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Precision drive belt for generator & alternator systems – The OEM 150-3701040B Generator Belt (17×360) is engineered to deliver consistent power transmission from the crankshaft to the alternator, ensuring proper battery charging and electrical system stability. Manufactured from high‑strength rubber with polyester cord reinforcement, this belt resists stretching, cracking, and heat ageing. For guaranteed compatibility and performance, always choose genuine Sinotruk Homan parts.
The 150-3701040B generator belt features a 17 mm top width and 360 mm effective length (17×360), fitting a wide range of SINOTRUK Homan alternator drives. Its fibre‑loaded rubber compound provides excellent resistance to oil, heat, and ozone, ensuring long service life in harsh engine bay environments.
The 150-3701040B generator belt (17×360) is a V‑ribbed belt (classic V‑belt profile) designed specifically for driving the alternator (generator) on SINOTRUK Homan diesel engines. Its 17 mm top width and 360 mm effective length ensure perfect fitment on the crankshaft and alternator pulleys without slipping or excessive tension. The belt is constructed from a high‑quality ethylene propylene diene monomer (EPDM) rubber compound, which offers superior resistance to heat, ozone, oil, and coolant compared to conventional neoprene belts.
The strength member is made from polyester cord that is heat‑stabilised and tensioned during manufacturing to eliminate initial stretch. This ensures that the belt maintains proper tension over its service life, reducing the need for frequent retensioning. The belt also features a specially designed fabric cover on the top and bottom that resists cracking and abrasion, prolonging service life even in dusty environments.
A failing generator belt can cause the alternator warning light to illuminate, battery undercharging, and eventual engine stalling due to voltage drop. The genuine SINOTRUK Homan 150-3701040B belt is 100% factory‑tested for dynamic strength, elongation, and heat resistance, giving you confidence in its reliability.
EPDM rubber withstands engine compartment temperatures up to 120°C and resists oil, coolant, and ozone cracking.
Heat‑treated polyester tensile cord eliminates initial stretch, maintaining stable tension and preventing belt slip.
17 mm top width, 360 mm effective length, 8 mm height – exact OEM fit for SINOTRUK Homan alternator drives.
| OEM Number | 150-3701040B |
| Product Name | Generator Belt (V‑belt, 17×360 mm) |
| Brand | SINOTRUK Homan |
| Top Width (W) | 17 mm ±0.5 mm |
| Effective Length (Le) | 360 mm ±2 mm |
| Belt Height (H) | 8 mm ±0.3 mm |
| Material | EPDM rubber with polyester tensile cord |
| Tensile Strength | ≥ 8.5 kN |
| Elongation at Break | ≤ 12% |
| Operating Temperature Range | -40°C to +120°C |
| Standards | ISO 4184, SINOTRUK Homan Q/SQ 1045 |
| Service Life (typical) | > 80,000 km or 2,000 hours |
| Applications | SINOTRUK HOWO, A7, T7H, C7H alternator/generator drives |
| Compatible Models | WD615, WD618, MC11, MC13 engines with 17×360 belt spec |
The 150-3701040B generator belt is manufactured using a high‑precision multi‑ribbed moulding process that ensures consistent cross‑sectional geometry. The EPDM rubber is compounded with anti‑oxidant and anti‑ozonant additives to resist cracking in hot, dirty engine bays. The polyester tensile cords are pre‑stretched during manufacturing to eliminate initial take‑up stretch, meaning the belt will not need retensioning after a few hours of operation.
The belt’s sidewalls are textured to improve grip and reduce slippage, especially during cold starts when belt friction is lower. The fabric cover is specially treated to resist abrasion from pulley wear and to reduce noise during operation. Unlike aftermarket belts that often use low‑grade rubber that hardens and cracks within a year, the genuine SINOTRUK Homan belt remains flexible for years, delivering consistent alternator drive performance.
Each belt is 100% inspected for length, width, and angle, and randomly sampled for dynamic endurance testing (1,000 hours at rated tension and speed). The belt meets or exceeds ISO 4184 and SINOTRUK Homan engineering standard Q/SQ 1045. A batch number printed on the belt provides traceability.
The EPDM rubber compound used in the 150-3701040B belt is formulated to withstand continuous exposure to under‑hood temperatures up to 120°C, with short‑term peaks to 150°C. It is also highly resistant to engine oil, coolant, and diesel fuel splashes, which would quickly degrade conventional neoprene belts. The belt retains its flexibility down to -40°C, ensuring reliable power transmission even in arctic conditions.
The polyester tensile cords have a very low stretch coefficient (less than 0.5% after 100 hours of operation), maintaining correct alternator drive belt tension without frequent adjustments. This reduces the risk of belt slip at high engine speeds, which can cause alternator output voltage drops.
Installing the 150-3701040B generator belt is straightforward: release the alternator tensioner, remove the old belt, route the new belt around all pulleys (crankshaft, alternator, and any idler), then apply tension by moving the alternator outward until the belt deflection is correct (typically 8‑10 mm per 100 mm span). Torque the mounting bolt.
The belt is compatible with original alternator pulleys and does not require any modifications. Before installation, inspect all pulleys for wear, damage, or misalignment. Replace any worn pulleys to ensure maximum belt life.
1) Disconnect the battery negative terminal for safety. 2) Locate the alternator mounting bolts and the adjusting link. 3) Loosen the mounting bolts and pivot the alternator inward to release belt tension.
4) Remove the old belt and inspect it for signs of cracking, glazing, or cord separation. 5) Clean all pulley grooves with a wire brush; remove any debris or old belt particles. 6) Route the new genuine 150-3701040B belt around the pulleys, ensuring it sits correctly in each groove.
7) Pivot the alternator outward to apply tension. The belt should deflect 8‑10 mm when a moderate force (approx. 50 N) is applied midway between the crankshaft and alternator pulleys. 8) Tighten the mounting bolts to the specified torque (typically 40 Nm) and recheck tension after the engine has run for 5 minutes.
The 150-3701040B generator belt requires regular inspection every 20,000 km. Signs of wear include cracking on the inner surface, glazing (shiny sidewalls), or visible cord separation. If any of these are present, replace the belt immediately to avoid alternator failure.
Common causes of premature belt failure: incorrect tension (too tight → bearing damage; too loose → slipping and glazing), misaligned pulleys, or oil/coolant contamination. Always resolve the root cause before installing a new belt.
Never reuse a removed belt – once a belt has taken a set, it will not perform correctly. Replace the belt every 80,000 km or during major engine overhauls as preventive maintenance.
The 150-3701040B generator belt is manufactured under IATF 16949 and ISO 14001 certified systems. Each belt is 100% inspected for length and width, and randomly sampled for dynamic endurance (1,000 hours at 8000 rpm, 120°C), heat ageing (168h at 120°C), oil immersion (48h in engine oil at 100°C), and tensile strength testing.
The belt meets ISO 4184 (classic V‑belts) and SINOTRUK Homan engineering standard Q/SQ 1045. A batch number printed on the belt provides full traceability. Counterfeit belts often have rough edges, inconsistent cross‑section, or a strong chemical smell (genuine EPDM has a mild odour). Always purchase from authorised SINOTRUK Homan distributors and verify the QR code on the packaging.
A fleet of 400 SINOTRUK T7H trucks in the Middle East (high ambient temperatures, dusty conditions) replaced generator belts every 30,000 km with aftermarket units due to cracking and glazing. After switching to the 150-3701040B genuine belt, belt life increased to an average of 95,000 km, and alternator failures due to undercharging dropped by 80%.
Another user – a logistics company in Canada – reported that the genuine belt remained flexible and crack‑free after two harsh winters (-40°C), while competitors’ belts had become brittle and failed. The fleet reduced roadside breakdowns by 90% after standardising on SINOTRUK Homan belts.
Each genuine 150-3701040B generator belt is packed in a sealed plastic bag inside a SINOTRUK Homan branded carton. The box includes a QR code, a hologram sticker, and an instruction card. The belt itself is printed with the OEM number and a batch code.
Counterfeit belts often have a shiny, over‑glazed surface, missing print, or a coarse fabric texture. The genuine belt has a matte finish, a crisp moulded print, and a slight flexibility that springs back when bent. Always scan the QR code before installation. Using a fake belt can lead to alternator undercharging, battery failure, and sudden belt breakage – potentially causing engine overheating if the water pump is also driven by the same belt.
Summary: The SINOTRUK Homan Generator Belt (OEM 150-3701040B 17×360) delivers durable, heat‑resistant, and precise power transmission for alternator systems. Ensure reliable battery charging – choose this genuine component trusted by fleets and mechanics worldwide.
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