Genuine AZ2210040752 synchronizer cone ring for SINOTRUK HOWO 10-speed manual transmissions. OEM replacement for smooth shifting.
If your SINOTRUK HOWO truck is grinding gears or refusing to shift into 5th or 6th under load, the problem might not be the clutch — it could be a worn-out synchronizer cone ring, and specifically, el AZ2210040752 unit used in the main shaft cluster of the 10-speed manual gearbox.
This genuine SINOTRUK synchronizer cone ring is made from high-grade phosphor bronze with micro-grooved friction lining, engineered to match exact factory tolerances. It allows smooth gear changes by equalizing speed between the gear and the shaft before engagement — critical for reducing driver fatigue and preventing damage to internal components.
Unlike cheaper aftermarket copies that use inferior alloys or lack proper heat treatment, the original AZ2210040752 maintains consistent performance even after years of stop-and-go city driving or constant uphill climbs in mountainous regions like the Andes or Himalayas. Its precision taper design ensures rapid synchronization, minimizing shift effort and protecting the dog teeth from chipping.
It’s commonly replaced during major overhauls of the Fast Gearbox RT-11509C y SINOTRUK HW19710 models found in Howo T7H, A7, and ZZ1257 series trucks. When one syncro ring fails, we often recommend replacing matching rings in adjacent gears to avoid future downtime.
We only supply authentic SINOTRUK transmission parts because we’ve seen too many operators lose thousands in lost revenue due to failed rebuilds using off-brand synchronizers. This one fits right, lasts longer, and keeps your drivers moving.
| Feature |
Especificación |
| Número de parte |
AZ2210040752 |
| Product Type |
Synchronizer Cone Ring (Brass) |
| Función |
Gear Synchronization – 5th/6th Cluster |
| Material |
Phosphor Bronze (CuSn8) |
| Friction Coating |
Sintered Molybdenum Layer |
| Inner Diameter |
Ø78.5 mm |
| Outer Diameter |
Ø102.3 mm |
| Espesor |
10.2 mm ± 0.05 |
| Compatibilidad |
SINOTRUK HOWO HW19710, RT-11509C Transmissions |
| Vehicle Models |
T7H, A7, ZZ1257N3847C1, ZZ4257W3847C1 |
| OEM Standard |
Meets Q/01JZ114 & GB/T 3480-2019 |
| embalaje |
Anti-Corrosion Paper + Sealed Plastic Bag |
| Recommended With |
Shift Sleeves, Dog Teeth, Gear Oil Change |
1. TRATAMOS A CADA CLIENTE COMO NUESTRO AMIGO, PEGARSE AL PRINCIPIO: BENEFICIO MUTUO Y GANADOR ;
2. UNA VARIEDAD DE ELECCIÓN DE PRODUCTOS: CALIDAD, MARCA, EMBALAJE;
3. LE RESPONDEREMOS SU CONSULTA EN 24 HORAS.
4.Proveedor de piezas de rendimiento profesional SINOTRUCK
5. ESTAREMOS EN SERVICIO 24/24 HORAS DEL DÍA LABORAL.
6. CULO: LE OFRECEMOS EL MEJOR SERVICIO POSTVENTA.
Replacing the synchronizer cone ring requires full transmission disassembly — this isn’t a quick fix. Before installing the AZ2210040752 unit, clean all mating surfaces in the gear cluster with brake cleaner and inspect for wear on the splines and shift sleeves. The cone surface must be free from scoring or glazing; even light polishing can reduce friction efficiency. Lightly coat the brass cone ring with SINOTRUK GL-4 gear oil before seating it into the hub — never force it. Ensure proper alignment during assembly so the synchro sleeve slides smoothly over the blocker ring. After reassembly, refill with correct transmission fluid and perform a break-in cycle: drive at moderate load for 200–300 km before heavy hauling. This helps seat the new components and prevents premature wear.
