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- Wanda Plaza, Jinan, Shandong, China
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Superior coolant flow for heavy-duty diesel engines – The OEM D0305-1307020A Water Pump is engineered to deliver reliable, high-volume coolant circulation, preventing overheating and ensuring consistent engine temperature under extreme loads.
Designed specifically for SINOTRUK Homan trucks, this pump maintains optimal thermal balance even during long climbs or high ambient temperatures. For guaranteed compatibility and performance, always choose genuine Sinotruk Homan parts.
The D0305-1307020A water pump features a high-efficiency cast iron impeller and a double-row angular contact bearing, providing long service life and leak-free operation in the most demanding environments.
The D0305-1307020A water pump utilizes a high-flow closed impeller with optimized vane geometry, producing up to 380 L/min at rated engine speed. This ensures rapid heat transfer away from cylinder heads and liners.
Unlike aftermarket pumps with plastic impellers, this genuine SINOTRUK Homan pump features a cast iron impeller that resists cavitation and erosion even with low-quality coolant. The pump body is high-strength grey cast iron (HT250), providing excellent dimensional stability.
A precision-ground, double-row ball bearing (SKF or NSK) supports the shaft with radial loads up to 5 kN, while the carbon-ceramic mechanical seal eliminates water leaks.
8-vane cast iron impeller delivers 20% more flow than standard plastic designs, reducing hot spots and ensuring uniform cooling across all cylinders.
Double-row ball bearing pre-packed with high-temperature grease, plus a silicon carbide mechanical seal rated for 10,000+ hours of continuous operation.
Plug-and-play replacement for SINOTRUK HOWO, A7, T7H, and C7H series. Matches original bolt pattern, hose connections, and pulley offset perfectly.
| OEM Number | D0305-1307020A |
| Product Name | Water Pump (Coolant Pump, Centrifugal Type) |
| Brand | SINOTRUK Homan |
| Pump Type | Centrifugal, belt-driven with cast iron impeller |
| Max Flow Rate | 380 L/min @ 2200 rpm pump speed |
| Head (Pressure) | 12.5 m (18 psi) at rated flow |
| Impeller Material | Cast iron, dynamically balanced to ISO 1940 G6.3 |
| Number of Vanes | 8 (curved, high-efficiency profile) |
| Housing Material | Grey cast iron HT250, phosphate coated |
| Bearing Type | Double-row angular contact ball bearing (SKF/NSK) |
| Shaft Diameter | 25 mm, hardened steel |
| Mechanical Seal | Carbon vs. ceramic (leak rate ≤ 5 mL/hour) |
| Pulley Type | 8-groove poly-V (PK) or optional 2-groove V-belt |
| Flange Diameter | 145 mm (inlet), 52 mm (outlet) |
| Operating Temperature | -40°C to +120°C (coolant), up to 150°C intermittent |
| Max Continuous Speed | 5000 rpm (pump shaft) |
| Warranty | 12 months / 100,000 km (whichever first) |
| Compatible Models | SINOTRUK HOWO (WD615, WD618), A7, T7H, C7H with 6-cylinder engines |
The D0305-1307020A water pump is engineered using computational fluid dynamics (CFD) to maximize flow while minimizing cavitation. The impeller’s trailing edge geometry reduces turbulence, which translates to lower parasitic power consumption (only 2-3 kW at full load).
The pump housing incorporates a weep hole that acts as a visual leak indicator: if the mechanical seal fails, coolant will drip from the hole, warning the driver before bearing damage occurs. This safety feature is often missing on counterfeit pumps.
All critical mating surfaces are machined to within 0.05 mm flatness, ensuring a perfect seal against the engine block without excessive gasket compression.
The cast iron housing of the D0305-1307020A receives a phosphating bath and a final epoxy paint coat (150 µm thickness) that resists peeling and corrosion even with aggressive coolants.
The double-row bearing uses high-viscosity grease (Klüber ISOFLEX) that remains stable up to 160°C, while the rubber boot protects the seal from dirt. SINOTRUK Homan tests each pump for 30 minutes under hot (110°C) and cold (-20°C) cycling to verify leak-free operation.
The D0305-1307020A water pump is a direct fit for SINOTRUK HOWO, A7, T7H, and C7H models equipped with WD615, WD618, and MC11 engines. The bolt pattern matches exactly (M8×1.25, 100 mm between centers).
The pump comes with a pre-mounted pulley or accepts the original pulley (4 bolts, 85mm PCD). No modifications to the fan or shroud are required. For best performance, replace the thermostat and coolant simultaneously.
Follow these steps to install your D0305-1307020A water pump correctly: 1) Drain coolant and remove the fan shroud, fan, and drive belt.
2) Unbolt the old water pump (10 M8 bolts), clean the mounting surface with a scraper. 3) Apply a thin bead of high-temperature silicone (or use the supplied paper gasket).
4) Install the new pump, torque bolts to 25 Nm in a star pattern. 5) Reinstall pulley, fan, and belt. Tension belt to 12 mm deflection under 50N force.
6) Refill with recommended coolant (ethylene glycol 50/50), bleed air through the vent screw on the thermostat housing. 7) Start engine, check for leaks at idle and 2000 rpm.
Important: Never reuse old gaskets; always replace the coolant at the same time to prevent contamination of the new seal. Avoid overtightening pulley bolts (max 40 Nm).
The D0305-1307020A water pump requires no periodic maintenance, but early detection of failure prevents engine damage. Listen for a grinding noise near the pump – that indicates bearing wear.
Inspect the weep hole every 50,000 km: any coolant residue means the mechanical seal is failing. Also check for pulley wobble (loose bearing). If coolant temperature rises above 100°C under normal load, suspect reduced pump flow.
Common causes of premature failure: use of tap water (causes scale and seal abrasion), loose drive belt (overheats bearing), or mixing incompatible coolants. Always use distilled water with the correct antifreeze.
The D0305-1307020A water pump is manufactured in an IATF 16949 and ISO 14001 certified facility. Every pump undergoes a 100% leak test under 2.5 bar air pressure, followed by a 15-minute hot run at 3000 rpm with actual coolant to verify flow and seal integrity.
Additionally, samples from each batch are subjected to a 500-hour salt spray test (ASTM B117) and a 2000-hour endurance test on a hot test bench. The pump complies with ECE R10 (EMC) and RoHS directives.
A laser-etched batch number on the housing provides full traceability to raw material certificates. Avoid counterfeit pumps that lack this marking or have rough casting finish – they often use plastic impellers and rubber seals that fail within months.
A fleet of 280 SINOTRUK HOWO dump trucks in Indonesia’s mining sector replaced their failing aftermarket pumps with the D0305-1307020A. Over 24 months, the fleet recorded zero pump-related overheating events, and average pump life extended from 6 months to over 30 months.
Another user – a logistics company in Saudi Arabia – reported that the genuine pump maintained engine temperature below 95°C even when ambient temperatures reached 52°C. The cast iron impeller showed no erosion after 200,000 km, whereas competitors’ plastic impellers failed at 80,000 km.
Each genuine D0305-1307020A water pump is packed in a yellow-and-black SINOTRUK Homan box with foam inserts. Inside you will find the pump, a new gasket (or O-ring), and an installation instruction card.
The pump body has a high-resolution QR code and a tamper-proof hologram. Scanning the QR code opens the verification page on the SINOTRUK Homan website. Counterfeit pumps often have blurry printing and missing weep hole.
Always purchase from authorized dealers – using a fake water pump can result in catastrophic engine failure due to coolant loss or bearing seizure, which voids your engine warranty.
Summary: The SINOTRUK Homan Water Pump (OEM D0305-1307020A) delivers robust cooling performance, exceptional durability, and precise OEM fitment for heavy-duty trucks. Protect your engine from overheating – choose the genuine component trusted by fleets worldwide.
If you have any questions about our products, services, or anything related to what we offer, please don’t hesitate to leave us a message—our dedicated team is always ready to provide prompt and helpful responses to address your concerns. What’s more, when you become our valued customer, we’re delighted to offer you complimentary catalog services, giving you access to detailed, up-to-date information on our full range of products, specifications, and offerings to help you make informed decisions.
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