Diameter
Why replacing PA102 U-cup seal matters?
Sealing effectiveness relies entirely on constant radial pressure. A seal works only as long as it actively pushes against the shaft. When the PU lip wears down or the internal O-ring loses its elasticity (memory):
- The essential contact pressure fades and the barrier is broken.
- Protective grease flows out of the housing.
- Abrasive slurry forces its way in, initiating a destructive exchange.
- The inevitable outcome is severe damage to both the main bearing and the shaft surface.
In practice, a failed PA102 usually leads to contaminated bearings, overheating, and costly unplanned downtime for the concrete mixer.
What to check before ordering PA102?
The PA102 (170x180x13) is a specific size utilized on larger frame models or specific shaft revisions of the SICOMA MAO series.
- Compatibility Alert: It is generally incompatible with standard smaller models (like MAO 1500/1000) which feature smaller shaft diameters.
- Recommendation: Caliper measurement of the seal housing (180 mm) and shaft diameter (170 mm) is mandatory for correct part identification.
Installation notes: SICOMA MAO 3000/2000 – PA102
- Cleanliness: Successful installation demands a clean, burr-free groove to prevent damage to the PU material.
- Technique: Due to its flexibility, the U-Cup can be folded into a "kidney shape" for insertion into closed grooves; however, use of sharp tools must be avoided.
- Orientation: The sealing lip must face the pressure source (the grease side).
- Critical Check: Ensure the internal black O-ring does not twist or dislodge within the groove during fitting.
- For critical applications, installation should be carried out by a qualified maintenance technician.
Delivery Time:
- If the product is not in stock, it is delivered to order, usually within 4-6 weeks after making an advance payment.
- Some items may be in transit, so checking the delivery time before ordering is recommended.
Commercial Note:
All quotations and proforma invoices for this item are issued in EURO (EUR). Please request a formal offer for current pricing.