Crane Installation and Commissioning — On-Site Service Guide

Understanding the Two Paths to Overhead Crane Installation

When your new overhead crane arrives at the factory gate, the question of who installs it becomes critical. For international B2B buyers, the choice typically comes down to two models: self-installation with remote technical support or full on-site engineer service from the manufacturer. Each path has distinct implications for your timeline, internal capabilities, and long-term reliability.

Self-installation is common in markets where local labour costs are low and your maintenance team has experience with structural steelwork and electrical systems. In this model, the manufacturer provides detailed drawings, step-by-step manuals, and remote video guidance. The key requirement is that your team must have at least one certified rigger and one licensed electrician familiar with industrial control panels. For a typical 10-ton single-girder crane with a 20-metre span, self-installation by a competent crew of four people usually takes five to seven working days.

Full on-site engineer service, on the other hand, places a Chunhua Crane technician at your facility for the entire installation and commissioning period. This is strongly recommended for cranes above 20-ton capacity, complex double-girder configurations, or when your site is in a region where local crane service expertise is scarce. The engineer brings calibrated tools, laser alignment equipment, and direct access to the factory's engineering team if unexpected issues arise. The typical duration for a standard installation with one engineer is seven to ten days, depending on site conditions.

There is also a hybrid option: self-installation of the mechanical structure (end carriages, girders, runway rails) followed by an engineer visit for electrical commissioning, load testing, and safety certification. This balances cost savings with professional oversight of the most critical phase—the electrical and control system validation.

Factory Acceptance Testing (FAT): Your Final Quality Gate Before Shipment

Before your crane ever leaves the factory in Hefei, China, it should undergo a rigorous Factory Acceptance Test (FAT). This is not merely a formality—it is your last opportunity to identify issues while the crane is still accessible to the full engineering team and spare parts inventory. For Chunhua Crane, FAT follows a documented procedure aligned with GB/T 3811-2008 (the Chinese national standard for crane design) and references key parameters from FEM 1.001 and CMAA Specification 70 for international compliance.

What a Proper FAT Includes

Visual and dimensional inspection: All structural welds are checked against ISO 5817 Class B standards. Girder camber is measured and recorded—typical specification is span/1000 for single-girder and span/1500 for double-girder cranes.
No-load functional test: All motions (hoist up/down, cross-travel, long-travel) are cycled at least 20 times to verify smooth operation, limit switch function, and brake response.
Load test at 100% rated capacity: The crane lifts and moves a calibrated test weight equal to the rated load. Deflection is measured at the centre of the girder. For a standard industrial crane, maximum allowable deflection under full load is typically span/800 for single-girder and span/1000 for double-girder (CMAA Class C equivalent).
Dynamic load test at 110% rated capacity: The crane lifts 110% of rated load and performs all motions to confirm structural integrity and brake holding capacity. This test is required by most international standards including ASME B30.2 and EN 15011.
Electrical insulation test: Megger testing of all motor windings and control circuits. Minimum acceptable insulation resistance is 1 MΩ per 1000 V of operating voltage, but we target 5 MΩ or higher.
Control system verification: All safety circuits (emergency stop, over-travel limits, phase failure relay) are tested and logged. For cranes with variable frequency drives (VFD), acceleration and deceleration ramps are set and recorded.

As the buyer, you have the right to attend the FAT in person or appoint a third-party inspector. Many project managers choose to send a senior maintenance engineer or a local consultant. If you cannot attend, request a video-recorded FAT summary showing key test results, load cell readings, and defect rectifications. A reputable manufacturer will provide this without hesitation.

What the Owner Must Prepare Before the Engineer Arrives

Whether you opt for self-installation or on-site engineer service, site preparation is the single biggest factor that determines whether commissioning finishes on schedule. A crane installation that is delayed by two weeks because of missing electrical supply or unlevel runway rails costs far more than the preparation itself.

Civil and Structural Requirements

Your runway beams and support columns must be designed for the crane's wheel loads, including dynamic factors. For a 10-ton crane with a 22.5-metre span and four wheels per end carriage, the maximum wheel load at rated capacity is typically between 6.5 and 8.5 tonnes, depending on the hoist weight and crane configuration. Your civil engineer should verify that the runway beam deflection under full load does not exceed span/600, and that column foundations are adequate for the overturning moment.

The runway rails themselves must be aligned to within ±2 mm in gauge width and ±3 mm in elevation over the entire length. If your rails are more than 5 mm out of tolerance, the crane will experience excessive skewing, wheel flange wear, and potential structural fatigue. A simple laser level or taut string line check before installation can save days of troubleshooting later.

Electrical Supply Checklist

Three-phase power supply matching the crane's voltage rating (e.g., 380V/50Hz, 415V/50Hz, or 480V/60Hz—confirm with your order specification).
Main disconnect switch and lockout/tagout (LOTO) capability within sight of the crane.
Dedicated circuit breaker sized at 1.25 times the crane's full-load amperage. For a 10-ton crane with two 7.5 kW motors, expect a main breaker rating of approximately 63A at 380V.
Earth ground resistance below 4 ohms per IEC 60364. This is critical for personnel safety and for proper operation of electronic controls.
If using festoon or conductor bar systems, ensure the installation brackets and tensioning devices are already mounted on the runway beam.

Logistics and Site Access

Confirm that the delivery truck can access the installation bay. The crane's main girder for a 20-metre span is typically 21–22 metres long and may require a low-bed trailer with escort. If your factory has a loading dock, verify that the girder can be manoeuvred inside. For very large cranes, partial assembly in the yard followed by lifting into position with a mobile crane is common—ensure the mobile crane's capacity and boom reach are adequate.

Provide a clean, dry area for storing the crane components before installation. Electrical panels and motors are sensitive to moisture. If your site is in a tropical climate, plan for indoor storage or at least weatherproof tarpaulins.

The Commissioning Checklist: Step-by-Step On-Site Validation

Commissioning is the process of verifying that the crane operates safely and correctly under real site conditions. It follows installation but precedes handover to your production team. Below is a standard commissioning checklist used by Chunhua Crane engineers for international projects. You can use this as a template for your own acceptance procedure.

Mechanical Checks

All bolted connections torqued to specification (typically grade 8.8 or 10.9 bolts for structural joints).
Girder-to-end-carriage connection bolts checked with a torque wrench. Record actual torque values.
Wheel alignment verified: skew angle ≤ 0.5 mm per metre of wheelbase.
Rail gap at expansion joints ≤ 5 mm, with rail ends bevelled at 45°.
Hoist wire rope reeving correct and rope end termination secured with at least three rope clips (or swaged fitting per manufacturer spec).
Brake adjustment: hoist brake must hold 125% of rated load without slipping. Cross-travel and long-travel brakes must stop the crane within 1.5 times the stopping distance calculated from rated speed.
Lubrication: all grease points filled, gearboxes filled to correct oil level (check sight glass or dipstick).

Electrical and Control Checks

Main power supply voltage and phase rotation verified. Phase sequence must match the crane's controller wiring.
All limit switches actuated and confirmed to stop motion in the correct direction. For hoist upper limit, the hook must stop at least 200 mm from the drum flange.
Emergency stop button tested from all operator stations (pendant, remote control, cabin if equipped).
VFD parameters loaded and verified against the motor nameplate data. Acceleration time typically set to 3–5 seconds for hoist and 5–8 seconds for travel motions.
Radio remote control (if supplied) paired and range tested. Minimum acceptable range is 100 metres line-of-sight, but real-world range inside a steel building may be 50–70 metres.
All safety relays (overload, phase failure, motor thermal protection) tested by simulating fault conditions.

Load Testing On-Site

On-site load testing is mandatory for insurance and regulatory compliance in most countries. The test sequence mirrors the FAT but uses your actual lifting conditions. You will need calibrated test weights. If you do not have them, arrange for a local testing company to supply certified weights or a load cell system. The typical cost for hiring 10 tonnes of test weights for one day ranges from $500 to $1,500 depending on your region—budget for this in your project plan.

The test procedure should include:

Lift test at 100% rated load: hold for 10 minutes at 300 mm above floor, measure deflection.
Travel test at 100% load: move the crane full length of runway in both directions, check for unusual noise or vibration.
Brake test at 100% load: emergency stop from full speed, measure stopping distance.
Lift test at 110% rated load: one complete lift and lower cycle. No permanent deformation allowed.

Document all test results with photographs and signed witness forms. These records are critical for your insurance policy and for future maintenance planning.

Operator and Maintenance Training: Who, What, and How Long

A crane is only as safe and productive as the people operating and maintaining it. On-site training is typically included in the commissioning visit, but the scope and duration vary. For a standard single-girder crane, expect:

Operator training: 4–6 hours covering start-up sequence, daily pre-operation checks, load handling techniques, emergency procedures, and shutdown. Maximum two operators per session for hands-on practice.
Maintenance training: 4–8 hours covering lubrication schedule (typically every 200 operating hours for gearboxes, weekly for wire rope), inspection points (wire rope wear limit: 10% reduction in diameter), electrical troubleshooting (how to read VFD fault codes), and spare parts identification.
Safety briefing: 1 hour covering lockout/tagout procedures, hand signals, load chart interpretation, and local regulatory requirements (e.g., OSHA 1910.179 in the US, LOLER in the UK).

For complex cranes with dual hoists, magnet or grapple attachments, or automated controls, training should be extended to two full days. Request a training manual in your local language if English is not your team's first language. Chunhua Crane provides training materials in English, Spanish, French, Arabic, and Russian for major export markets.

After training, each operator should pass a practical skills test. A simple checklist: demonstrate smooth acceleration/deceleration, accurate load placement within ±50 mm, correct use of limit switches, and proper emergency stop response. Document the test results in the crane's logbook.

Quick Reference Box: Key Takeaways for a Successful Installation

Choose wisely: Self-install saves money but requires certified riggers and electricians. Full engineer service is safer for cranes over 20 tonnes or complex configurations.
FAT is non-negotiable: Attend or request a video FAT. Verify load test results, deflection measurements, and electrical insulation values before shipment.
Site prep is your responsibility: Runway rail alignment within ±2 mm gauge, ±3 mm elevation. Earth ground below 4 ohms. Main breaker sized at 1.25x FLA.
Commissioning takes 3–5 days: Mechanical checks, electrical validation, load testing at 100% and 110%, and safety system verification. Budget for hiring test weights.
Training is included but limited: Plan for 4–6 hours operator training and 4–8 hours maintenance training. Request materials in your language.
Document everything: Torque values, deflection readings, load test certificates, training records. These protect your investment and satisfy insurance requirements.
Standards to reference: FEM 1.001 (European), CMAA 70 (American), GB/T 3811 (Chinese), ASME B30.2 (safety standard). Specify which standard your crane must meet in your purchase contract.

When you're ready, send specs on WhatsApp +86 158 5515 8769 for a detailed installation plan, FAT schedule, and site preparation checklist tailored to your factory. We also provide a free 30-minute video call to review your runway drawings and electrical supply before you place the order—no obligation, just practical engineering advice.