JCB QLS Head Unit : OEM 320/D9238

Smooth DEF Integration: JCB QLS Head Unit – OEM 320/D9238

What is it?
The JCB QLS Head Unit (OEM 320/D9238) is the central component of the DEF (Selective Catalytic Reduction) system, managing fluid dosing and monitoring in JCB machines equipped with Cummins QLS engines. It ensures accurate DEF delivery while sensors keep tabs on fluid level, pressure, and temperature to maintain optimal system responsiveness.

Why choose this OEM Head Unit?
This unit is designed to seamlessly align with JCB’s factory wiring and engine controls—no adjustments or calibration needed. Opting for it helps avoid inconsistent DEF flow, warning alerts, or unwanted performance restrictions that aftermarket units may cause.

Key Benefits
✅ Drop-in OEM replacement for JCB QLS systems (Cummins QLS engines)
✅ Helps maintain consistent DEF flow for dependable system function
✅ Onboard sensors actively track fluid level, pressure, and temperature
✅ Built to withstand vibration, temperature fluctuations, and harsh working environments
✅ Helps reduce warning alerts and prevent control system derates

Applications
Ideal for JCB backhoes, loaders, and excavators powered by Cummins QLS engines that use DEF for selective reduction. Ensures smooth SCR operation during both heavy-duty tasks and idle periods.

Installation Notes
Make sure to disconnect power and depressurize the DEF system before proceeding. Remove the existing head unit while keeping wiring and connections clean. Install the OEM 320/D9238 unit using factory connectors for both electrical and fluid lines. After installation, power up the system, clear any fault codes, and verify flow and sensor feedback with a diagnostic tool.

Final Thoughts
If your JCB equipment shows DEF delivery faults, SCR errors, or performance interruptions, this OEM QLS Head Unit is the direct-fit solution. Backed by factory compatibility and durability, it restores system efficiency—now available at Tamerx.