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Brand: C.OEFT
OE numbers: 5140429AA
Product Name:Transmission Valve
Compatible model:
Product status: New
Product weight: 1.7344KG
Packaging size: 15X7.5X6 cm
Product packaging: Neutral Packaging
Car Series: American
Car Type: for Chrysler Jeep Dodge
1. Integrated Oil Circuit Distribution and Gear-Shifting Coordination
The 5140429AA valve body features a precision-machined integrated oil passage structure, which replaces the traditional multi-pipe connection mode, reducing oil flow resistance and leakage risks. It connects the transmission oil pump, solenoid valves, clutches, and brakes through internal oil passages, forming a closed hydraulic control loop. When the transmission needs to shift gears, the Transmission Control Unit (TCU) sends signals to the solenoid valves mounted on the valve body. The solenoid valves then trigger the corresponding spools in the valve body to move, switching the oil passage connections—this directs hydraulic oil to the target clutch/brake and discharges oil from the current clutch/brake, realizing smooth gear engagement and disengagement.
For example, in a North American-brand SUV equipped with a 9-speed automatic transmission (to which the 5140429AA valve body is adapted), when shifting from 3rd gear to 4th gear, the TCU activates the solenoid valve corresponding to the 4th gear clutch. The valve body’s internal spool shifts under hydraulic pressure, opening the oil passage to the 4th gear clutch and closing the oil passage to the 3rd gear clutch. This coordinated action ensures the 3rd gear clutch disengages gradually while the 4th gear clutch engages smoothly, avoiding power interruption or impact during shifting. Additionally, the valve body’s oil passage design optimizes flow direction, reducing oil flow turbulence and ensuring stable pressure during gear changes.
2. Multi-Level Hydraulic Pressure Regulation and Stabilization
A key functional advantage of the 5140429AA valve body lies in its multi-level pressure regulation capability, which adapts to different working conditions of the transmission (such as startup, acceleration, and cruising) by adjusting hydraulic pressure. It is equipped with a main pressure valve, pressure reducing valve, and pressure stabilizing valve: the main pressure valve controls the overall oil pressure output by the oil pump, adjusting it according to engine load (e.g., increasing pressure during heavy loads to ensure clutch engagement tightness); the pressure reducing valve reduces the main pressure to a suitable level for auxiliary components (such as solenoid valves and sensors); the pressure stabilizing valve absorbs pressure fluctuations caused by oil pump pulsation or sudden gear shifts, maintaining pressure stability within ±0.1 bar.
During low-speed startup, the valve body lowers the main pressure to a low level (about 0.8-1.2 MPa), allowing the clutch to engage gently and avoiding vehicle jerking. When the vehicle accelerates rapidly, the valve body increases the main pressure to 2.5-3.0 MPa, ensuring the clutch can withstand high torque without slipping. During constant-speed cruising, it maintains the pressure at a medium level (1.5-1.8 MPa), balancing clutch stability and energy consumption. This dynamic pressure regulation not only improves driving comfort but also reduces wear on transmission components.
1. Wide Adaptability to North American and Domestic High-End Models
The 5140429AA valve body is mainly designed for 8-speed and 9-speed automatic transmissions of North American-brand vehicles and domestic high-end joint-venture models, covering a variety of vehicle types and transmission configurations:
North American-Brand Adaptation: It is a core component for the 9-speed automatic transmissions of mainstream North American brands such as Chrysler, Jeep, and Dodge. For example, it is fully compatible with the ZF 9HP transmission (used in Jeep Grand Cherokee, Chrysler Pacifica) and the Chrysler 8HP transmission (used in Dodge Charger). Its structural dimensions, oil passage layout, and mounting hole positions are perfectly matched to the original transmission systems, eliminating the need for modification during replacement.
Domestic High-End Joint-Venture Adaptation: It is also widely used in domestic high-end joint-venture models equipped with imported or localized North American transmissions, such as the GAC Chrysler 300C, GAC Jeep Compass, and FAW Dodge Durango. These models adopt the same transmission platforms as their North American counterparts, and the 5140429AA valve body meets the strict quality standards of joint-venture manufacturers, ensuring consistent performance with the original parts.
Transmission Torque Compatibility: It can adapt to different torque versions of the same series of transmissions (e.g., the ZF 9HP transmission has low-torque versions for 2.0T engines and high-torque versions for 3.6L V6 engines) through minor adjustments to the main pressure valve’s spring stiffness. This avoids the need for developing multiple valve body models, reducing the inventory pressure for repair shops and manufacturers.
2. High Structural Strength and Low Wear Performance
High-Strength Material Selection: The 5140429AA valve body is made of high-strength aluminum alloy (6061-T6) through die-casting and precision machining. This material has a tensile strength of 310 MPa and a yield strength of 276 MPa, which is 40% higher than that of ordinary aluminum alloy valve bodies. It can withstand long-term hydraulic pressure impact (up to 4.0 MPa) and temperature changes (-40℃ to 150℃) without deformation or cracking. Additionally, the valve body’s surface is treated with anodic oxidation (thickness of 15-20 μm), which improves corrosion resistance and reduces friction between the spool and valve body.
Low-Wear Spool and Valve Seat Matching: The internal spools of the valve body are made of high-hardness alloy steel (42CrMo) and undergo precision grinding and polishing treatment, with a surface roughness of Ra 0.025 μm. The valve seats are processed using a honing technique, ensuring the matching clearance between the spool and valve seat is controlled within 0.003-0.005 mm. This ultra-precise matching reduces wear during spool movement—under normal use conditions, the wear rate is less than 0.001 mm per 100,000 kilometers, significantly extending the valve body’s service life to over 300,000 kilometers (20% longer than that of ordinary valve bodies).
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