The BOM (verbatim, redacted)
The "30CV 1130" naming convention is interesting. "CV" is cheval-vapeur (metric horsepower; 30 CV ≈ 22 kW); "1130" appears to be a specific engine model designation. This combination corresponds to a Lister, Kohler, Yanmar, Kubota, or Chinese-OEM small diesel engine that's common across Sub-Saharan Africa for agricultural pump sets, small fishing vessels, light commercial vehicles, and portable generator sets. The buyer probably has installed equipment using these engines and needs to keep replacing units as they wear out, plus stocking adequate spares for the existing installed base.
- Engines: 10 units of Diesel 30CV 1130 engines (small diesel engine class, ~22 kW power range)
- Air filters: 50 pieces (5 per engine, 5-cycle inventory)
- Fuel filters: 50 pieces (5 per engine)
- Oil filters: 50 pieces (5 per engine)
- Engine oil: 200 litres of SAE 40 (sufficient for ~25-40 oil changes depending on engine sump capacity)
- Gasket kits: 20 sets (2 per engine — major service intervals)
- Head gaskets: 20 pieces (separate from gasket kits — top-end overhaul reserve)
- Injector nozzles: Quantity to be confirmed (typically 4-6 per engine in this class)
- Plus other associated parts: To be specified after technical confirmation
Why DRC fleet diesel procurement is its own category
For a fleet operating in DRC — where local parts availability varies dramatically by region and many parts must be imported from China, Dubai, or South Africa — running out of filters or engine oil means stopping production. The 5-cycle filter inventory in this BOM isn't excessive; it's prudent operational planning that accounts for 6-12 month resupply cycles and unpredictable in-transit delays.
DRC's tropical climate (high temperature, high humidity, often dusty operating conditions) shortens engine and component lifespans compared to temperate-climate operating environments. Air filters foul faster, oil degrades faster, gaskets fail sooner. Service interval compression of 30-50% vs manufacturer specifications is typical. That's why the buyer is stocking what looks like generous spare quantities — the actual consumption rate justifies it.
Diesel fuel quality in DRC varies widely by source. Contaminated fuel accelerates injector wear, clogs filters faster, and degrades engine oil more rapidly. The buyer's stock of fuel filters (5 per engine over the service horizon) and the inclusion of injector nozzles in the BOM reflects this reality. A serious supplier acknowledges this in their recommendations — for example, suggesting upgraded filtration if the buyer's fuel quality is known to be challenging.
What separates a real diesel spares supplier from a parts trader
The "30CV 1130" specification is precise enough that a real supplier verifies engine compatibility before quoting. Common questions: which manufacturer's engine variant? (the 30CV class is produced by multiple OEMs), what's the bore × stroke? (key for gasket and ring compatibility), what's the injector design? (4-hole vs 5-hole pattern, opening pressure spec). A trader quotes a generic "30 CV diesel parts" without these technical verifications and may ship incorrect parts.
Air, fuel, and oil filters all use specific filtration media optimised for each application. Premium filters use cellulose or synthetic glass-fibre media with documented filtration efficiency (β-ratio per ISO 16889). Cheap filters use lower-grade media that lets contamination through, accelerating engine wear. For an operator running 10 engines for years, the difference between premium and cheap filters can be 30-50% reduction in engine overhaul intervals — significantly more than the cost difference in filters.
SAE 40 monograde engine oil is appropriate for older or simple diesel engines operating in warm climates without wide temperature variation — common spec for the 30CV class in tropical Africa. However, "SAE 40" alone is incomplete spec — modern oils should also specify API service category (CD, CF, CF-4, CI-4, CK-4 for diesel applications, each with progressively better wear protection and oxidation resistance). Premium suppliers specify both SAE grade and API service category; cheap suppliers ship oil that meets only the SAE viscosity grade with no API performance certification.
The supplier we matched this inquiry with
Linlan Corp — supplier of marine engine and diesel spares with experience across major engine OEMs including small commercial diesel engines used in fishing, agricultural, and light commercial applications. Aftermarket-fit cross-reference parts for filters, gaskets, injector nozzles, and engine components. Experienced with African fleet operator customers including DRC, Nigeria, Tanzania, and Ghana destinations.
Companion suppliers: Coralfly Filter for premium filter element cross-references including air, fuel, and oil filters with documented β-ratio testing. For larger engine OEM cross-references (MAN B&W, Wärtsilä, Caterpillar), Linlan Corp covers comprehensive marine diesel applications.
→ View Linlan Corp profile · → Read the marine engine spares guide
Technical verification before quoting
Before a supplier can accurately quote this BOM, the technical verification questions need to be answered:
- OEM origin: Lister Petter, Yanmar, Kubota, Changfa, Changchai, or other Chinese manufacturer? The 30CV class is produced by multiple OEMs with different internal designs.
- Bore × stroke specifications: e.g., 95 × 105 mm (typical for one variant) vs 98 × 110 mm (another variant). Affects gasket sizing and piston ring compatibility.
- Cooling type: water-cooled or air-cooled? Different gasket sets and seal requirements.
- Application context: stationary (agricultural pump, generator) or vehicle propulsion? Affects parts selection priorities.
- Filter element specifications: exact part numbers if known; if not, supplier should request engine model number and serial range to cross-reference.
- Gasket material: composite (standard), graphite (premium), or copper (specialty high-temperature applications)?
- Head gasket specification: the head gasket is a separate, more critical component than the gasket kit — verify thickness, material, and any specific bolt-pattern compatibility.
- Injector nozzle pattern: 4-hole vs 5-hole, opening pressure spec (typically 180-220 bar for this engine class).
How to compare quotes for diesel engine spares
- Engine compatibility verification — does the supplier confirm specific OEM compatibility for each engine in the order, or are they shipping generic "30 CV" parts?
- Filter quality tier — premium suppliers specify β-ratio per ISO 16889; cheap suppliers don't. The economics of premium filters (10-30% higher cost, 50-70% less engine wear) strongly favour the premium tier for fleet applications.
- Engine oil specification — verify both SAE grade AND API service category. Premium API CI-4 or CK-4 oils significantly extend service life vs basic API CD or CF.
- Gasket material and source — premium suppliers use Klingerit, Reinz, Elring, or comparable Chinese specialty manufacturers; cheap suppliers use generic composite without traceable manufacturer.
- Injector nozzle quality — Bosch-pattern aftermarket-fit (premium) vs generic Chinese (cheaper but potentially shorter service life).
- Packaging quality — for marine/African destinations with humid conditions, parts need moisture-resistant packaging. Individual filter elements in sealed bags; gasket kits in sealed pouches; injector nozzles in oil-impregnated wrap.
- Documentation per shipment — material certificates for gaskets, β-ratio test reports for filters, API certification for engine oil.
What to confirm before issuing a PO
- Engine OEM and specification confirmation — written confirmation of which 30CV variant the spares match, with specific bore × stroke and cooling system.
- Sample test on representative spare — for filters: send 5-10 samples and run in operation for 100-200 hours; verify pressure drop, dust capacity, and structural integrity. For gaskets: install on one engine and verify no leaks at operating pressure.
- Material and quality certifications — per the items: β-ratio per ISO 16889 for filters, material certificates for gaskets, API service classification for engine oil.
- Packaging for marine/African shipment — moisture-resistant individual packaging, sturdy outer cartons, palletised for cargo handling.
- Pre-shipment inspection — for orders above USD 8K, third-party inspection at supplier facility. For mixed-product shipments, sample inspection per category.
- Spare-parts continuity commitment — for fleet operators, the value of a supplier relationship is in repeat orders. Verify the supplier maintains stock of the standard SKUs you'll restock, with predictable lead times.
Logistics: China → DR Congo
- Sea freight via Dar es Salaam (Tanzania) — most common routing: Shanghai/Ningbo → Dar es Salaam is 22-30 days. Standard major-carrier service, well-established freight schedules. From Dar es Salaam, inland transport to DRC's eastern provinces (North Kivu, South Kivu, Katanga) via truck through the Northern Corridor — typically 7-14 days depending on border crossings and road conditions.
- Alternative routing via Mombasa (Kenya): Similar transit time China-Kenya; inland to eastern DRC via Uganda. Routing choice often depends on supplier and forwarder preferences plus current border conditions.
- Sea freight via Matadi (DRC's Atlantic port): Shanghai → Matadi via Cape of Good Hope is 35-45 days. Longer transit but direct delivery to DRC; from Matadi, inland to Kinshasa is 350 km. For deliveries to western DRC, this can be more economical than the eastern routing.
- Engine shipping specifics: 10 small diesel engines pack as ~15-25 cubic metres total, easily fitting in a 20' container with spare parts. Engines must be shipped with fuel and oil drained, batteries removed if applicable, and preservative coating to prevent corrosion during transit.
- Customs: DRC customs documentation requirements include commercial invoice, packing list, bill of lading, certificate of origin, and BIVAC (Bureau Inspection, Valuation, Assessment, and Control) inspection certificate for many product categories. BIVAC inspection adds 5-15 days to pre-shipment timeline and USD 600-1,500 in fees but is mandatory for many imports.
- Currency: DRC uses USD widely alongside the Congolese franc; most international procurement uses USD pricing. Letter of credit is standard for first-time supplier relationships; T/T common for established relationships.
- Local distribution: Kinshasa (capital, ~13M population) serves western DRC; Lubumbashi serves the southern mining region; Goma serves eastern DRC near Rwanda border. Inland transport infrastructure varies dramatically; plan accordingly.
Frequently asked questions
Indicative pricing for 30CV-class diesel engine spares from China: complete diesel engine (30CV 1130 class, basic configuration): USD 480-1,200 per unit depending on supplier tier and accessory specification. Air filter element (cross-reference): USD 4-12 per piece. Fuel filter element: USD 3-10 per piece. Oil filter (spin-on): USD 5-14 per piece. Engine oil SAE 40 API CD/CF: USD 1.20-2.20 per litre (200L = USD 240-440). Gasket kit (full engine): USD 35-95 per kit. Head gasket (single): USD 8-22 per piece. Injector nozzle (aftermarket-fit): USD 12-45 per piece. Compared to South African distributor pricing for equivalent parts, FOB China is typically 30-60% lower. After freight, duty, and supplier margin, landed cost in DRC is roughly 1.7-2.4x FOB China.
For mainstream applications in the 30CV diesel engine class, premium Chinese aftermarket-equivalent filters perform within ±10% of OEM specifications on β-ratio (ISO 16889 filtration efficiency) at significantly lower cost. Specific verification: request β-ratio test data per part number, compare against OEM published values, target β10 (10-micron filtration) ratio of 200+ for premium tier. Premium Chinese suppliers maintain ISO 16889-rated media in their filter elements; budget suppliers use lower-grade cellulose media that lets more contamination through. For fleet operators where engine longevity directly affects operating economics, premium filter selection is one of the highest-ROI procurement decisions available.
Manufacturer-specified service intervals are based on temperate-climate operation. For tropical DRC conditions with high temperature, humidity, and often dusty environments, compress service intervals by 30-50%: air filter replacement every 100-150 operating hours (vs 200 hour spec); oil change every 100-150 operating hours (vs 250 hour spec); fuel filter every 250-400 operating hours (vs 500 hour spec); major service (gaskets, head gasket inspection) every 1,500-2,500 operating hours (vs 3,000 hour spec). For engines running 8-12 hours/day, that's roughly 12-18 service cycles per engine per year — which explains why the buyer's 5-cycle inventory per engine is reasonable for a 3-4 month resupply horizon.
Standard pack: commercial invoice, packing list, bill of lading, certificate of origin, BIVAC pre-shipment inspection certificate (mandatory for many categories), engine specifications including dry weight per unit for customs valuation, material safety data sheets for engine oil and any chemicals, and HS classification documents. For diesel engines specifically, HS 8408.20 (compression-ignition internal combustion piston engines for vehicle propulsion) or 8408.90 (other) applies depending on application. Engine parts classify under HS 8409. DRC customs duty rates vary by category; verify with a Kinshasa-based customs broker. Plan 3-6 weeks total clearance time from arrival to inland transport.
Closing thought
Fleet diesel maintenance is a recurring procurement category where supplier reliability matters more than absolute lowest price. The DRC buyer's BOM signals operational maturity — they've planned for service-interval continuity, climate-stressed service compression, and the inevitable in-transit delays. A supplier who matches this discipline — verifying engine compatibility, specifying filter quality with β-ratio data, packaging properly for marine and inland transit, and committing to spare-parts continuity — earns a 5-10 year fleet relationship. The supplier who treats this as a one-time engine-plus-parts order will deliver acceptable product on the first shipment and lose to the supplier with better systems on the second.
Brand mentions: References to engine OEMs (Lister Petter, Yanmar, Kubota, Changfa, Changchai), filter manufacturers (Bosch), gasket manufacturers (Klingerit, Reinz, Elring), and certification standards (ISO 16889, SAE, API) are made for factual reference. Linlan Corp and other suppliers in our network are not authorised by or affiliated with these brand owners. Products are aftermarket-fit cross-reference equipment manufactured under each supplier's own brand or buyer private-label only.
Inquiry transparency: The BOM described above is reproduced from a real DRC buyer inquiry; all buyer-identifying details have been redacted. Engine specification "30CV 1130" interpreted based on common Sub-Saharan African fleet diesel naming conventions.
Engine safety and warranty: Using aftermarket-fit parts on equipment that's under OEM warranty may void warranty coverage. Verify warranty terms before substituting aftermarket components. For class-surveyed or regulatory-compliant equipment, additional restrictions may apply.
Pricing & specifications: All price ranges reflect general market observation. Confirm current pricing, MOQ, lead time, and engine compatibility directly with the supplier.
No middleman role: CifyChina provides supplier discovery and editorial content. All transactions occur directly between buyer and supplier through the contact channels published on the supplier's official website.
One specialty match for hydraulic pumps + three adjacent suppliers across crane / valve / marine equipment categories. All have visible product catalogues — visit the official sites for current pricing and to confirm specific part-number compatibility.
Vane Pump & Parts, Hydraulic Piston Pump & Parts — remanufactured 100% OEM-compatible. Vane pump cartridge kits compatible with Vickers / Denison / Eaton / Yuken. Hydraulic motor repair parts, complete pump rebuild kits (seals, bearings, gaskets), and remanufactured complete hydraulic pumps stated as 100% OEM-equivalent.
Industrial remote control + crane pendant control specialist. F21/F23/F24 series + joystick controllers for cranes, concrete pumps, and metallurgy.
Qingdao-based maritime industry supplier. Anchor chain, rigging & lashing, marine valves, ship equipment, life-saving equipment.
- Diesel Engine Spares for Service Fleet — DR Congo (companion DRC fleet inquiry)
- HYDAC Filter Cross-References — Zambian mining
- MacGregor Crane Refurbishment — Bangladesh shipyard
How to compare quotes when they all say "100% OEM-compatible"
Every Chinese hydraulic remanufacturer says their parts are "100% OEM-compatible." That phrase, by itself, is meaningless. Here's how to disambiguate:
- Cross-reference document — can you receive the supplier's full Vickers / Eaton / Denison / Yuken cross-reference table within 24 hours of asking? Real remanufacturers have this on file.
- Test report sample — can the supplier email you a sample test report for any pump in their catalogue, including pressure-cycle data and volumetric efficiency? If not, they don't test.
- Seal-kit specification — what brand of seals does the supplier use? Trelleborg, Parker, NOK, and SKF are the names that signal real OEM-grade. "We use professional seals" signals nothing.
- Bench-test photos / video — ask for photos or a 30-second video of one of their pumps under bench test. Suppliers who actually test will share this within hours; suppliers who don't will go silent.
- Marine reference — has the supplier shipped to a marine yard before, and can they name the project type (deck crane, provision crane, offshore lifting unit)? You're not asking for confidential customer names; you're asking for the project category.
What to confirm before issuing a PO
For a 12-line BOM crossing main motors, gearboxes, hydraulic pumps, and control electronics, the procurement checklist before issuing the PO usually includes:
- Lead time per line item — gearboxes and slew bearings are the long-lead items (8–12 weeks is normal); pumps and motors are 4–6 weeks; control boards 2–3 weeks. The PO should set a single Required Date and let the supplier propose the staged dispatch schedule.
- Inco term — for marine refit work, FOB China port is most common because the buyer typically has freight forwarder agreements already in place. CIF is acceptable but adds 8–12% to the line cost.
- Inspection clause — third-party inspection (SGS, BV, Lloyd's) at the factory before despatch is standard for orders above USD 50,000. The cost is borne by the supplier; the inspection report is required for L/C release.
- Warranty period — 12 months from commissioning is standard. Some Chinese suppliers offer 18 months on remanufactured units; in that case, ask what failure mode is covered. "Manufacturing defects only" is a narrower warranty than "premature wear under rated duty cycle."
- Class certification — MacGregor cranes installed on classed vessels (DNV, BV, Lloyd's, ABS, KR, NK) may require that replacement parts also carry class approval. Confirm with the vessel's class society before specifying class-approved parts; otherwise the supplier's cost goes up by 15–25% unnecessarily.
Marine sourcing logistics: Norway → China → Norway
For a Norwegian buyer ordering from China, the typical logistics flow is:
Because Norwegian dry-dock windows are typically 4–6 weeks long and bookings happen 6–12 months in advance, missing the despatch date by even one week can mean missing the dock window entirely and re-scheduling the refit by 6 months. This is why marine procurement teams favour suppliers with a documented track record of on-time despatch over suppliers with the lowest quoted price. Cheap parts that arrive two weeks late cost the shipowner roughly USD 200,000 in lost charter revenue, which is more than the entire BOM was worth.
- Factory inspection at Ningbo / Qingdao (depending on the supplier's location). Lead time: 5–10 days from the supplier announcing readiness.
- Sea freight from a Chinese port (most pump suppliers use Ningbo or Shanghai) to Rotterdam, Hamburg, or Gdansk, then inland trucking to the Norwegian yard. Sea transit is 28–35 days.
- Norwegian customs clearance for refit parts is generally straightforward when the parts are itemised on the commercial invoice with HS codes 8412 (motor / pump) and 8413 (pump components). VAT and duty depend on whether the vessel is registered for ocean-going service.
- Yard delivery coordinated with the dry-dock window. Most Norwegian crane refit work happens at a fixed dock window, so the supplier's commitment to a despatch date matters more than transit time itself.
Closing thought
The Norwegian buyer who sent us this BOM was not asking for a catalogue. They were asking, implicitly, which Chinese supplier on your network actually understands marine hydraulic refurbishment, has the test equipment, and won't ghost when the pump fails on first installation?
That's the question this article exists to answer — by walking through the BOM, the failure modes, and the verification steps that separate a real remanufacturer from a trader. If you're working on a similar refit and want to skip directly to a shortlist, the supplier card above is where to start.
Specific Honeywell part numbers, third-party inspection requirement, distributor-tier pricing.
Brazilian HVAC distributor multi-line BOM. Schrader valves, forged nuts, filter components.
Qatari aftermarket distributor full chassis-and-suspension request. OEM vs aftermarket grading.
Source & redaction: The buyer inquiry summarised in this article was received through our sourcing channels and has been redacted to remove all personal, vessel, and counterparty information. Quantities, products, geographies, and inquiry timing are preserved.
Industry information: Statements about MacGregor crane components, hydraulic pump testing, OEM lineages, and marine logistics reflect general industry practice and may not apply to every specific crane model, vessel type, or jurisdiction. Buyers should consult the vessel's class society and the equipment OEM for specific compliance requirements.
Supplier capability: Information about SEIMT Hydraulics and the cross-linked supplier profiles was summarised from publicly available content on each supplier's website. CifyChina does not guarantee the correctness, completeness, or current validity of any product, pricing, or capability claim. Verify all specifications and certifications directly with the supplier before transacting.
No middleman role: CifyChina provides supplier discovery and editorial content. Buyers are encouraged to work with suppliers directly through the contact channels published on each supplier's official website.
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