SR8AT500R-I Automatic Transmission
The Shengrui SR8AT500R Longitudinal 8-Speed Automatic Transmission has a maximum input torque of 500 N·m, a maximum input speed of 6000 RPM, a gear ratio range of 7.8, overall dimensions of 672.1×407.5×414.8 mm and a fixed wet weight of 88 kg.
In the detailed model code, “SR” stands for the Shengrui brand, “8” represents 8 forward gears, “AT” means automatic transmission, “500” indicates the rated maximum input torque of 500 N·m, and “R” denotes rear-wheel longitudinal layout. This model adopts exclusive electronic shift with optional auto start-stop function, compatible with gasoline and diesel engines, and supports longitudinal rear-wheel 2WD and 4WD layouts for rear-wheel-drive off-road vehicles, SUVs, pickups, MPVs, medium buses and other passenger and commercial vehicles.
As part of EMAC, DuraMac provides a complete power system integrating DCEC engine, Fast-Eaton clutch, DaTong-Gear gearbox, Dongfeng-DANA axle and Komman air suspension. With the future trend of automotive electrification, Duramac is also actively developing in the field of electric vehicle power systems.
The company provides customers with full life cycle services, from design to power system supply, installation and commissioning, to after-sales service training and spare parts supply, as well as troubleshooting and overhaul technical support. This full range of services ensures that customer equipment maintains high reliability and long-term operating efficiency during use.
Advantages of SR8AT500R-I Automatic Transmission
-
Platform-based design with mature technical solutions for easier variant expansion.
-
High efficiency and energy saving, with a maximum transmission efficiency up to 95%.
-
Integrated electronic technology to support electronic shift operation.
-
Suitable for matching rear-wheel-drive off-road vehicles, SUVs, pickups, MPVs, medium buses and other passenger and commercial vehicles.
Technical Specifications
| Model: | SR8AT500R-I |
| Drive Layout: | Longitudinal Rear-wheel 2WD & 4WD |
| Maximum Input Speed: | 6000 RPM |
| Maximum Input Torque: | 500 N.m |
| Torque: | 280 – 500 N.m |
| Total Length: | 672.1 * 407.5 * 414.8 mm |
| Gear Ratio Range: | 7.8 |
| Wet Weight: | 88 kg |
| Optional Configuration: | Auto Start-Stop |
| Lead Time: | 15 – 30 Working Days |
| Payment Terms: | T/T ,L/C |
HW95508A
The DaTong-Gear HW95508ACL AMT Hybrid Gearbox has external dimensions of 762.2 mm * 464.4 mm * 550 mm, a weight of 148 kg, and an oil capacity of 6L. This gearbox is suitable for light to medium-duty vehicles with a power range between 220 and 300 horsepower.
DuraMac
DCEC ISL8.9 series automotive engine is four-strokes engine with 102 mm bore and 120 mm stroke, Equipped with Bosch (or BYC or Weifu) pump. engine comes with turbocharger and Air- Air intercooler. The prime power range is from 269 HP to 394 HP.
Fast Gear
The F6A Series Automated Transmission uses the FAST automatic transmission, has six front gears, the transmission ratio step arrangement is reasonable, has very outstanding fuel economy. Adopt hydraulic automatic transmission. The F6A Series Automated Transmission has six gears, each with a different reduction ratio.
EV Truck
Electric wheel dump trucks use electricity as a power source, completely abandoning traditional fuel engines. This change enables the vehicle to achieve true “zero emissions” during operation, without the emission of pollutants such as carbon monoxide, nitrogen oxides, and particulate matter in the exhaust gas, greatly reducing the pollution to the atmospheric environment.
DANA Axle
Applying the advanced technology of DANA with high efficiency, fuel economy, strong load torque, low noise,high reliability, lower procurement cost, low repair cost and lower maintenance cost.
Datong Gear
The Datong HW25712XSJ Heavy Manual No-Sync Gearbox has a torque of 2500 N.m, a gear ratio range of 14.941-1, an oil capacity of 13 L (13.5 L when equipped with a power take-off), an overall length of 993 mm, and a weight of 428 kg.
Crane Trucks
The DFZ5258JSQSZ6D truck crane is a powerful and versatile vehicle designed for efficient lifting and transportation tasks. Equipped with a YCS06300-61 engine and a Shaanxi Auto Fast gear : 10JS120TA high-low gear with synchronizer、PTO gearbox, it provides strong and stable power for demanding operations.
Model |
Torque |
Wet Weight |
Total Length |
Compatible Engine Torque Range |
| SR8AT250F | 250 N.m | 80 kg | 389.5 * 591.8 * 431.3 mm | 120-250 N.m |
| SR8AT300F-I | 300 N.m | 83 kg | 389.5 * 591.8 * 431.3 mm | 120-300 N.m |
| SR8AT300F-II | 300 N.m | 86 kg | 389.5 * 591.8 * 431.3 mm | 120-300 N.m |
| SR8AT380F | 380 N.m | 87 kg | 372.1 * 607.6 * 407.7 mm | 150-380 N.m |
| SR8AT420F | 420 N.m | 97 kg | 368.8 * 622.3 * 418.9 mm | 350-420 N.m |
| SR8AT320R | 320 N.m | 85 kg | 656.0 * 488.7 * 453.4 mm | 250-320 N.m |
| SR8AT500R-I | 500 N.m | 88 kg | 672.1 * 407.5 * 414.8 mm | 280-500 N.m |
| SR8AT500R-II | 500 N.m | 105 kg | 670.9 * 454.1 * 453.6 mm | 280-500 N.m |
| SR8HT420F | 420 N.m | 108 kg | 414.4 * 411.4 * 629.5 mm | 150-380 N.m |
| SR8HT500R | 500 N.m | 110 kg | 786.8 * 413.6 * 416.1 mm | 280-500 N.m |
| SRDHT500R | 500 N.m | 160 kg | 738.4 * 453 * 453 mm | 300-500 N.m |
| ——END—— | ||||
SR8AT500R-I Automatic Transmission Main Performance Parameters
| Product Model | All Gear Positions Speed Ratio Table | ||||||||||||
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | R | |||||
| SR8AT500R-I | 5.00 | 3.20 | 2.14 | 1.72 | 1.31 | 1.00 | 0.82 | 0.64 | 3.46 | ||||
| Drive Layout | Longitudinal Rear-wheel 2WD & 4WD | Maximum Input Torque | 500 N.m | ||||||||||
| Maximum Input Speed | 6000 RPM | Compatible Engine Torque Range | 280 – 500 N.m | ||||||||||
| Weight (Wet Weight) | 88 kg | Optional Configuration | Auto Start-Stop | ||||||||||
| Shift Mode | Electronic Shift | Gear Ratio Range | 7.8 | ||||||||||
| Overall Dimension | 672.1×407.5×414.8 mm | Compatible Vehicles | SUVs, Pickups, etc. | ||||||||||
| Engine Type | Gasoline & Diesel | ||||||||||||
Our products are designed and manufactured in strict accordance with industry standards, ensuring the precision of every part’s dimensions to meet the high standards of compatibility, performance, and safety required by our customers. The accuracy of dimensions is crucial for the correct installation and optimal operation of the products; any deviation may lead to installation issues, performance degradation, or even safety hazards. Therefore, we strongly recommend that customers carefully refer to the technical drawings and specifications we provide when purchasing, and select the most suitable product model based on their specific needs and procurement standards. We are committed to delivering high-quality products and exceptional customer service to ensure customer satisfaction and the smooth progress of projects.
The following is the numbering rule of the SR8AT500R Passenger Type Automatic Transmission. It is an ultra-high torque longitudinal 8-speed automatic transmission compatible with both gasoline and diesel engines, supporting longitudinal rear-wheel 2WD and 4WD layouts with exclusive electronic shift and optional auto start-stop function. It adopts platform-based design with mature technical solutions for easy variant expansion, delivers high efficiency and energy saving with a peak transmission efficiency up to 95%, and integrates electronic technology to support electronic shift operation. This unit can be widely matched to rear-wheel-drive off-road vehicles, SUVs, pickups, MPVs, medium buses and various passenger and commercial vehicles.
Use, Maintenance, and Precautions for SR8AT500R Automatic Transmission
Requirements for use
Operating the transmission properly and reasonably, and conducting regular maintenance are crucial for ensuring the safe and reliable operation of the vehicle and for extending the lifespan of the transmission. Please follow the usage requirements outlined below：
1. Lubricant Specification
The transmission should be filled with 85W/90 GL-5 grade vehicle gear oil.
2. Correct oil level
Make sure the oil level is flush with the oil level observation port. Check the oil level through the oil level observation port on the side of the housing. Fill the oil until it overflows from the orifice. The oil filling volume is about 12L (12.5L when a power take-off is installed).
3. Oil Level Check
The oil level height should be regularly inspected, and the vehicle should be parked on a level surface for the oil level check. To prevent inaccurate measurements due to the expansion of hot oil, the vehicle should not be checked immediately after driving. The inspection should only be conducted when the oil level is stable and the oil temperature is close to ambient temperature.
4. Replenish the lubricant
In order to prevent chemical reactions between different types of lubricants, the lubricant should be of the same type as the original lubricant when replenishing it.
5. Oil Change Period
When changing the lubricating oil in the transmission, first drain the original lubricating oil in the transmission and clean the filter assembly.
The new transmission must have its lubricating oil replaced when it has been driven between 2,000 to 5,000 kilometers.
The oil level and leakage of the lubricating oil should be checked every 10,000 kilometers, replenished at any time, and the filter screen should be cleaned.
The lubricating oil should be replaced every 50,000 kilometers.
6. Operating Temperature
The maximum temperature of the transmission during continuous operation must not exceed 120°C and the minimum temperature must not be lower than -40°C. If the operating temperature exceeds 120°C, the lubricating oil will decompose and shorten the service life of the transmission.
Any of the following conditions can cause the transmission’s operating temperature to exceed 120°C.
- Operating continuously at a driving speed of less than 32 km/h.
- High engine speed.
- High ambient temperature.
- Vortex Surrounding transmission.
- The exhaust system is too close to the transmission.
- High-power overspeed operation.
7. Working Tilt Angle
When the operating inclination angle of the transmission exceeds 15°, lubrication may be insufficient (the operating inclination angle is equal to the mounting angle of the transmission on the chassis plus the ramp angle).
8. Drag or slide
When the transmission is working, the countershaft’s rotation drives the oil pump, and with the addition of splash lubrication, it provides sufficient lubrication for the transmission. But when a vehicle is towed with its rear wheels on the ground and the transmission is connected to the drivetrain, the countershaft gears and the mainshaft gears in the main box do not turn, but there is relative rotation between the mainshaft and its gears, and the planetary mechanism also turns. This can cause serious damage to the planetary mechanism and the mainshaft positioning elements of the transmission due to a lack of lubrication.
To prevent such occurrences, the following points should be noted:
Do not depress the clutch pedal to coast the vehicle in neutral.
When the vehicle needs to be towed, the half shaft can be pulled out or the transmission shaft can be disengaged, or the driving wheels can be lifted off the ground for towing.
9. Push Clutch Bearing Lubrication
Add grease during vehicle maintenance, 8-10ml each time; in addition, users can add grease from time to time according to the use of the clutch.
Matters needing attention
1. When shifting gears, the clutch must be fully disengaged, and the gear lever should be properly positioned in gear.
2. The shift handle switch valve has two positions: high gear and low gear. When parking, the switch valve should be placed in the neutral position in the low gear area.
3. When the vehicle is in low gear or reverse gear, it should be stopped first and then put into gear to avoid damaging the internal parts of the transmission.
4. When shifting the transmission from the low gear range to the high gear range (and vice versa), the switch valve should first be set to the H position, then clutch and shift to neutral. After a conscious pause in the neutral position, depress the clutch pedal again and shift to the 6th gear (which is in the 1st gear position). Avoid skipping gears, otherwise, it will impact the service life of the auxiliary gearbox synchronizer.
5. When the vehicle is going downhill, it is forbidden to change the high and low gear zones.
6. Depending on the road conditions, start in 1st or 2nd gear.
7. Before the vehicle starts, the brakes should be released first. For vehicles equipped with air brake systems, after the brake valve is activated, you must wait until the air pressure reaches the level necessary to disengage the brakes before you can shift gears and begin to move.
8. If unusual noises are heard from the transmission while in use, or if the operation feels significantly heavier or other abnormal phenomena are observed, one should immediately stop the vehicle and check it. Resume driving only after the issue has been resolved.
9. This transmission features an interlock mechanism between the main and auxiliary gearboxes. If the auxiliary gearbox has not fully engaged a gear, shifting in the main gearbox is locked out. If you are unable to select a gear, it could be that the interlock between the main and auxiliary boxes is in effect. Please wait for a moment before attempting to shift gears again.
If you still cannot engage the gears, at this point, you should inspect the range gear cylinder and its air lines to identify which component is malfunctioning and repair it promptly.
10. The transmission within the “three guarantees” (warranty) period must not be disassembled or assembled without authorization.
Note: All Above Data are Just for Reference, All Data Might Change Without Notices or Updates, Please Contact Our Sales Team to Confirm All Details Via WhatsApp or Email.
Gearbox Sale Manual
Installation Drawing
Installation Manual
Operation Manual
Parts Catalogue
