Shandong Shengyue Technology Development Co.,Ltd is one of the most professional sinotruk howo a7/t7h intermediate axle main reducer assembly / differential assembly az7121320745 manufacturers and suppliers in China. Please feel free to buy high quality genuine auto parts at competitive price from our factory.
SINOTRUK HOWO A7/T7H Intermediate Axle Main Reducer Assembly / Differential Assembly AZ7121320745
Internal Core Component Structure of the Assembly
1. Reduction Transmission Mechanism: Comprising driving and driven bevel gears (gear ratio 5.73:1), this mechanism performs the first stage of gear reduction and transmits power through a 90-degree turn.
2. Inter-axle Differential (Through-drive Differential): Balances the speed difference between the front and rear drive axles, allowing them to rotate at different speeds and preventing abnormal tire wear.
3. Wheel Differential: Distributes power to the left and right axle shafts, ensuring smooth wheel operation during turns.
4. Differential Lock Actuator: Equipped with a pneumatic differential lock fork and shift fork shaft; if the vehicle gets stuck in mud and experiences one-sided wheel slip, the driver can lock the differential with a single button press to force the vehicle out.
Strictly and regularly check the gear oil:It is recommended to check the lubricant level every 15,000 kilometers and to perform regular oil changes strictly in accordance with the heavy-duty gear oil specifications officially recommended by Sinotruk.
Oil Seal Leakage: During routine maintenance, check the input and output oil seals for signs of leakage. Oil starvation caused by oil seal aging is the primary culprit behind the main reducer seizing up due to overheating.
Core Geartrain & Drive Elements
| Component Name | Recommended Qty | Critical Technical Specs / Assembly Reqs | Remarks |
|---|---|---|---|
| Main Drive Pinion & Ring Gear Set | 1 Set | 5.73 Ratio (Matched bevel pinion & ring gear) | Must be replaced as a matched set; mixing single gears is strictly forbidden sinotrukhowo.cn. |
| Through-Drive Shaft Assembly | 1 Pc | Gear teeth must be free of pitting; splines intact | Responsible for transmitting power to the rear-rear axle. |
| Front Input Flange Assembly | 1 Pc | Sealing journal surface must be smooth without grooves | Connects to the front propeller/drive shaft universal joint. |
| Rear Output Flange Assembly | 1 Pc | Precision-ground mating end face | Connects to the inter-axle drive shaft leading to the rear axle. |
Differentials & Lock Mechanism Components
| Component Name | Recommended Qty | Critical Technical Specs / Assembly Reqs | Remarks |
|---|---|---|---|
| Inter-Axle Differential Assy | 1 Set | Internal planetary gears must rotate smoothly | Compensates for speed differences between middle and rear axles. |
| Inter-Wheel Diff Spider Cross | 1 Pc | No step-wear on journals; meet standard OD dimensions | The core structural frame of the wheel differential. |
| Inter-Wheel Diff Pinions | 4 Pcs | No severe wear on backing surface or internal bore | All 4 pcs must be replaced simultaneously for even load sharing. |
| Inter-Wheel Diff Side Gears | 2 Pcs | Tight spline fitment with the axle shaft | One for left side and one for right side; transfers torque to axle shafts. |
| Differential Thrust Washer Kit | 1 Set | Includes copper planetary washers & side gear thrust washers | Used to adjust gear backlash and axial clearances. |
| Differential Lock Sliding Sleeve | 1 Pc | No chipping or deformation on engagement teeth | Mechanical locking execution sleeve. |
| Diff Lock Shift Fork & Shaft | 1 Set | Fork must be straight and free of bending; slides smoothly | Core components for pneumatic differential lock engagement. |
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