Cummins Diesel Generator Parts — OEM & Aftermarket Spare Parts Supplier

Key Takeaways

– Genuine OEM & High-Quality Aftermarket Cummins generator parts covering 4BT, 6BT, 6CT, 6CTA, NT855, K19, K38, K50, QSK60, QSK78, and QST30 engine series.
– 15+ years of experience supplying Cummins diesel generator spare parts to power plants, mining operations, and data centers across 60+ countries.
– 24-month warranty on all Cummins parts, with ISO 9001:2015 certified quality control and factory-direct pricing. RFQ response within 24 hours.

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Brand Overview & Engine Series

Cummins Inc. is one of the world’s largest diesel engine manufacturers, powering generator sets from 20 kVA to 3,500+ kVA. The Cummins generator engine lineup spans multiple series, each with distinct part families and maintenance requirements. Huaquan has maintained a strategic partnership with Cummins-authorized distributors since 2012, ensuring access to genuine OEM parts and certified aftermarket alternatives.

Cummins Diesel Generator Engine Series

| Engine Series | Cylinders | Power Range (kVA) | Common Applications | Key Part Categories |
|————–|———–|———————|———————|———————|
| 4BT3.9 | 4 Inline | 20–50 | Small standby, telecom | Pistons, liners, gaskets, filters |
| 6BT5.9 | 6 Inline | 50–120 | Commercial, residential backup | Fuel pumps, injectors, water pumps |
| 6CT8.3 | 6 Inline | 120–200 | Industrial, construction | Turbochargers, cylinder heads, oil pumps |
| 6CTA8.3 | 6 Inline | 150–250 | Marine auxiliary, prime power | Aftercoolers, heat exchangers |
| NT855 | 6 Inline | 200–400 | Industrial prime, standby | Main bearings, connecting rods, camshafts |
| K19 | 6 Inline | 400–600 | Mining, heavy industrial | Pistons, cylinder liners, crankshafts |
| K38 | V12 | 600–1,000 | Large industrial, utilities | Turbocharger assemblies, oil coolers |
| K50 | V16 | 1,000–1,600 | Power plants, offshore | Complete overhaul kits, valve trains |
| QSK60 | V16 | 1,500–2,500 | Critical power, data centers | Electronic control modules, fuel system |
| QSK78 | V18 | 2,000–3,500 | Utility-scale power generation | High-pressure fuel pumps, actuators |

Generator Model Compatibility

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OEM Part Numbers & Cross Reference for Cummins Generator Parts

Below is a comprehensive list of high-demand Cummins generator spare parts with OEM part numbers, compatible engine models, cross-reference equivalents, and technical specifications.

| # | Part Name | Cummins OEM No. | Engine Model | Cross Reference (Fleetguard) | Technical Specifications |
|—|———–|—————-|————-|——————————|————————–|
| 1 | Oil Filter | LF3349 | 4BT3.9, 6BT5.9 | Fleetguard LF3349 | Full-flow, cellulose media, 20 micron, OD 93mm |
| 2 | Oil Filter | LF9009 | 6CT8.3, 6CTA8.3 | Fleetguard LF9009 | High-efficiency, 15 micron, spin-on |
| 3 | Oil Filter | LF670 | NT855, K19 | Fleetguard LF670 | Heavy-duty, bypass valve, 25 micron |
| 4 | Oil Filter | LF14000NN | K38, K50 | Fleetguard LF14000NN | Large capacity, 30 micron |
| 5 | Fuel Filter | FF5052 | 4BT3.9, 6BT5.9 | Fleetguard FF5052 | 10 micron, water separator integrated |
| 6 | Fuel Filter | FF5488 | 6CT8.3, 6CTA8.3 | Fleetguard FF5488 | Spin-on, 7 micron filtration |
| 7 | Fuel Filter | FF202 | NT855, K19 | Fleetguard FF202 | Primary fuel, water separation |
| 8 | Fuel Filter | FF105 | NT855, K19 | Fleetguard FF105 | Secondary fuel, 5 micron |
| 9 | Fuel Water Separator | FS1280 | 4BT, 6BT, 6CT | Fleetguard FS1280 | 150 micron pre-filter, drain valve |
| 10 | Air Filter | AF872 | 4BT3.9 | Fleetguard AF872 | Dry type, radial seal, 99.9% efficiency |
| 11 | Air Filter | AF879 | 6BT5.9, 6CT8.3 | Fleetguard AF879 | Heavy-duty, radial seal |
| 12 | Air Filter | AF25278 | K19, K38, K50 | Fleetguard AF25278 | Safety element included |
| 13 | Cylinder Liner | 3800757 | 4BT3.9 | — | Wet-type, induction hardened, 102mm bore |
| 14 | Cylinder Liner | 3904166 | 6BT5.9 | — | Wet-type, 102mm bore, plateau honed |
| 15 | Cylinder Liner | 3055099 | NT855 | — | Wet-type, 140mm bore |
| 16 | Piston Kit | 3800752 | 4BT3.9 | — | Aluminum alloy, 3-ring, with pin & clips |
| 17 | Piston Kit | 3802408 | 6BT5.9 | — | Articulated piston, 102mm, 17.5:1 CR |
| 18 | Piston Kit | 3018767 | NT855 | — | Steel crown + aluminum skirt, 140mm |
| 19 | Main Bearing Set | 3801299 | 4BT3.9 | — | Tri-metal, standard size |
| 20 | Main Bearing Set | 3900901 | 6BT5.9 | — | Tri-metal, 0.25mm undersize available |
| 21 | Main Bearing Set | AR12270 | NT855 | — | Copper-lead, standard |
| 22 | Connecting Rod Bearing | 3801263 | 4BT3.9 | — | Tri-metal, standard |
| 23 | Connecting Rod Bearing | 3901172 | 6BT5.9 | — | Tri-metal |
| 24 | Cylinder Head Gasket | 3921394 | 6BT5.9 | — | MLS (Multi-Layer Steel), 1.45mm |
| 25 | Cylinder Head Gasket | 3016769 | NT855 | — | Graphite composite, 1.8mm |
| 26 | Turbocharger | 3536982 (HX35) | 6BT5.9 | Holset HX35W | Wastegated, max boost 22 psi |
| 27 | Turbocharger | 3524209 (HX40) | 6CT8.3 | Holset HX40W | Free-float, 28 psi |
| 28 | Turbocharger | 3800501 (HX55) | NT855 | Holset HX55 | Twin-entry, water-cooled center housing |
| 29 | Water Pump | 3800647 | 4BT3.9 | — | Centrifugal, 80 L/min @ 2500 RPM |
| 30 | Water Pump | 3913031 | 6BT5.9 | — | Centrifugal, 180 L/min |
| 31 | Water Pump | 3046854 | NT855 | — | Gear-driven, 380 L/min |
| 32 | Fuel Injector | 3802317 | 6BT5.9 | Bosch 0 432 193 127 | 5-hole nozzle, 260 bar opening |
| 33 | Fuel Injector | 3076132 | NT855 | — | PT-type injector, STC |
| 34 | Oil Pump | 3907849 | 6BT5.9 | — | Gear-type, 60 PSI regulated |
| 35 | Oil Pump | 3037870 | NT855 | — | Gear-type, 55–75 PSI |
| 36 | Thermostat | 3934397 | 6BT5.9 | — | 82°C opening, 95°C full open |
| 37 | Thermostat | 3010401 | NT855 | — | 83°C, high-flow |
| 38 | Fan Belt | 3911575 | 6BT5.9 | Gates 9380 | V-ribbed, 8PK, 1740mm |
| 39 | Overhaul Kit | 3800557 | 4BT3.9 | — | Complete gasket set, seals, O-rings |
| 40 | Overhaul Kit | 3800558 | 6BT5.9 | — | Upper + lower gasket sets |
| 41 | Starter Motor | 3935379 | 6BT5.9 | Delco 10461457 | 12V, 4.0 kW, 11-tooth pinion |
| 42 | Alternator | 3918453 | 6BT5.9 | — | 24V, 70A, pad mount |

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Engine-Generator Compatibility Matrix

| Engine Model | Displacement (L) | Bore × Stroke (mm) | Compression Ratio | Rated RPM | Generator Output (kVA) | Fuel Consumption (L/hr @ 75%) |
|————-|——————|———————|——————-|———–|———————-|——————————-|
| 4BT3.9-G2 | 3.9 | 102 × 120 | 17.5:1 | 1500/1800 | 20–36 | 5.4 |
| 6BT5.9-G2 | 5.9 | 102 × 120 | 17.5:1 | 1500/1800 | 50–75 | 9.6 |
| 6CT8.3-G2 | 8.3 | 114 × 135 | 16.5:1 | 1500/1800 | 80–120 | 16.5 |
| 6CTA8.3-G2 | 8.3 | 114 × 135 | 16.5:1 | 1500/1800 | 125–175 | 19.8 |
| NT855-GA | 14.0 | 140 × 152 | 14.5:1 | 1500/1800 | 200–350 | 38.5 |
| KTA19-G2 | 19.0 | 159 × 159 | 13.9:1 | 1500/1800 | 350–560 | 59.0 |
| KTA38-G2 | 38.0 | 159 × 159 | 13.9:1 | 1500 | 700–1,000 | 116.0 |
| KTA50-G3 | 50.0 | 159 × 159 | 14.0:1 | 1500 | 1,100–1,600 | 174.0 |
| QSK60-G | 60.0 | 159 × 190 | 15.0:1 | 1500 | 1,800–2,500 | 225.0 |

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OEM vs Aftermarket Parts for Cummins Generators

Choosing between OEM and aftermarket parts for your Cummins generator requires balancing performance, cost, and warranty considerations.

Our Recommendation

For critical standby generators (hospitals, data centers, emergency systems), we recommend OEM parts for fuel system and electronic components. For routine maintenance items (filters, belts, gaskets, hoses) and non-critical engine components (water pumps, oil pumps, radiators), our ISO-certified aftermarket parts deliver OEM-equivalent performance at 40–60% lower cost. All parts are backed by our 24-month warranty.

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Case Study: 3.5 MW Cummins QSK60-G Power Plant Overhaul — Indonesia Mining Site

Client: PT Mining Resources Indonesia, East Kalimantan
Project: Complete overhaul of 2 × Cummins QSK60-G generator sets (3,500 kW total)
Timeline: Q2 2023
Challenge: The mining site operates 24/7 in a remote jungle location with ambient temperatures exceeding 38°C and humidity above 85%. Both QSK60 generator sets had accumulated over 18,000 operating hours without major overhaul. Oil analysis showed elevated metal wear particles (iron at 85 ppm, copper at 42 ppm). Both units experienced frequent overheating trips and one unit had developed turbocharger surge at loads above 70%. The site could not afford more than 14 days of downtime per unit.

Solution: Huaquan dispatched a senior engineer to the site for inspection within 5 days of receiving the inquiry. We identified the following issues: (a) cylinder liners in cylinders 5, 7, 11, and 14 showed excessive bore polishing and ovality >0.08mm; (b) both HX83 turbochargers had worn turbine shaft bearings causing surge; (c) fuel injectors on the B-bank showed 12% flow deviation; (d) the cooling system had scale buildup reducing heat transfer efficiency by approximately 30%.

We supplied a complete overhaul package: 16 cylinder liner kits (part # 4376215), 16 piston assemblies (# 4376122), 2 × HX83 turbocharger cartridges (# 4089964), 16 fuel injectors (# 4089968), full upper and lower gasket kits (# 4376431), water pump rebuild kit (# 4376204), and thermostat assembly (# 4089993). All parts were shipped via air freight (DHL) and arrived on-site within 6 days of order confirmation.

Result: Overhaul completed in 11 days per unit (within the 14-day target). Post-overhaul testing showed both units delivering 100% rated load at 40°C ambient with exhaust temperatures within Cummins spec. Oil analysis after 500 hours showed wear metals returning to normal levels (iron <15 ppm). The client reported fuel consumption improvement of approximately 4.5% and saved an estimated $120,000 compared to OEM dealer pricing. PT Mining Resources Indonesia has since signed a 3-year spare parts supply agreement with Huaquan for their fleet of 8 Cummins generator sets.

Key Takeaway: For remote sites with aging Cummins equipment, having a reliable aftermarket parts supplier with technical field support capability is as important as parts pricing. Huaquan’s combination of OEM-spec parts and field engineering support enabled this project to succeed under extreme conditions.

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Maintenance Checklist for Cummins Diesel Generators

Use this maintenance checklist to extend the service life of your Cummins generator and reduce unplanned downtime.

Daily / Weekly (Operator Level)

– [ ] Check engine oil level (dipstick, add if below “Add” mark)
– [ ] Check coolant level in expansion tank (top up with Cummins-approved coolant)
– [ ] Inspect fuel water separator (drain water from FS1280/FS1000 bowl)
– [ ] Check for visible leaks (oil, coolant, fuel, exhaust)
– [ ] Inspect air filter restriction indicator (replace if red)
– [ ] Verify battery voltage (should be >12.4V for 12V systems)
– [ ] Run generator under load for minimum 30 minutes weekly
– [ ] Record all gauge readings (oil pressure, coolant temp, voltage, frequency)

Every 250 Hours / Monthly

– [ ] Change engine oil and oil filter (LF3349 / LF9009)
– [ ] Replace fuel filter (FF5052 / FF5488) and clean water separator
– [ ] Inspect fan belt tension and condition (replace if cracked or glazed)
– [ ] Clean radiator fins and check for debris blockage
– [ ] Test coolant SCA (Supplemental Coolant Additive) levels
– [ ] Inspect battery terminals for corrosion, clean and tighten
– [ ] Check alternator belt tension
– [ ] Test safety shutdown systems (low oil pressure, high coolant temp)

Every 500 Hours / Quarterly

– [ ] Replace air filter element (AF872 / AF879)
– [ ] Inspect turbocharger for shaft play and oil leaks
– [ ] Check valve clearances (cold engine: intake 0.25mm, exhaust 0.50mm for 6BT)
– [ ] Test fuel injector spray pattern and pop pressure (260 bar for 6BT)
– [ ] Flush and replace engine coolant (every 2 years or 2,000 hours)
– [ ] Inspect engine mounts and vibration dampers
– [ ] Clean crankcase breather
– [ ] Calibrate engine sensors (oil pressure, coolant temp, speed)

Every 2,000 Hours / Annual

– [ ] Complete fuel system inspection (injectors, fuel pump calibration)
– [ ] Turbocharger overhaul or replacement (bearings, seals)
– [ ] Cylinder compression test (minimum 350 PSI for 6BT)
– [ ] Replace thermostat (3934397)
– [ ] Inspect starter motor and alternator (brush wear, bearing condition)
– [ ] Perform oil analysis (spectrographic) to monitor wear trends
– [ ] Full load bank test (minimum 4 hours at 100% rated load)

Every 10,000 Hours / Major Overhaul

– [ ] Replace cylinder liners, pistons, piston rings
– [ ] Replace main bearings and connecting rod bearings
– [ ] Replace or regrind crankshaft
– [ ] Cylinder head overhaul (valve guides, seats, seals)
– [ ] Replace camshaft and cam followers
– [ ] Complete gasket and seal replacement

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Why Huaquan for Cummins Generator Parts

Factory Experience & Partnership

Huaquan has been supplying Cummins-compatible generator parts since 2012. Our 20,000 m² manufacturing facility in Shandong, China houses dedicated production lines for Cummins-compatible cylinder liners, pistons, gaskets, and filter elements. We maintain cooperative agreements with three Cummins-authorized distribution channels, giving us priority access to genuine OEM parts for urgent orders. Over the past decade, we have fulfilled more than 4,500 Cummins parts orders across Southeast Asia, Africa, the Middle East, and South America.

Quality Control Process

Every Cummins-compatible part produced by Huaquan undergoes a four-stage quality inspection:

1. Incoming Material Inspection: Spectrometer analysis verifies alloy composition of raw materials (cast iron, aluminum, bearing metals)
2. In-Process Inspection: CMM (Coordinate Measuring Machine) checks dimensional accuracy at critical production stages; tolerances maintained within 0.01mm for bearing journals and cylinder bores
3. Assembly & Fitment Test: Random sample parts are installed on reference Cummins engines and run for minimum 50 hours under load
4. Final QC & Packaging: 100% visual inspection, rust-preventive coating, vacuum-sealed packaging with QR-coded traceability labels

Industry Certifications

– ISO 9001:2015 — Quality Management System (Certified by SGS)
– ISO 8528 — Generator Set Performance Standards compliance
– CE Marking — European conformity for all electrical components
– ISO 14001:2015 — Environmental Management certification in progress

Global Logistics

– Air Freight: DHL / FedEx / UPS — 3–7 days delivery worldwide, ideal for urgent overhaul parts
– Sea Freight: FCL (Full Container Load) or LCL (Less than Container Load) — 15–35 days, cost-effective for bulk orders
– Packaging: Wooden crates with fumigation certificates for heavy components (turbochargers, cylinder heads); reinforced cartons with foam inserts for filters and gaskets; custom branded packaging available for distributors
– MOQ: 1 piece for sample orders; competitive tier pricing for bulk (50+, 200+, 500+ pieces)

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Frequently Asked Questions

1. What is the difference between Cummins 4BT and 6BT engine parts?

The 4BT is a 4-cylinder 3.9L engine, while the 6BT is a 6-cylinder 5.9L engine. Many parts (pistons, liners, injectors, connecting rods) are identical because they share the same bore and stroke. However, parts unique to each include the crankshaft, camshaft, and intake/exhaust manifolds. The 4BT uses oil filter LF3349 and the 6BT also uses LF3349. Both use fuel filter FF5052.

2. How often should I replace the fuel filter on a Cummins generator?

Fuel filters (FF5052, FF5488, FF202, FF105) should be replaced every 250 operating hours or every 6 months, whichever comes first. In dusty environments or when using lower-quality diesel fuel, replace every 125–150 hours. Always drain the fuel water separator (FS1280) daily.

3. Can I use aftermarket parts on a Cummins generator under warranty?

Using aftermarket parts does not automatically void your Cummins warranty under the Magnuson-Moss Warranty Act (USA) and similar regulations. However, if an aftermarket part causes a failure, that specific failure may not be covered. Huaquan aftermarket parts are manufactured to meet or exceed OEM specifications and carry their own 24-month warranty.

4. What is the typical lifespan of a Cummins QSK60 generator before overhaul?

The QSK60 is rated for 20,000–25,000 hours between major overhauls under proper maintenance. Key factors affecting lifespan: load factor (75–85% is optimal), fuel quality (use ASTM D975 No. 2 diesel), coolant maintenance (SCA levels every 250 hours), and oil change intervals (every 250 hours with CJ-4 15W-40).

5. How do I identify the correct Cummins part number for my generator?

Find the engine data plate (typically on the left side of the engine block or on the valve cover). The data plate lists the Engine Serial Number (ESN) and CPL (Critical Parts List) number. Use these to cross-reference in the Cummins QuickServe Online (QSOL) system, or send us the ESN and we will identify the correct parts in 24 hours.

6. What is the MOQ for Cummins parts from Huaquan?

Sample orders: 1 piece minimum. Regular orders: no strict MOQ, but competitive pricing begins at 50+ pieces for filters, 10+ pieces for pistons/liners, and 5+ pieces for turbochargers and cylinder heads. Distributor pricing available for annual purchase agreements.

7. Do you supply Cummins PT fuel system components?

Yes. We supply PT (Pressure-Time) fuel system components for Cummins NT855, K19, K38, and K50 engines, including: PT fuel pumps, PT injectors, fuel shutoff solenoids, AFC (Air Fuel Control) bellows, fuel lines, and fuel pressure regulators. These are available as genuine OEM or high-quality aftermarket options.

8. What are the most commonly replaced Cummins generator parts?

The top 10 most frequently ordered Cummins parts are: (1) LF3349/LF9009 oil filters, (2) FF5052/FF5488 fuel filters, (3) AF872/AF879 air filters, (4) FS1280 fuel water separators, (5) 3921394 cylinder head gaskets, (6) 3802317 fuel injectors, (7) 3913031 water pumps, (8) 3934397 thermostats, (9) 3536982 turbochargers, (10) 3801299 main bearing sets.

9. What is your warranty policy on Cummins parts?

All Huaquan-supplied parts carry a 24-month warranty from the date of shipment. OEM Cummins parts carry a 12-month manufacturer warranty. Claims require photographic evidence and a brief failure report. Replacement parts are shipped within 5 working days of claim approval.

10. How fast can you deliver Cummins parts to Africa / Middle East / Southeast Asia?

Air freight (DHL/FedEx): 3–7 days. Sea freight: 18–35 days depending on destination port. We maintain a warehouse in Qingdao with bonded logistics partners for expedited customs clearance to Africa and Southeast Asia.

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Get a Quote — Cummins Diesel Generator Parts

Need genuine or aftermarket Cummins generator parts? Huaquan delivers OEM-quality parts at competitive factory-direct prices with 24-month warranty and fast global shipping.

Why choose Huaquan for your Cummins parts supply:

– 15+ years of Cummins parts export experience
– 4,500+ orders fulfilled across 60+ countries
– ISO 9001:2015 certified manufacturing
– 24-month warranty on all parts
– DHL/FedEx air freight — delivery in 3–7 days worldwide
– Technical support in English, French, Spanish, and Arabic
– Low MOQ — 1 piece for sample orders

Contact us today for a quotation within 24 hours:

– Email: lb@hqdl.cn
– WhatsApp: +86-138-xxxx-xxxx
– Download Catalog: Cummins Parts Catalog (PDF)
– RFQ Form: Send us your Engine Serial Number (ESN) or part numbers for fastest quotation

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Cummins Diesel Generator Parts | OEM & Aftermarket Spare Parts Supplier