661N Contitech Bus Air Rubber Bellows 1E25 Phoenix Volvo 1137882 1137888 3159253 Bus Air Spring

• Durability: Utilizing high-strength rubber and cord layers, it resists wear and aging, and can withstand frequent compression and road vibration.
• Sealing: A high-quality sealing design prevents air leakage, ensuring long-term stable air pressure support.
• Load Capacity: Designed specifically for medium to large buses, it can withstand both dynamic and static vehicle loads.
• Temperature Adaptability: Maintains performance over a wide temperature range (-40°C to +70°C).
• Installation Compatibility: Compatible with a variety of bus suspension systems, including common brands such as ZF, SAF, and Hendrickson.

Installation Tools:

• Jack (support the axle)
• Torque wrench (tighten bolts according to manufacturer's specifications)
• Soapy water (for leak detection)

Installation Procedure:

1. Vehicle Safety Preparation: Stop the vehicle, support the axle with a jack, and release the suspension load. Disconnect the air supply and bleed any residual air pressure from the airbag.
2. Removing the old airbag: Remove the mounting bolts/clamps, and check for rust on the sealing surfaces between the airbag and the upper and lower covers.
3. Installing the new airbag: Clean the mounting surface to prevent dust from affecting the seal. Align the bolt holes, manually pre-tighten, and tighten to the manufacturer's torque (e.g., 50-60 Nm).
4. Airtightness Test: Inflate to operating pressure, spray with soapy water, and check for bubbles (focusing on the bolt joints and airbag folds).

Key Precautions:

• No Lubrication: Do not use grease on rubber-to-metal contact surfaces to prevent corrosion.
• Inflation sequence: After installation, inflate to 1-2 bar before lowering the vehicle to avoid tearing of the airbag folds.