Multiquip 4090031 Water Pump Kit QST30-G5 Cummins

The Multiquip 4090031 is a genuine OEM Water Pump Kit QST30-G5 Cummins designed for the QST30-G5 generator. As a direct OEM replacement, this kit is sourced and validated for the QST30-G5 platform, giving you the confidence that every component in the kit meets the original build specification. This part is available through DHS Equipment, your authorized source for Multiquip OEM replacement parts.

Key Features

• Genuine OEM Construction — Each component in this water pump kit is manufactured to the exact tolerances required by the Cummins QST30-G5 engine, ensuring proper sealing, flow rate, and pressure output.
• Complete Kit Format — Supplied as a full kit so all necessary components are replaced together, eliminating the guesswork of sourcing individual pieces for a water pump service.
• Confirmed QST30-G5 Fitment — Engineered specifically for the Multiquip QST30-G5 Cummins-powered generator, ensuring correct bolt pattern, port sizing, and mounting alignment.
• Sustained Cooling System Integrity — A properly functioning water pump maintains coolant circulation throughout the engine. A worn or failing pump risks overheating, which can lead to engine damage and unplanned service events on critical generator applications.
• Fuel System and Engine Safety — On high-output Cummins engines like the QST30-G5, maintaining the cooling circuit is essential to safe continuous operation — making timely water pump replacement a key part of scheduled engine maintenance.

The water pump is responsible for circulating coolant through the engine block and cooling system, regulating operating temperature under load. On a high-capacity engine like the Cummins QST30-G5, consistent coolant flow is critical to sustaining output and preventing thermal stress on internal components. When the water pump begins to fail — through seal wear, bearing degradation, or impeller damage — coolant circulation drops, temperatures rise, and the engine becomes vulnerable to serious damage if not addressed promptly.

For questions about fitment or to confirm this is the correct part for your QST30-G5 unit, contact the DHS Equipment team directly.

Part Details

Compatibility & Fitment

Verify Before You Order

Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.

Why Buy From DHS Equipment

Every part is verified against the manufacturer's part number before it ships, so what you order is what arrives. We carry parts from leading OEM brands and our own DHS Quality Parts line of professional aftermarket components. Need help finding the right part? Our team is available to confirm compatibility whenever you need it. Orders are processed fast to keep your jobs on track. We don't just sell parts. We keep you jobsite ready.

Questions? Contact our team at [email protected] or 866-611-9369 — DHS Equipment is here to help you maintain peak performance.