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  • 6 years later...

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Hello. The answer to this is 7 years late, sorry; just joined.

Hoist specifications don't detail the weight of the mounting vehicle, which could obviously vary a lot on a larger vehicle.

 

The lifting capacity is relative to the centre of gravity (mounting height dependent) and the theoretical base provided by the outrigger legs. There are other limits:

Say, a 4x4 chassis cab, with mounting subframe weighs 1.7 tons and is plated for 3.5t (including fuel, crew), it could carry  a hoist of, say, 1.3tons. Another factor is the retracted width, which would be limited by Construction and Use regulations. Anyway, let's say a 1.3 ton crane is 2.0m wide, retracted and that is legally compliant(fit silly wide tyres to make the 4x4 wider), you should be able to lift whatever the crane is specified for. 

Look at the Hiab/Palfiner spec sheets; working on the formula GVW - (chassis cab weight + crew + fuel + tools + hydraulic oil) = x kg. Check the retracted width works and pongo, get your wallet out. Just make sure you have pressure pads under the outriggers to spread the load on soft ground.

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