2901918500: UNLOADERKIT MB C146

The Atlas Copco 2901918500 Unloaderkit MB C146 is a genuine service kit manufactured by Atlas Copco in Belgium (Origin: BE) for oil-injected screw air compressors. This comprehensive unloader kit contains all essential components required to overhaul and restore the unloader valve assembly to factory-specification performance.

Product Introduction

The unloader valve is a mission-critical component in any oil-injected screw compressor. It regulates the compressor’s loading and unloading cycles, controls pressure buildup, and manages the blow-down function during shutdown. A properly functioning unloader assembly ensures smooth start-stop operation, prevents the compressor from running under excessive load, and protects the entire air system from pressure-related damage. When the unloader valve wears out or fails, the compressor may fail to stop, experience stuck air conditions, or suffer from inefficient operation.

This overhaul kit provides everything you need to rebuild the unloader assembly in one convenient package – eliminating the hassle of sourcing individual components separately and guaranteeing perfect compatibility with your Atlas Copco air compressor.

We supply this genuine Atlas Copco unloader kit. We source every unit directly from Atlas Copco (Shanghai) Trading Co., Ltd. , ensuring that each kit is brand new, 100% genuine, and factory-original. When you purchase from us, you receive authentic Atlas Copco parts with complete traceability – every genuine Atlas Copco spare part carries a unique QR code on its packaging label, allowing you to verify authenticity in under five seconds through the official app.

Product Specifications

Specification	Detail
Part Name	UNLOADERKIT MB C146
Part Number	2901918500
Reference Numbers	2901-9185-00, 2901 9185 00
Origin	Belgium (BE)
Tariff Code	84149000
Length	163 mm
Width	165 mm
Height	81 mm
Weight	861.825 g
Manufacturer	Atlas Copco
Supply Source	Atlas Copco Shanghai Trading Co., Ltd.
Condition	Brand New, 100% Genuine Original

Component List

Component Description	Quantity
O-RING	1
ASSEMBLY	1
QUADRING C146	1
GUIDE	1
GUIDANCE TAPE	1
INLET VALVE	1
TUBE GREASE	1
O-Ring	1
O-RING OVAL	2
INSTR. ASSEMBLY (Instruction Manual)	1
O-RING	1
BUSHING	1
WASHER PLAIN	1
WASHER M16	1
BOV Assy KIT (Blow-Down Valve Assembly Kit)	1
O-RING 179X3	1
BUSHING	1
SPRING	2
SEAL	1
SCREW	1
HEX. SOCK M10X80X10.9	1

Product Advantages

1. Complete All-in-One Overhaul Solution
This kit contains every single component required for a full unloader valve rebuild. Rather than purchasing O-rings, quadrings, springs, bushings, seals, and valves individually, you receive all 22 components in one convenient package. This simplifies the ordering process, reduces procurement time, and guarantees that you never miss a critical part during maintenance.

2. Genuine Atlas Copco Quality Assurance
Every component in this kit meets Atlas Copco’s stringent manufacturing standards. Genuine parts guarantee optimal air quality, reliable performance, and extended service life. The kit includes the INSTR. ASSEMBLY (instruction manual) to guide you through the installation process, ensuring correct assembly every time.

3. Cost-Effective Maintenance Strategy
Purchasing the complete unloader kit proves significantly more cost-effective than buying each component individually. The kit format also reduces service parts ordering to a single item, resulting in easy follow-up and streamlined inventory management.

4. Energy Efficiency and Operational Savings
A properly maintained unloader valve reduces unnecessary load on the compressor during periods of low demand. This directly translates into significant energy savings and reduced operating costs over time. By preventing the compressor from running under excessive or unnecessary load, the kit helps optimize your entire compressed air system’s efficiency.

5. Extended Compressor Longevity
The unloader valve plays a vital role in protecting the compressor element and entire air system. Regular overhaul using genuine air compressor parts prevents premature wear, reduces the risk of catastrophic failure, and extends the service life of your Atlas Copco compressor investment.

6. Factory Traceability and Authenticity
Every genuine Atlas Copco spare part features a unique, non-reproducible QR code on its packaging label. Scan the code with your phone, follow the steps in the app, and verify authenticity in less than five seconds. This guarantees you receive exactly what you pay for – no counterfeits, no substitutes.

Installation Step

While detailed installation instructions are provided in the INSTR. ASSEMBLY (instruction manual) included with each kit, the following general steps outline the overhaul process:

Step 1: Preparation

• Isolate the compressor from the power supply and depressurize the air system completely.
• Allow the compressor to cool to ambient temperature.
• Gather all required tools and ensure a clean working environment.

Step 2: Remove the Unloader Assembly

• Access the unloader valve assembly on your Atlas Copco compressor.
• Carefully disconnect all air lines and mounting hardware.
• Remove the existing unloader assembly from the compressor.

Step 3: Disassemble and Inspect

• Disassemble the old unloader valve following the instruction manual.
• Inspect all internal surfaces for wear, scoring, or damage.
• Clean all reusable metal components thoroughly.

Step 4: Install New Components

• Replace all O-rings, quadrings, seals, and gaskets with the new components from the kit.
• Install the new GUIDE, GUIDANCE TAPE, and INLET VALVE.
• Replace both SPRINGS, both BUSHINGS, and the SEAL.
• Install the new BOV Assy KIT (Blow-Down Valve Assembly).
• Apply the provided TUBE GREASE to all moving parts and sealing surfaces.

Step 5: Reassemble and Reinstall

• Reassemble the unloader valve following the torque specifications in the instruction manual.
• Reinstall the rebuilt unloader assembly onto the compressor.
• Reconnect all air lines and mounting hardware.
• Secure with the provided HEX. SOCK M10X80X10.9 screw and WASHER M16.

Step 6: Testing

• Restore power and air supply to the compressor.
• Perform a functional test to verify proper loading and unloading cycles.
• Check for air leaks around all newly installed seals and connections.
• Monitor compressor operation for at least one complete cycle.

Note: Installation should only be performed by qualified service personnel familiar with Atlas Copco air compressor systems.

Why Choose Us?

We are your trusted partner for genuine Atlas Copco air compressor parts and service solutions. We maintain a direct supply chain from Atlas Copco (Shanghai) Trading Co., Ltd. , guaranteeing that every product we deliver is:

• 100% Brand New – Never used, never refurbished.
• Genuine Original – Factory-authentic Atlas Copco parts.
• Full Traceability – Complete documentation and QR code verification.
• Competitively Priced – Direct sourcing without unnecessary markups.

We understand the critical nature of compressed air systems in industrial operations. Downtime costs money, and using substandard or counterfeit parts risks equipment damage, safety hazards, and production losses. When you choose us, you choose peace of mind.

Ready to Order?

The UNLOADERKIT MB C146 (2901918500) is in stock and ready for immediate dispatch. Every kit is sourced directly from Atlas Copco (Shanghai) Trading Co., Ltd. – brand new, 100% genuine, and backed by our commitment to quality.

Contact us today to provide your compressor model and serial number, and our technical team will verify compatibility and provide a formal quotation within 24 hours.

Bulk orders, urgent deliveries, and long-term supply agreements are welcome. We ship worldwide.

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