WEICHAI WP12 Air Compressor Group

The WEICHAI WP12 Air Compressor Group (OE No. 612630030047 / 61800130043) is a high-performance twin-cylinder water-cooled compressor assembly that provides compressed air for braking systems and pneumatic accessories on WP12 heavy-duty diesel engines. As genuine WEICHAI Engine Parts, this air compressor group is designed for exceptional reliability across all WP12 variants from 336 HP to 550 HP. The WEICHAI WP12 Air Compressor Group features a robust water-cooled design, 2 cylinders with φ86 mm bore and 40 mm stroke, 464.7 ml displacement, and maximum working pressure of 0.8 MPa.

WEICHAI WP12 Air Compressor Group – Twin-cylinder water-cooled compressor assembly (OE 612630030047) for WP12 diesel engines.

What is the WEICHAI WP12 Air Compressor Group?

Product Parameters of WEICHAI WP12 Air Compressor Group

The table above lists common service parts for the WEICHAI WP12 Air Compressor Group. The complete air compressor assembly (612630030047) has a displacement of 464.7 ml, working pressure of 0.8 MPa, rated speed of 3,000 r/min, displacement of ≥720 L/min, and shaft power ≤7.8 kW [6†L2-L4]. The water-cooled cylinder liner design reduces cylinder wall temperature, decreases oil carryover, and effectively lowers failure rates, improving component reliability [4†L17-L20].

Why Choose Our WEICHAI WP12 Air Compressor Group?

Unlike aftermarket compressors that use inferior materials and lack proper water-cooling, our genuine WEICHAI WP12 Air Compressor Group is manufactured to original equipment specifications with documented quality control. The water-cooled cylinder liner design is a key differentiator that significantly improves reliability. The cooling system reduces cylinder wall temperature, minimizing thermal stress on components and preventing oil coking inside the compressor. This results in lower oil carryover into the air system, protecting downstream brake valves, air dryers, and other pneumatic components [4†L17-L20].

The WEICHAI WP12 Air Compressor Group is designed to withstand the extreme conditions generated by the WP12 engine’s turbocharged common rail architecture. The compressor is mounted at the front of the engine and driven directly by the gear train, eliminating belt slippage and reducing maintenance requirements. The gear drive provides consistent compressor speed regardless of engine load, ensuring stable air output across all operating conditions. The compressor’s robust construction and water-cooled design make it particularly suitable for heavy-duty applications where continuous compressor operation is required.

Technical support includes air compressor installation procedures: ensure engine is cool, drain coolant if required, disconnect air lines and water lines, remove old compressor, clean mounting surfaces, install new gasket, position compressor (612630030047), tighten mounting bolts to specification, torque gear mounting nut to 200-250 N·m, reconnect water and air lines, refill coolant if drained, run engine to check for leaks, and verify air pressure build-up. Troubleshooting guides for symptoms like insufficient air output (worn rings or valves), oil carryover (failed piston rings or cylinder wear), compressor overheating (coolant flow restriction), and unusual noise (worn bearings or loose gear drive) are provided.

For fleets, sample testing is available. Order one WEICHAI WP12 Air Compressor Group for trial; volume pricing applies. Many customers report over 500,000 km trouble-free compressor operation after replacing failed original units with our genuine components. We provide cross-reference support for part number verification—please provide your engine serial number for accurate matching. We stock both complete compressor assemblies (612630030047, 61800130043) and individual repair kits for partial overhauls.

What are the Routine Maintenance Considerations for the WEICHAI WP12 Air Compressor Group?

Also monitor the air dryer and brake system for signs of oil carryover. If the air dryer discharges oil or the brake valves become contaminated, the WEICHAI WP12 Air Compressor Group may have worn piston rings or cylinder scoring. In such cases, overhaul or replace the compressor immediately to prevent damage to the entire air brake system.

For severe-duty applications (mining, construction, heavy haul, marine), reduce compressor inspection intervals to every 25,000 km (15,000 miles) or 250 operating hours. High ambient temperatures, dust, and continuous operation accelerate ring wear and valve degradation. Marine applications require additional corrosion checks—saltwater environments can corrode the compressor housing and water lines. Use marine-grade coolant with anti-corrosion additives in marine applications.

When overhauling the WEICHAI WP12 Air Compressor Group using the repair kit (612630030047), always replace all gaskets, piston rings, inlet and exhaust valves, and seals. Clean all components thoroughly before reassembly. Lubricate piston rings and cylinder walls with clean engine oil during assembly. After reassembly, torque all fasteners to specification, refill coolant, and run the engine to verify proper operation and check for leaks.

Maintain a logbook of all air compressor maintenance: dates of inspections, leak detection findings, oil analysis results, air pressure build-up times, and any abnormal findings. For fleet operators, tracking air pressure build-up time is a powerful predictive maintenance tool—a gradual increase in build-up time often indicates developing compressor wear, providing ample warning before complete failure occurs. Regular air compressor inspection and maintenance ensure the WP12 engine’s brake system remains reliable and safe.

In summary, the WEICHAI WP12 Air Compressor Group features water-cooled cylinder liner design for superior reliability, twin-cylinder configuration (2×φ86×40 mm) with 464.7 ml displacement, 0.8 MPa working pressure, ≥720 L/min output, gear-driven precision timing, and direct fitment for all WP12 applications. Whether you are rebuilding a Shacman X3000, Sinotruk HOWO, Beiben truck, Yutong bus, SDLG wheel loader, marine vessel, or generator set, choosing a genuine air compressor group directly impacts brake system safety, vehicle reliability, and overall uptime.

For workshops performing in-frame overhauls, we recommend ordering the WEICHAI WP12 Air Compressor Group as a complete kit including the compressor assembly (612630030047), gasket set, and mounting hardware. For partial overhauls, the repair kit (612630030047) provides all necessary components to rebuild an existing compressor. This approach eliminates hidden failures and gives your customer a worry-free warranty period. All compressors are pre-inspected for displacement, pressure output, and leak-tightness before shipment.

Our inventory includes both standard compressors for highway truck applications (612630030047) and marine variants (612630030336) with enhanced corrosion protection for saltwater environments. The standard WEICHAI WP12 Air Compressor Group provides excellent service life for long-haul trucking, while marine variants feature additional corrosion-resistant coatings for saltwater resistance. We provide cross-reference support for part number verification—please provide your engine serial number for accurate matching. We stock complete compressor assemblies, individual repair kits, gaskets, and mounting hardware.

We provide after-sales documentation including compressor displacement test certificates, pressure output verification reports, material certificates, installation torque specifications (gear nut: 200-250 N·m), and diagnostic trouble code (DTC) guides for compressor-related faults upon request. Every WEICHAI WP12 Air Compressor Group component is packaged in protective foam-lined boxes to prevent damage during shipping. Bulk orders receive custom palletizing and export documentation assistance. Express shipping available for urgent repairs—most orders dispatched within 24 hours.

All specifications based on original WEICHAI WP12 engine data. Cross-check part numbers with engine serial number. The WEICHAI WP12 Air Compressor Group includes OEM references 612630030047 (twin-cylinder assembly, 2×φ86×40, 464.7ml, 0.8 MPa, ≥720 L/min, ≤7.8 kW) and 61800130043 (heavy-duty variant). Always torque compressor gear mounting nut to 200-250 N·m, maintain proper coolant level, use clean engine oil, and verify no air, water, or oil leaks after installation [6†L2-L4].