Mobile Crane Repair, Inspection and Servicing

Carrier faults versus lifting-system faults

Machine type and use

This page covers wheeled mobile cranes such as all-terrain, rough-terrain and truck-mounted cranes. They are used for erection, plant maintenance and material lifting. Carrier layout, steering, suspension and boom-extension design vary. Pick-and-carry and crawler cranes have dedicated guides because their service requirements differ.

Before the first technical call

Use separate descriptions for carrier and upper structure. Give the exact warning text, the selected operating mode and which functions remain available. For telescope problems, describe which extension stage or sequence stops if known; do not dismantle or manually override the mechanism to identify it.

Planning carrier and superstructure repairs

A site visit can resolve many accessible service and control faults once the correct parts and diagnostic tools are available. Carrier transmission work, major telescope repairs and slew-bearing replacement need suitable dismantling and handling arrangements. The fact that a crane can drive does not establish that it is fit to lift. Conversely, a serviceable upper structure does not resolve a carrier braking or steering defect. Define the release criteria for both systems that were affected.

Servicing and condition inspection

Maintain the carrier and crane superstructure according to their respective schedules. Track rope and sheave condition, boom lubrication, outrigger condition, oil/filter service and safety-device faults. A warning must be investigated rather than cleared repeatedly. Nominal capacity does not replace the applicable load chart.

Inspection areas to include

• Telescopic boom sections, extension mechanism, wear pads, pins and cylinders as applicable.
• Hoist rope, sheaves, winch, hook, slew system and brakes.
• Outrigger beams, cylinders, holding circuits and fitted position sensors.
• Carrier engine, transmission, axles, tyres, steering and suspension; crane controls, indicators and limit devices.

What the inspection or repair report should record

Ask for a report that separates carrier defects, lifting-system defects and documentation gaps. For load-system work, record what was checked and whether calibration was included. For a used-crane inspection, visible condition and operational checks should be separated from internal component condition that could not be established without dismantling.

Condition inspection and formal examination

For a mobile crane working on a construction site, identify the upper lifting structure, lifting accessories and any relevant erection or repair history. As of 26 October 2026, the OSH Central Rules 2026 have superseded the BOCW Central Rules 1998. Historically, BOCW (RECS) Central Rules 1998, Rule 56 required competent-person testing and examination before first use at the site, after alterations or repairs liable to affect strength or stability, and after erection; testing and examination at least every five years; and thorough examination at least every twelve months. For current work, establish the applicable central or state rules, saved provisions and examination schedule under the OSH framework. At mines, follow the relevant DGMS requirements. A service inspection is a condition report; it is not the competent-person examination or certificate.

Manufacturer examples and machine identification

Manufacturer examples include Liebherr, Tadano, SANY, ACE, TIL, Kato, Grove, XCMG and Zoomlion. Truck-mounted, rough-terrain (RT) and all-terrain (AT) cranes have different carrier, suspension and travel arrangements. Some cranes have separate carrier and superstructure power systems. Provide each relevant identification plate and the fitted boom configuration. Manufacturer names identify equipment; no OEM affiliation is implied.

Planning service for an Indian project

For cranes moving between Indian projects, distinguish the depot address from the actual breakdown location and access route. Include road recovery needs, site lifting restrictions and the shutdown window. Rental and pre-deployment inspections should check that the physical configuration and documentation match. Truck-mounted, rough-terrain and all-terrain are useful distinctions; 'mobile crane' alone is not enough to select a carrier specialist or a diagnostic system.

Matching truck and crane specialists

The job may need a commercial-vehicle/industrial diesel specialist, a crane hydraulic mechanic, and a load-system technician. Their skills are complementary. Outrigger controls, telescope sequences and lifting limits require knowledge of the exact crane family.

Equipment to arrange for the work

• Model-compatible diagnostics for the carrier and crane systems, which may be separate.
• Rated hydraulic test instruments and electrical measuring tools.
• Rope/wear measurement, torque tools and approved boom-support or component-lifting equipment.
• Manufacturer-prescribed calibration resources or specialist structural assessment equipment where necessary.

Before maintenance starts

Never bypass a load moment system or work under an unsupported boom or outrigger assembly.

Frequently asked questions

Information to prepare for a repair or inspection enquiry

• Crane type, make/model, serial number and carrier/superstructure identification.
• Affected carrier or upper function, exact fault codes and existing photographs or safely recorded video.
• Operating hours, mileage and recent service or repair history for the affected system.
• Site location, boom/outrigger position, ground conditions and access constraints.
• Required visit window and available recovery, component-lifting and workshop resources.

Need a mechanic or an inspection?

Send the machine make and model, site location and symptoms through the Mech On Site contact page. Include the service or inspection you need and any fault codes or existing photographs.