UNIC URW-506 Mini Spider Crane

Model URW-506 | 3.0t × 3.4m (4.0t × 2.5m with 5-fall block) | 1.4m Width | 16m Lift Height | Diesel + Optional 400V Electric | Working Area Limitation Standard

The UNIC URW-506 offers an optimal combination of working flexibility and heavy lifting power. This crane is capable of lifting 3 tonnes at 3.4m, or up to 4 tonnes with an optional 5-fall hook block (URW-506-1). As with all UNIC spider crane models, the URW-506 carries a safe load indicator, and its working area limitation device — fitted as standard — allows the operator to pre-define the working area, giving greater control and safety in sensitive environments. On approaching the defined limits, function speeds are reduced and an audible alarm is given before operation stops.

Technical Specifications

Specifications above are taken from the UNIC manufacturer's spec sheet at standard configuration. Variants with electric, LPG or other options may differ slightly — full rated capacity charts supplied with each hire.

Key Features

• 3 tonnes at 3.4m radius — or 4 tonnes at 2.5m with optional 5-fall hook block (URW-506-1)
• Working area limitation as standard — pre-define safe zones with speed reduction and audible alerts
• 6-section hydraulic boom — telescopes to 15.71m for a 15.52m working radius
• Onboard or radio remote control — with optional digital feedback display variant
• Dual power option — diesel with optional 400V mains electric — zero length increase
• 700kg fly jib option — extends maximum hook height to 18.46m with fixed hook

Suitable Applications

The URW-506 is the bridge between mid-capacity and heavy mini cranes. Routinely specified for structural glazing on tall atria, plant rooms requiring 3-tonne lifts at extended reach, internal steelwork erection, and architectural lifts where conventional cranes can't deploy. Its working area limitation as standard makes it a default choice on sensitive sites — hospitals, occupied offices, museums and listed buildings.

How to Set Up and Operate the URW-506

1. Survey the working area, verify ground bearing capacity against the published point loadings and confirm overhead clearances are sufficient for the proposed boom geometry.
2. Track the crane into position using the operator's seat or radio remote. Ensure the chassis is on firm, level ground or that load-spreader mats are deployed.
3. Deploy the outriggers to the configuration required by the lift plan — set each outrigger angle and extension, ensuring stabiliser pads make full contact with the ground.
4. Level the crane using the bubble level / auto-level system and verify all outrigger interlocks are engaged before luffing the boom.
5. Configure the rope reeving (1-fall, 2-fall, 4-fall or 5/6-fall as applicable) to match the planned load and required rope length.
6. Set any working area, slew or height limits required by the lift plan via the safe load indicator interface.
7. Carry out a function test, confirm the moment limiter and voice warning system are operational, then lift to working position and complete the lift in accordance with the lift plan.
8. On completion, return the boom to the stow position, retract outriggers and secure the crane for transit or overnight parking.

Warning: Spider cranes must only be operated by CPCS / NPORS / equivalent-certified operators working to an approved lift plan. Never exceed the rated capacity at the relevant radius shown on the load chart. Power source: Diesel + Optional 400V Electric.

Safety Information

• The crane must only be operated by competent, trained and certified operators familiar with this specific UNIC model.
• A documented lift plan, prepared by an Appointed Person, is required for every lifting operation under LOLER 1998.
• Ground conditions must be assessed against the manufacturer's point loadings — supplied on request — before each lift.
• Outriggers must be deployed to a configuration that supports the planned load at the planned radius; mixed-extension configurations require a competent rating check.
• Never operate the crane outside the rated load chart, override the safe load indicator, or carry loads with the boom in an unintended configuration.
• Carry out daily pre-use checks of hooks, wire ropes, hydraulics, safety devices and the moment limiter prior to first lift each shift.

Inspection and Maintenance

Spider cranes must be subject to a Thorough Examination by a Competent Person at least every 12 months under LOLER 1998, with additional 6-month examinations required where the crane is used to lift persons. Daily pre-use checks should cover wire rope condition, hook and shackle integrity, hydraulic system, outrigger pads, tracks, safety devices and the safe load indicator. All WOLFF Onsite hire cranes are supplied with a current Report of Thorough Examination and full service history. Defects identified in service must be reported immediately and the crane taken out of use until repaired.

Frequently Asked Questions