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Crab Unit Assembly

Complete cross-travel trolley (crab) for double-girder cranes: fabricated frame, hoisting winch with machined drum, CT drive, and full electricals — assembled, tested and ready to drop onto your bridge rails. 5 to 200 Ton.

Capacity	5 – 200 Ton
Rail Gauge	1.6 – 3.5 m (as per bridge)
Hoist Speed	1.5 – 8 m/min
CT Speed	15 – 20 m/min
Reeving	4/2 · 8/2 true vertical lift
Drum	Machined, grooved, seamless
Frame	Stress-relieved fabrication
Brakes	Twin hoist brakes optional
Standards	IS:3177 · FEM 1.001

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Technical Details

Built To Standard, Tested Beyond It

WheelForged EN-8, double flanged

GearboxHelical, oil bath

Rope6×36 IWRC, FoS 5:1

Hook BlockForged, swivel, latch

PanelMounted & wired on frame

TestingNo-load run + load test

FrameStress-relieved fabricated structure

CT DriveVFD anti-derailment control

The ETC Quality Promise

125% SWL load test before every dispatch, documented & stamped
IS:2062 tested plates with mill certificates on file
IS:3177 / IS:4137 / FEM 1.001 compliant design calculations
Stress-relieved fabrication at critical welded joints
ISO 9001:2015 certified manufacturing process

About This Product

Engineered For Indian Industry

The crab is the business end of a double-girder crane — winch, trolley and controls in one rigid frame. ETC crabs arrive as a complete tested unit: winch aligned, wheels gauged to your bridge rails, panel wired, so site work reduces to lifting it onto the rails and connecting power.

True vertical lift reeving (4/2 or 8/2) keeps the hook plumb through the full lift, critical for die handling and precision erection. Twin hoist brakes and duplicated limit switches are available for foundry and critical-lift duty.

Old crab beyond repair?

Share rail gauge, capacity and lift — we build a drop-in replacement crab for any make of crane.

Key Features

Fully pre-assembled — drop-on installation
True vertical lift — 4/2 & 8/2 reeving
Machined drum — maximum rope life
Twin brake option — for critical lifts
Gauged to your rails — zero site adjustment
Replacement crabs — for cranes of any make

Applications

Where This Machine Earns Its Keep

Steel & Rolling Mills

Billet handling, coil movement and furnace charging in continuous duty cycles.

Fabrication Workshops

Positioning heavy weldments and machined assemblies with precise inching control.

Foundries & Forging

Ladle handling and die movement engineered for heat and dust environments.

Warehousing & Logistics

Fast, safe loading and unloading across storage bays and dispatch yards.

Infrastructure Projects

Precast segment and girder erection at bridge, metro and dam sites.

Power & Energy Plants

Turbine hall maintenance cranes built to strict duty classifications.

Safety First

Safety Features As Standard

Overload Limiter

Electronic load cell cuts hoisting the moment load exceeds rated SWL.

⬆ Upper/Lower Limit Switches

Rotary geared and counterweight limits stop hook over-travel in both directions.

Motion Warning Hooter

Audible alarm and flasher warn floor staff during LT/CT travel.

Fail-Safe DC Brakes

Electromagnetic brakes engage automatically on power failure — load holds instantly.

Pendant + Radio Remote

IP-65 push-button pendant with optional wireless remote and emergency stop.

Panel Protection

SPP, overload relays and single-phase preventers protect motors and VFDs.

FAQ

Questions Buyers Ask Us

We build crab units from 5 to 200 Ton, with rail gauges from 1.6 to 3.5 metres matched to your bridge. Every unit is designed to IS:3177 / IS:4137 and FEM 1.001 duty classifications, and custom capacities are engineered on request.

Yes, every crab unit is gauged to your specific rail centre distance and wheel-flange profile — share your rail drawing and we'll match it exactly.

In most cases, yes — our team can inspect your bridge girder and wheel track to confirm compatibility before supplying a drop-in replacement crab.

A complete cross-travel trolley: stress-relieved fabricated frame, hoisting winch with machined drum and gearbox, CT drive wheels, hook block, brakes, limit switches and panel — assembled, wired and trial-run before dispatch.

Guide rollers and machined double-flanged wheels keep the crab tracking true on the bridge rails, with end stops and buffers at both rail ends. On longer bridges the CT drive runs through a VFD so starts and stops are gradual, which protects both the rails and the load.

Every unit runs a no-load trial for gearbox backlash, brake response and limit-switch operation, then a load test at 125% of Safe Working Load, witnessed and documented with a stamped certificate.

A fail-safe DC electromagnetic disc brake on the motor is standard. For foundry, molten-metal or other critical duty we fit duplicated braking, so either brake alone can hold the rated load.

Crabs are engineered from 5 to 200 Ton with rail gauges from 1.6 to 3.5 m, matched exactly to your bridge girder centres and the duty classification of the crane it will run on.

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