Introduction

Overhead crane installation succeeds or fails largely on one thing: how accurately the runway beams are aligned before the crane ever arrives. Because an overhead crane depends entirely on fixed runway beams built into a building, misalignment, incorrect gauge, or an under-rated runway can undermine even a perfectly specified crane — causing uneven wheel loading, binding during travel, or a safety issue that only shows up once the crane carries a real load.

This guide walks through the installation process for both single girder and double girder overhead cranes, from runway verification through commissioning, so plant engineers and project managers know what a correct installation actually involves.

This is article 3 of 3 in the Weiyuan Crane overhead crane series. If you’re still choosing which crane to buy, our overhead crane types and components guide (article 1) and buying guide (article 2) cover that groundwork first. Here is what you’ll learn in this one:

• Runway verification checks before the crane arrives
• The erection sequence for top-running and underhung configurations
• Electrical connection and control setup basics
• Load testing and commissioning steps before a crane goes into service

Before Installation: Runway and Structural Checks

Verify Runway Beam Rating

Confirm the runway beams are rated for the new overhead crane’s full working load — structure plus rated lift plus dynamic loading during operation — not simply that steel is present. This is the single most consequential check in an overhead crane installation, since the entire crane depends on this structure.

Confirm Runway Gauge and Alignment

Runway gauge (the distance between the two runway beams) and level alignment along their full length must match the crane manufacturer’s tolerance. Misaligned or out-of-gauge runway beams are a leading cause of uneven wheel loading and travel problems after commissioning — worth a dedicated survey before the crane’s end trucks are ever set on the runway.

Confirm Headroom Against the Crane’s Specification

Re-confirm measured headroom — the clearance between the runway beam and the highest point the hook needs to reach — against the crane’s specification sheet, particularly important where a low-headroom hoist configuration was specified to solve a tight-clearance building.

Confirm Power Supply Matches the Crane’s Electrical Rating

Voltage, phase, and frequency must match the crane’s nameplate rating before any electrical connection work begins.

Takeaway: Runway beam rating, gauge, and alignment are the checks unique to overhead crane installation — get these confirmed by survey before erection begins, since correcting them afterward is far more disruptive than for a ground-level gantry crane installation.

Erection Sequence

Step 1: Install or Verify Runway Beams

If runway beams are new construction, they’re installed and surveyed for gauge and alignment before crane delivery. If using existing beams, this verification (from the pre-installation checks above) should be complete before proceeding.

Step 2: Set the End Trucks

End trucks are set onto the runway beams — on top for a top-running configuration, or onto the bottom flange for an underhung configuration — and checked for correct travel before the bridge girder is connected.

Step 3: Lift and Connect the Bridge Girder

For a single girder overhead crane, the girder is lifted and connected between the two end trucks. For a double girder overhead crane, both girders are set and cross-braced per the structural design before proceeding — typically requiring a mobile crane or temporary lifting equipment for the connection itself.

Step 4: Install the Trolley and Hoist

With the girder connected, the trolley is installed onto the girder rail and the hoist mounted to the trolley, following the same installation-quality checks used for any wire rope or chain hoist — correct wire rope spooling, chain orientation, and torque on all structural fasteners.

Step 5: Complete Electrical Installation

Main power connection — via conductor bar, festoon cable system, or cable reel — is installed along the runway length, followed by pendant, cab, or radio remote control system wiring.

Step 6: Set Travel and Load Limits

Travel limit switches are set to the confirmed operating range at both ends of the runway, and overload protection is calibrated to the crane’s rated capacity.

Takeaway: Runway verification comes first, then end trucks, then the bridge girder, then trolley, hoist, and electrical systems — and every structural connection should be torqued and verified against the manufacturer’s specification before the crane carries any load.

Electrical and Control Setup Notes

• Grounding: confirm the crane structure and control station are properly grounded before energizing.
• Overload protection: verify overload protection is active and correctly calibrated to the crane’s rated lifting capacity before commissioning.
• Runway conductor alignment: confirm the conductor bar, festoon, or cable reel system runs cleanly along the full runway length without binding or excessive slack.
• Emergency stop: confirm the emergency stop function halts all crane motion immediately and holds the load, before any load testing begins.

Takeaway: Grounding, overload protection, and emergency stop function are non-negotiable checks — confirm each one is working correctly before any load is placed on the crane.

Load Testing and Commissioning

No-Load Function Test

Run the crane through a full hoist, trolley, and bridge-travel cycle with no load, confirming smooth operation across the full runway length and correct function of all limit switches.

Rated-Load Test

Test the crane at its full rated capacity across representative points of the runway — not just at one position — confirming consistent performance and correct brake holding when the control is released.

Overload Protection Verification

Following the manufacturer’s documented commissioning procedure, confirm overload protection engages correctly at the specified threshold.

Wheel Load Verification

Confirm loading is even across all end-truck wheels under rated load — uneven loading indicates a runway alignment issue that should be corrected before the crane enters regular service.

Documentation

Record all commissioning results — load test outcomes, limit switch settings, runway survey data, and any adjustments made — as part of the facility’s equipment maintenance record.

Takeaway: An overhead crane isn’t ready for production use until it has passed a no-load test, a rated-load test across the full runway, overload protection verification, and confirmed even wheel loading — all documented as a maintenance baseline.

Frequently Asked Questions

Q: What’s the most important pre-installation check for an overhead crane? Confirming the runway beams are rated for the crane’s full working load and correctly aligned to the manufacturer’s gauge and level tolerance. Because the entire crane depends on this structure, an under-rated or misaligned runway is both the most serious and most disruptive-to-correct installation issue.

Q: How is overhead crane installation different from gantry crane installation? An overhead crane’s installation centers on verifying and, where needed, upgrading the building’s existing runway beams. A gantry crane’s installation centers on preparing the crane’s own ground-level foundation and rail or paved surface, since it doesn’t depend on building structure at all.

Q: What causes uneven wheel loading on an overhead crane? Most commonly, runway misalignment or incorrect gauge — this is why a runway survey before erection, and a wheel-load verification during commissioning, are both essential steps.

Q: Can an existing runway be reused for a new, higher-capacity overhead crane? Only if a structural assessment confirms it’s rated for the new crane’s full working load — reusing existing runway beams without this verification is a common and serious installation error.

Q: How long does an overhead crane installation typically take? This varies by crane size and whether new runway construction is required — building new, rated runway steel often takes longer than the crane erection itself, so runway work should be scheduled well ahead of crane delivery.

Q: What documentation should we keep after installation? Commissioning test results (no-load and rated-load tests across the runway), limit switch and overload protection settings, and the runway structural verification and alignment survey — this record supports both compliance requirements and future maintenance planning.