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Sinotruk 10-Speed Manual Transmission Assembly HW90510C
HW90510C Core Overhaul & Wear Parts BOM Table
| Key Parts | English Description | Symptoms of Failure & Inspection Advice |
|---|---|---|
| Synchronizer Cone / Ring | Synchronizer Assembly | Core manual transmission wear part. Must be inspected/replaced if gear grinding, stiff shifting, or severe gear jumping occurs. |
| Countershaft Bearings | Front & Rear Bearings | Recommended for replacement if high-frequency noise or binding occurs. Pitting or flaking on the races will destroy the gears. |
| Rear Housing Assembly | Auxiliary Box Rear Case | Absorbs the impact from the driveshaft. Check around bolt holes for cracks, oil seepage, or deformation. |
| PTO Sliding Sleeve | Power Take-Off Engagement Sleeve | Top cause of upper body power failure. Worn or pointed gear teeth lead to automatic disengagement and lift failure of the hydraulic pump. |
| Piston O-Ring | Air Cylinder Shifter O-Ring | Rubber wear part. Aging causes air leakage, making the PTO unable to engage smoothly. |
| Input / Output Oil Seals | Shaft Lip Oil Seals | Must-replace item during disassembly. Seals the internal gear oil. Aging leads to clutch slippage or oil slinging at the driveshaft end. |
Gear Ratios & Performance
| Gear Level | Transmission Ratio (Value) | Real-World Operational Performance |
|---|---|---|
| 1st Gear (Crawler) | 9.06 | Ultra-large ratio provides powerful torque for starting under heavy load, mud, or steep inclines. |
| 2nd / 3rd Gear | 6.54 / 4.77 | Low-speed heavy hauling gears, ideal for transitioning out of job sites or city traffic. |
| 4th / 5th Gear | 3.51 / 2.62 | Top gears of the main box low-speed zone, ideal for complex national road conditions. |
| 6th / 7th Gear | 1.86 / 1.34 | Enters the high-speed zone, suitable for mid-speed cruising or gentle slopes. |
| 8th / 9th Gear | 1.00 (Direct Drive) / 0.779 | 9th gear is direct drive with maximum transmission efficiency; 10th is overdrive. |
| 10th Gear (Top Gear) | 0.72 ~ 0.78 (Varies by batch) | Reduces engine RPM during high-speed cruising, maximizing fuel efficiency for long-haul logistics. |
| Reverse (R1 / R2) | 8.35 / 1.71 | R1 provides maximum torque for reverse climbing; R2 allows fast reversing when unladen. |
Application & Powertrain Matching
| Matching Item | Compatible Models / Chassis Categories | Powertrain Advantage |
|---|---|---|
| Rated Input Torque | 900 N·m | Perfectly matches high-horsepower 4-cylinder or mid-horsepower 6-cylinder diesel engines. |
| Engine Compatibility | Weichai WP3N/WP4.1N, Sinotruk MC05, Cummins ISF3.8 | Forms the Golden Powertrain Chain for light to medium-duty heavy haul trucks. |
| Primary Truck Models | HOWO Hanjiang, Commander, King of All-Rounder, Huanghe | Dominates the chassis market for high-standard 8 to 18-ton transport capacities. |
| Common Body Types | Dump trucks, sanitation trucks, concrete mixers, truck cranes | The rear auxiliary box extension shaft allows easy mounting of HW50 series PTOs. |
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