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5588790 Cummins Lubricating Oil Pump Replacement for Euro 6 3.8 liter ISF/QSF engines
5588790 Lubricating Oil Pump Replacement Part features a high-pressure rotor-type structure. The pump body is integrally die-cast from high-strength aluminum alloy, while the rotor and gears undergo precision grinding and surface hardening treatment, achieving both lightweight construction and high wear resistance. To meet the enhanced thermal management demands of Euro 6 engines and coordinate with aftertreatment systems, the oil flow path design and pressure regulation response mechanism have been optimized. This ensures stable operation across extreme temperatures from -30°C to 135°C, as well as in high-vibration and dusty environments. Each unit undergoes a 60-minute variable load cycle test prior to shipment to ensure flow and pressure parameters fully comply with OEM standards, eliminating any risk of oil ingress into the aftertreatment system.
| Part Name | Lubricating Oil Pump | Part Number | 5588790 |
| Drive Mode | Gear drive | Pump Type | Oil Pump |
| Engine Mode | Diesel Engine | Origin | China |
| Operating Temperature | -30℃-135℃ | Quality | OEM standard |
| Compatible Engine | Euro 6 3.8 liter ISF/QSF engines | Unit | Lubricating Oil Pump |
| Related Part Number | 5302892, 5267073，5525373 | ||
| Compatible Engine Mode |
B4.5 CM2220 B186B, ISB4.5 CM2350 B104 |
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| Application |
Commercial Vehicle Sector: Compatible with light-duty and medium-duty trucks equipped with ISF3.8 engines, such as Foton Aulion and JAC Shuai Ling, meeting the demands of frequent start-stop cycles and extended operation in urban delivery and long-haul transportation scenarios. Validated through 800,000 kilometers of operation without major repairs. Construction Machinery Sector: Serves small excavators, loaders, and forklifts (equipped with QSF3.8 engines) from brands like Sany Heavy Industry and XCMG. Designed for urban infrastructure and warehousing logistics, it meets low-noise and low-emission requirements while withstanding dusty, high-frequency operation in demanding conditions. Specialized Equipment Sector: Meets Euro 6 standards for sanitation vehicles, cold chain logistics trucks, and emergency rescue vehicles. Provides stable lubrication for intermittent high-load and low-temperature refrigeration operations, ensuring continuous compliance of aftertreatment systems. Stationary Power Applications: Designed for QSF3.8 engines in stationary generators and pump stations, it employs precise pressure control during continuous operation to reduce shutdowns caused by insufficient lubrication, ensuring stable power/water supply. |
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- Euro 6-Specific Compatibility: Deeply matched to the 3.8-liter ISF/QSF engine's Euro 6 emissions system, it optimizes lubricating oil injection pressure and flow curves to prevent oil leakage from affecting DPF regeneration efficiency and SCR catalytic conversion effectiveness. This ensures 100% compliance with emissions testing standards without triggering engine fault codes.
- Lightweight and High-Strength Design: The aluminum alloy pump body reduces weight by 30% compared to traditional cast iron pumps, lowering overall engine load. Its superior thermal conductivity rapidly dissipates heat, preventing oil degradation under high-temperature conditions. Paired with a hardened alloy steel rotor, it achieves a 50% longer service life than standard pumps.
- Precision Lubrication and Energy Efficiency: Optimized rotor profiles and low-friction design reduce operational power consumption by 10% compared to previous generations, improving engine fuel economy by 2%-3%. Maintains a minimum operating pressure of 1.8 bar even at idle, preventing dry friction wear on critical components during cold starts.
- Convenient Maintenance & High Compatibility: Fully compatible with OEM installation procedures, requiring no specialized tools. Skilled technicians at standard repair shops can complete assembly within 1.5 hours. Seamlessly compatible with Cummins Euro 6-specific oil and OEM filters, reducing maintenance costs by 30%-40% compared to OEM parts. Supports 72-hour emergency replenishment.
| Models containing the spare part 5588790 Lubricating oil pump | |
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| Units containing the spare part 5588790 Lubricating oil pump | |
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1. Is the 5588790 oil pump exclusively compatible with Euro 6-compliant ISF/QSF 3.8L engines? Can it be used with models meeting other emission standards?
Core compatibility is with Euro 6-compliant ISF3.8 and QSF3.8 series engines (e.g., ISF3.8s5154, QSF3.8s5160), and is incompatible with Euro 5 or earlier models. It does not match the lubrication system parameters of non-3.8-liter ISF/QSF engines and cannot be used as a cross-displacement replacement.
2. Does this replacement part differ in performance from the Cummins genuine 5588790 oil pump?
Performance is identical. Core parameters (flow rate, pressure, materials) are identical to the genuine part and validated for Euro 6 emissions compliance.
3. How can I quickly determine if an engine requires this oil pump replacement?
The following conditions indicate replacement is needed: ① Oil pressure below 1.8 bar (idle) or above 4.5 bar (full load), with fluctuations exceeding 0.2 bar; ② Abnormal meshing noise in the pump area, worsening with increasing RPM; ③ Oil leakage, rapid oil degradation, or aftertreatment system fault codes (e.g., DPF regeneration failure).
4. Does installing this oil pump require specialized tools or modifications? Can a standard repair shop perform the installation?
No specialized tools are needed—standard socket wrenches and torque wrenches suffice. It features 1:1 matching with OEM mounting holes, sealing interfaces, and locating pins, requiring no modifications. A skilled technician at a standard repair shop can complete assembly within 1.5 hours.
5. What post-installation adjustments are required to ensure Euro 6 emissions compliance?
Three core steps: ① Idle for 5 minutes until oil pressure stabilizes at 1.8-2.2 bar; ② Accelerate to rated RPM, maintaining pressure at 3.0-4.5 bar with fluctuations ≤0.2 bar; ③ Shut down and let idle for 30 minutes. Inspect pump body and interfaces for leaks to prevent oil ingress into the DPF/SCR system, which could compromise emissions compliance.
6. What installation details should be noted to avoid affecting Euro 6 emissions compliance?
① Use only OEM gaskets to prevent oil leaks interfering with the aftertreatment system.
② Tighten bolts to standard torque (refer to OEM specifications) to prevent vibration-induced pressure abnormalities.
③ Strictly align oil passages with the pump body's “IN (inlet)/OUT (outlet)” markings; reverse installation will cause lubrication failure.
7. What are the possible causes and solutions for low oil pressure during operation?
① Inappropriate oil viscosity or low oil level: Top up with Cummins Euro 6-specific engine oil, ensuring the level is within the standard range.
② Clogged inlet filter screen: Remove, clean, or replace the filter screen. ③ Rotor/gear wear (clearance exceeds 0.02mm): Disassemble pump housing and replace with hardened alloy steel rotors/gears; ④ Pressure regulator valve sticking: Clean valve core and apply specialized grease to restore adjustment flexibility.
8. What could cause abnormal noise from the pump housing? How to address it?
① Mechanical failure: Foreign objects trapped between gears or bearing wear. Disassemble pump to remove debris and replace worn bearings. ② Installation issues: Loose bolts (retighten to manufacturer's specified torque) or misaligned gaskets (replace gasket and reassemble). ③ Abnormal oil viscosity: Replace with Euro 6-compliant oil to prevent gear mesh noise caused by insufficient viscosity.