Reilly Concrete Pumping, of Old Premier Stone Yard, Station Road, Sutton, St Helens, admitted breaching Regulation 5(1) of the Provision and Use of Work Equipment Regulations.
It was fined £8,000 with over £1,700 in costs.
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Llandudno Magistrates' Court heard that how the worker was cleaning out the pump following a concrete pour at a construction site on Colwyn Bay promenade on 1 October 2014.
He lifted the interlocked safety grille and sat on the hopper with his feet inside removing the concrete residue.
The safety interlock failed and caused the paddles to start moving, trapping and partially amputating his left foot.
HSE Inspector Chris Wilcox said: "This tragic accident has left the employee suffering life changing injury. Employers are legally required to ensure that work equipment is maintained in a safe condition for use, which in this case was the safety interlock on the hopper grille."
(LM/CD)
