Wheels and end carriages
Carry the crane bridge and transfer vertical and horizontal loads into the runway rail.
Check: wheel diameter, material, hardness, profile, bearing, wheelbase, drive layout and spare support.
For maintenance engineers, buyers and project teams
EOT Crane Wheels, Rails and Alignment Guide
Wheel wear, bridge skew and noisy travel are rarely just "wheel problems." They usually come from the full travel system: end carriages, wheels, rails, runway beams, drives, brakes, buffers and alignment evidence.
Quick answer
Before buying or repairing crane wheels, check the cause of wheel wear. Confirm wheel load, wheel material and hardness, wheel profile, rail section, rail alignment, diagonal measurements, drive synchronization, brake drag, bearing condition, buffer condition and runway scope. Replacing wheels without this check often only resets the failure clock.
Travel system map
Do not evaluate wheels, rails and end carriages separately
A low-price crane can become expensive if wheel loads are missing, rails are assumed, or alignment is not accepted with records. Use this page as the system-level checklist before going into each detailed guide.
Rails and runway beams
Provide the track the crane actually runs on. Poor rail fit can damage even a correctly built crane.
Check: rail section, clips, joints, grout/pads, end stops, runway beam interface and alignment record.
Alignment and drive behavior
Controls skew, crabbing, flange wear, motor trips and travel noise during long travel.
Check: gauge, level, diagonal, straightness, brake drag, motor synchronization and wheel diameter matching.
Inspection workflow
A practical sequence when wheels are wearing fast
Look for flange wear, tread wear, one-side rubbing, joint impact marks or heat marks.
Measure rail gauge, level, straightness, joints, clips, end stops and obstruction points.
Verify diagonal, wheelbase, wheel alignment, wheel diameter match and end carriage squareness.
Inspect motor current, gearbox condition, brake drag, synchronization and control behavior.
Buyer and RFQ controls
What to ask suppliers before PO release
| Area | Ask the supplier to state | Why it matters | Red flag |
|---|---|---|---|
| Wheel load schedule | Maximum/minimum wheel loads, wheel spacing, impact basis, horizontal load assumptions and crane self-weight. | Needed for runway, rail and civil interface decisions. | Only SWL and span are quoted. |
| Wheel details | Diameter, tread/profile, material, hardness, bearing arrangement, lubrication and replacement part codes. | Determines rail fit, wear life and serviceability. | "Standard forged wheel" with no data. |
| End carriage design | Wheelbase, drive arrangement, motor/gearbox make, buffer mounting, alignment method and access for replacement. | Controls skew, maintenance access and travel reliability. | End carriage omitted from BOM detail. |
| Rail and runway scope | Rail section, clips, pads/grout, joints, end stops, survey, correction and acceptance responsibility. | Prevents disputes where crane supplier blames civil/runway scope later. | Rail installation assumed by buyer. |
| Commissioning records | Rail gauge/level, bridge diagonal, wheel alignment, brake setting, travel limit and no-load/load travel checks. | Creates evidence that the crane was accepted in controllable condition. | No alignment report at handover. |
Symptoms and likely checks
Use symptoms to choose the right next guide
Flange wear on one sideStart with rail alignment, bridge skew, wheel profile and diagonal checks.
Impact noise at fixed pointsInspect rail joints, clips, rail head damage, runway support and wheel tread chipping.
Bridge crabbing or skewCheck drive synchronization, brake drag, wheel diameter mismatch and rail gauge variation.
Long-travel motor tripsCheck friction, alignment, brake release, gearbox condition, current balance and VFD/contactors.
Runway design uncertaintyUse preliminary wheel load estimates, then request certified vendor load data and load combinations.
End impact or buffer damageCheck travel limits, approach speed, buffer rating, end stops and collision assumptions.
Related tools and guides
Continue with the detailed wheel, rail and runway resources
Engineering boundary: This guide is for procurement clarification, maintenance triage and preliminary review. Final wheel loads, wheel design, rail selection, runway alignment tolerance, structural adequacy and return-to-service decisions must be confirmed by qualified engineers and site-specific standards.
Next action
Do not replace wheels until the travel system is checked
Use the wheel-load calculator, ask for rail and end carriage details in the RFQ, and record alignment evidence before final acceptance or repeated wheel replacement.