Multiquip 8972315170 Plunger Assembly Injection Pump DCA-45USJ 4JG1

The Multiquip 8972315170 is a genuine OEM Plunger Assembly Injection Pump DCA-45USJ 4JG1 designed for the DCA-45USJ ultra-silent generator. As a direct OEM replacement, this assembly is sourced from Multiquip's authorized supply chain to ensure the correct specification for the 4JG1 engine platform. Verified fitment for the DCA-45USJ means you can order with confidence knowing this is the right part for your machine. DHS Equipment stocks genuine Multiquip OEM parts so your generator gets back to work without compromise.

Key Features

• Genuine OEM Injection Precision — Manufactured to the exact tolerances required for consistent fuel metering in the 4JG1 diesel engine, maintaining correct injection timing and delivery volume.
• Direct-Fit Assembly — Engineered as a drop-in replacement for the injection pump on the DCA-45USJ, matching the original plunger geometry and barrel interface for straightforward installation.
• Confirmed DCA-45USJ Fitment — Specifically referenced for the Multiquip DCA-45USJ ultra-silent generator series powered by the Isuzu 4JG1 engine.
• Sustained Generator Output — A properly functioning injection plunger assembly keeps fuel delivery consistent, protecting rated power output and load-handling capacity under continuous operation.
• Fuel System Integrity — Worn or damaged injection plunger components can cause hard starting, rough running, or uncontrolled fuel leakage — replacing with a genuine OEM assembly restores proper sealed operation within the high-pressure fuel circuit.

The injection pump plunger assembly is a precision component inside the high-pressure fuel injection pump of a diesel engine. It works by pressurizing fuel to the high levels needed to inject it directly into the combustion chamber at exactly the right moment in the engine cycle. When the plunger wears or becomes damaged, fuel delivery becomes inconsistent, leading to loss of power, rough idling, excessive smoke, or the engine failing to start altogether. Replacing this assembly with the correct OEM part restores the tight tolerances the 4JG1 injection pump depends on for accurate, reliable fuel delivery.

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.