Electric Crab Trolley
Inside every high-performing Double Girder EOT Crane, there is one component doing the real heavy lifting — the crab trolley. Venus Engineers is a leading Electric Crab Trolley Manufacturer in Delhi, Gurgaon, NCR, and across India, supplying precision-engineered Electric Crab Trolleys for new crane installations, crane upgrades, and direct replacement applications in the most demanding industrial environments. As trusted Electric Crab Trolley Suppliers to steel plants, heavy fabrication shops, automotive facilities, and infrastructure projects nationwide, we manufacture crab trolleys with lifting capacities from 1 tonne to 100 tonnes — built to IS 3177 standards, designed in-house, and tested before dispatch. Whether you need a standard trolley for a replacement application or a custom-built unit for a specialised crane, Venus Engineers delivers a crab trolley that fits precisely, performs reliably, and lasts.
What is an Electric Crab Trolley?
An Electric Crab Trolley is the self-propelled hoist carriage that travels along the bridge girders of a Double Girder EOT Crane. It carries the hoist drum, wire rope, hook block, cross-travel motor, gearbox, and braking system as a single integrated unit — moving laterally across the crane span to position loads with precision anywhere within the crane's working envelope.
Unlike a simple hoist trolley that pushes along the bottom flange of a single girder, a crab trolley runs on rails mounted on top of the two parallel bridge girders of a double girder crane. This elevated rail position gives the crab trolley its key advantage: the hook can be positioned at a much greater height relative to the crane runway level, maximising the available lift height in the building. This is why Double Girder EOT Cranes — and by extension, Electric Crab Trolleys — are the preferred configuration for heavy-capacity, high-headroom, and high-duty-cycle industrial applications.
As specialist Electric Crab Trolley Manufacturers, Venus Engineers designs each trolley around the specific crane span, rail gauge, capacity, and duty class of the application — producing a unit that integrates seamlessly with the crane bridge structure and delivers long, trouble-free service life.
Key Components of Our Electric Crab Trolley
Hoist Drum & Wire Rope System
The hoist drum is manufactured from MS seamless pipe with double flanges and precision-machined double helical rope grooves, ensuring the wire rope spools cleanly and evenly across the full lifting height range. The rope anchoring arrangement is designed for straightforward rope replacement in the field without special tooling. Drum diameter and rope diameter are selected together based on the required capacity and rope life targets for the duty class.
Cross-Travel Drive System
The cross-travel motor and gearbox drive the trolley wheels along the crane bridge rails, moving the hoist laterally to position the load. Venus Engineers fits crane-duty squirrel cage or slipring induction motors in TEFC enclosures, rated for S4 duty at 40% CDF and 150 starts per hour — the operating regime that crab trolleys experience in real production environments. All gear boxes are helical type with fully enclosed, oil-lubricated CI or fabricated steel bodies with fine machine-cut alloy steel gears.
Braking System
The brake is a critical safety component on any crab trolley — it must hold the rated load without drift and release cleanly for controlled lowering. Venus Engineers supplies three brake configurations based on application requirements: Electromagnetic Disc Brake for fast-response, compact applications; Electromagnetic Shoe Brake for heavy-duty, high-inertia loads; and Hydraulic Thruster Brake for smooth, progressive braking in high-cycle or sensitive load handling operations.
Trolley Frame & Wheel Assembly
The trolley frame is a fabricated structural steel assembly, designed and calculated for the specific span, rail gauge, and load combination of the crane. Wheels are double-flanged, precision-machined from forged steel, and mounted on tapered roller bearings — providing smooth, quiet cross-travel and long wheel life on the crane bridge rail. Wheel diameter, flange clearance, and rail section are matched to the crane's rail specification.
Electrical Panel & Control
The crab trolley's local electrical panel houses the cross-travel and hoisting contactors, overload protection relays, and terminal blocks for integration with the crane's main pendant or remote control system. All panels are built to IP54 or IP55 protection rating as standard, with higher ingress protection available for dusty or wet environments on request.
Technical Specifications
| Parameter | Specification |
| Lifting Capacity | 1 Tonne to 100 Tonnes |
| Lifting Height | 6 Metres to 50 Metres |
| Hoisting Speed | 2 m/min to 12 m/min |
| Cross Travel Speed | 5 m/min to 20 m/min (VFD controlled) |
| Motor Type | TEFC Squirrel Cage / Slipring Crane Duty Induction Motor |
| Motor Duty | S4 Duty, 40% CDF, 150 Starts/Hour |
| Drum Type | MS Seamless, Double Flange, Double Groove with Rope Anchor |
| Brake Type | Electromagnetic Disc / Shoe / Hydraulic Thruster |
| Gear Box | Totally enclosed, helical type, oil-lubricated, alloy steel gears |
| Wheel Type | Double-flanged forged steel on tapered roller bearings |
| Hoist Configuration | Single Hoist / Twin Hoist (as required) |
| Rope Type | 6×37 or 6×19 construction IWRC wire rope |
| Hook Type | Single hook / Double hook (swivelling, forged) |
| Panel Protection | IP54 / IP55 (higher on request) |
| Structural Compliance | IS 3177, IS 4137, IS 807 |
| Power Supply | 415V, 3 Phase, 50 Hz |
Design Advantages & Performance Features
| Feature | Description |
| Single and Twin Hoist Options | Standard single hoist configuration for general lifting; twin hoist arrangement available for tandem lifting, tilt-controlled load handling, or handling long loads requiring two lift points simultaneously. |
| Helical Gear Boxes Throughout | All gear boxes in hoist and cross-travel drives are helical type — quieter, more efficient, and longer-lasting than spur gear systems, with lower heat generation in continuous operation. |
| VFD-Compatible Design | All motors and brakes support Variable Frequency Drive control for smooth, stepless speed regulation — reducing mechanical shock loads, improving positioning accuracy, and extending component life. |
| Precision Rope Grooves | Double helical grooves on the hoist drum ensure proper rope laying, preventing pile-up, cross-winding, and premature rope wear. |
| Heavy-Duty Forged Wheels | Forged steel trolley wheels with precision-machined surfaces and double flanges ensure accurate tracking on crane rails under all load and temperature conditions. |
| Overload Protection | Electronic load limiters prevent lifting beyond rated capacity, protecting the hoist, crane structure, and load from overload damage. |
| Rope Slack and Limit Protection | Upper and lower limit switches prevent rope slack during lowering and over-travel during hoisting, safeguarding the drum, rope, and structure. |
| Interchangeable with Major Crane Brands | Venus Engineers manufactures replacement crab trolleys to match the rail gauge, wheel base, and electrical interface of existing Double Girder EOT Cranes from most major Indian and international crane manufacturers |
Industries & Applications We Serve
As established Electric Crab Trolley Suppliers across India, Venus Engineers delivers trolleys to the full range of heavy industrial users in Delhi, Gurgaon, NCR, and nationwide, including:
- Steel Plants & Rolling Mills — High-duty-class crab trolleys for coil, billet, and structural steel handling cranes
- Heavy Engineering & Fabrication — Large-capacity trolleys for structural fabrication, pressure vessel, and heavy component manufacturing cranes
- Automotive & Ancillary — Medium-duty trolleys for press shop, assembly, and body-in-white EOT Crane applications
- Power & Energy — Generator and transformer handling cranes, turbine assembly bay lifting
- Shipbuilding & Defence — High-capacity twin hoist trolleys for ship block assembly and defence manufacturing
- Foundry & Casting — High-temperature environment trolleys for ladle cranes, casting bay cranes, and furnace-charging applications
- Cement & Mining — Heavy-duty replacement trolleys for process plant and maintenance cranes
- Crane OEMs & Repair Workshops — Replacement and upgrade trolleys supplied to EOT Crane manufacturers and crane repair specialists across India
Why Source Your Crab Trolley from Venus Engineers
A crab trolley is not a commodity — its geometry, wheel base, rail gauge, motor rating, brake type, and rope arrangement must all be precisely matched to the crane it will run on. As dedicated Electric Crab Trolley Manufacturers with a full in-house design and fabrication capability, Venus Engineers gets every one of these parameters right the first time — from initial measurement and drawing review through to final load testing before dispatch.
- ISO 9001:2015 Certified — Quality systems across design, component selection, fabrication, and pre-dispatch testing
- MSME Registered — Government of India recognised manufacturer
- 25+ Years of Crane Manufacturing — Crab trolley design and fabrication experience across the full capacity range
- In-house Engineering — Complete trolley design from wheel load calculation to electrical panel layout, handled by our engineering team
- Custom Rail Gauge Matching — Trolleys built to the exact rail gauge and wheel base of your existing crane structure — no field modification required
- Pre-dispatch Load Testing — Every crab trolley is function-tested and load-verified before dispatch
- Replacement Supply — Fast-turnaround replacement trolleys for breakdown situations, with priority manufacturing available for critical plant downtime
- Nationwide Delivery & Support — Electric Crab Trolleys supplied and installed across all major Indian industrial locations; AMC and spare parts available post-installation