Case Study: 85-Ton Heavy Machinery Mobilization

The Constraint: Weight Limits, Over-Dimension Clearances, and Bridge Gates

When an international EPC joint venture broke ground on deep foundation works in central Jakarta, their heavy crawler excavators arrived at Tanjung Perak Port in Surabaya on a tight delivery window. Each fully dressed excavator weighed 85 metric tons with track shoe widths exceeding 4.2 meters and an operational boom assembly that rendered standard 3-axle flatbeds and lowboys structurally unusable.

The route connecting East Java to Jakarta spans nearly 780 kilometers of national highway and Trans-Java tollway. Moving loads exceeding Class I highway design tolerances requires addressing three critical statutory and physical bottlenecks:

• Axle Load Ceilings (Muatan Sumbu Terberat - MST): Indonesian highway regulations enforce a maximum single-axle load limit of 10 tons on primary national corridors. Concentrating an 85-ton static mass over standard axles risks severe bridge deflection, road pavement shearing, and immediate impoundment by provincial transport departments (Dishub).
• Toll Plaza Overhead Gantries: While toll roads provide uniform grades and reduced transit times, automated toll plazas (Gerbang Tol) and electronic message boards across Central Java restrict vertical clearances to between 4.8 and 5.0 meters. The crawler chassis height mounted on standard trailers exceeded safe clearance envelopes.
• Congested Metropolitan Ingress: Final site positioning required transitioning off tollways into dense municipal Jakarta streets during narrow nighttime delivery windows with overhead municipal utility lines and zero turning radii at urban intersections.

The Plan: Multi-Axle Distribution, Height Drops, and Advance Survey Sweeps

DSK Logistics dispatched an advance route engineering survey team 10 days prior to ship berthing. Driving the full 780 km route with high-precision digital height poles and laser rangefinders, our surveyors cataloged every overhead bridge, power line sag, toll gantry, and weigh station bypass.

To address the structural challenges, our heavy-transport engineering department developed a customized haulage plan:

To negotiate low overhead gantries, the crawler counterweights and primary digging arms were demounted under supervised harbor crane rigging in Tanjung Perak and dispatched on dedicated support flatbeds. The main superstructure was seated in an ultra-low well-deck configuration providing ground clearance of just 300 mm, successfully keeping the total transport height below 4.45 meters.

All statutory heavy transport permits (Izin Angkutan Alat Berat & Dispensasi Jalan) were secured in advance through the Directorate General of Land Transportation and Korlantas Polri, scheduling an official high-speed escort unit (Patwal) for 24/7 convoy separation.

The Execution: High-Precision Night Staging and Continuous Telematics

Mobilization commenced from Jamrud Terminal at Tanjung Perak Port following rigorous safety lashing verification. DSK certified riggers utilized Grade 100 heavy-duty lashing chains and ratchet load binders rated to twice the cargo dynamic force vector, ensuring total lateral stability during acceleration, braking, and banking curves.

The journey was executed in deliberate night stages between 21:00 and 05:00 WIB to minimize interference with regular public highway traffic:

• Night 1 (Surabaya to Ngawi): Convoy cleared eastern Java industrial corridors and entered the Trans-Java tollway at Mojokerto with escort cruisers establishing a rolling 300-meter security zone ahead and behind the trailers.
• Night 2 (Ngawi to Semarang): Navigated Central Java tollway transitions with manual toll booth overrides arranged in advance through regional toll operators (Jasa Marga), clearing oversized manual gate lanes without stopping.
• Night 3 (Semarang to Cirebon): Maintained steady cruising speeds of 40–45 km/h across the north coast corridor. At designated rest areas, DSK technical crews conducted thermal inspections of wheel hub bearings, hydraulic pressure lines, and lashing chain tensions.
• Night 4 (Cirebon to Central Jakarta Job Site): Reached outer Jakarta toll ring before 02:00 WIB. DSK sweeper teams in elevated boom bucket trucks guided the convoy under municipal telecom and power lines along urban arterials directly to the contractor’s construction staging gates.

Throughout the 96-hour mobilization window, DSK Journey Management Control logged GPS breadcrumb intervals every 60 seconds, streaming live speed, position coordinates, and dashcam feeds directly to the client's procurement and logistics steering committee.

The Outcome: Zero Damage, Zero Incident Record, and Ahead of Schedule

Both 85-ton crawler excavators arrived at the Jakarta infrastructure site in flawless condition, ready for re-assembly and immediate commissioning. Key performance metrics achieved:

By avoiding costly equipment disassembly at the port and mitigating highway structural risks through engineered multi-axle trailers, the contractor saved an estimated 25% in heavy crane handling fees and avoided potential multi-week delays.