English to Serbian Tech/Engineering Construction / Civil Engineering

1. Cement paste mixing and noise transmission;
2. Dust pollution caused by cement dumping and package opening;
3. Jolt ramming when concrete inserting into stamper;
4. Goods concrete transportation and pump noise;
5. Servicing oil drip in stamper bar and component missing;
6. River pollution caused by concrete falling into river when pouring

Stamper bi trebalo da je drobilica, ali ova stavka 5. nikako mi nije jasna...