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SINOTRUK HOWO T7 TX T5G SITRAK C7 Clutch master cylinder 711W30715-6152
As the primary pressure source for the hydraulic control system in heavy-duty commercial vehicles, this clutch master cylinder is designed and manufactured to withstand the rigorous operating conditions-characterized by frequent, long-term pedal actuation-typical of trucks.
It is connected directly to the clutch pedal in the cab via a pushrod. When the driver depresses the pedal, the piston inside the master cylinder moves, converting the mechanical force into precise hydraulic pressure. This pressure drives the hydraulic fluid (clutch fluid) through high-pressure lines toward the clutch slave cylinder or booster, thereby enabling complete disengagement of the clutch and facilitating smooth gear shifts.
Troubleshooting and Technical Specifications
1. Signs of Impending Failure (Common Symptoms):
Difficulty Shifting Gears / Incomplete Clutch Disengagement: If the clutch pedal feels "soft" or "spongy" when depressed-or if shifting gears becomes difficult-it is typically due to internal leakage. This is often caused by a worn or damaged piston seal (cup seal) within the master cylinder, or by carbon deposits that cause an internal valve to seize.
Fluid Leaks at the Pedal: Inspect the area around the clutch pedal pushrod inside the cabin. If there are signs of fluid leakage, the rear seal of the master cylinder has failed. The entire unit must be replaced immediately; otherwise, the hydraulic system may lose fluid, rendering the vehicle unable to shift gears while on the road.
2. Prohibition of Mixing Clutch Fluids:
When installing a new master cylinder, ensure that the hydraulic lines are completely clean before adding clutch fluid. Never mix different grades or brands of fluid; doing so will rapidly corrode the rubber seals inside the new master cylinder, leading to premature failure of the unit.
Bill of Materials (BOM) for Sinotruk Truck Clutch Master Cylinder System
| No. | Part Number | Part Name (English) | Qty | Remarks / Application Description |
|---|---|---|---|---|
| 01 | 711W30715-6152 | Clutch Master Cylinder Assembly | 1 | Core Assembly: Primary entity. Features integrated pushrod and dust boot. Weight is approx. 1.25 kg with packaging. |
| 02 | Standard Fastener | DOT4 Brake Fluid / Clutch Oil (1L) | 1 | Mandatory Replacement: Used to flush the entire hydraulic circuit and fill the reservoir. Never reuse old oil. |
| 03 | WG9925230018 | Clutch High-Pressure Hose Assembly | 1 | Inspect Component: Steel-wire braided high-pressure hose. Replace if swelling, cracking, or surface rust is found. |
| 04 | Q700B08 | Copper Washer (Φ8) | 2 | Mandatory Replacement: Crush washers for the banjo bolt connections on the high-pressure lines. Never reuse. |
| 05 | WG9719230013 | Low-Pressure Reservoir Hose Clamp | 2 | Fasteners Kit: Secured clips for the gravity feed line connecting the fluid reservoir to the master cylinder. |
| 06 | WG9925230520 | Clutch Booster Assembly (Slave Cylinder) | 1 | Inspect Component: Located at the transmission side. If shifting remains heavy after replacing the master cylinder, this booster is often worn out. |
| 07 | Q150B0830 | Hex Head Bolt (M8×30) | 2 | Fasteners Kit: High-tensile, corrosion-resistant bolts used to secure the master cylinder body to the cab firewall bracket. |
| 08 | Q40108 / Q40308 | Flat Washer 8 / Spring Washer 8 | 2 pr | Fasteners Kit: Crucial to prevent structural loosening caused by heavy-duty commercial truck chassis vibrations. |
DETAILS
| DESCRIPTION | Clutch master cylinder | PART NUMBER | 711W30715-6152 |
| WEIGHT | 1.5kg | VOLUME |
22.0 cm × 14.0 cm × 11.0 cm |
| TRUCK MOLDE | SINOTRUK | QUALITY | Copy,High Copy, OEM,Original |
| MOQ | 1 | WARRANTY | 1 year |
| PAYMENT | TT/WESTEN UNION | SHIPMENT | by air/sea/railway |
| BRAND | SINOSACHS | PLACE OF ORIGIN | JINAN CITY,CHINA |
| STOCK | IN STOCK | APPLICABLE SITE | GEARBOX |
| PACKAGE | Carton/Woodenbox | PORT OF LANDING | Qingdao Port,China |
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