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The WEICHAI WP12 Oil Suction Strainer Group is a precision-engineered metal filter screen assembly mounted at the inlet of the oil pump suction pipe inside the oil pan of WP12 heavy-duty diesel engines. As the first stage of the engine’s three-level oil filtration system, the WEICHAI WP12 Oil Suction Strainer Group protects the oil pump and all downstream components from damage caused by large contaminants and metal particles. As genuine WEICHAI Engine Parts, this strainer group is manufactured to original equipment specifications, ensuring proper filtration efficiency and reliable lubrication system performance across all WP12 variants from 336 HP to 550 HP.
The WEICHAI WP12 Oil Suction Strainer Group is a metal screen filter assembly installed at the inlet of the oil pump suction pipe, positioned inside the oil pan beneath the engine oil level. This strainer group serves as the first stage of the engine’s three-level oil filtration system (strainer → full-flow oil filter → bypass filter), responsible for trapping large contaminants, metal particles, carbon deposits, and sludge before they can enter the oil pump and the main lubrication circuit.
The WEICHAI WP12 Oil Suction Strainer Group consists of a stamped steel or cast aluminum mounting flange, a perforated metal suction pipe, a fine-mesh stainless steel filter screen, and a sealing O-ring or gasket. The filter screen uses a metal wire mesh design that is washable and reusable, with typical mesh fineness ranging from 40 to 150 microns. The assembly is attached to the oil pump body or the cylinder block using bolts, with a sealing ring preventing air ingress that could cause oil pump cavitation.
The WEICHAI WP12 Oil Suction Strainer Group is a fixed-position strainer (as opposed to a floating strainer design), located at the lowest point of the oil pan to ensure continuous oil supply even during vehicle tilting or acceleration. The fixed strainer design avoids the risk of foam ingestion associated with floating strainers and provides more consistent lubrication stability. The strainer is also equipped with a bypass valve that opens if the screen becomes clogged, allowing emergency oil flow to prevent engine oil starvation.
Applications for the WEICHAI WP12 Oil Suction Strainer Group include Shacman X3000/F3000/X5000, Sinotruk HOWO A7/T7H, Beiben trucks, Hongyan vehicles, JAC trucks, CAMC vehicles, Yutong buses, Kinglong buses, SDLG wheel loaders, XCMG excavators, marine WP12C engines, and stationary generator sets. The strainer group is compatible with all WP12 engine variants across Euro III, Euro IV, Euro V, and China VI emission standards. OEM part number references include 612630010134 and 1421711-00141-001, with sealing components such as gaskets (612640130438) and O-rings available as replacement service parts.
Counterfeit strainer groups often use inferior mesh material with inadequate corrosion resistance, insufficient filtration fineness, or poor sealing surfaces, leading to debris bypass, oil pump wear, and engine damage. Always source genuine WEICHAI WP12 Oil Suction Strainer Group components from authorized distributors to ensure proper filtration efficiency, reliable oil pump protection, and long-term engine durability. The WP12 engine platform has undergone over 45,000 hours of cumulative bench testing and over 50 million kilometers of road testing, proving the reliability of every lubrication system component.
| NO. | Part NO | Description |
|---|---|---|
| 1 | 612630010134 | Oil Suction Strainer Assembly (Complete with Screen and Mounting Flange) |
| 2 | 1421711-00141-001 | Oil Suction Strainer / Oil Pickup Screen (OEM Reference) |
| 3 | 612640130438 | Lubricating Oil Suction Strainer Gasket (Sealing Ring) |
| 4 | 90011400039 | Oil Suction Tube Seal / O-Ring (Suction Pipe Seal) |
| 5 | 612600010581 | Oil Pump Suction Pipe Assembly (Includes Strainer Mount) |
| 6 | 612600010575 | Oil Suction Pipe Bolt Set (Mounting Hardware) |
| 7 | 612600010107 | Oil Pump O-Ring / Seal Ring (Suction Side) |
| 8 | 612600010635 | Oil Pan Gasket (Oil Sump Seal, Replacement Service) |
| 9 | 612600010647 | Oil Pan Screw / Bolt Set (Oil Pan Fasteners) |
The table above lists common service parts for the WEICHAI WP12 Oil Suction Strainer Group. When replacing the strainer assembly, always install a new sealing gasket (612640130438) or O-ring (90011400039) to ensure a leak-proof seal and prevent air ingestion. The strainer’s metal screen is washable and reusable, but if the screen is damaged or heavily clogged, the complete strainer assembly should be replaced. The WP12 lubrication system maintains normal oil pressure of 350-550 kPa (50-80 psi) at full load and 80-95°C water temperature.
The WEICHAI WP12 Oil Suction Strainer Group traps large contaminants and metal particles before they reach the oil pump, preventing pump scoring, bearing damage, and catastrophic engine failure. As the first stage of the three-level filtration system, it ensures that only clean oil enters the full-flow filter for final purification.
The filter screen is manufactured from high-quality stainless steel wire mesh with typical fineness of 40-150 microns. The screen is washable and reusable, allowing multiple service cycles before replacement is needed. The robust construction resists corrosion from oil additives and withstands engine operating temperatures up to 120°C.
The WEICHAI WP12 Oil Suction Strainer Group uses a fixed-position (non-floating) design, located at the lowest point of the oil pan. This provides stable oil pickup during vehicle tilting, acceleration, and deceleration, avoiding foam ingestion problems associated with floating strainer designs and ensuring consistent lubrication pressure across all operating conditions.
No modifications required for WP12 engines in Shacman, Sinotruk, Beiben, Hongyan, JAC, CAMC, Yutong, Kinglong, SDLG, XCMG, marine, and generator applications. Bolt-on replacement with factory-specified torque values. Compatible with both mechanical pump and common rail WP12 variants across all emission standards.
Each WEICHAI WP12 Oil Suction Strainer Group undergoes rigorous quality control including mesh integrity testing, flow capacity verification, dimensional inspection, and sealing surface flatness verification. IATF 16949 certified quality with full traceability. All strainers are 100% tested for debris trapping efficiency before dispatch.
Worldwide shipping from regional warehouses. Free strainer installation torque charts (mounting bolts: 7-10 N·m), screen cleaning procedures, and troubleshooting guides provided with each order. Volume discounts available for fleet customers and engine rebuilders.
Unlike aftermarket strainers that use inferior mesh material with inadequate corrosion resistance or improper sealing surfaces, our genuine WEICHAI WP12 Oil Suction Strainer Group is manufactured to original equipment specifications with documented quality control. The stainless steel screen is double-layer welded construction, ensuring structural integrity even under high oil flow conditions during cold starts when oil viscosity is highest. Independent laboratory testing confirms that our strainer maintains >95% filtration efficiency for particles larger than 100 microns.
The strainer group is designed with a built-in bypass valve that opens when the screen becomes clogged, allowing emergency oil flow to prevent engine starvation. The bypass valve opening pressure is precisely calibrated to ensure normal operation does not trigger the bypass, while providing protection when the strainer requires service. The mounting flange features precision-machined sealing surfaces that work with the OEM-spec gasket or O-ring to prevent air ingress, eliminating the risk of oil pump cavitation and aeration that can damage bearings.
Technical support includes strainer installation procedures: drain engine oil, remove oil pan, clean oil pan mating surfaces, remove old strainer assembly, inspect suction pipe for damage, install new sealing gasket, position strainer with correct orientation, torque mounting bolts to 7-10 N·m, reinstall oil pan with new gasket (612600010635), and refill with recommended oil (SAE 15W40 API CI-4+ or CK-4). Troubleshooting guides for symptoms like low oil pressure (clogged strainer or suction leak), oil pump noise (air ingestion from damaged seal), and metal particles in oil (strainer screen damage) are provided.
For fleets, sample testing is available. Order one WEICHAI WP12 Oil Suction Strainer Group for trial; volume pricing applies. Many customers report over 500,000 km trouble-free lubrication system operation after replacing clogged or damaged original strainers with our genuine components. We provide cross-reference support for part number verification based on your engine serial number and oil pan configuration.
Also monitor oil consumption and engine performance. A gradual increase in oil consumption combined with low oil pressure may indicate a clogged WEICHAI WP12 Oil Suction Strainer Group restricting oil flow to the pump. If the engine experiences sudden oil pressure loss, stop immediately—a completely clogged strainer can cause catastrophic engine damage within minutes.
For severe-duty applications (mining, construction, heavy haul, marine), reduce inspection intervals to every 25,000 km (15,000 miles) or 250 operating hours. High ambient temperatures and dusty environments accelerate oil degradation and debris accumulation in the strainer screen. Marine applications require additional corrosion checks—saltwater environments can accelerate corrosion of the strainer screen and mounting hardware.
When cleaning the WEICHAI WP12 Oil Suction Strainer Group, use clean solvent or diesel fuel, followed by compressed air to blow debris from the inside out. Do not use wire brushes or metal tools that could damage the screen mesh. Inspect the screen under bright light for holes or tears—any damage requires immediate strainer replacement. After cleaning, verify that the bypass valve (if equipped) opens and closes freely.
Maintain a logbook of all lubrication system maintenance: dates of oil changes, oil pressure readings, oil analysis results, strainer inspections, seal replacements, and any abnormal findings. For fleet operators, tracking oil pressure trends over time is a powerful predictive maintenance tool—a gradual decline in oil pressure at operating temperature often indicates progressive strainer clogging, providing ample warning before complete blockage occurs.
In summary, the WEICHAI WP12 Oil Suction Strainer Group features washable stainless steel screen construction, fixed-position design for stable lubrication, and integrated bypass valve for emergency oil flow protection. Whether you are rebuilding a Shacman X3000, Sinotruk HOWO, Beiben truck, Yutong bus, SDLG wheel loader, marine vessel, or generator set, choosing a genuine oil suction strainer group directly impacts oil pump longevity, bearing protection, and overall engine reliability.
For workshops performing in-frame overhauls, we recommend ordering the WEICHAI WP12 Oil Suction Strainer Group together with a complete lubrication system service kit including oil pan gasket (612600010635), strainer seal (612640130438 or 90011400039), oil filter, and oil pump O-ring (612600010107). This approach eliminates hidden failures and gives your customer a worry-free warranty period. The strainer group is pre-inspected for mesh integrity and sealing surface flatness before shipment.
Our inventory includes both standard strainer assemblies for highway truck applications and heavy-duty variants for off-highway and marine applications. The standard WEICHAI WP12 Oil Suction Strainer Group provides excellent service life for long-haul trucking, while marine variants feature enhanced corrosion-resistant coating for saltwater environments. We provide cross-reference support for part number verification—please provide your engine serial number for accurate matching.
We provide after-sales documentation including dimensional inspection reports, mesh integrity certifications, material certificates (stainless steel screen composition), and installation torque specifications upon request. Every WEICHAI WP12 Oil Suction Strainer Group is packaged in protective foam-lined boxes to prevent damage during shipping. Bulk orders receive custom palletizing and export documentation assistance.
All specifications based on original WEICHAI WP12 engine data. Cross-check part numbers with engine serial number. The WEICHAI WP12 Oil Suction Strainer Group includes OEM references 612630010134 (complete assembly) and 1421711-00141-001 (OEM). Always replace sealing gasket (612640130438) or O-ring (90011400039) when strainer is removed, torque mounting bolts to 7-10 N·m, and inspect screen for damage before reinstallation.
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