JAC Gearbox Overhaul 55892265
First and foremost, here are the details highlighting the experience of customer Salem with solving the transmission problem in his JAC JS4 car at Sharara Auto Garage.
The Problem and Symptoms He Faced:
Jerks and Delay: The car was experiencing strong “jerks” (Net’at) when starting to move, along with a clear delay in gear changes.
Abnormal RPM Rise: The engine speed counter (RPM) rose excessively without a corresponding improvement in speed.
Warning Light: The gearbox light appeared on the dashboard, prompting him to search for a specialized workshop.
Addressing the Problem at Sharara Auto:
Initial Diagnosis and Periodic Inspection:
Technicians used a special diagnostic device to check the JAC transmission. A malfunction in oil pressure and clutch performance was identified.
Transparency with the Customer: The supervising engineer explained to Salem that the car needed a complete overhaul due to internal parts damage, not just an oil or filter change.
JAC Gearbox Overhaul Procedures and Execution with the Highest Quality:
After Salem’s approval:
The complete clutch pack was replaced with new, high-quality parts.
All seals and gaskets were changed to prevent hydraulic pressure leakage.
The valve body was meticulously cleaned and inspected.
The transmission oil was replaced with genuine oil suited to the JAC system specifications.
Programming and Testing:
After reassembling the transmission and filling it with new oil, the Transmission Control Module (TCM) computer was adjusted and programmed. An intensive test drive was conducted to ensure performance returned to normal.
Positive Results:
Salem noticed a significant improvement in the car’s performance:
Exceptional Smoothness: The “jerks” completely disappeared with completely unnoticeable shifts.
Faster Response: The transmission’s response upon starting was immediate, without any delay.
Performance Stability: No faults at high speeds and the related RPM issues vanished.
Added Confidence: Salem received a warranty on the service, which boosted his confidence in the quality of work performed by Sharara Auto55892265.
Definition of JAC Gearbox Overhaul
The Chinese car company JAC Motors predominantly relies on DCT (Dual Clutch Transmission) or CVT (Continuously Variable Transmission) systems for its automatic models.
The JAC gearbox overhaul (Tajfeet) process is comprehensive maintenance where the transmission is completely disassembled, worn internal parts are replaced, and it is reassembled to a condition close to new.
Steps and Components of the Overhaul Process:
Component Detailed Explanation of the Process
1. Disassembly and Diagnosis The transmission is completely removed from the car and all internal parts (gears, clutches, valve body) are dismantled. Diagnosis begins by accurately identifying the source of the fault (mechanical, hydraulic, or electronic).
2. Friction Packs (Clutches) Mandatory Replacement: All friction plates (Clutch Packs) and steel plates are replaced with new ones, as they are the primary element that wears out and causes slipping or “jerking.”
3. Seals & Gaskets Mandatory Replacement: All internal and external seals and gaskets are replaced. This step is crucial for restoring the hydraulic pressure necessary for the gearbox to function.
4. Valve Body The valve body is precisely cleaned of any deposits, all solenoids are inspected, and some solenoids may be replaced or repaired to ensure optimal ATF flow and timing.
5. Inspection of Hard Components Internal gears, axles, and bearings are precisely inspected. If there is breakage or wear in a hard part, it is replaced to ensure the gearbox is free of any noises or “whining.”
6. Reassembly and Programming After replacing and cleaning all parts, the gearbox is reassembled with extreme precision.
It is then filled with new gear oil suitable for JAC specifications (usually a specific CVT or DCT type). Finally, the Transmission Control Module (TCM) is programmed to accommodate the new settings.
Importance of JAC Gearbox Overhaul
The JAC gearbox overhaul is an extremely important procedure, especially when signs of advanced wear appear. The importance of this procedure at Sharara Auto Garage is not limited to mere repair, but also aims to ensure continued high performance and long-term reliability of the car.
Here are the key benefits of a JAC gearbox overhaul at Sharara Auto Garage:
1. Restoring Lost Transmission Performance
Addressing Slipping and Shudder: The overhaul is the definitive solution for slipping and noticeable shudder (Jerks), achieved by replacing worn friction plates (Clutches). This ensures the gear shifts smoothly and efficiently, as if it were new.
Improving Oil Pressure: All old seals and gaskets are replaced, restoring the hydraulic pressure system to its optimal state. This is essential for the efficient operation of JAC gearboxes (whether DCT or CVT).
2. Extending Vehicle Lifespan and Performance
Protecting Internal Parts: Overhauling prevents continuous wear that could lead to permanent damage to hard components like gears. Ignoring the overhaul might lead to severe damage requiring complete transmission replacement, which is highly costly.
Reducing Heat Build-up: Renewing clutches and seals reduces excessive friction, which helps to lower operating temperature and protects the gear oil from rapid degradation, thus extending its lifespan.
3. Expertise in Sensitive Chinese Systems
Specialized Experience: Sharara Auto Garage possesses deep experience in handling sensitive Chinese car transmissions like JAC. This expertise allows them to use the latest diagnostic techniques and accurately specify the correct oil and suitable spare parts.
Precise Programming: The technical significance lies in the garage’s ability to perform accurate reprogramming of the Transmission Control Module (TCM) after the overhaul, essential for synchronizing the renewed transmission with the engine’s performance.
4. Ensuring Reliability and Peace of Mind
Comprehensive Inspection: The overhaul addresses all internal faults simultaneously (clutches, bearings, seals, valve body), offering a permanent fix instead of ineffective partial repairs.
Quality Guarantee: A specialized workshop like Sharara Auto often provides a warranty on the overhaul service and the spare parts used, which enhances customer confidence in the quality of the repair.
In summary: A JAC gearbox overhaul at Sharara Auto Garage is a crucial investment to restore the car‘s optimal performance, ensure safe and smooth driving, and avoid the high costs of complete transmission replacement55892265.
