Analisis Pembebanan Dump Truck Shacman F3000 8x4 Eps. 3 - Serial Analisis Pembebanan Alat Angkut

Summary

The presenter demonstrates how to estimate the load and axle distribution of a Shacman F3000 8×4 dump truck, then compares the results with the truck’s stated weight and axle limits. The calculation is presented as an example that can be adapted to other dump-truck models.

1. Establish the truck’s weight limits and empty weight

The truck’s specifications list the following axle capacities:

• Front: 2 × 9.5 tonnes = 19 tonnes
• Rear: 2 × 16 tonnes = 32 tonnes

The presenter uses the combined axle capacity of 51 tonnes as the truck’s gross vehicle weight (GVW), although the specifications do not explicitly state a GVW.

The quoted cab-and-chassis mass is 19.5 tonnes, including a 5-tonne dump body. The presenter therefore treats the cab and chassis as 14.5 tonnes. For the example, the cab and chassis and the body are each assumed to be split equally between the front and rear axles:

• Cab and chassis: 7.25 tonnes per end
• Dump body: 2.5 tonnes per end

2. Estimate the coal payload

The example uses the body’s internal dimensions and adds 0.1 m above its sides to represent a typical raised load profile. Coal density is assumed to be 0.9 tonnes/m³.

The payload is calculated using:

Payload = density × length × width × load height

Using the dimensions in the calculation, the estimated coal payload is approximately 44 tonnes.

The subtitles give inconsistent body dimensions: they mention a width of 2.2 m but use 2.5 m in the payload calculation. The stated 44-tonne result matches a calculation using 8.5 × 2.5 × 2.3 m at 0.9 tonnes/m³.

3. Distribute the payload across the axles

The presenter models the truck as a supported beam, with reactions at the front and rear axles, and assumes the payload’s center of gravity is at the center of the dump body.

• Distance between the front and rear reaction points: 6.175 m
• Payload center from the rear reaction point: 1.525 m

The calculation uses static equilibrium:

• Vertical forces must balance: front reaction + rear reaction = payload
• Moments about the rear reaction point are used to calculate the front reaction.

The resulting payload distribution is approximately:

• Front: 11 tonnes
• Rear: 33 tonnes

4. Add occupants and accessories

The example assumes 0.2 tonnes for two people and accessories in the cab. This weight is assigned to the front axle because the cab is above the front wheels. The presenter says the occupants could be the operator and either a trainer or a mechanic.

5. Calculate total load and compare it with the limits

Adding the assumed empty-vehicle weights, payload, occupants, and accessories gives:

• Front total: 7.25 + 2.5 + 11 + 0.2 = 20.95 tonnes
• Rear total: 7.25 + 2.5 + 33 = 42.75 tonnes
• Overall total: 63.7 tonnes

Compared with the assumed 51-tonne GVW, the truck is 12.7 tonnes over, or approximately 25%. The presenter says this is within a manufacturer-stated 30% overload tolerance.

The presenter also compares the axle loads with the 19-tonne front and 32-tonne rear capacities. Applying a 30% tolerance gives approximate limits of:

• Front: 24.7 tonnes
• Rear: 41.6 tonnes

The front load is within that limit, while the calculated rear load of 42.75 tonnes exceeds it. The subtitles later describe the rear excess using rounded figures and also refer to an engineering tolerance, so the exact margin is inconsistent in the source. Despite this, the presenter concludes that the example is acceptable for operation.

Main lessons

• A truck can be within an overall overload allowance while still having a concerning front-to-rear load distribution.
• Payload estimates depend on accurate internal body dimensions, load height, and material density.
• Axle loads can be estimated using equilibrium and moment calculations, but the results depend on assumptions about vehicle weight distribution and the payload’s center of gravity.
• The presenter warns that overloading, combined with excessive speed or steep grades, can contribute to accidents.
• A calculation application is promised for a later video. Users would enter truck dimensions, GVW, and the applicable overload tolerance.

Speakers and sources featured

• Presenter/narrator: A single host from the Time Cool Lapse mining channel; no other audible speakers are identifiable in the subtitles.
• Shacman manufacturer information: Specifications and a manufacturer statement about overload tolerance are quoted by the presenter but are not independently verified in the subtitles.