Howo Off-Highway Mining Truck Max Speed | Mining King ZZ5707S

Model prefix: ZZ5707S (Howo Mining King series, 6×4 wheel-reduction axles, dedicated mining vehicles)Key factors affecting vehicle speed: rear axle gear ratio. Two factory options available: 10.47 (standard ratio) / 8.51 (high-speed optional ratio)

1. Mainstream Models ZZ5707S3640AJ / ZZ5707S3840AJ (50-ton Mining King, most widely used)

• Engine: WD615.47, 371 hp, rated speed 2200 rpm

• Transmission: HW19710 (10 forward gears + 2 reverse gears), HW21712 12-speed gearbox optional

• Rear axle: AC26 wheel-reduction axle

  • ✅ Standard gear ratio 10.47: Officially rated maximum speed 50 km/h (ECU electronic speed limiter locked at factory). Even on flat ground with empty load, the vehicle cuts off fuel supply once reaching this speed for protection.

  • ✅ Optional low gear ratio 8.51 (customer option): Theoretical empty-load limit 57 km/h. The nameplate still marks 50 km/h. Although the mechanical upper limit is higher, most vehicles retain ECU limit of 50 km/h. Only older models without electronic speed limiting can approach 57 km/h.

• Rated payload: 50 tons, gross vehicle weight 70 tons

2. High-power version ZZ5707V3840CJ with D12.42 420 hp engine

• D12.42, 11.596L displacement, 420 hp

• Two rear axle gear ratios are also available

  • Gear ratio 10.47: Max speed 46 km/h

  • Gear ratio 8.51: Theoretical empty-load speed 57 km/h

This version delivers higher torque for heavy-load climbing. The standard-ratio variant has a lower top speed and is suitable for mines with steep slopes.

3. Important Distinction: Mining Truck vs Highway Tipper (often confused)

1. Off-highway mining truck (ZZ5707S Mining King mentioned above)

   1. Classified as off-road mobile machinery, not permitted on national highways, provincial roads or urban public roads. No highway license plates.

   2. Tires: 14.00-24 /14.00R25 heavy-duty mining tires, wheel-reduction axles, ultra-high chassis, ground clearance 340 mm.

   3. Designed for heavy payloads, climbing and impact resistance. Not built for high speed, so factory speed limit is conservative.

2. Howo NX highway 8×4 tipper (licensable for road use, NOT a mining truck)

   1. Max speed 80~85 km/h, road-going vehicle. Not suitable for heavy open-pit mining operations.

4. Actual Operating Speed on Mine Sites (Safety Regulations)

1. Flat main haulage road: ≤30 km/h (mandatory mine safety rule)

2. Curves, intersections, working faces, waste dumps: ≤10~15 km/h

3. Heavy load downhill: 5~15 km/h, coasting in neutral is prohibited

Even if the truck can reach 50 km/h, sustained speeds above 40 km/h are forbidden at mines. Braking distance is extremely long; with gross weight close to 100 tons, braking failure and rollover risks rise sharply.

5. Supplementary Notes

1. Electronic speed limiting: ECU programming is locked on new trucks. Even if you change the rear axle gear ratio, many vehicles remain capped at 50 km/h by software. Removing the speed limiter by flashing ECU is against regulations. Mine safety inspections will impose penalties. This modification greatly increases risks of tire blowout, brake failure and rollover.

2. Payload impact: Under full load, the actual maximum speed on flat ground will be 3~6 km/h lower than the empty-load mechanical limit.

3. Gradeability: Mining King maximum gradeability 42%. Top speed is sacrificed to achieve high torque, this is the design philosophy of mining trucks.

Summary Table