Kalmar Ottawa Cummins ISL, ISB 6.7L DEF Head Unit

Reliable DEF Control for Yard Trucks: Kalmar Ottawa Cummins ISL / ISB 6.7L DEF Head Unit (OEM 90035877)

What is it?
The DEF Head Unit (OEM 90035877) is a control and fluid‐handling assembly designed for use with Cummins ISL or ISB 6.7L engines in Kalmar Ottawa yard truck and material handling applications. It manages Diesel Exhaust Fluid (DEF) injection, monitors fluid quality/flow, and integrates into the after-treatment system to help ensure NOₓ reduction and emission compliance.

Why Choose This Kalmar Ottawa DEF Head Unit (OEM 90035877)?
Designed to Kalmar Ottawa OEM standards, this head unit aligns perfectly with factory interfaces—including mounting points, wiring harnesses, fluid ports, and sensor locations. Choosing an exact OEM part minimizes installation headaches, ensures the system communicates properly with the vehicle’s ECM/after-treatment controls, and helps maintain reliable operation in demanding industrial environments.

Key Benefits
✅ Factory Specification Fit: Mounting, ports, and sensors match the original 90035877 unit for direct replacement.
✅ Industrial-Grade Durability: Built to handle harsh yard truck conditions—high cycles, vibration, exposure to diesel exhaust and DEF.
✅ Precise DEF Monitoring & Injection: Maintains accurate flow and sensing for reliable SCR/after-treatment performance.
✅ Reduced Downtime Risk: OEM-matched unit helps avoid mis-fit, sensor faults, or system calibration issues.
✅ System Longevity: Proper DEF delivery and monitoring reduce stress on SCR catalysts, sensors, and associated exhaust components.

Applications
This head unit is suited for Kalmar Ottawa yard trucks, forklifts, terminal tractors and material handling units equipped with Cummins ISL or ISB 6.7L engines where DEF dosing and emission control are required. It is ideal for logistics, port, terminal, and industrial operations demanding service reliability and uptime.

Installation Notes
Installation should be done by a qualified technician. First, verify that your engine and unit match the OEM part number 90035877 and that the vehicle model is compatible with the Kalmar Ottawa system. Relieve any system pressure and disconnect the wiring harnesses and DEF fluid lines. Remove the old head unit carefully, paying attention to mounting bolts, gasket surfaces, and port alignment. Clean all mating surfaces, inspect for any damage or residue, and install the new unit with fresh seals/gaskets and correct torque. Reconnect wiring and fluid lines, then clear any diagnostic trouble codes in the ECM/after-treatment controller. Finally, run the vehicle through a monitored operating sequence to confirm proper DEF flow, sensor readings, and system integration.

Final Thoughts
The after-treatment system is only as effective as the key components within it. The Kalmar Ottawa Cummins ISL / ISB 6.7L DEF Head Unit (OEM 90035877) provides a factory-aligned, robust solution for yard truck and industrial applications—helping maintain DEF system integrity, emission compliance, and operational uptime in demanding duty cycles.