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Brand: C.OEFT
OE numbers: 625DHA-1500010
Product Name: Automatic Transmission Assembly
Compatible model:625DHA-1500010
Product status:Remanufactured
Product weight: 100.000KG
Packaging size:63X41X36 cm
Product packaging: Neutral Packaging
Car Series: Chinese
Car Type: for Chery Tiggo 7 T15 Tiggo 7
1. Core Power Transmission & Torque Adjustment
As the central drivetrain component, the assembly transfers power from the engine to the drive wheels. It uses an integrated torque converter to replace the manual clutch, transmitting engine power via hydraulic fluid to the input shaft. The internal gear sets then adjust torque and speed according to the selected gear—lower gears multiply torque for acceleration and climbing, while higher gears reduce torque for efficient high-speed cruising.
2. Automatic Gear Selection & Adaptive Shifting
Working in tandem with the vehicle’s TCU, the assembly 实现 fully automatic gear changes. The TCU continuously monitors parameters such as engine speed (RPM), throttle position, vehicle speed, and brake input to determine optimal shift points. For example, during aggressive acceleration (throttle opening ≥80%), it delays upshifts to maximize power; during light throttle application (≤30%), it upshifts early to save fuel. It also adapts to driving styles—recognizing frequent acceleration/deceleration as “sporty” and adjusting shift logic accordingly.
3. Torque Converter Operation & Lockup Control
The torque converter features three key components: impeller (engine-driven), turbine (transmission-driven), and stator (torque multiplier). During low-speed operation (e.g., starting from a stop), the stator redirects fluid flow to multiply torque by 2.5-3x, providing sufficient low-end power. Once the vehicle reaches 60-80 km/h, the TCU activates a lockup clutch to mechanically link the impeller and turbine, eliminating fluid slippage and improving power transfer efficiency by 5-8%.
4. Hydraulic System Regulation
The valve body serves as the assembly’s hydraulic control center, directing transmission fluid to clutch packs, solenoids, and the torque converter via precision-machined passages. High-precision pressure regulators maintain hydraulic pressure within 0.5-2.5 bar, ensuring consistent clutch engagement. A built-in pressure relief valve prevents overpressure damage, while a filter screen traps debris to protect sensitive components from contamination.
5. TCU Communication & Diagnostic Capabilities
The assembly connects to the TCU via a 14-pin electrical connector, transmitting real-time data including transmission fluid temperature (monitored via a NTC sensor), gear position, and solenoid current. If a fault is detected (e.g., solenoid short circuit, low fluid pressure), the TCU stores a diagnostic trouble code (DTC) such as P0740 (torque converter clutch malfunction) and illuminates the transmission warning light. Mechanics can retrieve codes using universal diagnostic tools (e.g., Launch X431) for rapid troubleshooting.
6. Safety Features: Park & Reverse Interlocks
Park (P) Position: Engages a mechanical parking pawl that locks the output shaft, preventing the vehicle from rolling when stationary.
Reverse (R) Interlock: Requires the brake pedal to be depressed before shifting from P/N to R, preventing accidental reverse engagement.
Limp-Home Mode: If a critical fault is detected, the TCU limits the assembly to 2nd gear, allowing the driver to safely reach a repair facility without further damage.
1. Wide-Range Vehicle Compatibility with OE-Grade Standards
The Transmission Assembly Gearbox 625DHA-1500010 is engineered to deliver broad compatibility with multiple mainstream compact and mid-size vehicles, particularly suited for models equipped with 1.5L-2.0L gasoline or naturally aspirated engines (common in brands like Chery, Geely, and Changan). Adhering to industry-wide OE-grade design benchmarks, it matches critical parameters such as bell housing bolt patterns, input/output shaft spline counts (21-spline input, 27-spline output), and mounting hole positions with a tolerance of ±0.15mm. This versatility eliminates the need for custom modifications, enabling mechanics to use it across various vehicle platforms while avoiding issues like powertrain misalignment or TCU (Transmission Control Unit) communication failures.
2. Robust All-Round Construction for Diverse Environments
Gear System: Core gear sets are forged from 20CrNiMo alloy steel—superior to standard 20CrMnTi—undergoing carburizing, quenching, and precision grinding to achieve a surface hardness of HRC 60-63 and a core toughness of ≥90 J/cm². This allows the assembly to withstand continuous torque loads of up to 250 Nm without tooth pitting or deformation.
Housing: Die-cast from high-strength aluminum alloy (ADC12) with reinforced ribbing at stress points, the housing resists vibration (up to 35g) and thermal expansion, maintaining structural integrity in temperatures ranging from -40°C to 130°C—suitable for both cold northern regions and hot southern climates.
Sealing & Protection: Equipped with double-lip Viton rubber seals and stainless steel gaskets, the assembly provides a leak-proof barrier against transmission fluid seepage. An integrated dust cover on the input shaft further prevents contamination from dirt and debris, extending component lifespan in off-road or dusty driving conditions.
3. Optimized Shift Performance for Comfort & Efficiency
Featuring a recalibrated valve body and high-response solenoids (response time ≤200ms), the 625DHA-1500010 delivers smooth, quick gear transitions. Its 5-speed automatic configuration (gear ratios: 1st 3.125, 2nd 1.846, 3rd 1.214, 4th 0.893, 5th 0.705) is optimized for balance between low-end torque and high-speed efficiency. During urban stop-and-go driving, it minimizes shift shudder; on highways, the overdrive 5th gear reduces engine RPM by 15-20% at 120 km/h, improving fuel economy by 7-9% compared to older 4-speed transmissions.
4. Cost-Effective Versatility for Repair Shops & Fleet Operators
Offering multi-vehicle compatibility at 30-40% lower cost than brand-specific OEM assemblies, the 625DHA-1500010 is an economical choice for repair shops and fleet management. Its modular design allows easy replacement of individual components (solenoids, clutch packs, valve bodies) without disassembling the entire assembly, cutting maintenance labor time by 25%. Additionally, it is compatible with common transmission fluids (ATF 3309, ATF WS), eliminating the need for specialized fluid inventory.
5. Rigorous Quality Testing for Reliability
Each assembly undergoes a 10-stage quality verification process: static dimensional inspection, component hardness testing, hydraulic pressure leak testing (at 1.5x operating pressure), dynamic shift simulation (5,000+ cycles), noise level measurement (≤75 dB at idle), temperature endurance testing (130°C for 4 hours), vibration resistance testing, TCU compatibility testing, road simulation on dynamometers, and final visual inspection. This ensures a failure rate of less than 0.5% within the first 50,000 kilometers.
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