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SCR System – Complete Selective Catalytic Reduction Kit for Sitrak C7H

The part is a comprehensive emission control solution designed to reduce nitrogen oxide emissions in the Sitrak C7H. This complete kit includes all sensors, pumps, lines, and electronic components required for a full SCR installation or replacement.

This high-quality SCR System kit includes the Urea Level Temperature Sensor (with heating solenoid valve), Hexagon Flange Bolts M8, Urea Pump, Hexagon Flange Nuts M8, Polyamide Tube, Electrically Heated Urea Line (tank-pump-pump-tank), Coolant Rubber Hose I, Urea Tank Heating Pipe (valve-urea tank), Electrically Heated Pressure Line (1000mm), Hexagon Flange Bolts M8, NOx Sensor (OE072), Chassis Electrical Junction Box for Engine, Relay Waterproof Housing, Urea Nozzle Cooling Line I (3100mm), Urea Nozzle Cooling Line II (2170mm), Hexagon Flange Bolts M6, Urea Nozzle, Exhaust Temperature Sensor, SCR Wiring Harness (electrically heated), OBD Label, and Hexagon Flange Serrated Bolts M10*1. Every component of this SCR System is engineered to OEM specifications for a perfect fit and reliable performance.

The part uses a urea-based selective catalytic reduction process to convert harmful NOx gases into harmless nitrogen and water vapor. The system includes a high-precision urea pump, heated lines to prevent crystallization, and advanced NOx sensors for closed-loop control, ensuring optimal emission reduction across all operating conditions.

For complete technical specifications and ordering details, please refer to the official Sinotruk Catalog, which provides comprehensive information on all available variants and compatible truck models for The part.

Whether you are replacing a faulty SCR component or performing a full emissions system overhaul, this SCR System delivers factory-quality components and a straightforward installation. This SCR System is the definitive choice for operators who demand emission compliance and long-term reliability.

SCR System

Component Details of SCR System

Urea Level Temperature Sensor (with heating solenoid valve)

This sensor monitors urea level and temperature within the tank. In The part, it includes an integrated heating solenoid valve that prevents urea crystallization in cold conditions, ensuring reliable fluid delivery to the dosing module.

Hexagon Flange Bolt M8

These M8 flange bolts secure various components of The part. They are grade 8.8, zinc-plated for corrosion resistance, and feature an integrated flange for even load distribution.

Urea Pump

This is the main pump of The part, delivering urea solution from the tank to the dosing module. It features a brushless DC motor with a flow rate of 1.5 L/min and a pressure capability of 5 bar, ensuring precise dosing.

Hexagon Flange Nut M8

These M8 flange nuts pair with the M8 bolts. In the SCR System, they are grade 10 and feature a serrated flange for vibration resistance, ensuring secure fastening.

Polyamide Tube

This tube carries urea solution from the tank to the pump and from the pump to the dosing module. In the SCR System, it is made of PA12 with an outer diameter of 6mm, resistant to urea and temperature extremes.

Electrically Heated Urea Line (tank-pump-pump-tank)

This heated line ensures urea remains fluid in cold weather. In the SCR System, it features a self-regulating heating element and is insulated to prevent heat loss, with quick-connect fittings for easy installation.

Coolant Rubber Hose I

This rubber hose carries engine coolant to the urea tank heating system. In the SCR System, it is made of EPDM with a fabric reinforcement, rated for temperatures up to 120°C and pressures of 3 bar.

Urea Tank Heating Pipe (valve-urea tank)

This pipe circulates warm coolant to the urea tank. In the SCR System, it is made of stainless steel with a 15mm outer diameter and includes a flow control valve to regulate heating.

Electrically Heated Pressure Line (1000mm)

This 1000mm heated pressure line connects the urea pump to the dosing module. In the SCR System, it includes a pressure sensor port and a self-regulating heating element.

NOx Sensor (OE072)

This sensor monitors NOx levels upstream and downstream of the SCR catalyst. In the SCR System, it uses ceramic sensing technology and provides real-time data to the ECU for closed-loop control.

Chassis Electrical Junction Box for Engine

This junction box houses relays and fuses for the SCR System. It is IP67-rated and includes a pre-wired harness with labeled connectors for the pump, sensors, and heating elements.

Relay Waterproof Housing

This waterproof housing protects the SCR system relay from moisture and debris. In the SCR System, it is made of UV-stabilized nylon with a rubber seal and a snap-lock cover for easy access.

Urea Nozzle Cooling Line I (3100mm)

This 3100mm cooling line circulates coolant to the urea nozzle. In the SCR System, it prevents nozzle overheating and urea crystallization, ensuring consistent spray pattern and dosing accuracy.

Urea Nozzle Cooling Line II (2170mm)

This 2170mm return line completes the cooling circuit for the urea nozzle. In the SCR System, it is identical in construction to the supply line but routed back to the coolant system.

Hexagon Flange Bolt M6

These M6 flange bolts secure smaller components in the SCR System. They are grade 8.8 and zinc-plated, suitable for light-duty fastening applications.

Urea Nozzle

This nozzle injects atomized urea into the exhaust stream. In the SCR System, it features a precision-ground orifice and an integrated cooling jacket, delivering consistent droplet size for optimal NOx reduction.

Exhaust Temperature Sensor

This sensor monitors exhaust gas temperature before and after the SCR catalyst. In the SCR System, it uses a thermocouple design and provides critical data for urea dosing control.

SCR Wiring Harness (electrically heated)

This wiring harness connects all SCR System components to the ECU. It includes circuits for the pump, sensors, heating elements, and valves, with a heat-resistant outer sleeve and labeled connectors.

OBD Label

This label provides On-Board Diagnostic information for the SCR System. It is UV-stable, adhesive-backed, and includes the system part number and calibration data for service reference.

Hexagon Flange Serrated Bolt M10*1

These M10 serrated flange bolts secure the main SCR mounting brackets. In the SCR System, they are grade 10.9 and feature a fine pitch thread for positive locking.

Product Parameters of SCR System

No. Part No. Name
1WG1034121049Urea Level Temperature Sensor (with heating solenoid valve)
2ZQ1840885Hexagon Flange Bolt M8
3202V27120-0007Urea Pump
4ZQ32008Hexagon Flange Nut M8
6AZ9112550120Polyamide Tube
7WG1034120170Electrically Heated Urea Line (tank-pump-pump-tank)
8WG1246120076Coolant Rubber Hose I
9202V27120-0022Urea Tank Heating Pipe (valve-urea tank)
10WG1034120179Electrically Heated Pressure Line (1000mm)
11ZQ1840825Hexagon Flange Bolt M8
12WG1034121032/1NOx Sensor (OE072)
13812W25444-6001Chassis Electrical Junction Box for Engine
14YG9625560502Relay Waterproof Housing
15202V27120-0013Urea Nozzle Cooling Line I (3100mm)
16202V27120-0045Urea Nozzle Cooling Line II (2170mm)
17ZQ1840625Hexagon Flange Bolt M6
18202V27120-0008Urea Nozzle
19WG1034121033Exhaust Temperature Sensor
20202V27120-0314SCR Wiring Harness (electrically heated)
21WG1034121010OBD Label
22ZQ1811035TF6Hexagon Flange Serrated Bolt M10*1
23ZQ325101T3F6Hexagon Flange Serrated Bolt M10*1

Why Choose Our SCR System?

High-Efficiency NOx Reduction

The SCR System achieves up to 90% NOx conversion efficiency through precise urea dosing and closed-loop control. This ensures your Sitrak C7H meets the most stringent emission regulations, reducing environmental impact and avoiding costly compliance penalties.

Complete Kit with All Components

This SCR System kit includes every sensor, pump, line, and fastener required for a full installation. The pre-terminated wiring harness and labeled connectors simplify installation, saving time and ensuring compatibility.

Advanced Heating and Anti-Crystallization

The SCR System features electrically heated lines and coolant-based tank heating to prevent urea crystallization in sub-zero temperatures. This ensures reliable dosing and prevents system blockages, reducing maintenance costs and downtime.

OEM Quality and Precision Calibration

The SCR System is manufactured to the exact OEM specifications, guaranteeing a perfect fit on the Sitrak C7H. The NOx sensors and control software are pre-calibrated for optimal performance, eliminating the need for complex setup procedures.

Online Catalog of SINOTRUK Parts

Learn More

Our online catalog provides comprehensive access to genuine SINOTRUK parts for all major vehicle lines — including HOWO, Sitrak, Steyr, and Yellow River series trucks. You can browse detailed specifications, original part numbers, and exploded-view diagrams for every assembly. Whether you are performing routine maintenance or planning a major overhaul, the catalog helps you quickly identify the correct components for your vehicle. When you become a SINOTRUK customer, we offer complimentary full‑access catalog services, ensuring you always have the latest product data and interchangeability information at your fingertips to support efficient fleet management and accurate parts ordering.

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