OEM 3966840 Cummins Lubricating Oil Pump for Non Certified 10 liter L10 engines Factory, Exporters

1 / 1

OEM 3966840 Cummins Lubricating Oil Pump for Non Certified 10 liter L10 engines Factory, Exporters

3966840 is a dedicated replacement lubricating oil pump developed specifically for Cummins non-certified 10-liter L10 series engines. As the core power component of the engine lubrication system, its rotor-type high-efficiency oil pumping structure and enhanced durability design precisely meet the demanding operational requirements of this engine model in heavy-duty equipment. Field-tested under real-world conditions, this product effectively resolves lubrication failures in dusty, high-load environments, ensuring stable oil pressure for continuous equipment operation. It is commonly used in agricultural machinery, construction equipment, mining machinery, and power generation equipment.

Send Inquiry

Product Description

3966840 Lubricating Oil Pump Replacement Part. Manufactured from high-hardness alloy in a single-piece construction, it integrates three core functions: "High-Efficiency Oil Pumping - Pressure Regulation - Sealing Protection".

It achieves stable oil supply through eccentric meshing technology between inner and outer rotors. Combined with a non-adjustable relief valve and independent return oil channel design, it not only meets the stringent lubrication pressure requirements of Cummins L10 engines but also significantly reduces component wear and seal failure risks. The structure fully complies with OEM specifications for direct replacement.

SPECIFICATIONS

Part Name	Cummins Lubricating Oil Pump	Part Number	3966840
Pump Type	Rotor type lubrication pump	Interchange Part	3991123, 4941464, 4983588, 3948072
Car Model	Diesel Engine	Refer Number	091800C60001
Product Type	Oil Pump	Pressure Regulation	Non-adjustable relief valve
Operating Temp	-30℃ to 120℃	Quality	OEM standard
Compatible Engine	Non Certified 10 liter L10 engines (6C8.3, G8.3, ISBE4, ISC8.3, ISL9, QSB6.7, QSC8.3, etc.)

KEY FEATURES

⚡

High Efficiency

Optimized oil inlet chamber volume ratio improves pumping efficiency by 8%-12%. Stable pressure maintained across all engine speeds (10 psi idle to 55 psi rated).

🛡️

Durable Construction

High-hardness alloy rotor offers 40% improved wear resistance. Independent return oil channel extends oil seal lifespan by over 30%.

🔧

Plug-and-Play

1:1 replication of OEM mounting dimensions. Perfectly aligned bolt holes and locating pins for direct replacement without modification.

🌍

Extreme Adaptability

IP65 dust-proof sealing with wide-temperature range materials. Reliable performance from -30°C cold starts to 120°C operating heat.

APPLICATIONS & MODELS

Industrial Sectors:

Agricultural: Large tractors and harvesters.
Construction: Loaders, excavators, and road rollers.
Power: Stationary power stations and emergency sets.
Mining: Heavy transport and port machinery.

Kit Inclusions:

Part number 3966840 is frequently included in the 5469661 Long block kit and supports a wide range of G-series and IS-series engines including ISL9 CM2350 and QSC8.3.

FREQUENTLY ASKED QUESTIONS

1. Is this oil pump compatible with all Cummins L10 engines?

It is only compatible with non-certified 10-liter L10 series diesel engines, supporting both mechanical injection and early electronic control models. It is not suitable for factory-certified L10 engines or other displacement models like the 6BT or ISX series.

2. Can it be used for construction machinery or power generation?

Yes. This product is compatible with loaders, excavators, stationary power stations, and other equipment equipped with non-certified L10 engines. Its IP65 dust-proof design is ideal for harsh construction environments.

3. What should I do if the pump fails to supply oil during the first start-up?

This is common post-installation. Remove the oil filter or outlet pipe and fill the engine through the filler hole using an oil injector. Reinstall components and start the engine to establish pressure.

4. What are the critical details for a successful installation?

Ensure bolts are tightened to factory torque (25-30 N·m) to prevent deformation, verify alignment pins are seated to prevent rotor seizure, and clean the inlet filter screen thoroughly before mounting.

5. How do I determine if the oil pump needs replacement?

Replacement is required if oil pressure stays below 30 psi, abnormal noise is detected, rotor end clearance exceeds 0.10 mm, or if the unit has exceeded 3,000 operating hours.

6. Does the type of engine oil affect the pump's lifespan?

Significantly. We recommend oil meeting Cummins CES 20081 standards. For agricultural machinery, use 15W-40 fully synthetic oil. Avoid mineral oil as it can accelerate rotor wear.

Product Detail

OEM 3966840 Cummins Lubricating Oil Pump for Non Certified 10 liter L10 engines Factory, Exporters

Product Description

SPECIFICATIONS